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Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe2, MoSe2 and MoTe2

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cris.lastimport.scopus2024-02-12T19:47:06Z
dc.abstract.enMonolayers and multilayers of semiconducting transition metal dichalcogenides (TMDCs) offer an ideal platform to explore valley-selective physics with promising applications in valleytronics and information processing. Here we manipulate the energetic degeneracy of the K+ and K-valleys in few-layer TMDCs. We perform high-field magneto-reflectance spectroscopy on WSe2, MoSe2, and MoTe2 crystals of thickness from monolayer to the bulk limit under magnetic fields up to 30 T applied perpendicular to the sample plane. Because of a strong spin-layer locking, the ground state A excitons exhibit a monolayer-like valley Zeeman splitting with a negative g-factor, whose magnitude increases monotonically when crystal thickness decreases from bulk to a monolayer. Using kp calculations, we demonstrate that the observed dependence of g-factors for different materials is well accounted for by hybridization of electronic states in the K+ and K-valleys. The mixing of the valence and conduction band states induced by the interlayer interaction decreases the g-factor with increasing layer number. The effect is the largest for MoTe2, followed by MoSe2, and the smallest for WSe2.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPotemski, Marek
dc.contributor.authorKoperski, Maciej
dc.contributor.authorVasconcellos, Steffen Michaelis de
dc.contributor.authorSchmidt, Robert
dc.contributor.authorSchneider, Robert
dc.contributor.authorArora, Ashish
dc.contributor.authorSlobodeniuk, Artur
dc.contributor.authorBratschitsch, Rudolf
dc.contributor.authorMolas, Maciej
dc.contributor.authorNogajewski, Karol
dc.date.accessioned2024-01-26T12:19:38Z
dc.date.available2024-01-26T12:19:38Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.identifier.doi10.1088/2053-1583/AAE7E5
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/125898
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartof2D Materials
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleZeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe2, MoSe2 and MoTe2
dc.typeJournalArticle
dspace.entity.typePublication