Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2

Abstract

We observe a set of three replica luminescent peaks at ~21.4 meV below the dark exciton, negative and positive dark trions (or exciton-polarons) in monolayer WSe2. The replica redshift energy matches the energy of the zone-center E"-mode optical phonons. The phonon replicas exhibit parallel gate dependence and same g-factors as the dark excitonic states, but follow the valley selection rules of the bright excitonic states. While the dark states exhibit out-of-plane transition dipole and valley-independent linearly polarized emission in the in-plane directions, their phonon replicas exhibit in-plane transition dipole and valley-dependent circularly polarized emission in the out-of-plane directions. Our results and symmetry analysis show that the K-valley dark exciton decays into a left-handed chiral phonon and a right-handed photon, whereas the K'-valley dark exciton decays into a right-handed chiral phonon and a left-handed photon. Such valley selection rules of chiral phonon replicas can be utilized to identify the valleys of the dark excitonic states and explore their chiral interactions with phonons.

arXiv comment37 pages, 5 figures

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• Phonon-assisted Photoluminescence from Dark Excitons in Monolayers of Transition Metal Dichalcogenides
• Large effective magnetic fields from chiral phonons in rare-earth halides
• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Exciton g-factors in monolayer and bilayer WSe${}_2$ from experiment and theory
• Strain control of hybridization between dark and localized excitons in a 2D semiconductor
• Probing dark exciton navigation through a local strain landscape in a WSe${}_2$ monolayer
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• Valley Zeeman effect and Landau levels in Two-Dimensional Transition Metal Dichalcogenides
• Excitonic complexes in $n$-doped WS${}_2$ monolayer
• Intrinsic Donor-Bound Excitons in Ultraclean Monolayer Semiconductors
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe${}_2$
• Landau-quantized excitonic absorption and luminescence in a monolayer valley semiconductor
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• Flipping exciton angular momentum with chiral phonons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Temporal evolution of low-temperature phonon sidebands in WSe${}_2$ monolayers
• Spatially indirect intervalley excitons in bilayer WSe2
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Chiral valley phonons and flat phonon bands in moiré materials
• Interplay of Excitonic Complexes in $p$-Doped WSe${}_2$ Monolayers
• Interlayer exciton-polaron in atomically thin semiconductors
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Exciton-activated effective phonon magnetic moment in monolayer MoS2
• Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation
• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
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• Supercurrent-induced phonon angular momentum
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