Single-Particle Mobility Edge in a One-Dimensional Quasiperiodic Optical Lattice.
Single-Particle Mobility Edge in a One-Dimensional Quasiperiodic Optical Lattice.
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DOI：
10.1103/physrevlett.120.160404
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发表时间：
2017-09
影响因子：
8.6
通讯作者：
H. Lüschen;S. Scherg;Thomas Kohlert;M. Schreiber;P. Bordia;Xiao Li;S. Das Sarma;I. Bloch
中科院分区：
文献类型：
--
作者：
H. Lüschen;S. Scherg;Thomas Kohlert;M. Schreiber;P. Bordia;Xiao Li;S. Das Sarma;I. Bloch
单粒子迁移率边（SPME）标志着量子系统中分离局域态和扩展态的临界能量。在具有不相关无序的一维系统中，SPME不可能存在，因为所有的单粒子态都局限于任意弱的无序强度。然而，在准周期系统中，局域化转变可以发生在一个有限的失谐强度和SPME成为可能。在这封信中，我们发现这样的SPME在一维准周期光学晶格中存在的实验证据。具体来说，我们发现一个政权的扩展和本地化的单粒子状态共存，在良好的协议与理论模拟，预测在这个政权的SPME。
A single-particle mobility edge (SPME) marks a critical energy separating extended from localized states in a quantum system. In one-dimensional systems with uncorrelated disorder, a SPME cannot exist, since all single-particle states localize for arbitrarily weak disorder strengths. However, in a quasiperiodic system, the localization transition can occur at a finite detuning strength and SPMEs become possible. In this Letter, we find experimental evidence for the existence of such a SPME in a one-dimensional quasiperiodic optical lattice. Specifically, we find a regime where extended and localized single-particle states coexist, in good agreement with theoretical simulations, which predict a SPME in this regime.