Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2

Abstract

A monolayer of a transition metal dichalcogenide (TMD) such as WSe${}_2$ is a two-dimensional (2D) direct band-gap valley-semiconductor having an effective Honeycomb lattice structure with broken inversion symmetry. The inequivalent valleys in the Brillouin zone could be selectively addressed using circularly-polarized light fields, suggesting the possibility for magneto-optical measurement and manipulation of the valley pseudospin degree of freedom. Here we report such experiments that demonstrate the valley Zeeman effect -- strongly anisotropic lifting of the degeneracy of the valley pseudospin degree of freedom using an external magnetic field. While the valley-splitting measured using the exciton transition is consistent with the difference of the conduction and valence band orbital magnetic moments, the trion transition exhibits an unexpectedly large valley Zeeman effect which cannot be understood using an independent electron-hole picture. Instead, we find an explanation using the recently predicted large Berry curvature and the associated magnetic moment for the electron-hole exchange interaction modified trion dispersion. Our results raise the possibility of observing optical excitation induced valley Hall effect in monolayer TMDs or topological states of photons strongly coupled to trion excitations in a microcavity.

References in corpus (11)

• Two Dimensional Atomic Crystals
• Valley polarization in MoS2 monolayers by optical pumping
• The Valley Hall Effect in MoS2 Transistors
• Tightly bound excitons in monolayer WSe2
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Non-linear Optical Spectroscopy of Excited Exciton States for Efficient Valley Coherence Generation in WSe2 Monolayers
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Orbital magnetization in periodic insulators
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation

