Article (Scientific journals)
Control of excitonic absorption by thickness variation in few-layer GaSe
Budweg, Arne; Yadav, Dinesh; Grupp, Alexander et al.
2019In Physical Review. B, 100 (4)
Peer reviewed
 

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Abstract :
[en] We control the thickness of GaSe on the level of individual layers and study the corresponding optical absorption via highly sensitive differential transmission measurements. Suppression of excitonic transitions is observed when the number of layers is smaller than a critical value of 8. Through ab initio modelling we are able to link this behavior to a fundamental change in the band structure that leads to the formation of a valence band shaped as an inverted Mexican hat in thin GaSe. The thickness-controlled modulation of the optical properties provides attractive resources for the development of functional optoelectronic devices based on a single material.
Disciplines :
Physics
Author, co-author :
Budweg, Arne;  Univ Konstanz, Dept Phys, D-78457 Constance, Germany.
Yadav, Dinesh
Grupp, Alexander
Alfred, Leitenstorfer
Trushin, Maxim
Pauly, Fabian
Brida, Daniele ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
yes
Language :
English
Title :
Control of excitonic absorption by thickness variation in few-layer GaSe
Publication date :
2019
Journal title :
Physical Review. B
ISSN :
2469-9950
Publisher :
AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, Unknown/unspecified
Volume :
100
Issue :
4
Peer reviewed :
Peer reviewed
Commentary :
Article
Available on ORBilu :
since 23 January 2020

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