Excitons in a mirror: Formation of “optical bilayers” using MoS2 monolayers on gold substrates | Zendy

Jan Mertens | Zendy; Yumeng Shi | Zendy; Alejandro MolinaSánchez | Zendy; Ludger Wirtz | Zendy; Hui Ying Yang | Zendy; Jeremy J. Baumberg | Zendy

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

Author(s) -

Jan Mertens,

Yumeng Shi,

Alejandro MolinaSánchez,

Ludger Wirtz,

Hui Ying Yang,

Jeremy J. Baumberg

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4876475

Subject(s) - exciton , monolayer , bilayer , substrate (aquarium) , van hove singularity , materials science , binding energy , biexciton , optoelectronics , molecular physics , chemistry , condensed matter physics , nanotechnology , atomic physics , physics , fermi level , biochemistry , oceanography , quantum mechanics , membrane , geology , electron

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.

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