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The direct-to-indirect band gap crossover in two-dimensional van der Waals Indium Selenide crystals

Mudd, G.W.; Molas, M.R.; Chen, X.; Zólyomi, V.; Nogajewski, K.; Kudrynskyi, Zakhar R.; Kovalyuk, Zakhar D.; Yusa, G.; Makarovsky, Oleg; Eaves, Laurence; Potemski, M.; Fal'ko, V.I.; Patanè, Amalia

Authors

G.W. Mudd

M.R. Molas

X. Chen

V. Zólyomi

K. Nogajewski

Zakhar R. Kudrynskyi

Zakhar D. Kovalyuk

G. Yusa

Oleg Makarovsky

Laurence Eaves

M. Potemski

V.I. Fal'ko

Amalia Patanè



Abstract

The electronic band structure of van der Waals (vdW) layered crystals has properties that depend on the composition, thickness and stacking of the component layers. Here we use density functional theory and high field magneto-optics to investigate the metal chalcogenide InSe, a recent addition to the family of vdW layered crystals, which transforms from a direct to an indirect band gap semiconductor as the number of layers is reduced. We investigate this direct-to-indirect bandgap crossover, demonstrate a highly tuneable optical response from the near infrared to the visible spectrum with decreasing layer thickness down to 2 layers, and report quantum dot-like optical emissions distributed over a wide range of energy. Our analysis also indicates that electron and exciton effective masses are weakly dependent on the layer thickness and are significantly smaller than in other vdW crystals. These properties are unprecedented within the large family of vdW crystals and demonstrates the potential of InSe for electronic and photonic technologies.

Journal Article Type Article
Publication Date 2016-12
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 6
Issue 1
Article Number 39619
APA6 Citation Mudd, G., Molas, M., Chen, X., Zólyomi, V., Nogajewski, K., Kudrynskyi, Z. R., …Patanè, A. (2016). The direct-to-indirect band gap crossover in two-dimensional van der Waals Indium Selenide crystals. Scientific Reports, 6(1), https://doi.org/10.1038/srep39619
DOI https://doi.org/10.1038/srep39619
Publisher URL http://www.nature.com/articles/srep39619
Related Public URLs https://rdmc.nottingham.ac.uk/handle/internal/72
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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