Disorder-Induced Localization in a Strongly Correlated Atomic Hubbard Gas

被引：235
作者：
Kondov, S. S. [1 ]
McGehee, W. R. [1 ]
Xu, W. [1 ]
DeMarco, B. [1 ]
机构：
[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
来源：
PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 08期
基金：
美国国家科学基金会;
关键词：
METAL-INSULATOR-TRANSITION; OPTICAL LATTICE; ELECTRONIC SYSTEMS; ULTRACOLD ATOMS; FERMIONS; STATES;
D O I：
10.1103/PhysRevLett.114.083002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We observe the emergence of a disorder-induced insulating state in a strongly interacting atomic Fermi gas trapped in an optical lattice. This closed quantum system, free of a thermal reservoir, realizes the disordered Fermi-Hubbard model, which is a minimal model for strongly correlated electronic solids. We observe disorder-induced localization of a metallic state through measurements of mass transport. By varying the lattice potential depth, we detect interaction-driven delocalization of the disordered insulating state. We also measure localization that persists as the temperature of the gas is raised. These behaviors are consistent with many-body localization, which is a novel paradigm for understanding localization in interacting quantum systems at nonzero temperature.
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页数：5
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