Photoinduced Dynamical Band Gap in Graphene: The Effects of Electron-Phonon and Spin-Orbit Interaction

被引：29
|
作者：
Kandemir, Bekir S. [1 ]
Akay, Defne [1 ,2 ]
机构：
[1] Ankara Univ, Dept Phys, Fac Sci, TR-06100 Ankara, Turkey
[2] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2018年 / 255卷 / 10期
关键词：
electron-phonon interaction; graphene; Haldane interaction; ZONE-BOUNDARY PHONON; UNIAXIAL STRAIN;
D O I：
10.1002/pssb.201800163
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The combined effects of electron-A(1g) phonon and Rashba spin-orbit couplings on the electronic spectrum of graphene in the presence of Haldane interaction induced by photo-irradiation have been studied. A Frohlich-type Hamiltonian has been proposed to model these interactions, and then a diagonalization procedure based on the Lee-Low-Pines (LLP) theory which includes two successive unitary transformations has been applied. The results show that combined effects arising from the Rashba spin-orbit interaction and electron-A(1g) phonon interaction in the presence of Haldane interaction remove the valley degeneracy of electronic bands, and thus allow one to tune the resulting band gap just by adjusting the associated strengths of the interactions.
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页数：6
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