Ultrafast valley-selective coherent optical manipulation with excitons in WSe2 and MoS2 monolayers

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dc.contributor.authorSlobodeniuk, Arturcs
dc.contributor.authorKoutenský, Petrcs
dc.contributor.authorBartoš, Miroslavcs
dc.contributor.authorTrojánek, Františekcs
dc.contributor.authorMalý, Petrcs
dc.contributor.authorNovotný, Tomášcs
dc.contributor.authorKozák, Martincs
dc.coverage.issue1cs
dc.coverage.volume7cs
dc.date.issued2023-03-25cs
dc.description.abstractIncreasing the speed limits of conventional electronics requires innovative approaches to manipulate other quantum properties of electrons besides their charge. An alternative approach utilizes the valley degree of freedom in low-dimensional semiconductors. Here we demonstrate that the valley degeneracy of exciton energies in transition metal dichalcogenide monolayers may be lifted by coherent optical interactions on timescales corresponding to few tens of femtoseconds. The optical Stark and Bloch-Siegert effects generated by strong nonresonant circularly-polarized light induce valley-selective blue shifts of exciton quantum levels by more than 30 meV. We show these phenomena by studying the two most intensive exciton resonances in transiton metal dichalcogenide monolayers and compare the results to a theoretical model, which properly includes the Coulomb interaction and exciton dispersion. These results open the door for ultrafast valleytronics working at multiterahertz frequencies.en
dc.formattextcs
dc.format.extent1-7cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationnpj 2D Materials and Applications. 2023, vol. 7, issue 1, p. 1-7.en
dc.identifier.doi10.1038/s41699-023-00385-1cs
dc.identifier.issn2397-7132cs
dc.identifier.orcid0000-0002-5923-0260cs
dc.identifier.other184143cs
dc.identifier.researcheridB-3350-2014cs
dc.identifier.urihttp://hdl.handle.net/11012/213679
dc.language.isoencs
dc.publisherSpringer Naturecs
dc.relation.ispartofnpj 2D Materials and Applicationscs
dc.relation.urihttps://www.nature.com/articles/s41699-023-00385-1cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2397-7132/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectGENERATIONen
dc.subjectPOLARIZATIONen
dc.subjectFIELDen
dc.titleUltrafast valley-selective coherent optical manipulation with excitons in WSe2 and MoS2 monolayersen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-184143en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:50:52en
sync.item.modts2025.01.17 16:46:43en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Magneto-Optická a THz Spektroskopiecs
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