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From the same journal

Gate-Tunable Reversible Rashba−Edelstein Effect in a Few-Layer Graphene/2H-TaS2 Heterostructure at Room Temperature

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Author(s)

  • Lijun Li
  • Jin Zhang
  • Gyuho Myeong
  • Wongil Shin
  • Hongsik Lim
  • Boram Kim
  • Seungho Kim
  • Taehyeok Jin
  • Stuart Alan Cavill
  • Beom Seo Kim
  • Changyoung Kim
  • Johannes Lischner
  • Aires Ferreira
  • Sungjae Cho

Department/unit(s)

Publication details

JournalACS Nano
DateAccepted/In press - 8 Apr 2020
DateE-pub ahead of print - 8 Apr 2020
DatePublished (current) - 26 May 2020
Issue number5
Volume14
Number of pages9
Pages (from-to)5251-5259
Early online date8/04/20
Original languageEnglish

Abstract

We report the observation of current-induced spin polarization, the Rashba−Edelstein effect (REE), and its Onsager reciprocal phenomenon, the spin galvanic effect (SGE), in a few-layer graphene/2H-TaS2 heterostructure at room temperature. Spin-sensitive electrical measurements unveil full spin-polarization reversal by an applied gate voltage. The observed gate-tunable charge-to-spin conversion is explained by the ideal work function mismatch between 2H-TaS2 and graphene, which allows for a strong interface-induced Bychkov−Rashba interaction with a spin-gap reaching 70 meV, while keeping the Dirac nature of the spectrum intact across electron and hole sectors. The reversible electrical generation and control of the nonequilibrium spin polarization vector, not previously observed in a nonmagnetic material, are elegant manifestations of emergent two-dimensional Dirac Fermions with robust spin-helical structure. Our experimental findings, supported by first-principles relativistic electronic structure and transport calculations, demonstrate a route to design low-power spin−logic circuits from layered materials.

Bibliographical note

© 2020 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

    Research areas

  • graphene, 2D materials, edelstein effect, Rashba edelstein effect, spin galvanic effect, spintronics

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