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Quantum annealing and nonequilibrium dynamics of Floquet Chern insulators

机译:Floquet Chern绝缘子的量子退火和非平衡动力学。

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摘要

Inducing topological transitions by a time-periodic perturbation offers a route to controlling the properties of materials. Here, we show that the adiabatic preparation of a nontrivial state involves a selective population of edge states, due to exponentially small gaps preventing adiabaticity. We illustrate this by studying graphenelike ribbons with hopping's phases of slowly increasing amplitude, as, e.g., for a circularly polarized laser slowly turned on. The induced currents have large periodic oscillations, but flow solely at the edges upon time averaging, and can be controlled by focusing the laser on either edge. The bulk undergoes a nonequilibrium topological transition, as signaled by a local Hall conductivity, the Chern marker introduced by Bianco and Resta in equilibrium. The breakdown of this adiabatic picture in the presence of intraband resonances is discussed.
机译:通过时间周期扰动诱发拓扑转变,为控制材料的特性提供了一条途径。在这里,我们显示非平凡状态的绝热准备涉及边缘状态的选择性填充,这是由于防止绝热的指数小间隙所致。我们通过研究振幅逐渐增加的跳变相位的类石墨烯带来说明这一点,例如,对于缓慢开启的圆偏振激光。感应电流具有较大的周期性振荡,但在时间平均时仅在边缘流动,并且可以通过将激光聚焦在任一边缘上进行控制。主体经历了局部霍尔电导率,Bianco和Resta引入了处于平衡状态的Chern标记,表明该主体经历了非平衡拓扑转变。讨论了在带内共振情况下该绝热图像的分解。

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  • 来源
    《Physical review》 |2016年第24期|241406.1-241406.5|共5页
  • 作者单位

    SISSA, Via Bonomea 265, 1-34136 Trieste, Italy;

    SISSA, Via Bonomea 265, 1-34136 Trieste, Italy,CNR-IOM Democritos National Simulation Center, Via Bonomea 265,1-34136 Trieste, Italy,International Centre for Theoretical Physics (ICTP), P.O. Box 586, 1-34014 Trieste, Italx;

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