Electrical Tuning of Valley Magnetic Moment via Symmetry Control

Abstract

Crystal symmetry governs the nature of electronic Bloch states. For example, in the presence of time reversal symmetry, the orbital magnetic moment and Berry curvature of the Bloch states must vanish unless inversion symmetry is broken. In certain 2D electron systems such as bilayer graphene, the intrinsic inversion symmetry can be broken simply by applying a perpendicular electric field. In principle, this offers the remarkable possibility of switching on/off and continuously tuning the magnetic moment and Berry curvature near the Dirac valleys by reversible electrical control. Here we demonstrate this principle for the first time using bilayer MoS2, which has the same symmetry as bilayer graphene but has a bandgap in the visible that allows direct optical probing of these Berry-phase related properties. We show that the optical circular dichroism, which reflects the orbital magnetic moment in the valleys, can be continuously tuned from -15% to 15% as a function of gate voltage in bilayer MoS2 field-effect transistors. In contrast, the dichroism is gate-independent in monolayer MoS2, which is structurally non-centrosymmetric. Our work demonstrates the ability to continuously vary orbital magnetic moments between positive and negative values via symmetry control. This represents a new approach to manipulating Berry-phase effects for applications in quantum electronics associated with 2D electronic materials.

13 pages main text + 4 pages supplementary materials

References in corpus (8)

• Two Dimensional Atomic Crystals
• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Valley polarization in MoS2 monolayers by optical pumping
• Valley filter and valley valve in graphene
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Symmetry-dependent phonon renormalization in monolayer MoS2 transistor
• Emergence of the persistent spin helix in semiconductor quantum wells
• Dichroic f-sum rule and the orbital magnetization of crystals

Cited by in corpus (176)

