Intrinsic circularly polarized exciton emission in a twisted van der Waals heterostructure

J. Michl, C. C. Palekar, S. A. Tarasenko, F. Lohof, C. Gies, M. Von Helversen, R. Sailus, S. Tongay, T. Taniguchi, K. Watanabe, T. Heindel, B. Rosa, M. Rödel, T. Shubina, S. Höfling, S. Reitzenstein, C. Anton-Solanas, C. Schneider

Research output: Contribution to journalArticlepeer-review

Abstract

We report the emergence of a significant degree of intrinsic circular polarization of exciton photoluminescence in a twisted MoSe2/WSe2 heterostructure upon nonresonant driving with a linearly polarized laser. The effect is not related to the polarization of the incident light. Moreover, it is present at zero magnetic field, and reacts perceptibly to a perpendicularly applied magnetic field that, unexpectedly, can strongly diminish this effect. The giant magnitude of the polarization, which cannot be explained by natural optical activity or circular dichroism of the twisted lattice, suggests a kinematic origin arising from an emergent pyromagnetic symmetry in our structure, which we exploit to gain insight into the microscopic optical processes of our device.

Original languageEnglish (US)
Article numberL241406
JournalPhysical Review B
Volume105
Issue number24
DOIs
StatePublished - Jun 15 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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