Probing and manipulating valley coherence of dark excitons in monolayer WSe${}_2$

Abstract

Monolayers of semiconducting transition metal dichalcogenides are two-dimensional direct-gap systems which host tightly-bound excitons with an internal degree of freedom corresponding to the valley of the constituting carriers. Strong spin-orbit interaction and the resulting ordering of the spin-split subbands in the valence and conduction bands makes the lowest-lying excitons in WX${}_2$ (X~being S or Se) spin-forbidden and optically dark. With polarization-resolved photoluminescence experiments performed on a WSe${}_2$ monolayer encapsulated in a hexagonal boron nitride, we show how the intrinsic exchange interaction in combination with the applied in-plane and/or out-of-plane magnetic fields enables one to probe and manipulate the valley degree of freedom of the dark excitons.

arXiv commentManuscript: 6 pages, 3 figures; SM: 6 pages, 5 figures

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Cited by in corpus (37)

• Measurement of the Spin-Forbidden Dark Excitons in MoS2 and MoSe2 monolayers
• Exciton g-factors of van der Waals heterostructures from first principles calculations
• Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2
• Guide to optical spectroscopy of layered semiconductors
• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
• 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
• Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder
• Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe${}_2$
• Exciton valley depolarization in monolayer transition-metal dichalcogenides
• Neutral and charged dark excitons in monolayer WS${}_2$
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Ultrafast valley-selective coherent optical manipulation with excitons in WSe${}_2$ and MoS${}_2$ monolayers
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Excitation-Dependent High-Lying Excitonic Exchange via Interlayer Energy Transfer from Lower-to-Higher Bandgap 2D Material
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Edge magnetism in transition metal dichalcogenide nanoribbons: Mean field theory and determinant quantum Monte Carlo
• The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe${}_2$ monolayer
• Excitons and trions in WSSe monolayers
• Magnetically tunable exciton valley coherence in monolayer WS${}_2$ mediated by the electron-hole exchange and exciton-phonon interactions
• Semiconductor Bloch equation analysis of optical Stark and Bloch-Siegert shifts in monolayers WSe${}_2$ and MoS${}_2$
• Magnetic field mixing and splitting of bright and dark excitons in monolayer MoSe2
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Probing spin dynamics of 2D excitons with twisted light
• Photoluminescence kinetics of dark and bright excitons in atomically thin MoS${}_2$
• Engineering Purcell factor anisotropy for dark and bright excitons in two dimensional semiconductors
• Brightening odd-parity excitons in transition-metal dichalcogenides: Rashba spin-orbit interaction, skyrmions, and cavity polaritons
• Pairing of electro-magnetic bosons under spin-orbit coupling
• Multidimensional sensing of proximity magnetic fields via intrinsic activation of dark excitons in WSe${}_2$/CrCl${}_3$ heterostructure
• Valley-dependent emission patterns enabled by plasmonic nanoantennas
• Ultrafast room-temperature valley manipulation in silicon and diamond
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2