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• Local strain engineering in atomically thin MoS2
• Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
• Experimental demonstration of continuous electronic structure tuning via strain in atomically thin MoS2
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Breaking of valley degeneracy by magnetic field in monolayer MoSe2
• Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
• Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides
• Determination of band alignment in the single layer MoS2/WSe2 heterojunction
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• Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
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• Strain tuning of optical emission energy and polarization in monolayer and bilayer MoS2
• Direct imaging of the band profile in single layer $Mo{S}_2$ on graphite: quasiparticle energy gap, metallic edge states and edge band bending
• Monolayer MoS2: trigonal warping, "Γ-valley", and spin-orbit coupling effects
• Valley contrasting chiral phonons in monolayer hexagonal lattices
• Tight-binding model and direct-gap/indirect-gap transition in single-layer and multi-layer MoS${}_2$
• Vapor-Solid Growth of High Optical Quality MoS2 Monolayers With Near-Unity Valley Polarization
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• Gate-tunable Topological Valley Transport in Bilayer Graphene
• Exciton-exciton annihilation in MoSe2 monolayers
• Magnetoelectric effects and valley controlled spin quantum gates in transition metal dichalcogenide bilayers
• Engineering symmetry breaking in two-dimensional layered materials
• Anomalously Robust Valley Polarization and Valley Coherence in Bilayer WS2
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• Electronic properties of single-layer and multilayer transition metal dichalcogenides $M{X}_2$ ($M=$ Mo, W and $X=$ S, Se)
• Valley Carrier Dynamics in Monolayer Molybdenum Disulphide from Helicity Resolved Ultrafast Pump-probe Spectroscopy
• Effective lattice Hamiltonian for monolayer MoS2 : Tailoring electronic structure with perpendicular electric and magnetic fields
• Analytical approach to excitonic properties of MoS2
• Perspectives for Spintronics in 2D Materials
• Probing critical point energies of transition metal dichalcogenides: surprising indirect gap of single layer $SL-WS{e}_2$
• Observation of interlayer phonon modes in van der Waals heterostructures
• Elucidating the photoresponse of ultrathin MoS2 field-effect transistors by scanning photocurrent microscopy
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Stacking domains and dislocation networks in marginally twisted bilayers of transition metal dichalcogenides
• Intervalley biexcitons and many-body effects in monolayer MoS2
• Interlayer coupling in commensurate and incommensurate bilayer structures of transition metal dichalcogenides
• Generation and evolution of spin-, valley- and layer-polarized excited carriers in inversion-symmetric WSe2
• Magnetic control of the valley degree of freedom of massive Dirac fermions with application to transition metal dichalcogenides
• High Performance Field-Effect Transistor Based on Multilayer Tungsten Disulfide
• Electric field induced strong enhancement of electroluminescence in multi-Layer MoS2
• First-principles theory of field-effect doping in transition-metal dichalcogenides: Structural properties, electronic structure, Hall coefficient, and electrical conductivity
• Electrical tuning of layer-polarized exciton gases in WSe2 bilayers
• Disentangling orbital and valley Hall effects in bilayers of transition metal dichalcogenides
• Gate-controllable magneto-optic Kerr effect in layered collinear antiferromagnets
• Electrically tunable valley dynamics in twisted WSe${}_2$/WSe${}_2$ bilayers
• Control of Two-Dimensional Excitonic Light Emission via Photonic Crystal
• Interlayer excitons in bilayer MoS2 with strong oscillator strength up to room temperature
• Large, valley-exclusive Bloch-Siegert shift in monolayer WS2
• Effect of Point Defects on the Optical and Transport Properties of MoS2 and WS2
• Giant Stark splitting of an exciton in bilayer MoS${}_2$
• Optical investigation of monolayer and bulk tungsten diselenide (WSe${}_2$) in high magnetic fields
• Enhanced Optoelectronic Response in Bilayer Lateral Heterostructures of Transition Metal Dichalcogenides
• Controlling interlayer excitons in MoS2 layers grown by chemical vapor deposition
• Dynamic Janus Metasurfaces in the Visible Spectral Region
• Transition-metal dichalcogenide bilayers: switching materials for spin- and valleytronic applications
• Uncovering edge states and electrical inhomogeneity in MoS2 field-effect transistors
• Ab initio calculations of ultra-short carrier dynamics in 2D materials: valley depolarization in single-layer WSe${}_2$
• Momentum dependence of spin-orbit interaction effects in single-layer and multi-layer transition metal dichalcogenides
• Electric-field switchable second-harmonic generation in bilayer MoS${}_2$ by inversion symmetry breaking
• Strain Tunable Berry Curvature Dipole, Orbital Magnetization and Nonlinear Hall Effect in WSe2 Monolayer
• Observation of Valley Zeeman and Quantum Hall Effects at Q Valley of Few-Layer Transition Metal Disulfides
• Tunable Berry curvature, valley and spin Hall effect in Bilayer MoS${}_2$
• Experimental observation of hidden Berry curvature in inversion-symmetric bulk 2H-WSe2
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• Line and Point Defects in MoSe2 Bilayer Studied by Scanning Tunneling Microscopy and Spectroscopy
• Folded MoS2 layers with reduced interlayer coupling
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• Magneto-excitons in large area CVD grown monolayer MoS${}_2$ and MoSe${}_2$ on sapphire
• Electronic Band Structure of Transition Metal Dichalcogenides from Ab Initio and Slater-Koster Tight-Binding Model
• Microscopic evidence for strong periodic lattice distortion in 2D charge-density wave systems
• Orbital Hall effect in bilayer transition metal dichalcogenides: From the intra-atomic approximation to the Bloch states orbital magnetic moment approach
• Spin Hall effect in spin-valley coupled monolayer transition-metal dichalcogenides
• Opto-valleytronic imaging of atomically thin semiconductors
• Photoinduced quantum spin and valley Hall effects and orbital magnetization in monolayer MoS2
• Majorana Fermions on Zigzag Edge of Monolayer Transition Metal Dichalcogenides
• Stacking-Dependent Interlayer Phonons in 3R and 2H MoS${}_2$
