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

Jan Mertens; Yumeng Shi; Alejandro Molina-Sánchez; Ludger Wirtz; Hui Ying Yang; Jeremy J. Baumberg

doi:10.1063/1.4876475

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

Jan Mertens, Yumeng Shi, Alejandro Molina-Sánchez, Ludger Wirtz, Hui Ying Yang, Jeremy J. Baumberg

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

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."

Original language	English (US)
Article number	191105
Journal	Applied Physics Letters
Volume	104
Issue number	19
DOIs	https://doi.org/10.1063/1.4876475
State	Published - May 12 2014
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "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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T2 - Formation of "optical bilayers" using MoS2 monolayers on gold substrates

AU - Mertens, Jan

AU - Shi, Yumeng

AU - Molina-Sánchez, Alejandro

AU - Wirtz, Ludger

AU - Yang, Hui Ying

AU - Baumberg, Jeremy J.

PY - 2014/5/12

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N2 - 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."

AB - 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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Excitons in a mirror: Formation of "optical bilayers" using MoS₂ monolayers on gold substrates

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