20
20
Jun 28, 2018
06/18
by
David M. Fobes; Igor A. Zaliznyak; John M. Tranquada; Zhijun Xu; Genda Gu; Xu-Gang He; Wei Ku; Yang Zhao; Masaaki Matsuda; V. Ovidu Garlea; Barry Winn
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eye 20
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Investigation of the inelastic neutron scattering spectra in Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ near a signature wave vector $\mathbf{Q} = (1,0,0)$ for the bond-order wave (BOW) formation of parent compound Fe$_{1+y}$Te [Phys. Rev. Lett. 112, 187202 (2014)] reveals an acoustic-phonon-like dispersion present in all structural phases. While a structural Bragg peak accompanies the mode in the low-temperature phase of Fe$_{1+y}$Te, it is absent in the high-temperature tetragonal phase, where Bragg...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1509.05930
3
3.0
Jun 30, 2018
06/18
by
O. G. Udalov; A. A. Fraerman
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eye 3
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We study a neutron diffraction by A phase of MnSi using a dynamical theory of diffraction and three wave approximation. We show that the neutron diffraction is asymmetrical with respect to an incident plane. The asymmetry depends on a sign of an external magnetic field. This phenomenon can be considered as the Hall effect for neutrons.
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1405.0626
9
9.0
Jun 28, 2018
06/18
by
Yongkang Luo; N. J. Ghimire; E. D. Bauer; J. D. Thompson; F. Ronning
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eye 9
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We report the effect of hydrostatic pressure on the magnetotransport properties of the Weyl semimetal NbAs. Subtle changes can be seen in the $\rho_{xx}(T)$ profiles with pressure up to 2.31 GPa. The Fermi surfaces undergo an anisotropic evolution under pressure: the extremal areas slightly increase in the $\mathbf{k_x}$-$\mathbf{k_y}$ plane, but decrease in the $\mathbf{k_z}$-$\mathbf{k_y}$($\mathbf{k_x}$) plane. The topological features of the two pockets observed at atmospheric pressure,...
Topics: Superconductivity, Materials Science, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1510.08538
11
11
Jun 30, 2018
06/18
by
Lars Bonnes; Fabian H. L. Essler; Andreas M. Läuchli
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eye 11
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Signal propagation in the non equilibirum evolution after quantum quenches has recently attracted much experimental and theoretical interest. A key question arising in this context is what principles, and which of the properties of the quench, determine the characteristic propagation velocity. Here we investigate such issues for a class of quench protocols in one of the central paradigms of interacting many-particle quantum systems, the spin-1/2 Heisenberg XXZ chain. We consider quenches from a...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1404.4062
5
5.0
Jun 30, 2018
06/18
by
Neil J. Robinson; Fabian H. L. Essler; Ivelisse Cabrera; Radu Coldea
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eye 5
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We present experimental and theoretical evidence that an interesting quantum many-body effect -- quasi-particle breakdown -- occurs in the quasi-one-dimensional spin-1/2 Ising-like ferromagnet CoNb$_2$O$_6$ in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symmetry. We propose a quantum spin Hamiltonian capturing the essential one-dimensional physics of CoNb$_2$O$_6$ and determine the exchange parameters of this model by fitting the calculated...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1407.2794
4
4.0
Jun 28, 2018
06/18
by
Zhen Bi; Yi-Zhuang You; Cenke Xu
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eye 4
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In the last few years a lot of exotic and anomalous topological phases were constructed by proliferating the vortex like topological defects on the surface of the $3d$ topological insulator (TI). In this work, rather than considering topological phases at the boundary, we will study quantum critical points driven by vortex like topological defects. In general we will discuss a $(2+1)d$ quantum phase transition described by the following field theory: $\mathcal{L} = \bar{\psi}\gamma_\mu...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1512.01547
18
18
Jun 27, 2018
06/18
by
Hiroaki Ishizuka; Leon Balents
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eye 18
