声子色散对单层石墨烯中弱耦合极化子性质的影响  

Influence of phonon dispersion on weak coupling polaron in monolayer graphene

作　　者：杨洪涛 冀文慧[1,2] YANG Hongtao;JI Wenhui(School of Physics,Inner Mongolia Jining Normal University,Ulanqab 012000,China;Institute of Condensed Matter Physics,Inner Mongolia Jining Normal University,Ulanqab 012000,China)

机构地区：[1]集宁师范学院物理学院,内蒙古乌兰察布012000 [2]集宁师范学院凝聚态物理研究所,内蒙古乌兰察布012000

出　　处：《量子电子学报》2020年第1期88-92,共5页Chinese Journal of Quantum Electronics

基　　金：内蒙古自治区高等学校科学研究项目,NJZC16317;内蒙古自治区高等学校青年科技英才支持计划,NJYT-17-B37。

摘　　要：利用线性组合算符和LLP变分相结合的方法,考虑纵光学(LO)声子色散,研究了声子色散对单层石墨烯弱耦合极化子性质的影响.在抛物色散近似下导岀了单层石墨烯弱耦合极化子基态能和零朗道能级的分裂能随声子色散系数的变化关系.数值计算结果表明基态能量随德拜截止波数增大而增大,零朗道能级的分裂能级差随声子色散系数的增大而减小.The influence of the phonon dispersion on the weak coupling polaron in monolayer graphene is investigated by using the linear combination operator and LLP unitary transformation met hod and taking account of the longitudinal optical(LO)phonons dispersion.The ground state energy and the zero-Landau level splitting energy in monolayer graphene as a function of the coefficient of the phonon dispersion are obtained in a parabolic dispersion approximation.Numerical calculation results show that the ground state energy increases with the increasing of Debye cut-off wave number,and the zero-Landau level splitting energy decreases with the increasing of phonon dispersion coefficient.

关 键 词：光电子学 石墨烯 极化子 线性组合算符 声子色散 

分 类 号：O469[理学—凝聚态物理]