Dissipationless spin-valley current in zigzag-edge graphene ribbons with a net magnetization

Kyu Won Lee, Cheol Eui Lee

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9 Citations (Scopus)

Abstract

We have investigated the spin-valley degree of freedom characterized by the product of spin and valley indices in zigzag-edge graphene ribbons with a net magnetization by using a tight-binding model. We found that the CT invariance leads to the spin-valley current which is neither spin polarized nor valley polarized but fully spin-valley polarized, where C and T are the charge conjugation and the time-reversal operation, respectively. In the quantum Hall regime, the gapless edge states protected by the CPT invariance carry the spin-valley degree of freedom leading to a dissipationless spin-valley current, where P is the inversion operation.

Original languageEnglish
Article number195132
JournalPhysical Review B
Volume95
Issue number19
DOIs
Publication statusPublished - 2017 May 16

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (Projects No. 2016R1D1A1A09917003, No. 2016R1D1A1B03931144, No. 2015M1A7A1A01002234, and No. NRF-2010-0027963). K.W.L. gratefully acknowledges a Korea University research grant.

Publisher Copyright:
© 2017 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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