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Direction-dependent anisotropic exchange is a common feature of magnetic systems with strong spin-orbit coupling. Here we study the effect of such exchange upon macroscopic magnetic anisotropy for a face-centered-cubic model. By several theoretical techniques, we show that, both in the paramagnetic and ordered phases, the magnetic anisotropy is induced by fluctuations. Moreover, the magnetic anisotropy differs in the paramagnetic and ordered phases: in the paramagnetic phase the susceptibility...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1504.07607
5
5.0
Jun 30, 2018
06/18
by
Andrzej P. Kądzielawa; Agata Bielas; Marcello Acquarone; Andrzej Biborski; Maciej M. Maśka; Józef Spałek
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The hydrogen molecules $H_2$ and $(H_2)_2$ are analyzed with electronic correlations taken into account between the $1s$ electrons exactly. The optimal single-particle Slater orbitals are evaluated in the correlated state of $H_2$ by combining their variational determination with the diagonalization of the full Hamiltonian in the second-quantization language. All electron--ion coupling constants are determined explicitly and their relative importance is discussed. Sizable zero-point motion...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1405.1577
6
6.0
Jun 30, 2018
06/18
by
Turan Birol; Kristjan Haule
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eye 6
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Discovery of new transition metal compounds with large spin orbit coupling (SOC) coexisting with strong electron-electron correlation among the $d$ electrons is essential for understanding the physics that emerges from the interplay of these two effects. In this study, we predict a novel class of $J_{eff}=1/2$ Mott insulators in a family of fluoride compounds that are previously synthesized, but not characterized extensively. First principles calculations in the level of all electron Density...
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1408.4852
7
7.0
Jun 30, 2018
06/18
by
Koushik Ray; Siddhartha Sen
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eye 7
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We discuss means to study topological properties of wavefunctions in a time reversal invariant crystalline system through $K$-groups. The well-known methods for calculating $K$-groups of $G$-bundles over spheres are extended using earlier results in order to deal with wavefunctions defined over toroidal Brillouin zones, following a method due to Nash. The recently discovered topological insulator is considered as an illustrative example.
Topics: High Energy Physics - Theory, Mathematics, Strongly Correlated Electrons, Mathematical Physics,...
Source: http://arxiv.org/abs/1408.4898
6
6.0
Jun 29, 2018
06/18
by
Michael Kastner
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eye 6
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Long-range interacting many-body systems exhibit a number of peculiar and intriguing properties. One of those is the scaling of relaxation times with the number $N$ of particles in a system. In this paper I give a survey of results on long-range quantum spin models that illustrate this scaling behaviour, and provide indications for its common occurrence by making use of Lieb-Robinson bounds. I argue that these findings may help in understanding the extraordinarily short equilibration timescales...
Topics: Statistical Mechanics, Condensed Matter, Quantum Physics, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1610.03770
13
13
Jun 26, 2018
06/18
by
Hironori Yamaguchi; Yasuhiro Shinpuku; Tokuro Shimokawa; Kenji Iwase; Toshio Ono; Yohei Kono; Shunichiro Kittaka; Toshiro Sakakibara; Yuko Hosokoshi
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eye 13
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We successfully synthesized the zinc-verdazyl complex [Zn(hfac)$_2$]$\cdot$($o$-Py-V) [hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate; $o$-Py-V = 3-(2-pyridyl)-1,5-diphenylverdazyl], which is an ideal model compound with an $S$ = 1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain (F-AF AHC). $Ab$ $initio$ molecular orbital (MO) calculations indicate that two dominant interactions $J_{\rm{F}}$ and $J_{\rm{AF}}$ form the $S=1/2$ F-AF AHC in this compound. The magnetic susceptibility...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1502.06804
5
5.0
Jun 28, 2018
06/18
by
Max A. Metlitski
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eye 5
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Electric-magnetic duality ($S$-duality) is a well-known property of pure $u(1)$ gauge theory in 3+1 dimensions. In this paper, we investigate the compatibility of this duality with time-reversal symmetry. We consider two theories obtained by coupling a Dirac fermion with an "inverted" sign of the mass $m$ to a $u(1)$ gauge field. Time-reversal in the two theories is implemented respectively via the $T$ and $CT$ symmetries of the Dirac fermion. It was recently conjectured (C. Wang and...
