學術

物理學系安鈞鴻學術報告的告訴(Physics Department Colloquium)

編輯:沈一樂 來歷:物理學系 時候:2021年03月23日 拜候次數:0  源地址

標題問題:Floquet engineering in quantum systems

報告人:安鈞鴻 蘭州大學物理迷信與手藝學院   

地址: 教十二—201

時候: 326日,周五,15:30-16:30

 

擇要

Floquet engineering, i.e., coherent control via periodic driving, has become a highly versatile tool in quantum control. The main idea resides in that the concept of energy spectrum in static systems can be completely inherited as the quasienergy spectrum in periodically driven systems according to Floquet theory. Many efforts have been devoted to explore non-trivial effects induced by periodic driving on quantum systems. In this talk, I will report that interesting nonequilibrium quantum phase transitions (QPTs) can be triggered by engineering non-trivial band-gap structure and bound states in the quasi-energy spectrum using periodic driving. I will clarify this idea by two examples. One is to induce exotic topological QPT in both of Hermitian and non-Hermitian systems by periodic driving. A widely tunable number of topologically protected edge modes can be generated by a well-designed periodic driving, which relaxes greatly the experimental realization in the static case and improve the controllability of topological states of matter. Another is to induce non-equilibrium QPT in the total system consisting of open system and its environment by periodic driving. It is found that whenever the QPT manifested by the formation of midgap states in the quasienergy spectrum occurs, the decoherence of the open system can be suppressed. This opens an avenue to control decoherence by periodic driving.

 

小我簡介

 

安鈞鴻,蘭州大學傳授。2005年在蘭州大學獲博士學位,并留校任務。2006年至2007年在臺灣勝利大學處置博士后,2007年至2014年在新加坡國立大學處置研討員、拜候研討員;2011年受聘為傳授;2013年當選教導部新世紀優異人材撐持打算;2016年當選甘肅省飛天學者;2017年當選中心軍委科技委國防科技立異特區主題專家組專家;2019年當選國度“萬人打算”青年拔尖人材。首要處置開放量子體系、周期性驅動等體系的非平權衡子物理研討。

接待教員和同窗參與!


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