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Quantized exciton-exciton annihilation in monolayer WS2 on SrTiO3 substrate with atomically flat terraces

Yuto Kajino1,*, Kohei Sakanashi2, Nobuyuki Aoki2,3, Kenji Watanabe4, Takashi Taniguchi5, Kenichi Oto1,3, and Yasuhiro Yamada1,†

  • 1Department of Physics, Chiba University, Inage, Chiba 263-8522, Japan
  • 2Department of Materials Science, Chiba University, Inage, Chiba 263-8522, Japan
  • 3Molecular Chirality Research Center, Chiba University, Chiba 263-8522, Japan
  • 4Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 5International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

  • *Author to whom all correspondence should be addressed: kajino@chiba-u.jp
  • †yasuyamada@chiba-u.jp
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Phys. Rev. B 103, L241410 – Published 21 June, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L241410

Abstract

Monolayer materials are strongly affected by their potential fluctuations, which can be induced by an intrinsic corrugation or the surface roughness of the substrate. We compare the effective exciton-exciton annihilation (EEA) rate constants of monolayer WS2 on substrates with different surface topographies. We show that the WS2 monolayers on the substrates with atomically flat terraces have small effective EEA rate constants that deviate from the overall tendency and exhibit multiple exciton decay components, which cannot be accounted for by the conventional EEA model. To obtain a correct description, it is important to use a quantized EEA model. The intrinsic EEA rate constants for the flat-terrace substrates determined by this model are comparable to that of hBN-encapsulated monolayer WS2.

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Phys. Rev. B 103, L241410– Published 21 June, 2021
  • Received 9 July 2020
  • Revised 19 May 2021
  • Accepted 24 May 2021
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