Non equilibrium anisotropic excitons in atomically thin ReS2

J. M. Urban, M. Baranowski, A. Kuc, Kłopotowski, A. Surrente, Y. Ma, D. Włodarczyk, A. Suchocki, D. Ovchinnikov, T. Heine, D. K. Maude, A. Kis, P. Plochocka

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12 Citations (Scopus)

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.

Original languageEnglish
Article number015012
Journal2D Materials
Volume6
Issue number1
DOIs
Publication statusPublished - 2019 Jan

Bibliographical note

Funding Information:
This work was partially supported by BLAPHENE and STRABOT projects, which received funding from the IDEX Toulouse, Emergence program, ‘Programme des Investissements d’Avenir’ under the program ANR-11-IDEX-0002-02, reference ANR-10-LABX-0037-NEXT, and by the PAN–CNRS collaboration within the PICS 2016-2018 agreement.MB appreciates support from the Polish Ministry ofScience and Higher Education within the Mobilnosc Plus program (grant no. 1648/MOB/V/2017/0). AK and TH acknowledge funding of Deutsche Forschungsgemeinschaft via the FlagERA project HE 3543/27-1 and ZIH Dresden for providing computational resources.

Publisher Copyright:
© 2018 IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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