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3.0

Jun 30, 2018
06/18

by
Kyle B. Hollingshead; Thomas M. Truskett

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We use molecular dynamics simulations to test integral equation theory predictions for the structure of fluids of spherical particles with eight different piecewise-constant pair interaction forms comprising a hard core and a combination of two shoulders and/or wells. Since model pair potentials like these are of interest for discretized or coarse-grained representations of effective interactions in complex fluids (e.g., for computationally intensive inverse optimization problems), we focus...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.8060

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9.0

Jun 30, 2018
06/18

by
Manpreet Singh; Tapan Mishra; Ramesh V. Pai; B. P. Das

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We obtain the complete quantum phase diagram of bosons on a two-leg ladder in the presence of attractive onsite and repulsive interchain nearest-neighbor interactions by imposing the onsite three-body constraint. We find three distinct phases; namely, the atomic superfluid (ASF), dimer superfluid (DSF), and the dimer rung insulator (DRI). In the absence of the interchain nearest-neighbor repulsion, the system exhibits a transition from the ASF to the DSF phase with increasing onsite attraction....

Topics: Quantum Gases, Condensed Matter

Source: http://arxiv.org/abs/1407.7950

3
3.0

Jun 30, 2018
06/18

by
T. Konno; T. Adachi; M. Imaizumi; T. Noji; T. Kawamata; Y. Koike

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In order to investigate details of the superconducting (SC) gap in the iron-chalcogenide superconductors, the specific heat, C, of FeSe_1-x_Te_x_ with x=0.6-1 has been measured in magnetic fields. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field, resulting in the increase of the slope of the C/T vs T^2^ plot at low temperatures. From the specific-heat measurements at very low temperatures down to 0.4 K, it has...

Topics: Superconductivity, Condensed Matter

Source: http://arxiv.org/abs/1407.8266

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4.0

Jun 30, 2018
06/18

by
Taras Verkholyak; Jozef Strecka; Frederic Mila; Kai P. Schmidt

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Exact ground states of a spin-1/2 Ising-Heisenberg model on the Shastry-Sutherland lattice with Heisenberg intra-dimer and Ising inter-dimer couplings are found by two independent rigorous procedures. The first method uses a unitary transformation to establish a mapping correspondence with an effective classical spin model, while the second method relies on the derivation of an effective hard-core boson model by continuous unitary transformations. Both methods lead to equivalent effective...

Topics: Statistical Mechanics, Condensed Matter

Source: http://arxiv.org/abs/1407.8229