Topics: Strongly Correlated Electrons, Condensed Matter, High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.05663
3
3.0
Jun 29, 2018
06/18
by
Ming-Yong Ye; Xiu-Min Lin
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eye 3
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Two-dimensional Hubbard model is very important in condensed matter physics. However it has not been resolved though it has been proposed for more than 50 years. We give several methods to construct eigenstates of the model that are independent of the on-site interaction strength $U$.
Topics: Superconductivity, Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1606.08364
8
8.0
Jun 28, 2018
06/18
by
Taejin Lee
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eye 8
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We study a spin dependent Tomonaga-Luttinger model in one dimension, which describes electron transport through a single barrier. Using the Fermi-Bose equivalence in one dimension, we map the model onto a massless Thirring model with a boundary interaction. A field theoretical perturbation theory for the model has been developed and the chiral symmetry is found to play an important role. The classical bulk action possesses a global $U_A(1)^4$ chiral symmetry, since the fermion fields are...
Topics: Strongly Correlated Electrons, Condensed Matter, High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.01054
3
3.0
Jun 29, 2018
06/18
by
Tai-Kai Ng
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eye 3
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We propose in this paper an effective low-energy theory for interacting fermion systems which supports exclusion statistics. The theory can be viewed as an extension of Landau Fermi liquid theory where besides quasi-particle energy $\xi_{\mathbf{k}}$, the kinetic momentum $\mathbf{k}$ of quasi-particles depends also on quasi-particle occupation numbers as a result of momentum ($k$)-dependent current-current interaction. The dependence of kinetic momentum on quasi-particles excitations leads to...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1610.08633
5
5.0
Jun 30, 2018
06/18
by
Zheng-Xin Liu; Jia-Wei Mei; Peng Ye; Xiao-Gang Wen
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eye 5
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Gutzwiller projection is a way to construct many-body wave functions that could carry topological order or symmetry protected topological (SPT) order. However, an important issue is to determine whether or not a given Gutzwiller-projected wave functions (GWF) carries a non-trivial SPT order, and which SPT order is carried by the wavefunction. In this paper, we numerically study the SPT order in a spin $S = 1$ GWF on the Kagome lattice. Using the standard Monte Carlo method, we directly confirm...
Topics: Quantum Physics, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1408.1676
9
9.0
Jun 29, 2018
06/18
by
Frédéric Bègue; Pierre Pujol; Revaz Ramazashvili
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eye 9
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A two-dimensional topological insulator may arise in a centrosymmetric commensurate N\'{e}el antiferromagnet (AF), where staggered magnetization breaks both the elementary translation and time reversal, but retains their product as a symmetry. Fang et al.[Phys. Rev. B 88, 085406 (2013)] proposed an expression for a $Z_2$ topological invariant to characterize such systems. Here, we show that this expression does not allow to detect all the existing phases if a certain lattice symmetry is...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1605.08291
17
17
Jun 27, 2018
06/18
by
Rok Zitko; Michele Fabrizio
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eye 17
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The infinite dimensional half-filled Hubbard model can be mapped exactly with no additional constraint onto a model of free fermions coupled in a $Z_2$ gauge-invariant manner to auxiliary Ising spins in a transverse field. In this slave-spin representation, the zero-temperature insulator-to-metal transition translates into spontaneous breaking of the local $Z_2$ gauge symmetry, which is not forbidden in infinite dimensions, thus endowing the Mott transition of an order parameter that is...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1504.01521
6
6.0
Jun 30, 2018
06/18
by
Abolhassan Vaezi
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eye 6
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We generalize the Kitaev's spin-1/2 model on the honeycomb by introducing a two-dimensional $Z_3$ clock model on the triangular lattice with three body interaction. We discuss various properties of this model and show that the low energy theory of the $Z_3$ generalized Kitaev model (GKM) is described by a single $Z_3$ parafermion per lattice site coupled to a $Z_3$ gauge field. We also introduce a slave-fermion approach for this GKM, treat the resulting fermionic Hamiltonian at the mean-field...
