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3.0
Jun 30, 2018
06/18
by
E. Nicklas; W. Muessel; H. Strobel; P. G. Kevrekidis; M. K. Oberthaler
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The dynamical evolution of spatial patterns in a complex system can reveal the underlying structure and stability of stationary states. As a model system we employ a two-component rubidium Bose-Einstein condensate at the transition from miscible to immiscible with the additional control of linear interconversion. Excellent agreement is found between the detailed experimental time evolution and the corresponding numerical mean-field computations. Analyzing the dynamics of the system, we find...
Topics: Quantum Gases, Nonlinear Sciences, Pattern Formation and Solitons, Condensed Matter
Source: http://arxiv.org/abs/1407.8049
5
5.0
Jun 30, 2018
06/18
by
Huy Nguyen; Hao Shi; Jie Xu; Shiwei Zhang
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We describe CPMC-Lab, a Matlab program for the constrained-path and phaseless auxiliary-field Monte Carlo methods. These methods have allowed applications ranging from the study of strongly correlated models, such as the Hubbard model, to ab initio calculations in molecules and solids. The present package implements the full ground-state constrained-path Monte Carlo (CPMC) method in Matlab with a graphical interface, using the Hubbard model as an example. The package can perform calculations in...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1407.7967
4
4.0
Jun 30, 2018
06/18
by
Jige Chen; Yi Gao; Chunlei Wang; Renliang Zhang; Hong Zhao; Haiping Fang
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Thermally driven nanotube nanomotors provide linear mass transportation controlled by a temperature gradient. However, the underlying mechanism is still unclear where the mass transportation velocity in experiment is much lower than that resulting from simulations. Considering that defects are common in fabricated nanotubes, we use molecular dynamics simulations to show that the mass transportation would be considerably impeded by the potential barriers or wells induced by the defects, which...
Topics: Mesoscale and Nanoscale Physics, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1407.8263
60
60
Jun 30, 2018
06/18
by
Yuancheng Fan; Fuli Zhang; Qian Zhao; Zeyong Wei; Hongqiang Li
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Coherent perfect absorber (CPA) was proposed as the time-reversed counterpart to laser: a resonator containing lossy medium instead of gain medium can absorb the coherent optical fields completely. Here, we exploit a monolayer graphene to realize the CPA in a non-resonant manner. It is found that quasi-CPA point exists in the terahertz regime for suspending monolayer graphene, and the CPA can be implemented with the assistant of proper phase modulation among two incident beams at the quasi-CPA...
Topics: Physics, Mesoscale and Nanoscale Physics, Optics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1407.7961
21
21
Jun 30, 2018
06/18
by
Zenan Qi; Harold S. Park; David K. Campbell
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Graphene's exceptional mechanical properties, including its highest-known stiffness (1 TPa) and strength (100 GPa) have been exploited for various structural applications. However, graphene is also known to be quite brittle, with experimentally-measured tensile fracture strains that do not exceed a few percent. In this work, we introduce the notion of graphene kirigami, where concepts that have been used almost exclusively for macroscale structures are applied to dramatically enhance the...
Topics: Physics, Computational Physics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1407.8113
