Effects of electron-acoustic phonon interaction in the presence of spin-orbit couplings in graphene

MOĞULKOÇ A.

PHYSICA B-CONDENSED MATTER, cilt.473, ss.20-25, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 473
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.physb.2015.05.029
  • Dergi Adı: PHYSICA B-CONDENSED MATTER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.20-25
  • Anahtar Kelimeler: Graphene, Electron-phonon interaction, Spin-orbit coupling, CONDUCTIVITY, SCATTERING
  • Ankara Üniversitesi Adresli: Hayır

Özet

We investigate the effects of electron-zone center acoustic phonon interaction on spin-orbit couplings in pristine graphene. We examine the polaron formation and analyse the effects of spin-orbit couplings on polaron formation and electron-phonon couplings. Frohlich type Hamiltonian within the continuum limit is used to describe the electron-phonon system. With theoretical analysis, we show that, in the presence of electron-phonon interaction, the intrinsic and Rashba spin-orbit couplings of graphene become k dependent and Rashba spin-orbit coupling exhibits different characters with respect to spin orientation. Even there is a symmetry between electron-hole states if only one spin-orbit mechanism is present, electron-phonon coupling induces symmetry breaking between electron-hole states. Moreover, polaronic effect is decreased for both spin states, but it is increased beyond the some critical values of k for spin-up states in the presence of spin-orbit couplings. (C) 2015 Elsevier B.V. All rights reserved.