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Controlling symmetry and localization with an artificial gauge field in a disordered quantum system
2017-10-24  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

 Chinese Academy of Sciences

Seminar

Title

题目

Controlling symmetry and localization with an artificial gauge field in a disordered quantum system

Speaker

报告人

Professor Radu Chicireanu

Affiliation

所在单位

Université de Lille 1, France

Date

日期

2017年10月24日(周二)下午3:30

Venue

地点

Room 322, ITP

Abstract

摘要

Anderson localization, the absence of diffusion in disordered media, draws its origins from the destructive interference between multiple scattering paths. The localization properties of disordered systems are expected to be dramatically sensitive to their symmetry characteristics. So far however, this question has been little explored experimentally. Here, we investigate the realization of an artificial gauge field in a synthetic (temporal) dimension of a disordered, periodically-driven (Floquet) quantum system. Tuning the strength of this gauge field allows us to control the time-reversal symmetry properties of the system, which we probe through the experimental observation of three symmetry-sensitive ‘smoking-gun’ signatures of localization. The first two are the coherent backscattering, marker of weak localization, and the coherent forward scattering, genuine interferential signature of Anderson localization, observed here for the first time. The third is the direct measurement of the \beta(g) scaling function in two different symmetry classes, allowing to demonstrate its universality and the one-parameter scaling hypothesis.

Contact person

所内联系人

田矗舜
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