Possible polaron formation of zigzag graphene nano-ribbon in the presence of Rashba spin-orbit coupling

Modarresi M., MOĞULKOÇ A., Roknabadi M. R., Shahtahmasebi N.

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, cilt.66, ss.303-308, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 66
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.physe.2014.10.006
  • Dergi Adı: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.303-308
  • Anahtar Kelimeler: Zigzag graphene nanoribbon, Rashba spin-orbit coupling, Hubbard interaction, Tight-binding, QUANTUM-DOT, TRANSPORT
  • Ankara Üniversitesi Adresli: Evet

Özet

In this article we study the role of Rashba spin-orbit coupling and electron-phonon interaction on the electronic structure of zigzag graphene nanoribbon with different width. The total Hamiltonian of nanoribbon is written in the tight binding form and the electron-electron interaction is modeled in the Hubbard term. We used a unitary transformation to reach an effective Hamiltonian for nano ribbon in the presence of electron-phonon interaction. Our results show that small Rashba spin orbit coupling annihilates the anti-ferromagnetic phase in the zigzag edges of ribbon and the electron-phonon interaction yields small polaron formation in graphene nano ribbon. Furthermore, Rashba type spin-orbit coupling increases (decreases) the polaron formation energy for up (down) spin state. (C) 2014 Elsevier B.V. All rights reserved.