Model Prediction of Self-Rotating Excitons in Two-Dimensional Transition-Metal Dichalcogenides

Abstract

Using the quasiclassical concept of Berry curvature we demonstrate that a Dirac exciton - a pair of Dirac quasiparticles bound by Coulomb interactions - inevitably possesses an intrinsic angular momentum making the exciton effectively self-rotating. The model is applied to excitons in two-dimensional transition metal dichalcogenides, in which the charge carriers are known to be described by a Dirac-like Hamiltonian. We show that the topological self-rotation strongly modifies the exciton spectrum and, as a consequence, resolves the puzzle of the overestimated two-dimensional polarizability employed to fit earlier spectroscopic measurements.

4+ pages, 2 figures, suppl. mat. added (4 pages), the title changed by PRL editors

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• Dirac materials
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Cited by in corpus (22)

• Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
• Collective Excitations in 2D Materials
• Valley-dependent Exciton Fine Structure and Autler-Townes Doublets from Berry Phases in Monolayer Molybdenum Diselenide
• On the Optical Properties of Excitons in Buckled 2D Materials in an External Electric Field
• Band nesting and exciton spectrum in monolayer MoS${}_2$
• Skew Scattering and Side Jump Drive Exciton Valley Hall Effect in Two-Dimensional Crystals
• Spherical topological-insulator nanoparticles: Quantum size effects and optical transitions
• Charged exctions in two-dimensional transition-metal dichalcogenides - semiclassical calculation of Berry-curvature effects
• The effect of valley, spin and band nesting on the electronic properties of gated quantum dots in a single layer of transition metal dichalcogenides (TMDCs)
• Exciton oscillator strength in two-dimensional Dirac materials
• Quantum Geometric Exciton Drift Velocity
• Tightly bound excitons in two-dimensional semiconductors with a flat valence band
• Excitonic theory of doping-dependent optical response in atomically thin semiconductors
• Role of the Berry curvature on BCS-type superconductivity in two-dimensional materials
• Fingerprints of Berry phases in the bulk exciton spectrum of a topological insulator
• Coulomb effects in the absorbance spectra of two-dimensional Dirac materials
• Inheritance of the exciton geometric structure from Bloch electrons in two-dimensional layered semiconductors
• Excitons and trions with negative effective masses in two-dimensional semiconductors
• Quantum Internal Structure of Plasmons
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Hybrid dark excitons in monolayer ${MoS}_2$
• Landau-level composition of bound exciton states in magnetic field