Ultrafast control of the optical transition in type-II colloidal quantum wells

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage1258
dc.citation.issueNumber5
dc.citation.spage1250
dc.citation.volumeNumber10
dc.contributor.authorYu, J.
dc.contributor.authorDurmusoglu, E. G.
dc.contributor.authorWang, Y.
dc.contributor.authorSharma, M.
dc.contributor.authorDemir, Hilmi Volkan
dc.contributor.authorDang, C.
dc.date.accessioned2024-03-20T14:03:30Z
dc.date.available2024-03-20T14:03:30Z
dc.date.issued2023-04-21
dc.departmentDepartment of Electrical and Electronics Engineering
dc.departmentDepartment of Physics
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)
dc.description.abstractManipulating the optical transition in semiconductors at ultrashort timescales is of both fundamental interest and central importance for emerging photonic applications. Traditionally, this manipulation is realized by electrostatic gating via Stark effects or band-gap renormalizations. Here, we report an ultrafast and all-optical route to engineer an indirect transition in core–crown colloidal quantum wells (CQWs), namely, CdSe/CdTe, with a type-II band alignment. Following the intense laser pulse excitation, the indirect band transition energy exhibits a pronounced blueshift–redshift crossover on the picosecond timescale, stemming from the formation and dissipation of the transient electric field (E-field) that forms upon photoexcitation to compensate for the driving force provided by the band offsets. Both the energy shift and dynamics of the transient E-field can be modulated optically by tuning the laser pulse excitation fluence. Our finding demonstrates a strong analogy between the type-II heterojunction and a p–n junction with respect to carrier equilibrium processes, which holds promise to facilitate the integration of CQWs within optical switching networks.
dc.embargo.release2024-04-21
dc.identifier.doi10.1021/acsphotonics.2c01799
dc.identifier.eissn2330-4022
dc.identifier.urihttps://hdl.handle.net/11693/115025
dc.language.isoen_US
dc.publisherAmerican Chemical Society
dc.relation.isversionofhttps://dx.doi.org/10.1021/acsphotonics.2c01799
dc.rightsCC BY-NC-ND 4.0 Deed (Attribution-NonCommercial-NoDerivs 4.0 International)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.source.titleACS Photonics
dc.subjectColloidal quantum wells
dc.subjectType-II heterojunction
dc.subjectUltrafast spectroscopy
dc.subjectOptical modulation
dc.subjectCdSe/CdTe
dc.titleUltrafast control of the optical transition in type-II colloidal quantum wells
dc.typeArticle
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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)