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research article
Non equilibrium anisotropic excitons in atomically thin ReS2
January 1, 2019
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 similar to 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.
Type
research article
Web of Science ID
WOS:000449203600003
Authors
Urban, J. M.
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Baranowski, M.
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•
Klopotowski, L.
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•
Ma, Y.
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Wlodarczyk, D.
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Suchocki, A.
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•
Heine, T.
Publication date
2019-01-01
Publisher
Published in
Volume
6
Issue
1
Article Number
015012
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
January 23, 2019
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