报告题目 (Title)：Goos-Hänchen shift via chiral quantum-dot systems and its application in technology（手性量子点系统中的古斯-汉欣位移及其应用）

报告人 (Speaker)：Muhammad Idrees 博士（浙江大学）

报告时间 (Time)：2023年6月12日 (周一) 10:30

报告地点 (Place)：校本部 E106

邀请人 (Inviter)：张永平 教授

主办部门 (Organizer)：理学院物理系

摘要 (Abstract)：

The role of a chiral quantum-dot (QD) system in controlling and enhancing the Goos-Hänchen (GH) shift is revealed here. The proposed setup is a four-level atomic system excited by incoherent pump and probe fields where the electron tunneling is prominent in affecting the GH shift upon the reflection and transmission of probe beams. The GH shifts in the chiral QD system are calculated analytically by using stationary phase theory, whereas the dynamics of the quantum dots system are derived by the density matrix method. It is demonstrated that the GH shifts through transmission and reflection light beams are strongly influenced due to right-circular polarized (RCP) and left-circular polarized (LCP) light. The GH shifts through RCP light are enhanced in the presence of chiral QDM systems, and these shifts could become either highly negative or highly positive, sensitively depending on the electron tunneling and chiral coefficients. This proposal can be viewed as a novel theoretical approach to the potential application of GH shifts in nano-optoelectronic sensors, biological imaging and display technologies etc.