Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2

Philipp Nagler, Mariana V. Ballottin, Anatolie A. Mitioglu, Mikhail V. Durnev, Takashi Taniguchi, Kenji Watanabe, Alexey Chernikov, Christian Schüller, Mikhail M. Glazov, Peter C. M. Christianen, and Tobias Korn
Phys. Rev. Lett. 121, 057402 – Published 2 August 2018
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Abstract

Atomically thin semiconductors provide an ideal testbed to investigate the physics of Coulomb-bound many-body states. We shed light on the intricate structure of such complexes by studying the magnetic-field-induced splitting of biexcitons in monolayer WS2 using polarization-resolved photoluminescence spectroscopy in out-of-plane magnetic fields up to 30 T. The observed g factor of the biexciton amounts to about 3.9, closely matching the g factor of the neutral exciton. The biexciton emission shows an inverted circular field-induced polarization upon linearly polarized excitation; i.e., it exhibits preferential emission from the high-energy peak in a magnetic field. This phenomenon is explained by taking into account the hybrid configuration of the biexciton constituents in momentum space and their respective energetic behavior in magnetic fields. Our findings reveal the critical role of dark excitons in the composition of this many-body state.

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  • Received 17 January 2018
  • Revised 23 April 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.057402

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Philipp Nagler1,*, Mariana V. Ballottin2, Anatolie A. Mitioglu2, Mikhail V. Durnev3, Takashi Taniguchi4, Kenji Watanabe4, Alexey Chernikov1, Christian Schüller1, Mikhail M. Glazov3, Peter C. M. Christianen2, and Tobias Korn1,†

  • 1Department of Physics, University of Regensburg, D-93040 Regensburg, Germany
  • 2High Field Magnet Laboratory (HFML—EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
  • 3Ioffe Institute, 194021 St. Petersburg, Russia
  • 4National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan

  • *philipp.nagler@ur.de
  • tobias.korn@ur.de

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Issue

Vol. 121, Iss. 5 — 3 August 2018

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