Reference : Control of excitonic absorption by thickness variation in few-layer GaSe
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/41953
Control of excitonic absorption by thickness variation in few-layer GaSe
English
Budweg, Arne [Univ Konstanz, Dept Phys, D-78457 Constance, Germany.]
Yadav, Dinesh []
Grupp, Alexander []
Alfred, Leitenstorfer []
Trushin, Maxim []
Pauly, Fabian []
Brida, Daniele mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
2019
PHYSICAL REVIEW B
AMER PHYSICAL SOC
100
4
Yes (verified by ORBilu)
2469-9950
ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
[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.
http://hdl.handle.net/10993/41953
10.1103/PhysRevB.100.045404 045404
Article

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