Ultrafast Carrier Dynamics of Monolayer WS2 via Broad-Band Time-Resolved Terahertz Spectroscopy

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dc.contributor.authorGustafson, Jon K.
dc.contributor.authorCunningham, Paul D.
dc.contributor.authorMcCreary, Kathleen M.
dc.contributor.authorJonker, Berend T.
dc.contributor.authorHayden, L. Michael
dc.date.accessioned2020-01-30T17:57:41Z
dc.date.available2020-01-30T17:57:41Z
dc.date.issued2019-11-19
dc.description.abstractWe report on the ultrafast carrier dynamics of monolayer WS2 using broad-band time-resolved terahertz spectroscopy (TRTS). We find that upon photoexcitation, there is an increase in the conductivity. We attribute this photoinduced increase in conductivity to ultrafast positive trion formation. Trion formation in two-dimensional materials is a consequence of the enhanced Coulombic interactions between electrons and holes. We find that trions in monolayer WS2 contribute to the photoconductivity in three ways: a Drude response, a broad resonance response, and a dissociation response at the trion binding energy. This is the first direct measurement of the trion binding energy in the far-infrared. Our results provide a comprehensive understanding of how trions behave in two-dimensional systems and should be broadly useful in studying the carrier dynamics of other two-dimensional systems.en
dc.description.sponsorshipJ.K.G. acknowledges the support of the Department of Education through a GAANN Fellowship under award number P200A150003-17. P.D.C., K.M.M., and B.T.J. acknowledge support by the Office of Naval Research through core programs at the U.S. Naval Research Laboratory (NRL) and the NRL Nanoscience Institute.en
dc.description.urihttps://pubs.acs.org/doi/10.1021/acs.jpcc.9b08483en
dc.format.extent8 pagesen
dc.genrejournal articlesen
dc.identifierdoi:10.13016/m2mrrz-rtto
dc.identifier.citationGustafson, Jon K.; Cunningham, Paul D.; McCreary, Kathleen M.; Jonker, Berend T.; Hayden, L. Michael; Ultrafast Carrier Dynamics of Monolayer WS2 via Broad-Band Time-Resolved Terahertz Spectroscopy; The Journal of Physical Chemistry 123, 50, 30676-30683 (2019); https://pubs.acs.org/doi/10.1021/acs.jpcc.9b08483en
dc.identifier.urihttp://hdl.handle.net/11603/17194
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Student Collection
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.subjectexcitonsen
dc.subjectphotonicsen
dc.subjectabsorptionen
dc.subjectmonolayersen
dc.subjectelectrical conductivityen
dc.titleUltrafast Carrier Dynamics of Monolayer WS2 via Broad-Band Time-Resolved Terahertz Spectroscopyen
dc.typeTexten

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