Topics: Strongly Correlated Electrons, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1405.1721
3
3.0
Jun 30, 2018
06/18
by
K. W. Plumb; J. P. Clancy; L. Sandilands; V. Vijay Shankar; Y. F. Hu; K. S. Burch; Hae-Young Kee; Young-June Kim
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eye 3
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We examine the role of spin-orbit coupling in the electronic structure of $\alpha$-RuCl3, in which Ru ions in 4d5 configuration form a honeycomb lattice. The measured optical spectra exhibit a clear optical gap and excitations within the t2g orbitals. The spectra can be described very well with first-principles electronic structure calculations obtained by taking into account both spin orbit coupling and electron correlations. Furthermore, our X-ray absorption spectroscopy measurements at the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1403.0883
5
5.0
Jun 30, 2018
06/18
by
B. Chakrabarti; M. E. Pezzoli; G. Sordi; K. Haule; G. Kotliar
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eye 5
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The nature of the elemental cerium phases, undergoing an isostructural volume collapse transition, cannot be understood using conventional solid state concepts. Using the combination of density functional theory and dynamical mean-field theory, we study the magnetic properties of both the $\alpha$ and the $\gamma$ phases. We compute the magnetic form factor, and show that it is very close to free ion behavior in both the local moment $\gamma$ phase as well as the more itinerant $\alpha$ phase,...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1401.1245
3
3.0
Jun 30, 2018
06/18
by
C. Repellin; B. Andrei Bernevig; N. Regnault
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eye 3
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We propose a simple microscopic model to numerically investigate the stability of a two dimensional fractional topological insulator (FTI). The simplest example of a FTI consists of two decoupled copies of a Laughlin state with opposite chiralities. We focus on bosons at half filling. We study the stability of the FTI phase upon addition of two coupling terms of different nature: an interspin interaction term, and an inversion symmetry breaking term that couples the copies at the single...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1402.2652
5
5.0
Jun 30, 2018
06/18
by
Diana Prychynenko; Sebastian D. Huber
texts
eye 5
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We calculate the phase diagram of the topological honeycomb model in the presence of strong interactions. We concentrate on half filling and employ a ${\mathbb Z}_{2}$ slave-spin method to find a band insulator with staggered density, a spin-density-wave and a Mott insulating phase. Both the band insulator and the spin-density wave come in various topological varieties. Finally, we calculate the response function relevant for lattice modulation spectroscopy with cold atomic gases in optical...
Topics: Quantum Gases, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1410.2001
13
13
Jun 28, 2018
06/18
by
Kyusung Hwang; Yejin Huh; Yong Baek Kim
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eye 13
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We present an effective $\mathbb{Z}_2$ gauge theory that captures various competing phases in spin-1/2 kagome lattice antiferromagnets: the topological $\mathbb{Z}_2$ spin liquid (SL) phase, and the 12-site and 36-site valence bond solid (VBS) phases. Our effective theory is a generalization of the recent $\mathbb{Z}_2$ gauge theory proposed for SL phases by Wan and Tchernyshyov. In particular, we investigate possible VBS phases that arise from vison condensations in the SL. In addition to the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1507.04747
10
10.0
Jun 29, 2018
06/18
by
M. Gomilsek; M. Klanjsek; M. Pregelj; H. Luetkens; Y. Li; Q. M. Zhang; A. Zorko
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eye 10
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Impurities, which are inherently present in any real material, may play an important role in the magnetism of frustrated spin systems with spin-liquid ground states. We address the impurity issue in quantum kagome antiferromagnets by investigating ZnCu$_3$(OH)$_6$SO$_4$ (Zn-brochantite) by means of muon spin spectroscopy. We show that muons couple to the impurity magnetism, originating from Cu-Zn intersite disorder, and that the impurities are highly correlated with the kagome spins, allowing...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1604.02916
19
19
Jun 26, 2018
06/18
by
V. K. Anand; D. T. Adroja; A. Bhattacharyya; U. B. Paramanik; P. Manuel; A. D. Hillier; D. Khalyavin; Z. Hossain
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Results of muon spin relaxation ($\mu$SR) and neutron powder diffraction measurements on a reentrant superconductor Eu(Fe$_{0.86}$Ir$_{0.14}$)$_2$As$_2$ are presented. Eu(Fe$_{0.86}$Ir$_{0.14}$)$_2$As$_2$ exhibits superconductivity at $T_{\rm c\,on} \approx 22.5$~K competing with long range ordered Eu$^{+2}$ moments below $\approx 18$ K. A reentrant behavior (manifested by nonzero resistivity in the temperature range 10--17.5 K) results from an exquisite competition between the...
Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1502.02886
6
6.0
Jun 30, 2018
06/18
by
A. Bhattacharyya; D. T. Adroja; A. M. Strydom; A. D . Hillier; J. W. Taylor; A. Thamizhavel; S. K. Dhar; W. A. Kockelmann; B. D. Rainford
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eye 6
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The magnetic state of the noncentrosymmetric antiferromagnet CeNiC$_2$ has been studied by magnetic susceptibility, heat capacity, muon spin relaxation ($\mu$SR) and inelastic neutron scattering (INS) measurements. CeNiC$_2$ exhibits three magnetic phase transitions at $T_{N_1}$ = 20 K, $T_{N_2}$ = 10 K and $T_{N_3}$ = 2.5 K. The presence of long range magnetic order below 20 K is confirmed by the observation of oscillations in the $\mu$SR spectra between 10 and 20 K and a sharp increase in the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1403.2859
6
6.0
Jun 29, 2018
06/18
by
Yuesheng Li; Devashibhai Adroja; Pabitra K. Biswas; Peter J. Baker; Qian Zhang; Juanjuan Liu; Alexander A. Tsirlin; Philipp Gegenwart; Qingming Zhang
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eye 6
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Muon spin relaxation and rotation ($\mu$SR) experiments on single crystals of the structurally perfect triangular antiferromagnet YbMgGaO$_4$ indicate the absence of both static long-range magnetic order and spin freezing down to 0.048 K in zero field. Below 0.4 K, the $\mu^{+}$ spin relaxation rates, which are proportional to the dynamic correlation function of the Yb$^{3+}$ spins,exhibit temperature-independent plateaus. Same behavior is revealed by temperature-independent local...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1607.03298
5
5.0
Jun 30, 2018
06/18
by
Sukret Hasdemir; Yang Liu; H. Deng; M. Shayegan; L. N. Pfeiffer; K. W. West; K. W. Baldwin
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eye 5
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Magnetotransport measurements on two-dimensional electrons confined to wide GaAs quantum wells reveal a remarkable evolution of the ground state at filling factor $\nu=1/2$ as we tilt the sample in the magnetic field. Starting with a compressible state at zero tilt angle, a strong $\nu=1/2$ fractional quantum Hall state appears at intermediate angles. At higher angles an insulating phase surrounds this state and eventually engulfs it at the highest angles. This evolution occurs because the...
Topics: Mesoscale and Nanoscale Physics, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1410.5874
4
4.0
Jun 29, 2018
06/18
by
Haizhao Zhi; Takashi Imai; Zhangtu Tang; Yi Liu; Guanghan Cao
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eye 4
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We report $^{133}$Cs NMR and $^{75}$As Nuclear Quadrupole Resonance (NQR) measurements on the normal metallic state above $T_c$ of a quasi-one-dimensional superconductor Cs$_2$Cr$_3$As$_3$ ($T_c < 1.6$~K). From the $^{133}$Cs NMR Knight shift $^{133}K$ measured at the Cs1 site, we show that the uniform spin susceptibility $\chi_{spin}$ increases from 295~K to $\sim$ 60~K, followed by a mild suppression; $\chi_{spin}$ then levels off below $\sim$10~K. In contrast, a vanishingly small...
