二维电子波导/量子点结构中第二激发态对Fano共振的影响  

Influences of the second excited state on Fano resonances in 2D electron waveguide / quantum dot structure

作　　者：张其安[1] 周云松[1] 赵丽明[1] 

机构地区：[1]首都师范大学物理系,北京100048

出　　处：《大学物理》2014年第12期46-50,共5页College Physics

摘　　要：本文用解析理论研究电子波导管/量子点系统中Fano共振透射问题.在第一能量窗口中考虑高激发态影响,发现共振透射率和峰位基本保持不变,但是远离共振区的透射率明显低于只考虑第一激发态的情况.在第二能量窗口中,入射波有两个本征模,两个入射模产生的Fano共振基本在同一个位置.每一个入射本征模都可激发起两个传播模,其中的Fano共振是由与入射模波矢一致的传播模产生的.外电势会以线性关系影响共振峰位.The Fano resonance transmission in electron waveguide/quantum dot system is investigated theoretically. In the first energy window, the influence of second excited state on Fano resonance is considered. The calculation results show that the resonance energy, the resonance peak height, and the stopping energy are not affected, but the transmission in off-resonance energy region changed apparently. In the second energy window, there exist two incident eigenmodes, each incident mode can excite two transmission modes. For any incident mode, the corresponding transmission Fano resonance is attributed to the transmission mode possessing the wave victor same with the incident mode. The two incident modes bring the Fano resonances at the same energy point. The response of the Fano resonance position to external electric potential exhibits the linear characteristics.

关 键 词：Fano共振 电子波导 透射 

分 类 号：O482.3[理学—固体物理]