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Detection of thermodynamic "valley noise'' in monolayer semiconductors: Access to intrinsic valley relaxation time scales

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dc.abstract.enTogether with charge and spin, many novel two-dimensional materials also permit information to be encoded in an electron's valley degree of freedom-that is, in particular momentum states in the material's Brillouin zone. With a view toward valley-based (opto) electronic technologies, the intrinsic time scales of valley scattering are therefore of fundamental interest. Here, we demonstrate an entirely noise-based approach for exploring valley dynamics in monolayer transition-metal dichalcogenide semiconductors. Exploiting their valley-specific optical selection rules, we use optical Faraday rotation to passively detect the thermodynamic fluctuations of valley polarization in a Fermi sea of resident carriers. This spontaneous ``valley noise'' reveals narrow Lorentzian line shapes and, therefore, long exponentially-decaying intrinsic valley relaxation. Moreover, the noise signatures validate both the relaxation times and the spectral dependence of conventional (perturbative) pump-probe measurements. These results provide a viable route toward quantitative measurements of intrinsic valley dynamics, free from any external perturbation, pumping, or excitation.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWilson, N. P.
dc.contributor.authorGoryca, Mateusz
dc.contributor.authorXu, X.
dc.contributor.authorDey, P.
dc.contributor.authorCrooker, S. A.
dc.date.accessioned2024-01-24T21:37:04Z
dc.date.available2024-01-24T21:37:04Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.identifier.doi10.1126/SCIADV.AAU4899
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/104644
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofScience Advances
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleDetection of thermodynamic "valley noise'' in monolayer semiconductors: Access to intrinsic valley relaxation time scales
dc.typeJournalArticle
dspace.entity.typePublication