標題：Floquet Engineering in Quantum Systems
演講人： 安鈞鴻 蘭州大學
時間： 2021-06-23 10:00-2021-06-23 11:30
地點：S327, MMW Building

內容：

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 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 Floquet engineering to second-order topological semimetals (SOTSMs). Many exotic SOTSMs absent in natural materials, e.g., a widely tunable number of Dirac nodes and hinge Fermi arcs, the adjacent Dirac nodes with same chirality, and the coexisting Dirac nodal points and nodal loops, and hybrid-order Weyl semimetals with the coexisting hinge and surface Fermi arcs, are generated at ease by the periodic driving. By this, I want to deliver a message that Floquet engineering supplies a convenient way to explore exotic topological matters by adding time-periodicity as a novel control dimension to quantum systems. 

人物介紹：

安鈞鴻，現任蘭州大學物理科學與技術學院教授。2005年在蘭州大學獲博士學位，并留校工作。2006年至2007年在臺灣成功大學從事博士后，2007年至2014年在新加坡國立大學從事研究員、訪問研究員；2011年受聘為教授；2013年入選教育部新世紀優秀人才支持計劃；2016年入選甘肅省飛天學者；2017年入選中央軍委科技委國防科技創新特區主題專家組專家；2019年入選國家“萬人計劃”青年拔尖人才。主要從事開放量子系統、周期性驅動系統等非平衡量子物理問題研究。