The role of electron-phonon interaction on the transport properties of graphene based nano-devices
PHYSICA B-CONDENSED MATTER, cilt.446, ss.85-91, 2014 (SCI-Expanded, Scopus)
- 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.