单模压缩磁极化子的研究  

Single-mode squeezed magnetopolarons

作　　者：张彦敏[1] 成泽[1] 

机构地区：[1]华中科技大学物理系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2007年第4期75-77,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(1984700410474025)

摘　　要：在改进的Lee-Low-Pines(LLP-H)变换基础上引入单模压缩态变换来处理磁极化子的哈密顿量,并在定态矢下求期望值,应用变分法求得压缩磁极化子的基态及激发态能.结果表明:a.压缩态的引入使磁极化子的能级降低;b.磁极化子的压缩程度随着磁场的增大而减小;c.磁极化子能级的修正随着电-声相互作用的增加而增大;d.回旋质量-m0*,+1及-m1*,0都比电子的裸质量小,但-m0*,-1在强磁场时却比电子的裸质量大.Improved LLP-H canonical transformations were introduced into single-mode squeezed state transformation to deal with Hamiltonian of the magnetopolarons. Taken the expectation value as the certain states, the energies of ground and excited state of the squeezed magnetoppolarons were calculated by variational method. It is concluded that. a. Energy levels of magnetopolarons are lowered by introduction of the magnetopolarons, b. The squeezing effects reduce with the increase of the magnetic field strength, c. The level of the squeezing corrections to the energy of magnetopolarons increases with the increase of the strength of the electron-phonon interaction, d. Cyclotron masses of ^-m^＊0,＋1 and ^-m^＊1,0 are smaller than the band masses and ^-m^＊0,-1 becomes larger than the band masses under high magnetic fields.

关 键 词：压缩磁极化子 电-声相互作用 重整化质量 

分 类 号：O47[理学—半导体物理] O48[理学—物理]