Observation of Rydberg moiré excitons

Abstract

Rydberg excitons, the solid-state counterparts of Rydberg atoms, have sparked considerable interest in harnessing their quantum application potentials, whereas a major challenge is realizing their spatial confinement and manipulation. Lately, the rise of two-dimensional moiré superlattices with highly tunable periodic potentials provides a possible pathway. Here, we experimentally demonstrate this capability through the observation of Rydberg moiré excitons (XRM), which are moiré trapped Rydberg excitons in monolayer semiconductor WSe2 adjacent to twisted bilayer graphene. In the strong coupling regime, the XRM manifest as multiple energy splittings, pronounced redshift, and narrowed linewidth in the reflectance spectra, highlighting their charge-transfer character where electron-hole separation is enforced by the strongly asymmetric interlayer Coulomb interactions. Our findings pave the way for pursuing novel physics and quantum technology exploitation based on the excitonic Rydberg states.

24 pages, including 4 figures and 6 supplementary figures

References in corpus (13)

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Cited by in corpus (10)

• Observation of Rydberg moiré excitons
• Coupled exciton internal and center-of-mass motions in two-dimensional semiconductors by a periodic electrostatic potential
• Designing Band Structures by Patterned Dielectric Superlattices
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Interlayer Fermi polarons of excited exciton states in quantizing magnetic fields
• Electrically tunable and enhanced nonlinearity of moiré exciton-polaritons in transition metal dichalcogenide bilayers
• Review of the tight-binding method applicable to the properties of moiré superlattices
• Engineering topological exciton structures in two-dimensional semiconductors by a periodic electrostatic potential
• Electronic phonon-induced magnetism in moiré Mott-Wigner crystals
• Interaction effects on electronic Floquet spectra: Excitonic effects