Exciton–phonon coupling strength in single-layer MoSe2 at room temperature

Single-layer transition metal dichalcogenides are at the center of an ever increasing research effort both in terms of fundamental physics and applications. Exciton–phonon coupling plays a key role in determining the (opto)electronic properties of these materials. However, the exciton–phonon couplin...

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Bibliographic Details
Published in:Nature communications 2021-02, Vol.12 (1), p.1-9, Article 954
Main Authors: Li, Donghai, Trovatello, Chiara, Dal Conte, Stefano, Nuß, Matthias, Soavi, Giancarlo, Wang, Gang, Ferrari, Andrea C., Cerullo, Giulio, Brixner, Tobias
Format: Article
Language:English
Subjects:
140/125
639/624/1107/527/1819
639/925/357/1018
Coupling
Design parameters
Electronics industry
Excitation spectra
Excitons
Humanities and Social Sciences
Molybdenum compounds
multidisciplinary
Optoelectronic devices
Phonons
Room temperature
Science
Science (multidisciplinary)
Spatial discrimination
Spatial resolution
Spectroscopy
Spectrum analysis
Transition metal compounds
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Summary:Single-layer transition metal dichalcogenides are at the center of an ever increasing research effort both in terms of fundamental physics and applications. Exciton–phonon coupling plays a key role in determining the (opto)electronic properties of these materials. However, the exciton–phonon coupling strength has not been measured at room temperature. Here, we use two-dimensional micro-spectroscopy to determine exciton–phonon coupling of single-layer MoSe 2 . We detect beating signals as a function of waiting time induced by the coupling between A excitons and A ′ 1 optical phonons. Analysis of beating maps combined with simulations provides the exciton–phonon coupling. We get a Huang–Rhys factor ~1, larger than in most other inorganic semiconductor nanostructures. Our technique offers a unique tool to measure exciton–phonon coupling also in other heterogeneous semiconducting systems, with a spatial resolution ~260 nm, and provides design-relevant parameters for the development of optoelectronic devices. The exciton–phonon coupling (EXPC) affects the opto-electronic properties of atomically thin semiconductors. Here, the authors develop two-dimensional micro-spectroscopy to determine the EXPC of monolayer MoSe 2 .
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-20895-0