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

doi:10.1088/2053-1583/aae9b9

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

20 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 language	English
Article number	015012
Journal	2D Materials
Volume	6
Issue number	1
DOIs	https://doi.org/10.1088/2053-1583/aae9b9
Publication status	Published - 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

Access to Document

10.1088/2053-1583/aae9b9

Cite this

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title = "Non equilibrium anisotropic excitons in atomically thin ReS2 ",

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.",

author = "Urban, {J. M.} and M. Baranowski and A. Kuc and K{\l}opotowski and A. Surrente and Y. Ma and D. W{\l}odarczyk and A. Suchocki and D. Ovchinnikov and T. Heine and Maude, {D. K.} and A. Kis and P. Plochocka",

note = "Funding Information: This work was partially supported by BLAPHENE and STRABOT projects, which received funding from the IDEX Toulouse, Emergence program, {\textquoteleft}Programme des Investissements d{\textquoteright}Avenir{\textquoteright} 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: {\textcopyright} 2018 IOP Publishing Ltd.",

year = "2019",

month = jan,

doi = "10.1088/2053-1583/aae9b9",

language = "English",

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AU - Urban, J. M.

AU - Baranowski, M.

AU - Kuc, A.

AU - Kłopotowski,

AU - Surrente, A.

AU - Ma, Y.

AU - Włodarczyk, D.

AU - Suchocki, A.

AU - Ovchinnikov, D.

AU - Heine, T.

AU - Maude, D. K.

AU - Kis, A.

AU - Plochocka, P.

N1 - 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.

PY - 2019/1

Y1 - 2019/1

N2 - 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.

AB - 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.

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