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

Máté Kedves1,2, Bálint Szentpéteri1,2, Albin Márffy2,3

  • 1Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest H-1111, Hungary.

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|October 16, 2023
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Summary

Hydrostatic pressure stabilizes a band-inverted phase in bilayer graphene (BLG) encapsulated in tungsten diselenide (WSe2). This pressure enhances the spin-orbit interaction (SOI) and increases the band gap by over 100%.

Keywords:
WSe2band inversionbilayer graphenepressurespin−orbit interactiontransport measurements

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Bilayer graphene (BLG) exhibits unique electronic properties influenced by spin-orbit interaction (SOI).
  • Transition metal dichalcogenides (TMDs) like tungsten diselenide (WSe2) induce strong SOI in proximate materials.
  • A band-inverted phase with unconventional topology has been theoretically predicted in BLG due to Ising-type SOI.

Purpose of the Study:

  • To experimentally stabilize and investigate the pressure-induced band-inverted phase in BLG.
  • To quantify the effect of hydrostatic pressure on the Ising-type SOI and the resulting band gap.
  • To confirm the enhancement of SOI under pressure using Landau level spectroscopy.

Main Methods:

  • Low-temperature transport measurements of BLG symmetrically encapsulated in WSe2.
  • Hydrostatic pressure applied to tune the electronic properties of the BLG/WSe2 heterostructure.
  • Thermal activation measurements to determine the SOI-induced band gap.
  • Landau level spectroscopy under varying magnetic fields to probe SOI dependence.

Main Results:

  • Successful stabilization of the band-inverted phase in BLG/WSe2 heterostructures under hydrostatic pressure.
  • Transport measurements consistent with a single-particle model featuring opposite-sign Ising SOI on the two graphene layers.
  • Thermal activation measurements show a >100% increase in the SOI-induced band gap with applied pressure.
  • Landau level spectra confirm the pressure-dependent enhancement of SOI.

Conclusions:

  • Hydrostatic pressure is an effective method to stabilize and tune the band-inverted topological phase in BLG/WSe2 systems.
  • The applied pressure significantly strengthens the Ising-type spin-orbit interaction, leading to a substantial increase in the band gap.
  • This work provides experimental validation for pressure-tunable topological phases driven by SOI in van der Waals heterostructures.