Article Stabilizing the Inverted Phase of a WSe2/BLG/WSe2 Heterostructure via Hydrostatic Pressure

Máté Kedves ; Bálint Szentpéteri ; Albin Márffy ; Endre Tóvári ; Nikos Papadopoulos ; Prasanna K. Rout ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Srijit Goswami ; Szabolcs Csonka ; Péter Makk

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Máté Kedves, Bálint Szentpéteri, Albin Márffy, Endre Tóvári, Nikos Papadopoulos, Prasanna K. Rout, Kenji Watanabe, Takashi Taniguchi, Srijit Goswami, Szabolcs Csonka, Péter Makk. Stabilizing the Inverted Phase of a WSe2/BLG/WSe2 Heterostructure via Hydrostatic Pressure. Nano Letters. 2023, 23 (20), 9508-9514. https://doi.org/10.1021/acs.nanolett.3c03029
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(abstract)

Bilayer graphene (BLG) was recently shown to host a band-inverted phase with unconventional topology emerging from the Ising-type spin–orbit interaction (SOI) induced by the proximity of transition metal dichalcogenides with large intrinsic SOI. Here, we report the stabilization of this band-inverted phase in BLG symmetrically encapsulated in tungsten-diselenide (WSe2) via hydro- static pressure. Our observations from low temperature transport measurements are consistent with a single particle model with induced Ising SOI of opposite sign on the two graphene layers. To con- firm the stabilization of the inverted phase, we present thermal activation measurements and show that the SOI-induced band gap increases by more than 100% due to the applied pressure. Finally, the investigation of Landau level spectra reveals the magnetic field dependence of the level-crossings on the applied field, which further confirms the enhancement of SOI with pressure.

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Keyword: Band-inverted phase, Ising-type spin-orbit interaction, hydrostatic pressure

Date published: 2023-10-25

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 23 issue. 20 p. 9508-9514

Funding:

  • European Regional Development Fund 2.3.3-15-2017-00015
  • National Research, Development and Innovation Office 2022-2.1.1- NL-2022-00004
  • Bolyai Foundation
  • H2020 Future and Emerging Technologies
  • European Cooperation in Science and Technology CA 21144
  • Japan Society for the Promotion of Science 19H05790
  • Japan Society for the Promotion of Science 20H00354
  • Japan Society for the Promotion of Science 21H05233
  • European Social Fund 2.3.3-15-2017-00015
  • Innovációs és Technológiai Minisztérium UNKP-22-3-II
  • Ministry of National Resources, Hungary K138433
  • Ministry of National Resources, Hungary PD134758

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1021/acs.nanolett.3c03029

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Updated at: 2025-02-14 16:30:41 +0900

Published on MDR: 2025-02-14 16:30:42 +0900

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