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  • Letter
  • Open Access

Emergent trion-phonon coupling in atomically reconstructed MoSe2−WSe2 heterobilayers

Sebastian Meier1, Yaroslav Zhumagulov2, Matthias Dietl1, Philipp Parzefall1, Michael Kempf3, Johannes Holler1, Philipp Nagler1, Paulo E. Faria Junior2, Jaroslav Fabian2 et al.

Tobias Korn3 and Christian Schüller1,*

  • 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 2Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 3Institut für Physik, Universität Rostock, D-18059 Rostock, Germany

  • *christian.schueller@ur.de
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Phys. Rev. Research 5, L032036 – Published 13 September, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L032036

Abstract

In low-temperature resonant Raman experiments on MoSe2−WSe2 heterobilayers, we identify a hybrid interlayer shear mode (HSM) with an energy close to the interlayer shear mode (SM) of the heterobilayers, but with a much broader, asymmetric lineshape. The HSM shows a pronounced resonance with the intralayer hybrid trions (HX−) of the MoSe2 and WSe2 layers only. No resonance with the neutral intralayer excitons is found. First-principles calculations reveal a strong coupling of Q-valley states, which are delocalized over both layers and participate in the HX− with the SM. This emerging trion-phonon coupling may be relevant for experiments on gate-controlled heterobilayers.

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Phys. Rev. Research 5, L032036– Published 13 September, 2023
  • Received 2 June 2023
  • Accepted 7 August 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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