Article (Scientific journals)
Excitons in a mirror: Formation of “optical bilayers” using MoS2 monolayers on gold substrates
Mertens, Jan; Shi, Yumeng; Molina-Sanchez, Alejandro et al.
2014In Applied Physics Letters, 104, p. 191105
Peer reviewed
 

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Abstract :
[en] We report coupling of excitons in monolayers of molybdenum disulphide to their mirror image in an underlying gold substrate. Excitons at the direct band gap are little affected by the substrate whereas strongly bound C-excitons associated with a van-Hove singularity change drastically. On quartz substrates only one C-exciton is visible (in the blue) but on gold substrates a strong red-shifted extra resonance in the green is seen. Exciton coupling to its image leads to formation of a “mirror biexciton” with enhanced binding energy. Estimates of this energy shift in an emitter-gold system match experiments well. The absorption spectrum of MoS2 on gold thus resembles a bilayer of MoS2 which has been created by optical coupling. Additional top-mirrors produce an “optical bulk.”
Disciplines :
Physics
Author, co-author :
Mertens, Jan;  University of Cambridge > Nanophotonics Centre, Cavendish Laboratory
Shi, Yumeng;  Singapore University of Technology and Design > Pillar of Engineering Product Development
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
Ying Yang, Hui;  Singapore University of Technology and Design > Pillar of Engineering Product Development
Baumberg, Jeremy J.;  University of Cambridge > Nanophotonics Centre, Cavendish Laboratory
Language :
English
Title :
Excitons in a mirror: Formation of “optical bilayers” using MoS2 monolayers on gold substrates
Publication date :
May 2014
Journal title :
Applied Physics Letters
ISSN :
0003-6951
Publisher :
American Institute of Physics, Melville, United States - New York
Volume :
104
Pages :
191105
Peer reviewed :
Peer reviewed
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since 26 May 2014

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