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, cilt.446, ss.85-91, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 446
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.physb.2014.04.034
  • Dergi Adı: PHYSICA B-CONDENSED MATTER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.85-91
  • Anahtar Kelimeler: Graphene quantum dot, Electronic transport, Holstein Hubbard model, Electron-phonon interaction, SUPERCONDUCTIVITY, DISORDER
  • Ankara Üniversitesi Adresli: Evet

Özet

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.