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.

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Cited by in corpus (277)

• Signatures of moiré-trapped valley excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Concepts of Ferrovalley Material and Anomalous Valley Hall Effect
• Valley-selective optical Stark effect in monolayer WS2
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field
• Generation and detection of pure valley current by electrically induced Berry curvature in bilayer graphene
• Magnetic brightening and control of dark excitons in monolayer WSe2
• Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe${}_2$/CrI${}_3$ Heterostructures
• Giant and tunable valley degeneracy splitting in MoTe2
• Valley-protected backscattering suppression in silicon photonic graphene
• Valley-contrasting orbital angular momentum in photonic valley crystals
• Topological Exciton Bands in Moiré Heterojunctions
• Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS${}_2$ and MoS${}_2$ to 65 Tesla
• Engineering symmetry breaking in two-dimensional layered materials
• Valley excitons in two-dimensional semiconductors
• Exciton band structure of monolayer MoS2
• Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
• Topological Polaritons
• Control of interlayer excitons in two-dimensional van der Waals heterostructures
• Magneto-Optics of Exciton Rydberg States in a Monolayer Semiconductor
• Giant Valley Splitting in Monolayer WS2 by Magnetic Proximity Effect
• Room temperature Tamm-Plasmon Exciton-Polaritons with a WSe2 monolayer
• Charge-tuneable biexciton complexes in monolayer WSe${}_2$
• Ultrafast Manipulation of Valley Pseudospin
• Revealing the Biexciton and Trion-exciton Complexes in BN Encapsulated WSe2
• Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields
• Anomalous light cones and valley optical selection rules of interlayer excitons in twisted heterobilayers
• Optical properties of atomically thin transition metal dichalcogenides: Observations and puzzles
• Observation of Wigner crystal of electrons in a monolayer semiconductor
• Fine Structure and Lifetime of Dark Excitons in Transition Metal Dichalcogenide Monolayers
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
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• Valley Magnetoelectricity in Single-Layer MoS2
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• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Control of Exciton Valley Coherence in Transition Metal Dichalcogenide Monolayers
• Strain-engineering of Berry curvature dipole and valley magnetization in monolayer MoS${}_2$
• Exciton and trion dynamics in atomically thin MoSe2 and WSe2: effect of localization
• Coulomb-bound four- and five-particle valleytronic states in an atomically-thin semiconductor
• Proximity exchange effects in MoSe${}_2$ and WSe${}_2$ heterostructures with CrI${}_3$: twist angle, layer, and gate dependence
• Localized inter-valley defect excitons as single-photon emitters in WSe${}_2$
• Giant Zeeman splitting inducing near-unity valley polarization in van der Waals heterostructures
• Microsecond dark-exciton valley polarization memory in 2D heterostructures
• Valley Polarization by Spin Injection in a Light-Emitting van der Waals Heterojunction
• High quality-factor mechanical resonators based on WSe2 monolayers
• Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2
• Magnetic Proximity Effects in Transition-Metal Dichalcogenides: Converting Excitons
• Exciton band structure in two-dimensional materials
• Magneto-optics in transition metal diselenide monolayers
• Spin and valley dynamics of excitons in transition metal dichalcogenides monolayers
• Entanglement of single-photons and chiral phonons in atomically thin WSe${}_2$
• Valley-Layer Coupling: A New Design Principle for Valleytronics
• Probing the spin-polarized electronic band structure in monolayer transition metal dichalcogenides by optical spectroscopy
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• Gate tunable dark trions in monolayer WSe${}_2$
• Spin-layer locking of interlayer excitons trapped in moiré potentials
• Exciton g-factors of van der Waals heterostructures from first principles calculations
• Optical investigation of monolayer and bulk tungsten diselenide (WSe${}_2$) in high magnetic fields
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• Observation of Valley Zeeman and Quantum Hall Effects at Q Valley of Few-Layer Transition Metal Disulfides
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• Ambipolar Landau levels and strong band-selective carrier interactions in monolayer WSe${}_2$
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• Guide to optical spectroscopy of layered semiconductors
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• Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
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• Manipulating Spin-polarized Photocurrent in 2D Transition Metal Dichalcogenides
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• The valley Zeeman effect in inter- and intra-valley trions in monolayer WSe${}_2$
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• Magneto-excitons in large area CVD grown monolayer MoS${}_2$ and MoSe${}_2$ on sapphire
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• Observation of intervalley biexcitonic optical Stark effect in monolayer WS2
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• Opto-valleytronic imaging of atomically thin semiconductors
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• Defect healing and charge transfer mediated valley polarization in MoS${}_2$/MoSe${}_2$/MoS${}_2$ trilayer van der Waals heterostructures
• Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
• Local Spectroscopic Characterization of Spin and Layer Polarization in WSe${}_2$
• Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides
• On-Demand Spin-Orbit Interaction from Which-Layer Tunability in Bilayer Graphene
• Cavity nonlinear optics with layered materials
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• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• Twisting Dirac fermions: Circular dichroism in bilayer graphene
• Dipolar and magnetic properties of strongly absorbing hybrid interlayer excitons in pristine bilayer MoS${}_2$
• Optical control of a single spin-valley in charged WSe${}_2$ quantum dots
• Valley Zeeman effect and Landau levels in Two-Dimensional Transition Metal Dichalcogenides
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• Excitons, trions, and biexcitons in transition metal dichalcogenides: magnetic field dependence
• Strongly interaction-enhanced valley magnetic response in monolayer WSe2
• Exciton-polarons in doped semiconductors in a strong magnetic field
• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
• A Tight Binding Approach to Strain and Curvature in Monolayer Transition-Metal Dichalcogenides
• Spatial coherence of room-temperature monolayer WSe${}_2$ exciton-polaritons in a trap
• Gate-Defined One-Dimensional Channel and Broken Symmetry States in MoS${}_2$ van der Waals Heterostructures
• 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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• Nonlinear Valley Hall Effect
• Field induced topological phase transition from a three-dimensional Weyl semimetal to a two-dimensional massive Dirac metal in ZrTe5
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• Optically Probing Tunable Band Topology in Atomic Monolayers
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• Phonon-Driven Selective Modulation of Exciton Oscillator Strengths in Anatase TiO2 Nanoparticles
• Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe${}_2$, MoSe${}_2$ and MoTe${}_2$
• Atomically thin semiconductors as nonlinear mirrors
• Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides
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• Strong manipulation of the valley splitting upon twisting and gating in MoSe${}_2$/CrI${}_3$ and WSe${}_2$/CrI${}_3$ van der Waals heterostructures
• Electrically switchable valley polarization, spin/valley filter, and valve effects in transition-metal dichalcogenide monolayers interfaced with two-dimensional ferromagnetic semiconductors
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• Stability of trions in coupled quantum wells modelled by two-dimensional bilayers
• Valley polarization of singlet and triplet trions in WS${}_2$ monolayer in magnetic fields
• Valley polarized magnetic state in hole-doped mono layers of transition metal dichalcogenides
• Control of Giant Topological Magnetic Moment and Valley Splitting in Trilayer Graphene
• Electric Dipole Spin Resonance of 2D Semiconductor Spin Qubits
• 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
• Optical spin pumping induced pseudo-magnetic field in two dimensional heterostructures
• Polaritonic Chern insulators in monolayer semiconductors
• Magneto-optical chirality in a coherently coupled exciton-plasmon system
• Excitonic complexes in anisotropic atomically thin two-dimensional materials: black phosphorus and TiS${}_3$
• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
• Monolayer transition metal dichalcogenides in strong magnetic fields: Validating the Wannier model using a microscopic calculation
• Layer and orbital interference effects in photoemission from transition metal dichalcogenides
• Controlling valley splitting and Polarization of dark- and bi-excitons in monolayer WS${}_2$ by a tilted magnetic field
• Possible Realization and Protection of Valley-Polarized Quantum Hall Effect in Mn/WS2
• 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
• Spectrum of exciton states in monolayer transition metal dichalcogenides: angular momentum and Landau levels
• Confined Trions and Mott-Wigner States in a Purely Electrostatic Moiré Potential
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Probing valley filtering effect by Andreev reflection in zigzag graphene nanoribbon
• Valley-selective exciton bistability in a suspended monolayer semiconductor
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Computing Optical Properties of Ultra-thin Crystals
• Effects of parallel electric and magnetic fields on Rydberg excitons in buckled two-dimensional materials
• High throughput inverse design and Bayesian optimization of functionalities: spin splitting in two-dimensional compounds
• Revealing the nature of excitons in liquid exfoliated monolayer WS2
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• Magnon-exciton proximity coupling at a van der Waals heterointerface
• Valley Coherent Hot Carriers and Thermal Relaxation in Monolayer Transition Metal Dichalcogenides
• Optical signatures of periodic magnetization: the moiré Zeeman effect
• Magneto photoluminescence measurements of tungsten disulphide monolayers
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• Spin Hall and inverse spin galvanic effects in graphene with strong interfacial spin-orbit coupling: a quasi-classical Green's function approach
• Magneto-optical properties of bilayer transition metal dichalcogenides
• Orbital-dependent quasiparticle scattering interference in 3R-NbS2
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• Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors
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