Topics: Superconductivity, Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1605.04347
4
4.0
Jun 30, 2018
06/18
by
T. Tzen Ong; Piers Coleman
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eye 4
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We show that when spin and orbital angular momenta are entangled by spin-orbit coupling, this transforms a topological spin-triplet superfluid/superconductor state, such as $^{3}$He-B, into a topological $s^{\pm}$ state, with non-trivial gapless edge states. Similar to $^{3}$He-B, the $s^{\pm}$ state also minimizes on-site Coulomb repulsion for weak to moderate interactions. A topological phase transition into a $d$-wave state occurs for sufficiently strong spin-orbit coupling.
Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1402.7372
5
5.0
Jun 30, 2018
06/18
by
Imam Makhfudz
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eye 5
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In this paper, we show that the theory of high $T_c$ superconductivity based on a microscopic model with $d$-density wave (DDW) scenario in the pseudogap phase is able to reproduce some of the most important features of the recent experimentally discovered hidden charge order in several families of Cuprates. In particular, by computing and comparing energies of charge orders of different modulation directions derived from a full microscopic theory with $d$-density wave scenario, the axial...
Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1406.3585
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16
Jun 28, 2018
06/18
by
Hiroyuki Yamase; Matías Bejas; Andrés Greco
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eye 16
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We study charge excitation spectra in the two-dimensional $t$-$J$ model on a square lattice to explore a charge-order tendency recently found in electron-doped cuprates around the carrier density 0.15. The static susceptibility of $d$-wave charge density, which corresponds to the nematic susceptibility at the momentum transfer ${\bf q}=(0,0)$, shows two characteristic peaks at momenta of the form ${\bf q}_{1}=(q',q')$ and ${\bf q}_{2}=(q,0)$. These two peaks originate from the so-called...
Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1506.06853
15
15
Jun 26, 2018
06/18
by
J. P. L. Faye; S. R. Hassan; P. V. Sriluckshmy; G. Baskaran; D. Sénéchal
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eye 15
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We study the one-band Hubbard model on the trellis lattice, a two-dimensional frustrated lattice of coupled two-leg ladders, with hopping amplitude $t$ within ladders and $t'$ between ladders. For large $U/t$ this is a model for the cuprate Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$. We investigate the phase diagram as a function of doping for $U=10t$ using two quantum cluster methods: The variational cluster approximation (VCA), with clusters of sizes 8 and 12, and Cellular dynamical mean field theory...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1502.06050
7
7.0
Jun 30, 2018
06/18
by
Li Huang; Yilin Wang; Zi Yang Meng; Liang Du; Philipp Werner; Xi Dai
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eye 7
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Quantum impurity solvers have a broad range of applications in theoretical studies of strongly correlated electron systems. Especially, they play a key role in dynamical mean-field theory calculations of correlated lattice models and realistic materials. Therefore, the development and implementation of efficient quantum impurity solvers is an important task. In this paper, we present an open source interacting quantum impurity solver toolkit (dubbed $i$QIST). This package contains several...
Topics: Physics, Strongly Correlated Electrons, Computational Physics, Condensed Matter
Source: http://arxiv.org/abs/1409.7573
10
10.0
Jun 28, 2018
06/18
by
Masahisa Tsuchiizu; Youichi Yamakawa; Hiroshi Kontani
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eye 10
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The discovery of the charge-density-wave formation in the high-$T_c$ cuprate superconductors has activated intensive theoretical studies for the pseudogap states. However, the microscopic origin of the charge-density-wave state has been unknown so far since the many-body effects beyond the mean-field-level approximations, called the vertex corrections, are essential. Toward solving this problem, we employ the recently developed functional renormalization-group method, by which we can calculate...
Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1508.07218
5
5.0
Jun 30, 2018
06/18
by
Axel Cortés Cubero
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eye 5
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We study Yang Mills theory in 2+1 dimensions, as an array of coupled (1+1)-dimensional principal chiral sigma models. This can be understood as an anisotropic limit where one of the space-time dimensions is discrete and the others are continuous. The $SU(N)\times SU(N)$ principal chiral sigma model in 1+1 dimensions is integrable, asymptotically free and has massive excitations. New exact form factors and correlation functions of the sigma model have recently been found by the author and P....
