Control of excitonic absorption by thickness variation in few-layer GaSe

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Physical Review B. 2019, 100(4), 045404. ISSN 0163-1829. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.100.045404
Zusammenfassung

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.

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ISO 690BUDWEG, Arne, Dinesh YADAV, Alexander GRUPP, Alfred LEITENSTORFER, Maxim TRUSHIN, Fabian PAULY, Daniele BRIDA, 2019. Control of excitonic absorption by thickness variation in few-layer GaSe. In: Physical Review B. 2019, 100(4), 045404. ISSN 0163-1829. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.100.045404
BibTex
@article{Budweg2019Contr-41924.2,
  year={2019},
  doi={10.1103/PhysRevB.100.045404},
  title={Control of excitonic absorption by thickness variation in few-layer GaSe},
  number={4},
  volume={100},
  issn={0163-1829},
  journal={Physical Review B},
  author={Budweg, Arne and Yadav, Dinesh and Grupp, Alexander and Leitenstorfer, Alfred and Trushin, Maxim and Pauly, Fabian and Brida, Daniele},
  note={Article Number: 045404}
}
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