单层石墨烯中声学极化子自陷的相关问题  

Electron-Acoustic Phonon Interaction In Monolayer Graphene

作　　者：侯嵩来 侯俊华[1] HOU Songlai;HOU Junhua(College of Physics and Information Engineering,Shanxi Normal University,041004,Linfen,Shanxi,PRC)

机构地区：[1]山西师范大学物理与信息工程学院

出　　处：《江西科学》2020年第1期20-23,共4页Jiangxi Science

基　　金：山西省自然科学基金面上项目(201901D111290);山西省高等学校科技创新项目(20191017)

摘　　要：研究了单层石墨烯中的电子-声学声子相互作用,并导出了单层石墨烯中声学极化子系统哈密顿量。利用极化子基态能量随电子-声学声子耦合常数的变化关系,研究了声学极化子在单层石墨烯的自陷转变。结果表明,在单层石墨烯中,靠近Dirac点的电子不能形成常规的极化子,进而在该点上也不能实现声学极化子的自陷转变。在Dirac点外,声学极化子的自陷情况与理想二维系统的理论描述相一致。The electron-acoustic phonon interaction in monolayer graphene is studied in this paper.The interaction Hamiltonian of the electron and acoustic phonon in monolayer graphene is derived.The self-trapping transition of the acoustic polaron monolayer graphene is investigated by using the variation of the ground-state energy of the acoustic polaron based on the electron-acoustic phonon coupling constant.It is shown that the electrons near the Dirac point can not form normal polarons and the self-trapping transition of the acoustic polaron can not realized in this point of the monolayer graphene.The result showed that outside the Dirac point,the self-trapping of acoustic polaron is consistent with the theory in ideal two-dimensional systems.

关 键 词：二维声学极化子 石墨烯 自陷转变 

分 类 号：O484[理学—固体物理]