Topics: High Energy Physics - Theory, Nonlinear Sciences, Strongly Correlated Electrons, Exactly Solvable...
Source: http://arxiv.org/abs/1405.7639
4
4.0
Jun 29, 2018
06/18
by
Peng Ye
texts
eye 4
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In (3+1)D twisted gauge theories, global symmetry may be imposed on topological currents $\star\frac{1}{2\pi}db^I$ in a hydrodynamical way ($I=1,2,\cdots$, $\{b^I\}$ is a set of Kalb-Ramond gauge fields). This methodology has been applied before in the Chern-Simons theory of fractional quantum Hall liquids. We find that, in some twisted gauge theories (with discrete Abelian gauge group $G_g$), implementing a global symmetry (denoted by $G_s$) is always inconsistent. There are two consequences....
Topics: Mathematics, High Energy Physics - Theory, Mathematical Physics, Condensed Matter, Strongly...
Source: http://arxiv.org/abs/1610.08645
4
4.0
Jun 30, 2018
06/18
by
Yoshiyuki Tatsuta; Akio Tomiya
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eye 4
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We provide an origin of family replications in the standard model of particle physics by constructing renormalizable, asymptotically free, four dimensional local gauge theories that dynamically generate the fifth and sixth dimensions with magnetic fluxes.
Topics: High Energy Physics - Theory, Strongly Correlated Electrons, Condensed Matter, High Energy Physics...
Source: http://arxiv.org/abs/1703.05263
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5.0
Jun 30, 2018
06/18
by
Bo Feng; Defu Hou; Hai-cang Ren
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The Bose-Einstein condensation of bound pairs made of oppositely charged fermions in a magnetic field is investigated. We find that the condensation temperature shows the magnetic catalysis effect in weak coupling and the inverse magnetic catalysis effect in strong coupling. The different responses to the magnetic field can be attributed to the competition between the dimensional reduction by Landau orbitals in pairing dynamics and the anisotropy of the kinetic spectrum of fluctuations (bound...
Topics: Quantum Gases, High Energy Physics - Phenomenology, Strongly Correlated Electrons, Nuclear Theory,...
Source: http://arxiv.org/abs/1412.1647
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7.0
Jun 30, 2018
06/18
by
Yakui Weng; Jun-Jie Zhang; Bin Gao; Shuai Dong
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At interfaces between oxide materials, lattice and electronic reconstructions always play important roles in exotic phenomena. In this study, the density functional theory and maximally localized Wannier functions are employed to investigate the (LaTiO$_3$)$_n$/(LaVO$_3$)$_n$ magnetic superlattices. The electron transfer from Ti$^{3+}$ to V$^{3+}$ is predicted, which violates the intuitive band alignment based on the electronic structures of LaTiO$_3$ and LaVO$_3$. Such unconventional charge...
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter, Mesoscale and Nanoscale Physics
Source: http://arxiv.org/abs/1703.10748
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4.0
Jun 30, 2018
06/18
by
Huiyuan Man; Chuan Qin; Cui Ding; Quan Wang; Xin Gong; Shengli Guo; Hangdong Wang; Bin Chen; F. L. Ning
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A new diluted magnetic semiconductor system, (Sr3La2O5)(Zn1-xMnx)2As2, has been synthesized and characterized. 10% Mn substitution for Zn in bulk form (Sr3La2O5)Zn2As2 results in a ferromagnetic ordering below Curie temperature, TC ~ 40 K. (Sr3La2O5)(Zn1-xMnx)2As2 has a layered crystal structure identical to that of 32522-type Fe based superconductors, and represents the fifth DMS family that has a direct counterpart among the FeAs high temperature superconductor families.
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1403.3483
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8.0
Jun 29, 2018
06/18
by
C. W. von Keyserlingk; S. L. Sondhi
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Recent work suggests that a sharp definition of `phase of matter' can be given for periodically driven `Floquet' quantum systems exhibiting many-body localization. In this work we propose a classification of the phases of interacting Floquet localized systems with (completely) spontaneously broken symmetries -- we focus on the one dimensional case, but our results appear to generalize to higher dimensions. We find that the different Floquet phases correspond to elements of $Z(G)$, the centre of...
