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_US
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_US
dc.description.urihttps://pubs.acs.org/doi/10.1021/acs.jpcc.9b08483en_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
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_US
dc.identifier.urihttp://hdl.handle.net/11603/17194
dc.language.isoen_USen_US
dc.publisherAmerican Chemical Societyen_US
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.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.rightsPublic Domain Mark 1.0*
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_US
dc.subjectphotonicsen_US
dc.subjectabsorptionen_US
dc.subjectmonolayersen_US
dc.subjectelectrical conductivityen_US
dc.titleUltrafast Carrier Dynamics of Monolayer WS2 via Broad-Band Time-Resolved Terahertz Spectroscopyen_US
dc.typeTexten_US

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