Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer

Abstract

The electron valley and spin degree of freedom in monolayer transition-metal dichalcogenides can be manipulated in optical and transport measurements performed in magnetic fields. The key parameter for determining the Zeeman splitting, namely the separate contribution of the electron and hole g-factor, is inaccessible in most measurements. Here we present an original method that gives access to the respective contribution of the conduction and valence band to the measured Zeeman splitting. It exploits the optical selection rules of exciton complexes, in particular the ones involving inter-valley phonons, avoiding strong renormalization effects that compromise single particle g-factor determination in transport experiments. These studies yield a direct determination of single band g factors. We measure gc1= 0.86, gc2=3.84 for the bottom (top) conduction bands and gv=6.1 for the valence band of monolayer WSe2. These measurements are helpful for quantitative interpretation of optical and transport measurements performed in magnetic fields. In addition the measured g-factors are valuable input parameters for optimizing band structure calculations of these 2D materials.

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Cited by in corpus (31)

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• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Relaxation and darkening of excitonic complexes in electrostatically-doped monolayer semiconductors: Roles of exciton-electron and trion-electron interactions
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ 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
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Optical detection of long electron spin transport lengths in a monolayer semiconductor
• Excitons and trions in monolayer semiconductors with correlated electrons
• Intervalley electron-hole exchange interaction and impurity-assisted recombination of indirect excitons in WS${}_2$ and WSe${}_2$ monolayers
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• Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
• Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors
• Magnetically tunable exciton valley coherence in monolayer WS${}_2$ mediated by the electron-hole exchange and exciton-phonon interactions
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Two dimensional semiconductors: optical and electronic properties
• Ten-valley excitonic complexes in charge-tunable monolayer WSe${}_2$
• 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
• Landau-level composition of bound exciton states in magnetic field
• Exchange-enhanced spin-orbit splitting and its density dependence for electrons in monolayer transition metal dichalcogenides
• Spin-deformation coupling in two-dimensional polar materials
• Spin/Valley pumping of resident electrons in WSe2 and WS2 monolayers
• Orbital Magnetization of Correlated States in Twisted Bilayer Transition Metal Dichalcogenides
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Rydberg series of intralayer K-excitons in WSe${}_2$ multilayers
• Efficient valley polarization of charged excitons and resident carriers in MoS2 monolayers by optical pumping
• Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2