Optical dipole orientation of interlayer excitons in MoSe2WSe2 heterostacks

Lukas Sigl, Mirco Troue, Manuel Katzer, Malte Selig, Florian Sigger, Jonas Kiemle, Mauro Brotons-Gisbert, Kenji Watanabe, Takashi Taniguchi, Brian D. Gerardot, Andreas Knorr, Ursula Wurstbauer, and Alexander W. Holleitner
Phys. Rev. B 105, 035417 – Published 14 January 2022

Abstract

We report on the far-field photoluminescence intensity distribution of interlayer excitons in MoSe2WSe2 heterostacks as measured by back focal plane imaging in the temperature range between 1.7 and 20 K. By comparing the data with an analytical model describing the dipolar emission pattern in a dielectric environment, we are able to obtain the relative contributions of the in- and out-of-plane transition dipole moments associated to the interlayer exciton photon emission. We determine the transition dipole moments for all observed interlayer exciton transitions to be (99±1)% in plane for R- and H-type stacking, independent of the excitation power and therefore the density of the exciton ensemble in the experimentally examined range. Finally, we discuss the limitations of the presented measurement technique to observe correlation effects in exciton ensembles.

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  • Received 20 October 2021
  • Revised 17 December 2021
  • Accepted 20 December 2021

DOI:https://doi.org/10.1103/PhysRevB.105.035417

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Lukas Sigl1,*, Mirco Troue1, Manuel Katzer2, Malte Selig2, Florian Sigger1, Jonas Kiemle1, Mauro Brotons-Gisbert3, Kenji Watanabe4, Takashi Taniguchi5, Brian D. Gerardot3, Andreas Knorr2, Ursula Wurstbauer6, and Alexander W. Holleitner1,†

  • 1Walter Schottky Institute and Physics Department, TU Munich, Am Coulombwall 4a, 85748 Garching, Germany
  • 2Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, 10623 Berlin, Germany
  • 3Institute of Photonics and Quantum Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 4Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan
  • 5International Center for Materials Nanoarchitectures, National Institute for Materials Science, Tsukuba 305-0044, Japan
  • 6Institute of Physics, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

  • *lukas.sigl@wsi.tum.de
  • holleitner@wsi.tum.de

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Vol. 105, Iss. 3 — 15 January 2022

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