arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.02453cond-mat.quant-gas
收藏

用周期性调制的相互作用控制无序

Controlling disorder with periodically modulated interactions

Arkadiusz Kosior, Jan Major, Marcin Płodzień, Jakub Zakrzewski

摘要:

从一个新的角度研究了一维紧束缚模型中无序导致安德森局域化的著名问题。一个二元无序被认为是由不动的重粒子的运动,较轻的,移动的物种在移动粒子之间没有相互作用的限制。种间相互作用的快速周期性调制使我们能够产生一个有效的模型,具有冷原子实验中未探索的小对角和大非对角无序。给出了近似的安德森局域化长度的表达式,验证了扩展共振模的存在性,并分析了非零次近邻跳跃项的影响.我们指出,相互作用的周期性调制允许无序作为一个可调谐的带通滤波器的动量。

英文摘要:

We investigate a celebrated problem of one dimensional tight binding model in the presence of disorder leading to Anderson localization from a novel perspective. A binary disorder is assumed to be created by immobile heavy particles for the motion of the lighter, mobile species in the limit of no interaction between mobile particles. Fast periodic modulations of interspecies interactions allow us to produce an effective model with small diagonal and large off-diagonal disorder unexplored in cold atoms experiments. We present an expression for an approximate Anderson localization length and verify the existence of the well known extended resonant mode and analyze the influence of nonzero next-nearest neighbor hopping terms. We point out that periodic modulation of interaction allow disorder to work as a tunable band-pass filter for momenta.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