Brightening odd-parity excitons in transition-metal dichalcogenides: Rashba spin-orbit interaction, skyrmions, and cavity polaritons

Abstract

Odd-angular momentum exciton states are dark to light in monolayers of transition-metal dichalcogenides and can be addressed only by two-photon probes. Besides, $2p$ excitons states are expected to show a fine splitting that arises from the peculiar electronic band structure of the material, characterized by a finite Berry curvature around each valley. In this work we study in detail the coupling of photons to $p$ exciton states and we find that the Rashba spin-orbit interaction or a Skyrmion in the transition-metal dichalcogenide substrate can be exploited to engineer finite optical selection rules. The basis mechanism relies on a matching of the exciton angular momentum with the winding of the Rashba spin-orbit interaction or the Skyrmion topological charge. In a photonic cavity, the coupling is enhanced due to photon confinement and the resulting polaritonic branches acquire a mixing with $2p^{\pm }$ excitons, thus providing a useful tool to detect exciton fine-splitting and and enable novel uses of odd-parity dark excitons.

arXiv comment11 pages, 8 figures

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Cited by in corpus (4)

• In-Plane Electric Field Induced Orbital Hybridization of Excitonic States In Monolayer WSe2
• Microscopic theory of cavity-confined monolayer semiconductors: polariton-induced valley relaxation and the prospect of enhancing and controlling the valley pseudospin by chiral strong coupling
• Emergent bright excitons with Rashba spin-orbit coupling in atomic monolayers
• Tunable resonant s-p mixing of excitons in van der Waals heterostructures