Reference : Excitons in a mirror: Formation of “optical bilayers” using MoS2 monolayers on gold s...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/16848

Title :	Excitons in a mirror: Formation of “optical bilayers” using MoS2 monolayers on gold substrates
Language :	English
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]
Publication date :	May-2014
Journal title :	Applied Physics Letters
Publisher :	American Institute of Physics
Volume :	104
Pages :	191105
Peer reviewed :	Yes (verified by ORBilu)
Audience :	International
ISSN :	0003-6951
City :	Melville
Country :	NY
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.”
Permalink :	http://hdl.handle.net/10993/16848
DOI :	10.1063/1.4876475
Other URL :	http://dx.doi.org/10.1063/1.4876475

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