The valley Zeeman effect in inter- and intra-valley trions in monolayer WSe${}_2$

Abstract

Monolayer transition metal dichalcogenides (TMDs) hold great promise for future information processing applications utilizing a combination of electron spin and valley pseudospin. This unique spin system has led to observation of the valley Zeeman effect in neutral and charged excitonic resonances under applied magnetic fields. However, reported values of the trion valley Zeeman splitting remain highly inconsistent across studies. Here, we utilize high quality hBN encapsulated monolayer WSe${}_2$ to enable simultaneous measurement of both intervalley and intravalley trion photoluminescence. We find the valley Zeeman splitting of each trion state to be describable only by a combination of three distinct g-factors, one arising from the exciton-like valley Zeeman effect, the other two, trion specific, g-factors associated with recoil of the excess electron. This complex picture goes significantly beyond the valley Zeeman effect reported for neutral excitons, and eliminates the ambiguity surrounding the magneto-optical response of trions in tungsten based TMD monolayers.

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Cited by in corpus (23)

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• Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe${}_2$ / CrBr${}_3$ van der Waals heterostructures
• Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
• Moiré-trapped interlayer trions in a charge-tunable WSe${}_2$/MoSe${}_2$ heterobilayer
• Optical control of valley Zeeman effect through many-exciton interactions
• Magneto-optics of a Weyl semimetal beyond the conical band approximation: the case study of TaP
• Electron recoil effect in electrically tunable MoSe2 monolayers
• Exposing the trion's fine structure by controlling the carrier concentration in hBN-encapsulated MoS${}_2$
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Spin Manipulation by Giant Valley-Zeeman Spin-Orbit Field in Atom-Thick WSe2
• Three-particle states and brightening of intervalley excitons in a doped MoS${}_2$ monolayer
• Electric Dipole Spin Resonance of 2D Semiconductor Spin Qubits
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Nonlocal Exciton-Photon Interactions in Hybrid High-Q Beam Nanocavities with Encapsulated MoS${}_2$ Monolayers
• Excited-State Trions in Two Dimensional Materials
• Interlayer excitonic spectra of vertically stacked MoSe${}_2$/WSe${}_2$ heterobilayers
• Adsorption and dissociation of diatomic molecules in monolayer $1H$-MoSe${}_2$
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Large photoluminescence enhancement by an out-of-plane magnetic field in exfoliated WS${}_2$ flakes
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Valley Emission and Upconversion in Isotopically Engineered Monolayer WS${}_2$ under Resonant Excitation
• Trion transfer in mixed-dimensional heterostructures
• Magnetoexcitons and Massive Dirac Fermions in Monolayers of Transition Metal Dichalcogenides in a High Magnetic Field