Optical dipole orientation of interlayer excitons in MoSe2-WSe2 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, Alexander W. Holleitner

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Abstract

We report on the far-field photoluminescence intensity distribution of interlayer excitons in MoSe2-WSe2 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.

Original languageEnglish
Article number035417
JournalPhysical Review B
Volume105
Issue number3
Early online date14 Jan 2022
DOIs
Publication statusPublished - 15 Jan 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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