論文

査読有り
2020年7月

Spin-caloritronic transport in hexagonal graphene nanoflakes

PHYSICAL REVIEW B
  • Thi Thu Phung
  • ,
  • Robert Peters
  • ,
  • Andreas Honecker
  • ,
  • Guy Trambly de Laissardiere
  • ,
  • Javad Vahedi

102
3
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.102.035160
出版者・発行元
AMER PHYSICAL SOC

We investigate the spin-dependent thermoelectric effect of graphene flakes with magnetic edges in the ballistic regime. Employing static, respectively, dynamic mean-field theory we first show that magnetism appears at the zigzag edges for a window of Coulomb interactions that increases significantly with increasing flake size. We then use the Landauer formalism in the framework of the nonequilibrium Green's function method to calculate the spin and charge currents in magnetic hexagonal graphene flakes by varying the temperature of the junction for different flake sizes. While in nonmagnetic gated graphene the temperature gradient drives a charge current, we observe a significant spin current for hexagonal graphene flakes with magnetic zigzag edges. Specifically, we show that in the "meta" configuration of a hexagonal flake subject to weak Coulomb interactions, a pure spin current can be driven just by a temperature gradient in a temperature range that is promising for device applications. Bigger flakes are found to yield a bigger window of Coulomb interactions where such spin currents are induced by the magnetic zigzag edges, and larger values of the current.

Web of Science ® 被引用回数 : 4

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.102.035160
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000553247500002&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevB.102.035160
  • ISSN : 2469-9950
  • eISSN : 2469-9969
  • Web of Science ID : WOS:000553247500002

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