Optical Absorption by Dirac Excitons in Single-Layer Transition-Metal Dichalcogenides

Abstract

We develop an analytically solvable model able to qualitatively explain nonhydrogenic exciton spectra observed recently in two-dimensional (2d) semiconducting transition metal dichalcogenides. Our exciton Hamiltonian explicitly includes additional angular momentum associated with the pseudospin degree of freedom unavoidable in 2d semiconducting materials with honeycomb structure. We claim that this is the key ingredient for understanding the nonhydrogenic exciton spectra that was missing so far.

4+ pages, 2 figures

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Cited by in corpus (30)

• Excitons in atomically thin transition metal dichalcogenides
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Collective Excitations in 2D Materials
• Intrinsic exciton states mixing and non-linear optical properties in transition metal dichalcogenide monolayers
• Excitons and trions in monolayer transition metal dichalcogenides: A comparative study between the multiband model and the quadratic single-band model
• Exciton states in monolayer MoSe2 and MoTe2 probed by upconversion spectroscopy
• Exciton-polarons in doped semiconductors in a strong magnetic field
• Quantum Valley Hall Effect and Perfect Valley Filter Based on Photonic Analogs of Transitional Metal Dichalcogenides
• Model Prediction of Self-Rotating Excitons in Two-Dimensional Transition-Metal Dichalcogenides
• Strain-induced bound states in transition-metal dichalcogenide bubbles
• Quantum-electrodynamical approach to the exciton spectrum in Transition-Metal Dichalcogenides
• Charged exctions in two-dimensional transition-metal dichalcogenides - semiclassical calculation of Berry-curvature effects
• Exciton oscillator strength in two-dimensional Dirac materials
• Quantum Geometric Exciton Drift Velocity
• Excitonic theory of doping-dependent optical response in atomically thin semiconductors
• Can freestanding Xene monolayers behave as excitonic insulators?
• Two-electron bound states near a Coulomb impurity in gapped graphene
• 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
• Spin Response and Collective Modes in Simple Metal Dichalcogenides
• Anomalous energy shift of laterally confined two-dimensional excitons
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Quantum Internal Structure of Plasmons
• Sommerfeld enhancement factor in two-dimensional Dirac materials
• Exciton spectrum in two-dimensional transition metal dichalcogenides: The role of Diracness
• Long-lived Nonlinear Oscillatory States in Interacting Relativistic Bose-Einstein Condensates
• Bosonic interactions in a nonlocal theory in (2+1) dimensions
• Magnetoexcitons and Massive Dirac Fermions in Monolayers of Transition Metal Dichalcogenides in a High Magnetic Field
• Semiclassical approach for excitonic spectrum of Coulomb coupling between two Dirac particles