Exciton g-factors in monolayer and bilayer WSe${}_2$ from experiment and theory

Abstract

The optical properties of monolayer and bilayer transition metal dichalcogenide semiconductors are governed by excitons in different spin and valley configurations, providing versatile aspects for van der Waals heterostructures and devices. We present experimental and theoretical studies of exciton energy splittings in external magnetic field in neutral and charged WSe${}_2$ monolayer and bilayer crystals embedded in a field effect device for active doping control. We develop theoretical methods to calculate the exciton $g$-factors from first principles and tight-binding for all possible spin-valley configurations of excitons in monolayer and bilayer WSe${}_2$ including valley-indirect exciton configurations. Our theoretical and experimental findings shed light on some of the characteristic photoluminescence peaks observed for monolayer and bilayer WSe${}_2$. In more general terms, the theoretical aspects of our work provide new guidelines for the characterization of single and few-layer transition metal dichalcogenides, as well as their heterostructures, in the presence of external magnetic fields.

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Cited by in corpus (34)

• Hartree-Fock study of the moiré Hubbard model for twisted bilayer transition metal dichalcogenides
• Optical properties of charged excitons in two-dimensional semiconductors
• Moiré excitons in MoSe${}_2$-WSe${}_2$ heterobilayers and heterotrilayers
• Moiré and beyond in transition metal dichalcogenide twisted bilayers
• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Brightening of spin- and momentum-dark excitons in transition metal dichalcogenides
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
• Chirality of Valley Excitons in Monolayer Transition-Metal Dichalcogenides
• The first- and second-order magneto-optical effects and intrinsically anomalous transport in 2D van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I)
• Tunable magneto-optical properties in MoS${}_2$ via defect-induced exciton transitions
• VASP2KP: kp models and Lande g-factors from ab initio calculations
• 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
• Magneto-optical chirality in a coherently coupled exciton-plasmon system
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Electrically tunable dipolar interactions between layer-hybridized excitons
• Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation
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• DFT2kp: effective kp models from ab-initio data
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Hybrid moiré excitons and trions in twisted MoTe${}_2$-MoSe${}_2$ heterobilayers
• Electrically tunable layer-hybridized trions in doped WSe${}_2$ bilayers
• Layer-dependent optically-induced spin polarization in InSe
• Ten-valley excitonic complexes in charge-tunable monolayer WSe${}_2$
• Laser-field detuning assisted optimization of exciton valley dynamics in monolayer WSe${}_2$: Geometric quantum speed limit
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Multidimensional sensing of proximity magnetic fields via intrinsic activation of dark excitons in WSe${}_2$/CrCl${}_3$ heterostructure
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• Magnetic field induced partially polarized chiral spin liquid in a transition metal dichalcogenide moiré system
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2
• Robust Interlayer Exciton Interplay in Twisted van der Waals Heterotrilayer on a Broadband Bragg Reflector up to Room Temperature
• Emergence of non-uniform strain induced exciton species in homo- and heterobilayer transition metal dichalcogenides