利用时间调制随机在位势研究光晶格中的粒子-空穴对称局域化
Particle-hole symmetric localization in optical lattices using time modulated random on-site potentials
摘要：
由于粒子-空穴的对称性，随机跳跃模型表现出许多有趣的特性，如随着能量接近带心，局域化长度和态密度发散。然而，这样的模型还有待实验实现，因为粒子-空穴对称性很容易被对角无序破坏。本文提出了在特定频率范围内通过调制无序的原位势可以有效地在超冷原子中实现纯随机跳跃模型。这个想法是由最近发展的现象称为“动态本地化”或“相干破坏隧道”的动机。考察这一思想在一维中的应用，我们发现，如果无序势的振荡频率从零逐渐增加到无穷大，可以将一个非相互作用系统从Anderson绝缘体调谐到带中心局域长度发散的随机跳跃模型，并最终调谐到均匀跳跃紧束缚模型.
英文摘要：
The random hopping models exhibit many fascinating features, such as diverging localization length and density of states as energy approaches the bandcenter, due to its particle-hole symmetry. Nevertheless, such models are yet to be realized experimentally because the particle-hole symmetry is easily destroyed by diagonal disorder. Here we propose that a pure random hopping model can be effectively realized in ultracold atoms by modulating a disordered onsite potential in particular frequency ranges. This idea is motivated by the recent development of the phenomena called "dynamical localization" or "coherent destruction of tunneling". Investigating the application of this idea in one dimension, we find that if the oscillation frequency of the disorder potential is gradually increased from zero to infinity, one can tune a non-interacting system from an Anderson insulator to a random hopping model with diverging localization length at the band center, and eventually to a uniform-hopping tight-binding model.
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