Optical fingerprint of dark 2p-states in transition metal dichalcogenides

Abstract

We present a microscopic study on higher excitonic states in transition metal dichalcogenides in the presence of disorder. We show that the geometric phase cancels the degeneration of 2s and 2p states and that a significant disorder-induced coupling of bright and dark states offers a strategy to circumvent optical selection rules. As a prove, we show a direct fingerprint of dark 2p states in absorption spectra of WS${}_2$. The predicted softening of optical selection rules through exciton-disorder coupling is of general nature and therefore applicable to related two-dimensional semiconductors.

References in corpus (6)

• Tightly bound excitons in monolayer WSe2
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• Non-linear Optical Spectroscopy of Excited Exciton States for Efficient Valley Coherence Generation in WSe2 Monolayers
• Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
• Exciton band structure of monolayer MoS2
• Exciton Valley Dynamics probed by Kerr Rotation in WSe2 Monolayers

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• Exciton optics, dynamics and transport in atomically thin semiconductors
• Mapping of the dark exciton landscape in transition metal dichalcogenides
• Autoionization and dressing of excited excitons by free carriers in monolayer WSe2
• Microscopic picture of electron-phonon interaction in two-dimensional halide perovskites
• On the Optical Properties of Excitons in Buckled 2D Materials in an External Electric Field
• Quenching of Intervalley Exchange Coupling in the Presence of Momentum-Dark States in TMDCs
• Charged exctions in two-dimensional transition-metal dichalcogenides - semiclassical calculation of Berry-curvature effects
• In-Plane Electric Field Induced Orbital Hybridization of Excitonic States In Monolayer WSe2
• Microscopic theory of the polarizability of transition metal dichalcogenides excitons: Application to WSe2
• Third-order polarizability of interlayer excitons in hetero-bilayers
• Wannier Excitons Confined in Hexagonal Boron Nitride Triangular Quantum Dots
• Tracking the photoinduced dynamics of a dark excitonic state in single-layer WS${}_2$ via resonant Autler-Townes splitting