当前位置:科学网首页 > 小柯机器人 >详情
二维陈绝缘子和三维手性拓扑绝缘子任意淬灭过程中的非绝热动力学表征
作者:小柯机器人 发布时间:2023/6/2 11:11:16

近日,湖南大学的李福祥课题组取得一项新进展。经过不懈努力,他们实现了二维陈绝缘子和三维手性拓扑绝缘子任意淬灭过程中的非绝热动力学表征。相关研究成果已于2023年5月30日在国际知名学术期刊《物理评论A》上发表。

该研究团队对非绝热慢淬灭动力学下的不同类型淬灭过程进行了全面研究。除了研究非平凡相与平凡相之间的过程,他们还探索了具有不同拓扑不变量的相之间的过渡过程。研究发现,在慢淬灭动力学下,能够同时表征初始和最终的拓扑相,并且通过时间平均自旋极化来捕捉拓扑不变量。此外,不同类型的过程可以通过时间平均自旋极化消失的特殊区域来区分。

这些发现不仅适用于二维陈绝缘体,也适用于三维手征拓扑绝缘体。所有的动力学表征方案都基于实验可测量的量——时间平均自旋极化,因此可以为未来的实验提供参考。

据悉,最近,通过非绝热的突然淬灭动力学,成功实现了对体积拓扑的动力学表征。然而,研究表明,在系统从初始的拓扑平凡相进行淬灭时,只能表征最终相的拓扑性质。

附:英文原文

Title: Nonadiabatic dynamical characterization in arbitrary quenching processes of two-dimensional Chern insulators and three-dimensional chiral topological insulators

Author: Panpan Fang, Xinwei Shi, Yi-Xiang Wang, Fuxiang Li

Issue&Volume: 2023/05/30

Abstract: Recently, dynamical characterization of bulk topology has been experimentally realized under nonadiabatic sudden quench dynamics. However, it has been shown that only the topology of final phase can be characterized when the system is quenched from initial topologically trivial phase. In this paper, we make a thorough investigation of different types of quenching processes under nonadiabatic slow quench dynamics, and study not only the processes between nontrivial phase and trivial phase, but also between the phases with different topological invariants. We find that, under slow quench dynamics, both the initial and final topological phase can be characterized and the topological invariant can be captured by time-averaged spin polarization. Moreover, different types of processes can be distinguished from the special regions where the time-averaged spin polarization vanishes. Our findings are not only restricted to two-dimensional Chern insulators, but also are valid for three-dimensional chiral topological insulators. All the dynamical characterization schemes are entirely based on the experimentally measurable quantity time-averaged spin polarization, and thus one can expect our findings may provide reference for future experiments.

DOI: 10.1103/PhysRevA.107.052218

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.052218

期刊信息

Physical Review A:《物理评论A》,创刊于1970年。隶属于美国物理学会,最新IF:2.97
官方网址:https://journals.aps.org/pra/
投稿链接:https://authors.aps.org/Submissions/login/new