Cited by in corpus (122)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Engineering symmetry breaking in two-dimensional layered materials
• Exciton band structure of monolayer MoS2
• Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
• Topological Polaritons
• Ultrafast Manipulation of Valley Pseudospin
• Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields
• Thickness dependence of work function, ionization energy, and electron affinity of Mo and W dichalcogenides from DFT and GW calculations
• Valley-spin polarized Landau levels in a monolayer semiconductor
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Exciton and trion dynamics in atomically thin MoSe2 and WSe2: effect of localization
• Valley Polarization by Spin Injection in a Light-Emitting van der Waals Heterojunction
• Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2
• High quality-factor mechanical resonators based on WSe2 monolayers
• Magneto-optics in transition metal diselenide monolayers
• Probing the spin-polarized electronic band structure in monolayer transition metal dichalcogenides by optical spectroscopy
• Gate tunable dark trions in monolayer WSe${}_2$
• Optical investigation of monolayer and bulk tungsten diselenide (WSe${}_2$) in high magnetic fields
• Excitonic valley effects in monolayer WS${}_2$ under high magnetic fields
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
• Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides
• Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
• Optospintronics in graphene via proximity coupling
• Valley Zeeman effect and spin-valley polarized conductance in monolayer MoS${}_2$ in a perpendicular magnetic field
• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Electron-exciton interactions in the exciton-polaron problem
• Identifying defect-related quantum emitters in monolayer WSe${}_2$
• Magneto-photoluminescence of exciton Rydberg states in monolayer WSe${}_2$
• Excitons and trions in monolayer transition metal dichalcogenides: A comparative study between the multiband model and the quadratic single-band model
• Observation of intervalley biexcitonic optical Stark effect in monolayer WS2
• Luminescent emission of excited Rydberg excitons from monolayer WSe2
• Opto-valleytronic imaging of atomically thin semiconductors
• Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides
• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
• Tunable valley and spin splittings in $\mathrm{VS}{\mathrm{i}}_2{\mathrm{N}}_4$ bilayer
• Odd-integer quantum Hall states and giant spin susceptibility in p-type few-layer WSe2
• Nonlinear Valley Hall Effect
• A possible electronic state quasi-half-valley-metal in $\mathrm{VG}{\mathrm{e}}_2{\mathrm{P}}_4$ monolayer
• Strain-driven valley states and phase transitions in Janus VSiGeN4 monolayer
• Giant proximity exchange and valley splitting in transition metal dichalcogenide/$h\mathrm{BN}$/(Co, Ni) heterostructures
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Magneto-optical transport properties of monolayer WSe2
• Landau-quantized excitonic absorption and luminescence in a monolayer valley semiconductor
• Strain-induced valley polarization, topological states, and piezomagnetism in two-dimensional altermagnetic V${}_2$Te${}_2$O, V${}_2$STeO, V${}_2$SSeO, and V${}_2$S${}_2$O
• Layer degree of freedom for excitons in transition metal dichalcogenides
• Strong manipulation of the valley splitting upon twisting and gating in MoSe${}_2$/CrI${}_3$ and WSe${}_2$/CrI${}_3$ van der Waals heterostructures
• Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Electrically switchable valley polarization, spin/valley filter, and valve effects in transition-metal dichalcogenide monolayers interfaced with two-dimensional ferromagnetic semiconductors
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• A Non-Hermitian Moiré Valley Filter
• Valley Polarization-Electric Dipole Interference and Nonlinear Chiral Selection Rules in Monolayer WSe${}_2$
• Ultrafast valley-selective coherent optical manipulation with excitons in WSe${}_2$ and MoS${}_2$ monolayers
• Niobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
• Chirality of Valley Excitons in Monolayer Transition-Metal Dichalcogenides
• Brightening of a dark monolayer semiconductor via strong light-matter coupling in a cavity
• Magneto-spectroscopy of exciton Rydberg states in a CVD grown WSe2 monolayer
• Spin Manipulation by Giant Valley-Zeeman Spin-Orbit Field in Atom-Thick WSe2
• Spontaneous spin-valley polarization in NbSe2 at a van der Waals interface
• Observation of Ultralong Valley Lifetime in WSe2/MoS2 Heterostructures
• Tunable magneto-optical properties in MoS${}_2$ via defect-induced exciton transitions
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Polaritonic Chern insulators in monolayer semiconductors
• Magneto-optical chirality in a coherently coupled exciton-plasmon system
• Controlling valley splitting and Polarization of dark- and bi-excitons in monolayer WS${}_2$ by a tilted magnetic field
• Layer and orbital interference effects in photoemission from transition metal dichalcogenides
• Strain-induced activation of chiral-phonon emission in monolayer WS${}_2$
• The strong modulation limit of excitons and trions in moiré materials
• Effect of fermion indistinguishability on optical absorption of doped two-dimensional semiconductors
• Confined Trions and Mott-Wigner States in a Purely Electrostatic Moiré Potential
• Spectrum of exciton states in monolayer transition metal dichalcogenides: angular momentum and Landau levels
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Probing valley filtering effect by Andreev reflection in zigzag graphene nanoribbon
• Revealing the nature of excitons in liquid exfoliated monolayer WS2
• Excitonic magneto-optics in monolayer transition metal dichalcogenides: From nanoribbons to two-dimensional response
• High throughput inverse design and Bayesian optimization of functionalities: spin splitting in two-dimensional compounds
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Optical signatures of periodic magnetization: the moiré Zeeman effect
• Magneto photoluminescence measurements of tungsten disulphide monolayers
• Spin Hall and inverse spin galvanic effects in graphene with strong interfacial spin-orbit coupling: a quasi-classical Green's function approach
• Orbital-dependent quasiparticle scattering interference in 3R-NbS2
• Spin-valley relaxation dynamics of Landau-quantized electrons in MoSe${}_2$ monolayer
• Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors
• Effective low energy Hamiltonians and unconventional Landau level spectrum of monolayer C${}_3$N
• Inheritance of the exciton geometric structure from Bloch electrons in two-dimensional layered semiconductors
• Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model
• Robust polaritons in magnetic monolayers of CrI3
• Large photoluminescence enhancement by an out-of-plane magnetic field in exfoliated WS${}_2$ flakes
• Valley-exchange coupling probed by angle-resolved photoluminescence
• Magnetic field control of light-induced spin accumulation in monolayer MoSe${}_2$
• Anomalous magneto-optical response and chiral interface of dipolar excitons at twisted valleys
• Dark exciton energy splitting in monolayer WSe2: insights from time-dependent density-functional theory
• Coupled exciton internal and center-of-mass motions in two-dimensional semiconductors by a periodic electrostatic potential
• Magnetoexcitons in phosphorene monolayers, bilayers, and van der Waals heterostructures
• Valley-polarization and stable triplet exciton formation in 2D lateral heterostrcuture of hBN-kagome and graphene
• Pairing of electro-magnetic bosons under spin-orbit coupling
• Valley transport driven by dynamic lattice distortion
• Valley spin-acoustic resonance in MoS${}_2$ monolayers
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Valley-dependent electronic properties in two-dimensional altermagnetic iron-based transition metal chalcogenides
• Phonon Assisted Exciton Processes in Two-Dimensional Tungsten Monocarbide
• Landau-level composition of bound exciton states in magnetic field
• Non-degenerate valleys in the half-metallic ferromagnet Fe/WS${}_2$
• Nonlinear Valley and Spin Valves in Bilayer Graphene
• Controllable fusion of electromagnetic bosons in two-dimensional semiconductors
• Asymmetric Andreev resonant state with a magnetic exchange field in spin-triplet superconducting monolayer $Mo{S}_2$
• Magnetic proximity coupling to defects in a two-dimensional semiconductor
• Effects of Strain-Induced Pseudogauge Fields on Exciton Dispersion, Transport, and Interactions in Transition Metal Dichalcogenides Nanoribbons
• Engineering topological exciton structures in two-dimensional semiconductors by a periodic electrostatic potential
• Giant and Broadband Circular Dichroism from Particle-Hole Symmetry Breaking in Weyl Semimetals
• Realizing giant valley polarization effect based on monolayer altermagnets
• Single Quantum Emitters in Monolayer Semiconductors
• Magnetic control of Goos-Hänchen shifts and group delay time in monolayer WSe${}_2$
• Gate-tunable spin-valley transport via carrier velocity in monolayer WSe${}_2$
• Single photon emitters in exfoliated WSe2 structures
• Spin-orbit-driven quarter semimetals in rhombohedral graphene
• Spectral analysis of the magneto-optical response in valley polarized Pb${}_{1-x}$Sn${}_x$Se