Article (Scientific journals)
Excitons in boron nitride single layer
Galvani, Thomas; PALEARI, Fulvio; PEREIRA COUTADA MIRANDA, Henrique et al.
2016In Physical Review. B, Condensed Matter, 94 (125303)
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Abstract :
[en] Boron nitride single layer belongs to the family of two-dimensional materials whose optical properties are currently receiving considerable attention. Strong excitonic effects have already been observed in the bulk and still stronger effects are predicted for single layers. We present here a detailed study of these properties by combining ab initio calculations and a tight-binding Wannier analysis in both real and reciprocal space. Due to the simplicity of the band structure with single valence (π) and conduction (π∗) bands the tight-binding analysis becomes quasiquantitative with only two adjustable parameters and provides tools for a detailed analysis of the exciton properties. Strong deviations from the usual hydrogenic model are evidenced. The ground-state exciton is not a genuine Frenkel exciton, but a very localized tightly bound one. The other ones are similar to those found in transition-metal dichalcogenides and, although more localized, can be described within a Wannier-Mott scheme.
Disciplines :
Physics
Author, co-author :
Galvani, Thomas;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
PALEARI, Fulvio ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
PEREIRA COUTADA MIRANDA, Henrique ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
MOLINA-SANCHEZ, Alejandro ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
WIRTZ, Ludger ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Latil, Sylvain;  Université Paris-Saclay
Amara, Hakim;  ONERA-CNRS
Ducastelle, François;  ONERA-CNRS
External co-authors :
yes
Language :
English
Title :
Excitons in boron nitride single layer
Publication date :
06 September 2016
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
94
Issue :
125303
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR7490149 - 20 Electric Transport And Superconductivity In Transition Metal Dichalcogenides Nanolayers, 2013 (01/02/2014-31/01/2019) - Ludger Wirtz
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since 28 September 2016

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