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Conference Paper: Coherent quantum dynamics of excitons in monolayer transition metal dichalcogenides

TitleCoherent quantum dynamics of excitons in monolayer transition metal dichalcogenides
Authors
KeywordsHomoge- neous Linewidth
Multi-Dimensional Coherent Spectroscopy
Exciton
Transition Metal Dichalcogenides
Issue Date2016
Citation
Proceedings of SPIE - The International Society for Optical Engineering, 2016, v. 9746, article no. 97461T How to Cite?
AbstractTransition metal dichalcogenides (TMDs) have garnered considerable interest in recent years owing to their layer thickness-dependent optoelectronic properties. In monolayer TMDs, the large carrier effective masses, strong quantum confinement, and reduced dielectric screening lead to pronounced exciton resonances with remarkably large binding energies and coupled spin and valley degrees of freedom (valley excitons). Coherent control of valley excitons for atomically thin optoelectronics and valleytronics requires understanding and quantifying sources of exciton decoherence. In this work, we reveal how exciton-exciton and exciton-phonon scattering influence the coherent quantum dynamics of valley excitons in monolayer TMDs, specifically tungsten diselenide (WSe ), using two-dimensional coherent spectroscopy. Excitation-density and temperature dependent measurements of the homogeneous linewidth (inversely proportional to the optical coherence time) reveal that exciton-exciton and exciton-phonon interactions are significantly stronger compared to quasi-2D quantum wells and 3D bulk materials. The residual homogeneous linewidth extrapolated to zero excitation density and temperature is ∼1:6 meV (equivalent to a coherence time of 0.4 ps), which is limited only by the population recombination lifetime in this sample. 2
Persistent Identifierhttp://hdl.handle.net/10722/298443
ISSN
2020 SCImago Journal Rankings: 0.192
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorMoody, Galan-
dc.contributor.authorHao, Kai-
dc.contributor.authorDass, Chandriker Kavir-
dc.contributor.authorSingh, Akshay-
dc.contributor.authorXu, Lixiang-
dc.contributor.authorTran, Kha-
dc.contributor.authorChen, Chang Hsiao-
dc.contributor.authorLi, Ming Yang-
dc.contributor.authorLi, Lain Jong-
dc.contributor.authorClark, Genevieve-
dc.contributor.authorBerghäuser, Gunnar-
dc.contributor.authorMalic, Ermin-
dc.contributor.authorKnorr, Andreas-
dc.contributor.authorXu, Xiaodong-
dc.contributor.authorLi, Xiaoqin-
dc.date.accessioned2021-04-08T03:08:25Z-
dc.date.available2021-04-08T03:08:25Z-
dc.date.issued2016-
dc.identifier.citationProceedings of SPIE - The International Society for Optical Engineering, 2016, v. 9746, article no. 97461T-
dc.identifier.issn0277-786X-
dc.identifier.urihttp://hdl.handle.net/10722/298443-
dc.description.abstractTransition metal dichalcogenides (TMDs) have garnered considerable interest in recent years owing to their layer thickness-dependent optoelectronic properties. In monolayer TMDs, the large carrier effective masses, strong quantum confinement, and reduced dielectric screening lead to pronounced exciton resonances with remarkably large binding energies and coupled spin and valley degrees of freedom (valley excitons). Coherent control of valley excitons for atomically thin optoelectronics and valleytronics requires understanding and quantifying sources of exciton decoherence. In this work, we reveal how exciton-exciton and exciton-phonon scattering influence the coherent quantum dynamics of valley excitons in monolayer TMDs, specifically tungsten diselenide (WSe ), using two-dimensional coherent spectroscopy. Excitation-density and temperature dependent measurements of the homogeneous linewidth (inversely proportional to the optical coherence time) reveal that exciton-exciton and exciton-phonon interactions are significantly stronger compared to quasi-2D quantum wells and 3D bulk materials. The residual homogeneous linewidth extrapolated to zero excitation density and temperature is ∼1:6 meV (equivalent to a coherence time of 0.4 ps), which is limited only by the population recombination lifetime in this sample. 2-
dc.languageeng-
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineering-
dc.subjectHomoge- neous Linewidth-
dc.subjectMulti-Dimensional Coherent Spectroscopy-
dc.subjectExciton-
dc.subjectTransition Metal Dichalcogenides-
dc.titleCoherent quantum dynamics of excitons in monolayer transition metal dichalcogenides-
dc.typeConference_Paper-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1117/12.2209203-
dc.identifier.scopuseid_2-s2.0-84981303382-
dc.identifier.volume9746-
dc.identifier.spagearticle no. 97461T-
dc.identifier.epagearticle no. 97461T-
dc.identifier.eissn1996-756X-
dc.identifier.isiWOS:000380588700023-
dc.identifier.issnl0277-786X-

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