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arXiv · 1708.00984

Localization in One-Dimensional Tight-Binding Model with Chaotic Binary Sequences

Hiroaki S. Yamada
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Abstract

We have numerically investigated localization properties in the one-dimensional tight-binding model with chaotic binary on-site energy sequences generated by a modified Bernoulli map with the stationary-nonstationary chaotic transition (SNCT). The energy sequences in question might be characterized by their correlation parameter $B$ and the potential strength $W$. The quantum states resulting from such sequences have been characterized in the two ways: Lyapunov exponent at band centre and the dynamics of the initially localized wavepacket. Specifically, the $B-$dependence of the relevant Lyapunov exponent's decay is changing from linear to exponential one around the SNCT ($B \simeq 2$). Moreover, here we show that even in the nonstationary regime, mean square displacement (MSD) of the wavepacket is noticeably suppressed in the long-time limit (dynamical localization). The $B-$dependence of the dynamical localization lengths determined by the MSD exhibits a clear change in the functional behaviour around SNCT, and its rapid increase gets much more moderate one for $B \geq 2$. Moreover we show that the localization dynamics for $B>3/2$ deviates from the one-parameter scaling of the localization in the transient region.

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Hiroaki S. Yamada. 2017-12-21. Localization in One-Dimensional Tight-Binding Model with Chaotic Binary Sequences. https://doi.org/10.1016/j.chaos.2018.02.025

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