Effects of Electric and Magnetic Fields on Pure Dephasing of Exciton Qubits  

作　　者：LIU Yun-Fei XIAO Jing-Lin 

机构地区：[1]Department of Mathematics and Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China [2]College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China

出　　处：《Communications in Theoretical Physics》2009年第3期540-544,共5页理论物理通讯（英文版）

基　　金：supported by National Natural Science Foundation of China under Grant No.10347004

摘　　要：In a two-dimensional quantum dot （QD） with parabolic confinement potential, we investigate pure dephasing due to deformation potential exciton-bulk longitudinal acoustic phonons （LAP） interaction for exciton qubits under the influence of external static electric and magnetic fields by adopting the full quantum-mechanical method of Kunihiro Kojima and Akihisa Tomita. The wave function is found and the dependence of the pure dephasing factor on the confinement length of the QD and time and temperature is discussed. We find the external electric and magnetic fields have important effects on pure dephasing of exciton qubits because exciton-LAP interaction increases, leading to more pure dephasing.

关 键 词：quantum dot EXCITON QUBIT 

分 类 号：O413.1[理学—理论物理] Q93[理学—物理]