The role of electron-phonon interaction on the transport properties of graphene based nano-devices

MOĞULKOÇ A., Modarresi M., KANDEMİR B. S., Roknabadi M. R., Shahtahmasebi N., Behdani M.

PHYSICA B-CONDENSED MATTER, vol.446, pp.85-91, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 446
  • Publication Date: 2014
  • Doi Number: 10.1016/j.physb.2014.04.034
  • Journal Name: PHYSICA B-CONDENSED MATTER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.85-91
  • Keywords: Graphene quantum dot, Electronic transport, Holstein Hubbard model, Electron-phonon interaction, SUPERCONDUCTIVITY, DISORDER
  • Ankara University Affiliated: Yes

Abstract

Transport through a nano-device in the presence of electron-phonon interaction has been studied by using unitary-transformation scheme together with the non-equilibrium Green's function formalism. The non-interacting Hamiltonian is written within the tight binding model and left/right electrodes are described in wide-band approximation. The interaction between electrons is studied in the mean-held Hubbard model. Our results indicate that both phonon-restricted and phonon-assisted transport through two different configurations of graphene quantum dot occur. Also, the electron-phonon interaction screens the electron-electron interaction, and reduces the spin polarization. (C) 2014 Elsevier B.V. All rights reserved.