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Article Electrical Control and Transport of Tightly Bound Interlayer Excitons in a MoSe 2 / hBN / MoSe 2 Heterostructure

Lifu Zhang ; Liuxin Gu ; Ruihao Ni ; Ming Xie ; Suji Park ; Houk Jang ; Rundong Ma ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; You Zhou

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Lifu Zhang, Liuxin Gu, Ruihao Ni, Ming Xie, Suji Park, Houk Jang, Rundong Ma, Takashi Taniguchi, Kenji Watanabe, You Zhou. Electrical Control and Transport of Tightly Bound Interlayer Excitons in a MoSe 2 / hBN / MoSe 2 Heterostructure. Physical Review Letters. 2024, 132 (21), 216903. https://doi.org/10.1103/physrevlett.132.216903

Description:

(abstract)

Controlling interlayer excitons in van der Waals heterostructures holds promise for exploring Bose-Einstein condensates and developing novel optoelectronic applications, such as excitonic integrated circuits. Despite intensive studies, several key fundamental properties of interlayer excitons, such as their binding energies and interactions with charges, remain not well understood. Here we report the formation of momentum-direct interlayer excitons in a high-quality MoSe2/hBN/MoSe2 heterostructure under an electric field, characterized by bright photoluminescence (PL) emission with high quantum yield and a narrow linewidth of less than 4 meV. These interlayer excitons show electrically tunable emission energy spanning ~180 meV through the Stark effect, and exhibit a sizable binding energy of ~81 meV in the intrinsic regime, along with trion binding energies of a few millielectronvolts. Remarkably, we demonstrate the long-range transport of interlayer excitons with a characteristic diffusion length exceeding 10 μm, which can be attributed, in part, to their dipolar repulsive interactions. Spatially and polarization-resolved spectroscopic studies reveal rich exciton physics in the system, such as valley polarization, local trapping, and the possible existence of dark interlayer excitons. The formation and transport of tightly bound interlayer excitons with narrow linewidth, coupled with the ability to electrically manipulate their properties, open exciting new avenues for exploring quantum many-body physics, including excitonic condensate and superfluidity, and for developing novel optoelectronic devices, such as exciton and photon routers.

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Keyword: Interlayer excitons, Van der Waals heterostructures, Excitonic transport

Date published: 2024-05-24

Publisher: American Physical Society (APS)

Journal:

  • Physical Review Letters (ISSN: 10797114) vol. 132 issue. 21 p. 216903-216903 216903

Funding:

  • U.S. Department of Energy DE-SC-0022885
  • U.S. Department of Energy DE-SC0012704
  • National Science Foundation DMR-2145712
  • Brookhaven National Laboratory
  • Japan Society for the Promotion of Science 20H00354
  • Japan Society for the Promotion of Science 21H05233
  • Japan Society for the Promotion of Science 23H02052
  • Ministry of Education, Culture, Sports, Science and Technology
  • World Premier International Research Center Initiative

Manuscript type: Author's version (Accepted manuscript)

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First published URL: https://doi.org/10.1103/physrevlett.132.216903

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Updated at: 2025-08-28 08:30:35 +0900

Published on MDR: 2025-08-28 08:18:04 +0900

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