Equation of State of the Two-Dimensional Hubbard Model.
Equation of State of the Two-Dimensional Hubbard Model.
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DOI：
10.1103/physrevlett.116.175301
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发表时间：
2015-12
影响因子：
8.6
通讯作者：
E. Cocchi;L. Miller;J. Drewes;M. Koschorreck;D. Pertot;F. Brennecke;M. Köhl
中科院分区：
文献类型：
--
作者：
E. Cocchi;L. Miller;J. Drewes;M. Koschorreck;D. Pertot;F. Brennecke;M. Köhl
动能、相互作用和维度之间的微妙相互作用挑战了我们对强相关物理学的理解，例如在固态中观察到的。在这一探索中，哈伯德模型已经成为一个概念简单，但描述这种物理的丰富模型。本文利用光学晶格中超冷费米子原子的高分辨成像技术，在很宽的相互作用范围（0 ~ 20 μ U/t ~ 20）和温度范围（B ~ T/t=0.63（2））内，对排斥性二维Hubbard模型的物态方程进行了实验测定。我们显示了密度分布，压缩，和双occupational在整个掺杂范围内，因此，我们的研究结果构成了国家的最先进的理论方法的基准。
The subtle interplay between kinetic energy, interactions, and dimensionality challenges our comprehension of strongly correlated physics observed, for example, in the solid state. In this quest, the Hubbard model has emerged as a conceptually simple, yet rich model describing such physics. Here we present an experimental determination of the equation of state of the repulsive two-dimensional Hubbard model over a broad range of interactions 0≲U/t≲20 and temperatures, down to k_{B}T/t=0.63(2) using high-resolution imaging of ultracold fermionic atoms in optical lattices. We show density profiles, compressibilities, and double occupancies over the whole doping range, and, hence, our results constitute benchmarks for state-of-the-art theoretical approaches.