Excitonic valley effects in monolayer WS${}_2$ under high magnetic fields

Abstract

Transition-metal dichalcogenides can be easily produced as atomically thin sheets, exhibiting the possibility to optically polarize and read out the valley pseudospin of extremely stable excitonic quasiparticles present in these 2D semiconductors. Here, we investigate a monolayer of tungsten disulphide in high magnetic fields up to 30\,T via photoluminescence spectroscopy at low temperatures. The valley degeneracy is lifted for all optical features, particularly for excitons, singlet and triplet trions, for which we determine the g factor separately. While the observation of a diamagnetic shift of the exciton and trion resonances gives us insight into the real-space extension of these quasiparticles, magnetic field induced valley polarization effects shed light onto the exciton and trion dispersion relations in reciprocal space. The field dependence of the trion valley polarizations is in line with the predicted trion splitting into singlet and triplet configurations.

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• Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
• Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
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• Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
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• Spatial extent of the excited exciton states in WS${}_2$ monolayers from diamagnetic shifts
• Excitons, trions, and biexcitons in transition metal dichalcogenides: magnetic field dependence
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides
• Optically Probing Tunable Band Topology in Atomic Monolayers
• Band nesting, massive Dirac Fermions and Valley Lande and Zeeman effects in transition metal dichalcogenides: a tight-binding model
• Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe${}_2$, MoSe${}_2$ and MoTe${}_2$
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Strong Valley Zeeman Effect of Dark Excitons in Monolayer Transition Metal Dichalcogenides in a Tilted Magnetic Field
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Interlayer exciton valley polarization dynamics in large magnetic fields
• Anisotropic Optical And Vibrational Properties Of GeS
• Monolayer transition metal dichalcogenides in strong magnetic fields: Validating the Wannier model using a microscopic calculation
• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
• Spectrum of exciton states in monolayer transition metal dichalcogenides: angular momentum and Landau levels
• Light-matter coupling and non-equilibrium dynamics of exchange-split trions in monolayer WS2
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Effects of parallel electric and magnetic fields on Rydberg excitons in buckled two-dimensional materials
• Effects of dynamical dielectric screening on the excitonic spectrum of monolayer semiconductors
• Magneto photoluminescence measurements of tungsten disulphide monolayers
• Large g factor in bilayer WS${}_2$ flakes
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• High-performance broadband Faraday rotation spectroscopy of 2D materials and thin magnetic films
• Layer-dependent optically-induced spin polarization in InSe
• Retrieval of material properties of monolayer transition-metal dichalcogenides from magnetoexciton energy spectra
• Large photoluminescence enhancement by an out-of-plane magnetic field in exfoliated WS${}_2$ flakes
• Rydberg excitons and polaritons in monolayer transition metal dichalcogenides in a magnetic field
• Magnetoexcitons in phosphorene monolayers, bilayers, and van der Waals heterostructures
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Electrostatic control of the trion fine structure in transition metal dichalcogenide monolayers
• Analytical exciton energies in monolayer transition-metal dichalcogenides
• Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
• Valley Emission and Upconversion in Isotopically Engineered Monolayer WS${}_2$ under Resonant Excitation