近日，希腊克里特岛大学物理系的E. N. Economou及其研究团队取得一项新进展。他们揭示了无序晶格中的安德森局域化与跳跃不对称性。相关研究成果已于2024年11月19日在国际知名学术期刊《物理评论A》上发表。

在非厄米光子学的框架下，该研究团队研究了一维Hatano-Nelson晶格中无序性与非厄米性之间的相互作用。在保守的随机系统中，安德森局域化决定了波的传播演化；而当引入非厄米性时，由于存在趋肤模式，光束会被迫单向传播至势场的一侧。

这项研究表明，这两种效应之间的对抗导致了波衍射的定性不同阶段，包括无序强度与波包速度之间关系上的反直觉特性。

附：英文原文

Title: Anderson localization versus hopping asymmetry in a disordered lattice

Author: E. T. Kokkinakis, K. G. Makris, E. N. Economou

Issue&Volume: 2024/11/19

Abstract: In the framework of non-Hermitian photonics, we investigate the interplay between disorder and non-Hermiticity in a one-dimensional Hatano-Nelson lattice. While Anderson localization dictates the wave's evolution in conservative random systems, the introduction of non-Hermiticity tends to force the beam to unidirectionally propagate towards one edge of the potential due to the existence of skin modes. As we show, the antagonism between these effects results in qualitatively distinct phases of wave diffraction, including counterintuitive characteristics regarding the relationship between the strength of disorder and the wave packet's velocity.

DOI: 10.1103/PhysRevA.110.053517

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.053517