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• W2963865643 abstract "The geometry of electronic bands in a solid can drastically alter single-particle charge and spin transport. We show here that collective optical excitations arising from Coulomb interactions also exhibit unique signatures of Berry curvature and quantum geometric tensor. A nonzero Berry curvature mixes and lifts the degeneracy of l≠0 states, leading to a time-reversal-symmetric analog of the orbital Zeeman effect. The quantum geometric tensor, on the other hand, leads to l-dependent shifts of exciton states that is analogous to the Lamb shift. Our results provide an explanation for the nonhydrogenic exciton spectrum recently calculated for transition-metal dichalcogenides. Numerically, we find a Berry curvature induced splitting of ∼10 meV between the 2px±i2py states of WSe2." @default.
• W2963865643 created "2019-07-30" @default.
• W2963865643 creator A5008938191 @default.
• W2963865643 creator A5050940255 @default.
• W2963865643 date "2015-10-16" @default.
• W2963865643 modified "2023-10-14" @default.
• W2963865643 title "Signatures of Bloch-Band Geometry on Excitons: Nonhydrogenic Spectra in Transition-Metal Dichalcogenides" @default.
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• W2963865643 doi "https://doi.org/10.1103/physrevlett.115.166802" @default.
• W2963865643 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26550892" @default.
• W2963865643 hasPublicationYear "2015" @default.
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