Density-Dependent Quantum Hall States and Zeeman Splitting in Monolayer and Bilayer WSe2

Hema C. P. Movva, Babak Fallahazad, Kyounghwan Kim, Stefano Larentis, Takashi Taniguchi, Kenji Watanabe, Sanjay K. Banerjee, and Emanuel Tutuc
Phys. Rev. Lett. 118, 247701 – Published 15 June 2017

Abstract

We report a study of the quantum Hall states (QHS) of holes in mono- and bilayer WSe2. The QHS sequence transitions between predominantly even and predominantly odd filling factors as the hole density is tuned in the range 1.612×1012cm2. Measurements in tilted magnetic fields reveal an insensitivity of the QHS to the in-plane magnetic field, evincing that the hole spin is locked perpendicular to the WSe2 plane. Furthermore, the QHS sequence is insensitive to an applied electric field. These observations imply that the QHS sequence is controlled by the Zeeman-to-cyclotron energy ratio, which remains constant as a function of perpendicular magnetic field at a fixed carrier density, but changes as a function of density due to strong electron-electron interaction.

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  • Received 10 February 2017

DOI:https://doi.org/10.1103/PhysRevLett.118.247701

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hema C. P. Movva1, Babak Fallahazad1, Kyounghwan Kim1, Stefano Larentis1, Takashi Taniguchi2, Kenji Watanabe2, Sanjay K. Banerjee1, and Emanuel Tutuc1,*

  • 1Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA
  • 2National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • *etutuc@mer.utexas.edu

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Issue

Vol. 118, Iss. 24 — 16 June 2017

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