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.

Non equilibrium anisotropic excitons in atomically thin ReS2 / Urban, Jm; Baranowski, M; Kuc, A; Klopotowski, L; Surrente, A; Ma, Y; Wlodarczyk, D; Suchocki, A; Ovchinnikov, D; Heine, T; Maude, Dk; Kis, A; Plochocka, P. - In: 2D MATERIALS. - ISSN 2053-1583. - 6:1(2019). [10.1088/2053-1583/aae9b9]

Non equilibrium anisotropic excitons in atomically thin ReS2

Surrente A;
2019

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 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.
2019
electronic properties; energy gap; excitons photoluminescence; temperature Van der Waals forces
01 Pubblicazione su rivista::01a Articolo in rivista
Non equilibrium anisotropic excitons in atomically thin ReS2 / Urban, Jm; Baranowski, M; Kuc, A; Klopotowski, L; Surrente, A; Ma, Y; Wlodarczyk, D; Suchocki, A; Ovchinnikov, D; Heine, T; Maude, Dk; Kis, A; Plochocka, P. - In: 2D MATERIALS. - ISSN 2053-1583. - 6:1(2019). [10.1088/2053-1583/aae9b9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1397842
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