Characteristics of strong-coupling bipolaron qubit in two-dimensional quantum dot in electric field  

作　　者：张颖 韩超 额尔敦朝鲁 

机构地区：[1]Department of Physics,Hebei Normal University of Science and Technology

出　　处：《Optoelectronics Letters》2015年第5期386-389,共4页光电子快报（英文版）

基　　金：supported by the Natural Science Foundation of Hebei Province(No.E2013407119);the Items of Institution of Higher Education Scientific Research of Hebei Province(Nos.ZD20131008 and Z2015149)

摘　　要：Based on Lee-Low-Pines(LLP) unitary transformation, this article adopts the variational method of the Pekar type and gets the energy and wave functions of the ground state and the first excited state of strong-coupling bipolaron in two-dimensional quantum dot in electric field, thus constructs a bipolaron qubit. The numerical results represent that the time oscillation period T0 of probability density of the two electrons in qubit decreases with the increasing electric field intensity F and dielectric constant ratio of the medium η; the probability density Q of the two electrons in qubit oscillates periodically with the increasing time t; the probability of electron appearing near the center of the quantum dot is larger, while that appearing away from the center of the quantum dot is much smaller.

关 键 词：appearing unitary dielectric periodically excited phonon constructs coordinates variational coherent 

分 类 号：O471.1[理学—半导体物理]