Non equilibrium anisotropic excitons in atomically thin ReS2

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • J. M. Urban - , Université Grenoble Alpes (Author)
  • M. Baranowski - , Université Grenoble Alpes, Wrocław University of Science and Technology (Author)
  • A. Kuc - , Leipzig University, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Kłopotowski - , Polish Academy of Sciences (Author)
  • A. Surrente - , Université Grenoble Alpes (Author)
  • Y. Ma - , Leipzig University (Author)
  • D. Włodarczyk - , Polish Academy of Sciences (Author)
  • A. Suchocki - , Polish Academy of Sciences (Author)
  • D. Ovchinnikov - , Swiss Federal Institute of Technology Lausanne (EPFL) (Author)
  • T. Heine - , Chair of Theoretical Chemistry, Leipzig University, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • D. K. Maude - , Université Grenoble Alpes (Author)
  • A. Kis - , Swiss Federal Institute of Technology Lausanne (EPFL) (Author)
  • P. Plochocka - , Université Grenoble Alpes (Author)

Abstract

We present a systematic investigation of the electronic properties of bulk and few layer ReS2 van der Waals crystals using low temperature optical spectroscopy. Weak photoluminescence emission is observed from two non-degenerate band edge excitonic transitions separated by ∼20 meV. The comparable emission intensity of both excitonic transitions is incompatible with a fully thermalized (Boltzmann) distribution of excitons, indicating the hot nature of the emission. While DFT calculations predict bilayer ReS2 to have a direct fundamental band gap, our optical data suggests that the fundamental gap is indirect in all cases.

Details

Original languageEnglish
Article number015012
Journal2D materials
Volume6
Issue number1
Publication statusPublished - Jan 2019
Peer-reviewedYes

Keywords