Topics: Disordered Systems and Neural Networks, Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1602.06949
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4.0
Jun 28, 2018
06/18
by
Adam Iaizzi; Anders W. Sandvik
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A Valence bond solid (VBS) is a nonmagnetic, long-range ordered state of a quantum spin system where local spin singlets are formed in some regular pattern. We here study the competition between VBS order and a fully polarized ferromagnetic state as function of an external magnetic field in a one-dimensional extended Heisenberg model---the J-Q$_2$ model---using stochastic series expansion quantum Monte Carlo simulations with directed loop updates. We discuss the ground state phase diagram.
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1510.07680
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7.0
Jun 29, 2018
06/18
by
K. R. Shirer; A. P. Dioguardi; B. T. Bush; J. Crocker; C. H. Lin; P. Klavins; J. C. Cooley; M. B. Maple; K. B. Chang; K. R. Poeppelmeier; N. J. Curro
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We report 29Si nuclear magnetic resonance measurements of single crystals and aligned powders of URu2Si2 under pressure in the hidden order and paramagnetic phases. We find that the Knight shift decreases with applied pressure, consistent with previous measurements of the static magnetic susceptibility. Previous measurements of the spin lattice relaxation time revealed a partial suppression of the density of states below 30 K. This suppression persists under pressure, and the onset temperature...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1601.02052
5
5.0
Jun 30, 2018
06/18
by
Yichen Huang
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We show that the 2D local Hamiltonian problem with the restriction that the ground state satisfies area laws is QMA-complete. We also prove similar results in 2D translationally invariant systems and for the 3D Heisenberg and Hubbard models. Consequently, in general the ground states of local Hamiltonians satisfying area laws do not have efficient classical representations that support efficient computation of local expectation values unless QMA=NP. Conceptually, even if in the future area laws...
Topics: Quantum Physics, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1411.6614
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4.0
Jun 30, 2018
06/18
by
R. C. Brown; R. Wyllie; S. B. Koller; E. A. Goldschmidt; M. Foss-Feig; J. V. Porto
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The competition of magnetic exchange interactions and tunneling underlies many complex quantum phenomena observed in real materials. We study non-equilibrium magnetization dynamics in an extended 2D system by loading effective spin-1/2 bosons into a spin-dependent optical lattice, and we use the lattice to separately control the resonance conditions for tunneling and superexchange. After preparing a non-equilibrium anti-ferromagnetically ordered state, we observe relaxation dynamics governed by...
Topics: Physics, Quantum Physics, Strongly Correlated Electrons, Quantum Gases, Atomic Physics, Condensed...
Source: http://arxiv.org/abs/1411.7036
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5.0
Jun 29, 2018
06/18
by
Emmanouil Frantzeskakis; Tobias Chris Rödel; Franck Fortuna; Andrés Felipe Santander-Syro
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The scope of this article is to review the state-of-the-art in the field of confined electron systems generated at the bare surfaces of transition metal oxides (TMOs). This scientific field is a prime example of a domain where two-dimensional physics and photoemission-based spectroscopic techniques have together set up the development of the story. The discovery of a high-mobility two-dimensional electron system (2DES) at interfaces of transition metal oxides has attracted an immense scientific...
Topics: Materials Science, Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1610.03221
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15
Jun 30, 2018
06/18
by
Takafumi Kita
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We construct a variational wave function for the ground state of weakly interacting bosons that gives a lower energy than the mean-field Girardeau-Arnowitt (or Hartree-Fock-Bogoliubov) theory. This improvement is brought about by incorporating the dynamical 3/2-body processes where one of two colliding non-condensed particles drops into the condensate and vice versa. The processes are also shown to transform the one-particle excitation spectrum into a bubbling mode with a finite lifetime even...
Topics: Strongly Correlated Electrons, Quantum Gases, Condensed Matter, Statistical Mechanics,...
Source: http://arxiv.org/abs/1703.04760
