Spin dependent transport through triangular graphene quantum dot in the presence of Rashba type spin-orbit coupling

Modarresi M., KANDEMİR B. S., Roknabadi M. R., Shahtahmasebi N.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol.367, pp.81-85, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 367
  • Publication Date: 2014
  • Doi Number: 10.1016/j.jmmm.2014.05.003
  • Journal Name: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.81-85
  • Keywords: Graphene quantum dot, Rashba spin-orbit, Green's function, SHAPE
  • Ankara University Affiliated: Yes

Abstract

Electronic, magnetic and transport properties of a triangle graphene quantum clot have been studied in the presence of Rashba type spin-orbit coupling. The non-interacting part is written in the tight-binding model, and we use the Kene-Mele-Hubbard (KMH) Hamiltonian to describe the electron-electron and the Rashba spin-orbit interaction. While the Hubbard tel split the spin up and down states, the Rashba tel mixed these states. The competition between these two effects produces an interesting situation in a nano-device. Our results indicate that the magnetization of zigzag edge and spin coherence are decreased due to the Rashba spin-orbit interaction in the triangle graphene quantum dot It is shown that the reduction of spin coherence is non-negligible even in the case of weak Rashba spin-orbit interaction. (C) 2014 Elsevier By. All rights reserved.