Magnetic Control of Valley Pseudospin in Monolayer WSe2

Abstract

Local energy extrema of the bands in momentum space, or valleys, can endow electrons in solids with pseudo-spin in addition to real spin. In transition metal dichalcogenides this valley pseudo-spin, like real spin, is associated with a magnetic moment which underlies the valley-dependent circular dichroism that allows optical generation of valley polarization, intervalley quantum coherence, and the valley Hall effect. However, magnetic manipulation of valley pseudospin via this magnetic moment, analogous to what is possible with real spin, has not been shown before. Here we report observation of the valley Zeeman splitting and magnetic tuning of polarization and coherence of the excitonic valley pseudospin, by performing polarization-resolved magneto-photoluminescence on monolayer WSe2. Our measurements reveal both the atomic orbital and lattice contributions to the valley orbital magnetic moment; demonstrate the deviation of the band edges in the valleys from an exact massive Dirac fermion model; and reveal a striking difference between the magnetic responses of neutral and charged valley excitons which is explained by renormalization of the excitonic spectrum due to strong exchange interactions.

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Cited by in corpus (159)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• 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
• Observation of Wigner crystal of electrons in a monolayer semiconductor
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Valley-dependent properties of monolayer MoSi${}_2$N${}_4$, WSi${}_2$N${}_4$ and MoSi${}_2$As${}_4$
• 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
• Large valley splitting in monolayer WS${}_2$ by proximity coupling to an insulating antiferromagnetic substrate
• 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
• Valley-related multiple Hall effect in single-layer VSi2P4
• Excitonic valley effects in monolayer WS${}_2$ under high magnetic fields
• Directional Interlayer Spin-Valley Transfer in Two-Dimensional Heterostructures
• Valley pseudospin in monolayer MoSi2N4 and MoSi2As4
• 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
• Spin-Valley Locking Effect in Defect States of Monolayer MoS${}_2$
• Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
• 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${}_2$
• Dark excitons and the elusive valley polarization in transition metal dichalcogenides
• Electron-exciton interactions in the exciton-polaron problem
• Identifying defect-related quantum emitters in monolayer WSe${}_2$
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• Observation of intervalley biexcitonic optical Stark effect in monolayer WS2
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• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
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• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
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• Spatial coherence of room-temperature monolayer WSe${}_2$ exciton-polaritons in a trap
• 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
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
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• 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
• Tunable spin and valley excitations of correlated insulators in $\Gamma$-valley moiré bands
• 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
• 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
• Intrinsic p-type W-based transition metal dichalcogenide by substitutional Ta-doping
• Stacking-dependent exciton multiplicity in WSe${}_2$ bilayers
• Floquet Valley-Polarized Quantum Anomalous Hall State in Nonmagnetic Heterobilayers
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• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Highly Tunable Ground and Excited State Excitonic Dipoles in Multilayer 2H-MoSe${}_2$
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• Spontaneous valley polarization in 2D organometallic lattice
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• Vibrational dichroism of chiral valley phonons
• Effects of substrate-surface reconstruction and orientation on spin-valley polarization in MoTe${}_2$/EuO
• Excitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4
• Layer pseudospin dynamics and genuine non-Abelian Berry phase in inhomogeneously strained moiré pattern
• Control of Giant Topological Magnetic Moment and Valley Splitting in Trilayer Graphene
• Spontaneous spin-valley polarization in NbSe2 at a van der Waals interface
• Observation of Ultralong Valley Lifetime in WSe2/MoS2 Heterostructures
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Magneto-optical chirality in a coherently coupled exciton-plasmon system
• Polaritonic Chern insulators in monolayer semiconductors
• 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
• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
• The strong modulation limit of excitons and trions in moiré materials
• Effect of fermion indistinguishability on optical absorption of doped two-dimensional semiconductors
• Chiral topological excitons in the monolayer transition metal dichalcogenides
• Spectrum of exciton states in monolayer transition metal dichalcogenides: angular momentum and Landau levels
• Controlled Curie temperature, magnetocrystalline anisotropy, and valley polarization in 2D ferromagnetic Janus 2H-VSeS monolayer
• High-temperature Majorana corner modes in a $d+i{d}^{\prime }$ superconductor heterostructure: Application to twisted bilayer cuprate superconductors
• Probing valley filtering effect by Andreev reflection in zigzag graphene nanoribbon
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Revealing the nature of excitons in liquid exfoliated monolayer WS2
• Effects of parallel electric and magnetic fields on Rydberg excitons in buckled two-dimensional materials
• 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
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• Optically controlled single-valley exciton doublet states with tunable internal spin structures and spin magnetization generation
• Nonlinear exciton drift in piezoelectric two-dimensional materials
• Magneto photoluminescence measurements of tungsten disulphide monolayers
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• Orbital-dependent quasiparticle scattering interference in 3R-NbS2
• Magnetically tunable exciton valley coherence in monolayer WS${}_2$ mediated by the electron-hole exchange and exciton-phonon interactions
• Spin valve effect in two-dimensional VSe${}_2$ system
• Semiconductor Bloch equation analysis of optical Stark and Bloch-Siegert shifts in monolayers WSe${}_2$ and MoS${}_2$
• Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors
• Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model
• Proximity-induced spin-polarized magnetocaloric effect in transition metal dichalcogenides
• Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe${}_2$
• Inheritance of the exciton geometric structure from Bloch electrons in two-dimensional layered semiconductors
• Effective low energy Hamiltonians and unconventional Landau level spectrum of monolayer C${}_3$N
• Anomalous magneto-optical response and chiral interface of dipolar excitons at twisted valleys
• Magnetic field control of light-induced spin accumulation in monolayer MoSe${}_2$
• Supersymmetry dictated topology in periodic gauge fields and realization in strained and twisted 2D materials
• Magnetoexcitons in phosphorene monolayers, bilayers, and van der Waals heterostructures
• Coupled exciton internal and center-of-mass motions in two-dimensional semiconductors by a periodic electrostatic potential
• Searching for Unconventional Superfluid in Excitons of Monolayer Semiconductors
• Single photon emitters with polarization and orbital angular momentum locking in monolayer semiconductors
• Valley-polarization and stable triplet exciton formation in 2D lateral heterostrcuture of hBN-kagome and graphene
• Valley-dependent electronic properties in two-dimensional altermagnetic iron-based transition metal chalcogenides
• Laser-field detuning assisted optimization of exciton valley dynamics in monolayer WSe${}_2$: Geometric quantum speed limit
• Engineering chiral topological superconductivity in twisted Ising superconductors
• Valley transport driven by dynamic lattice distortion
• Electric-field-tunable intervalley excitons and phonon replicas in bilayer WSe${}_2$
• Landau-level composition of bound exciton states in magnetic field
• Laser-patterned submicron Bi2Se3-WS2 pixels with tunable circular polarization at room temperature
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• Light-controlled room temperature ferromagnetism in vanadium-doped tungsten diselenide semiconducting monolayers
• Single Quantum Emitters in Monolayer Semiconductors
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• Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2
• Intrinsic Valley-Related Multiple Hall Effect in 2D Organometallic Lattice
• Spin-orbit-driven quarter semimetals in rhombohedral graphene
• Giant-exchange-driven Vectorial Control of a Minimal Topological Magnet in Eu3In2As4
• Spin and valley filter based on two-dimensional WSe${}_2$ heterostructures
• Magnetic control of Goos-Hänchen shifts and group delay time in monolayer WSe${}_2$
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