Upreti Lavi K, Evain C, Randoux S, Suret P, Amo A, Delplace P
Université Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France.
Université Lille, CNRS, UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, F-59000 Lille, France.
Phys Rev Lett. 2020 Oct 30;125(18):186804. doi: 10.1103/PhysRevLett.125.186804.
We report new oscillations of wave packets in quantum walks subjected to electric fields, that decorate the usual Bloch-Zener oscillations of insulators. The number of turning points (or suboscillations) within one Bloch period of these oscillations is found to be governed by the winding of the quasienergy spectrum. Thus, this provides a new physical manifestation of a topological property of periodically driven systems that can be probed experimentally. Our model, based on an oriented scattering network, is readily implementable in photonic and cold atomic setups.
我们报告了在受到电场作用的量子行走中波包的新振荡，这些振荡修饰了绝缘体通常的布洛赫 - 齐纳振荡。发现在这些振荡的一个布洛赫周期内转折点（或子振荡）的数量由准能谱的缠绕决定。因此，这为周期性驱动系统的拓扑性质提供了一种新的物理表现形式，且该性质可通过实验进行探测。我们基于定向散射网络的模型，在光子和冷原子装置中易于实现。
