arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1808.03585cond-mat.dis-nncond-mat.quant-gascond-mat.stat-mech
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具有幂律跳跃的一维准晶

One-dimensional quasicrystals with power-law hopping

X. Deng, S. Ray, S. Sinha, G. V. Shlyapnikov, L. Santos

摘要:

一维准周期幂律跳变系统($1/r^a$)既不同于标准Aubry-Azbel-Harper(AAH)模型,也不同于具有不相关无序的幂律系统.而在AAH模型中,所有的单粒子状态都经历了从遍历到临界准无序强度的局部化的转变,具有$a>1$的短程幂律跳跃可以导致迁移率边缘。有趣的是,与不相关疾病的情况相反,$a\leq 1$的长程跳跃没有定位。具有长程跳变的系统的特征在于遍历到多重分形边缘和从遍历到多重分形(扩展但非遍历)状态的相变。我们表明,流动性和遍历多重分形边缘可以清楚地显示在实验中的膨胀动力学。

英文摘要:

One-dimensional quasi-periodic systems with power-law hopping, $1/r^a$, differ from both the standard Aubry-Azbel-Harper (AAH) model and from power-law systems with uncorrelated disorder. Whereas in the AAH model all single-particle states undergo a transition from ergodic to localized at a critical quasi-disorder strength, short-range power-law hops with $a>1$ can result in mobility edges. Interestingly, there is no localization for long-range hops with $a\leq 1$, in contrast to the case of uncorrelated disorder. Systems with long-range hops are rather characterized by ergodic-to-multifractal edges and a phase transition from ergodic to multifractal (extended but non ergodic) states. We show that both mobility and ergodic-to-multifractal edges may be clearly revealed in experiments on expansion dynamics.

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