PT对称波导中周期势的调制对相变的影响  

Effect of Phase Transition in PT Symmetric Waveguides with Different Periodic Potentials

作　　者：胡蕊 郭利平[1] HU Rui;GUO Liping(Institute of Theoretical Physics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《山西大学学报（自然科学版）》2019年第1期165-170,共6页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(11674201;11574187)

摘　　要：一维排列满足PT对称的波导中,当势函数的实部和虚部周期相同时,且实部的强度V1大于虚部的强度V2,系统具有实的能谱。文章研究了势函数虚部周期不同于实部周期时的本征谱,并分析了存在实数谱的条件。在其PT对称区间,最低两能带能级免交叉,利用数值办法计算发现Landau-Zener隧穿的隧穿概率随着V1增大而减小,不随V2的变化而变化。In a one-dimensional waveguides with PT symmetry,when the periods and frequencies of real and imaginary part of the potential function are the same and then the intensity of the real part V1 is larger than of the imaginary part V2,the system has real energy spectrum.In addition,since there exists an avoided level crossing between the two lowest bands in the PT symmetric region,we find that the Landau-Zener tunneling probability decreases with the increasing of V1 and does not vary with V2 through numerical method.

关 键 词：PT对称波导 周期势 Landau-Zener隧穿概率 相变 

分 类 号：O469[理学—凝聚态物理]