Phonon-assisted oscillatory exciton dynamics in monolayer MoSe2

Chow, Colin M.; Yu, Hongyi; Jones, Aaron M.; Schaibley, John R.; Koehler, Michael; Mandrus, David G.; Merlin, R.; Yao, Wang; Xu, Xiaodong

doi:10.1038/s41699-017-0035-1

Phonon-assisted oscillatory exciton dynamics in monolayer MoSe₂

Journal Article · Fri Oct 13 00:00:00 EDT 2017 · npj 2D Materials and Applications

DOI:https://doi.org/10.1038/s41699-017-0035-1· OSTI ID:1432153

Chow, Colin M. ^[1]; Yu, Hongyi ^[2]; Jones, Aaron M. ^[1]; Schaibley, John R. ^[3]; Koehler, Michael ^[4]; Mandrus, David G. ^[5]; Merlin, R. ^[6]; Yao, Wang ^[2]; Xu, Xiaodong ^[7]

Univ. of Washington, Seattle, WA (United States). Dept. of Physics
Univ. of Hong Kong (China). Dept. of Physics. Center of Theoretical and Computational Physics
Univ. of Arizona, Tucson, AZ (United States). Dept. of Physics
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Univ. of Michigan, Ann Arbor, MI (United States). Center for Photonics and Multiscale Nanomaterials. Dept. of Physics
Univ. of Washington, Seattle, WA (United States). Dept. of Physics. Dept. of Materials Science and Engineering

In monolayer semiconductor transition metal dichalcogenides, the exciton–phonon interaction strongly affects the photocarrier dynamics. Here, we report on an unusual oscillatory enhancement of the neutral exciton photoluminescence with the excitation laser frequency in monolayer MoSe₂. The frequency of oscillation matches that of the M-point longitudinal acoustic phonon, LA(M), suggesting the significance of zone-edge acoustic phonons and hence the deformation potential in exciton-phonon coupling in MoSe₂. Moreover, oscillatory behavior is observed in the steady-state emission linewidth and in time-resolved PLE data, which reveals variation with excitation energy in the exciton lifetime. These results clearly expose the key role played by phonons in the exciton formation and relaxation dynamics of two-dimensional van der Waals semiconductors.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Hong Kong (China); Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: Croucher Foundation, Hong Kong (China); National Science Foundation (NSF) (United States); Research Grants Council (RGC), Hong Kong (China); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); University Grants Committee (UGC), Hong Kong (China)

Grant/Contract Number:: AC05-00OR22725; SC0008145; SC0012509

OSTI ID:: 1432153

Journal Information:: npj 2D Materials and Applications, Journal Name: npj 2D Materials and Applications Vol. 1; ISSN 2397-7132

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Direct band-gap crossover in epitaxial monolayer boron nitride Elias, C.; Valvin, P.; Pelini, T. Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-10610-5	journal	June 2019
Effect of Phonons on Valley Depolarization in Monolayer WSe2 Chellappan, Vijila; Pang, Ai Lin Christina; Sarkar, Soumya Electronic Materials Letters, Vol. 14, Issue 6 https://doi.org/10.1007/s13391-018-0086-2	journal	July 2018
Interlayer charge transport controlled by exciton–trion coherent coupling Kallatt, Sangeeth; Das, Sarthak; Chatterjee, Suman npj 2D Materials and Applications, Vol. 3, Issue 1 https://doi.org/10.1038/s41699-019-0097-3	journal	April 2019
Observation of exciton-phonon coupling in MoSe 2 monolayers Shree, S.; Semina, M.; Robert, C. Physical Review B, Vol. 98, Issue 3 https://doi.org/10.1103/physrevb.98.035302	journal	July 2018
Fundamental exciton linewidth broadening in monolayer transition metal dichalcogenides Gupta, Garima; Majumdar, Kausik Physical Review B, Vol. 99, Issue 8 https://doi.org/10.1103/physrevb.99.085412	journal	February 2019
Virtual Trions in the Photoluminescence of Monolayer Transition-Metal Dichalcogenides Van Tuan, Dinh; Jones, Aaron M.; Yang, Min Physical Review Letters, Vol. 122, Issue 21 https://doi.org/10.1103/physrevlett.122.217401	journal	May 2019
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Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides Van Tuan, Dinh; Jones, Aaron M.; Yang, Min arXiv https://doi.org/10.48550/arxiv.1805.08722	text	January 2018
Fundamental exciton linewidth broadening in monolayer transition metal dichalcogenides Gupta, Garima; Majumdar, Kausik arXiv https://doi.org/10.48550/arxiv.1901.04391	text	January 2019
Inter-layer charge transport controlled by exciton-trion coherent coupling Kallatt, Sangeeth; Das, Sarthak; Chatterjee, Suman arXiv https://doi.org/10.48550/arxiv.1903.06437	text	January 2019
Colloquium : Excitons in atomically thin transition metal dichalcogenides Wang, Gang; Chernikov, Alexey; Glazov, Mikhail M. Universität Regensburg https://doi.org/10.5283/epub.40518	text	January 2018

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