Vibronically Coherent Exciton Trapping in Monolayer WS

Yorrick Boeije, Anh Tuan Hoang, Juhwan Lim, Samuel D Stranks, Manish Chhowalla, Eric Pop, Andrew J Mannix, Akshay Rao

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Article in ACS nano, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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8 authors.

Yorrick BoeijeDepartment of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, U.K.ORCID 0000-0002-4346-3123

Anh Tuan HoangDepartment of Materials Science & Engineering, Stanford University, Stanford, California 94305, United States.ORCID 0000-0003-0911-1391

Juhwan LimDepartment of Physics, Cavendish Laboratory, University of Cambridge; Cambridge CB3 0HE, U.K.

Samuel D StranksDepartment of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, U.K.ORCID 0000-0002-8303-7292

Manish ChhowallaDepartment of Materials Science & Metallurgy, University of Cambridge; Cambridge CB3 0FS, U.K.ORCID 0000-0002-8183-4044

Eric PopDepartment of Materials Science & Engineering, Stanford University, Stanford, California 94305, United States.ORCID 0000-0003-0436-8534

Andrew J MannixDepartment of Materials Science & Engineering, Stanford University, Stanford, California 94305, United States.ORCID 0000-0003-4788-1506

Akshay RaoDepartment of Physics, Cavendish Laboratory, University of Cambridge; Cambridge CB3 0HE, U.K.ORCID 0000-0003-4261-0766

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Defect engineering in transition metal dichalcogenide (TMD) monolayers enables applications in single-photon emission, sensing, and photocatalysis. These functionalities critically depend on defect type, density, spatial distribution, relative energy, and the dynamics of exciton trapping at the defect sites. The latter are mediated by coupling to optical phonons through mechanisms not yet fully understood. Traditionally, exciton or carrier trapping at defects in inorganic crystals has been described by incoherent multiphonon emission within the Born-Oppenheimer approximation─an approach that underpins the widely used Shockley-Read-Hall framework for nonradiative recombination. Here, we use impulsive vibrational spectroscopy to investigate exciton trapping in defect-modified monolayers of WS

Indexed as

conical intersectionsdefect engineeringdefect photophysicsexciton−phonon couplingexciton trappingtransition metal dichalcogenide defectsvibronic coherence

Identifiers

PMID40686386

DOI10.1021/acsnano.5c08533

PMCPMC12312154

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