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- Title
Photoinduced Dynamical Band Gap in Graphene: The Effects of Electron–Phonon and Spin–Orbit Interaction.
- Authors
Kandemir, Bekir S.; Akay, Defne
- Abstract
The combined effects of electron–A1g 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 Fröhlich‐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–A1g 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. This article demonstrates theoretically that the Haldane interaction induced by photo‐irradiation breaks the fourfold SU(4) symmetry of spin–orbit‐coupled graphene in the presence of electron–A1g phonon interaction, and thus it induces asymmetric dynamical band gap at each valley. This makes possible to realize valley polarization in graphene by controlling the strengths of Rashba spin–orbit coupling and photo‐irradiation.
- Subjects
GRAPHENE synthesis; ELECTRON-phonon interactions; SPIN-orbit interactions; PHOTOINDUCED electron transfer; PHOTOINDUCED proton transfer
- Publication
Physica Status Solidi (B), 2018, Vol 255, Issue 10, pN.PAG
- ISSN
0370-1972
- Publication type
Article
- DOI
10.1002/pssb.201800163