首 页机构概况机构设置科研人才队伍合作交流研究生教育博士后图书馆创新文化党群园地院重点实验室彭桓武中心信息公开
  学术活动
  您现在的位置:首页 > 学术活动 > 专题学术报告/Seminar
(Seminar)Chaotic Scattering in Quantum Systems With and Without Time-Reversal Invariance
2018-01-24  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

 Chinese Academy of Sciences

Seminar

Title

题目

Chaotic Scattering in Quantum Systems With and Without Time-Reversal Invariance

Speaker

报告人

Professor Barbara Dietz

Affiliation

所在单位

Department of Physics, Lanzhou University

Date

日期

2018年1月24日(周三)下午3:30

Venue

地点

ITP New Building 6420

Abstract

摘要

We present our theoretical results obtained from the random-matrix approach to quantum chaotic scattering for systems with partially violated time-reversal (T) invariance. They were tested most precisely in measurements of scattering amplitudes of a chaotic microwave resonator in the regime of isolated and overlapping resonances. Below a certain excitation frequency the resonator simulates a quantum billiard, whose eigenvalues manifest themselves in the spectra as resonances with average spacing d and width Γ. Violation of T invariance is achieved with a magnetized ferrite inside the cavity. The experimental observables are complex scattering (S)-matrix elements, measured for the resonator with and without T invariance as a function of frequency. Particular emphasis is given to S-matrix correlation functions in the regime of weakly overlapping resonances, i.e., Γ /d < 1, and their comparison to results from the theory of chaotic scattering developed in nuclear reaction theory. We also present results on the distribution of the S-matrix elements and higher order correlation functions. Here, a focus is the transition from the regime of weakly overlapping resonances to the Ericson regime, i.e., from non-exponential to exponential decay of the system of resonances.

Contact person

所内联系人

田矗舜

 

IE6.0浏览器,1024X768分辨率 版权所有 © 中国科学院理论物理研究所
地址:北京市海淀区中关村东路55号 邮政编码:100190
京ICP备05002865号】 京公网安备1101080094号