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• W1818376650 abstract "The polarization analysis of optical transitions in monolayer and bilayer transition-metal dichalcogenides provides invaluable information on the spin and valley (pseudospin) degrees of freedom. To explain optical properties of a given monolayer transition-metal dichalcogenide, one should consider (i) the order of its spin-split conduction bands, (ii) whether intervalley scattering is prone to phonon bottleneck, (iii) and whether valley mixing by electron-hole exchange can take place. Using these principles, we present a consistent physical picture that elucidates a variety of features in the optical spectra of these materials. We explain the differences between optical transitions in monolayer MoSe$_2$ and monolayer WSe$_2$, finding that indirect excitons in the latter correspond to several low-energy optical transitions that so far were attributed to excitons bound to impurities. A possible mechanism that can explain the vanishing polarization in MoSe$_2$ is discussed. Finally, we consider the effect of an out-of-plane electric field, showing that it can reduce the initial polarization of bright excitons due to a Rashba-type coupling with dark excitons." @default.
• W1818376650 created "2016-06-24" @default.
• W1818376650 creator A5010287221 @default.
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• W1818376650 date "2015-09-23" @default.
• W1818376650 modified "2023-10-10" @default.
• W1818376650 title "Polarization analysis of excitons in monolayer and bilayer transition-metal dichalcogenides" @default.
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• W1818376650 doi "https://doi.org/10.1103/physrevb.92.125431" @default.
• W1818376650 hasPublicationYear "2015" @default.
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