Mean-field dynamics to negative absolute temperatures in the Bose-Hubbard model

Mean-field dynamics to negative absolute temperatures in the Bose-Hubbard model
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Bose-Hubbard 模型中负绝对温度的平均场动力学

DOI:
10.1103/physreva.87.043611
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发表时间:
2012
期刊:
影响因子:
2.9
通讯作者:
Ákos Rapp
Ákos Rapp
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ákos Rapp

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我们应用含时的Gutzwiller平均场理论提供了一个定性的理解玻色子在光学晶格中的方法对应于负绝对温度的状态。我们进行了动力学模拟与最近的实验Braun等人[ S。Braun,J. P. Ronaldo,M. Schreiber,S. S. Hodgman,T.罗姆岛Bloch和U. Schneider,Science 339 52(2013)]。从二维数值模拟计算的飞行时间图像再现实验观察的特征,特别是在布里渊区的角落处出现的四个峰。
We apply time-dependent Gutzwiller mean-field theory to provide a qualitative understanding for bosons in optical lattices that approach states corresponding to negative absolute temperatures. We perform the dynamical simulations to relate to the recent experiments by Braun et al. [ S. Braun, J. P. Ronzheimer, M. Schreiber, S. S. Hodgman, T. Rom, I. Bloch and U. Schneider, Science 339 52 (2013)]. Time-of-flight images calculated from the two-dimensional numerical simulations reproduce characteristics of the experimental observations, in particular, the emergence of the four peaks at the corners of the Brillouin zone.