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  • Letter

Trions in MoS2 are quantum superpositions of intra- and intervalley spin states

J. Klein1,2,*, M. Florian3,4, A. Hötger1, A. Steinhoff3, A. Delhomme5, T. Taniguchi6, K. Watanabe7, F. Jahnke3, A. W. Holleitner1 et al.

M. Potemski5, C. Faugeras5, A. V. Stier1,†, and J. J. Finley1,‡

  • 1Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
  • 2Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 3Institut für Theoretische Physik, Universität Bremen, P.O. Box 330 440, 28334 Bremen, Germany
  • 4Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, 48109 Michigan, USA
  • 5Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, 38000 Grenoble, France
  • 6International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 7Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

  • *jpklein@mit.edu
  • †andreas.stier@wsi.tum.de
  • ‡finley@wsi.tum.de
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Phys. Rev. B 105, L041302 – Published 31 January, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L041302

Abstract

We report magnetophotoluminescence spectroscopy of gated MoS2 monolayers in high magnetic fields to 28 T. At B=0 T and electron density ns∼1012 cm−2, we observe three trion resonances that cannot be explained within a single-particle picture. Employing ab initio calculations that take into account three-particle correlation effects as well as local and nonlocal electron-hole exchange interaction, we identify those features as quantum superpositions of inter- and intravalley spin states. We experimentally investigate the mixed character of the trion wave function via the filling factor dependent valley Zeeman shift in positive and negative magnetic fields. Our results highlight the importance of exchange interactions for exciton physics in monolayer MoS2 and provide insights into the microscopic understanding of trion physics in two-dimensional multivalley semiconductors for low excess carrier densities.

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Phys. Rev. B 105, L041302– Published 31 January, 2022
  • Received 16 January 2021
  • Revised 22 December 2021
  • Accepted 11 January 2022
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