• Local Spectroscopic Characterization of Spin and Layer Polarization in WSe${}_2$
• Valley-dependent spin transport in monolayer transition-metal dichalcogenides
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• Intrinsic circular polarization in centrosymmetric stacks of transition-metal dichalcogenides
• Control of excitons in multi-layer van der Waals heterostructures
• Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength Dependent Mapping
• Odd-parity superconductivity in bilayer transition metal dichalcogenides
• Magnetism of Ta Dichalcogenide Monolayers Tuned by Strain and Hydrogenation
• Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems
• Multi-ultraflatbands tunability and effect of spin-orbit coupling in twisted bilayer transition metal dichalcogenides
• Chiral phonons and pseudo-angular momentum in non-symmorphic systems
• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
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• Two-Dimensional Valley Electrons and Excitons in Noncentrosymmetric 3R MoS${}_2$
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• Towards colloidal spintronics through Rashba spin-orbit interaction in lead sulphide nanosheets
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• Coupling ferroelectricity with spin-valley physics in oxide-based heterostructure
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• Absence of inter-layer tunnel coupling of $K$-valley electrons in bilayer MoS${}_2$
• Berry Curvature Engineering by Gating Two-Dimensional Antiferromagnets
• Exciton-polaritons in transition-metal dichalcogenides and their direct excitation via energy transfer
• Chiral phonons in honeycomb sublattice of layered CoSn-like compounds
• Electrical tuning of moiré excitons in MoSe${}_2$ bilayers
• Every-other-layer Dipolar Excitons in a Spin-Valley locked Superlattice
• Robust all-electrical topological valley filtering using monolayer 2D-Xenes
• Tunable topological Nernst effect in 2D transition metal dichalcogenides
• Magnetic MoS2 Interface Monolayer on CdS Nanowire by Cation Exchange
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Chirality of Valley Excitons in Monolayer Transition-Metal Dichalcogenides
• Spin accumulation and dynamics in inversion-symmetric van der Waals crystals
• Exploring a novel class of Janus MXenes by first principles calculations: structural, electronic and magnetic properties of Sc2CXT, X=O, F, OH; T=C, S, N
• Control of Giant Topological Magnetic Moment and Valley Splitting in Trilayer Graphene
• Orbitronics in Two-dimensional Materials
• Zero point motion and direct/indirect bandgap crossover in layered transition-metal dichalcogenides
• Layer and orbital interference effects in photoemission from transition metal dichalcogenides
• Theory of superconductivity in hole-doped monolayer MoS${}_2$
• Tunable spin-valley coupling in layered polar Dirac metals
• Weak localization in boron nitride encapsulated bilayer MoS${}_2$
• Interplay of valley polarization and dynamic nuclear polarization in 2D transition metal dichalcogenides
• Interlayer Resistance of Misoriented MoS2
• Topological Ising pairing states in monolayer and trilayer TaS${}_2$
• Hole spin relaxation in bilayer WSe${}_2$
• Quantum magnetotransport in a bilayer MoS2: influence of a perpendicular electric field
• Ultrafast charge dynamics and photoluminescence in bilayer MoS2
• Valley filtering by a line-defect in graphene: quantum interference and inversion of the filter effect
• Photoinduced valley-polarized current of layered MoS2 by electric tuning
• Quantum correction to the orbital Hall effect
• Electronic transport and the related anomalous effects in silicene-like hexagonal lattice
• Magneto-optical properties of bilayer transition metal dichalcogenides
• Magnetic parity violation and parity-time-reversal-symmetric magnets
• Gate-controlled supercurrent reversal in MoS${}_2$-based Josephson junctions
• Chiral phonons entangled with multiple Hall effects and unified convention for pseudoangular momentum in 2D materials
• Adsorption and dissociation of diatomic molecules in monolayer $1H$-MoSe${}_2$
• Anisotropic superfluidity of two-dimensional excitons in a periodic potential
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• Spin diffusion in p-type bilayer WSe${}_2$
• First-principles study on the electrical resistivity in zirconium dichalcogenides with multi-valley bands: mode-resolved analysis of electron-phonon scattering
• Valley and spin splittings in a valley-layer-locked monolayer via atomic adsorption
• Theory optical excitation spectra and depolarization dynamics in bilayer WS${}_2$ from viewpoint of excimers
• High-field Studies on Layered Magnetic and Polar Dirac Metals
• Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS${}_2$
• Dynamic Bandstructure and Capacitance Effects in Scanning Tunneling Spectroscopy of Bilayer Graphene
• Two dimensional semiconductors: optical and electronic properties
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• Valley-polarization and stable triplet exciton formation in 2D lateral heterostrcuture of hBN-kagome and graphene
• Tunable charge-trap memory based on few-layer MoS2
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• Electric-field-tunable intervalley excitons and phonon replicas in bilayer WSe${}_2$
• Spin Pumping into two-dimensional systems
• Non-degenerate valleys in the half-metallic ferromagnet Fe/WS${}_2$
• Pump-driven opto-magnetic properties in semiconducting transition-metal dichalcogenides: an analytical model
• Valley Gapless Semiconductor: Models and Applications
• Photogalvanic Effect in Silicene
• Electrical Control of Excitons in Bare-MoSe2 and MoSe2/NbSe2 Heterostructure
• Characterization of WSe${}_2$ films using reflection Kikuchi diffraction in the scanning electron microscope and multivariate statistical analyses
• Spin-dependent Transport Studies of Fe/Mo${}_x$Cr${}_{1-x}$S${}_2$/Fe Magnetic Tunnel Junction
• Quantization and quantum oscillations of the sublattice charge order in Dirac insulators
• Spin polarization in Lateral two-dimensional Heterostructures
• Directly grown monolayer MoS2 on Au foils as efficient hydrogen evolution catalysts
• Etching-free transfer of wafer-scale MoS2 films
• Enhanced Emission from WSe2 Monolayers Coupled to Circular Bragg Gratings
• Topologically induced fractional Hall steps in the integer quantum Hall regime of $Mo{S}_2$
• Interlayer Coupling Effect in van der Waals Heterostructures of Transition Metal Dichalcogenides
• Evidence of Spin-Valley Coupling in Dirac Material BaMnBi2 Probed by Quantum Hall Effect and Nonlinear Hall Effect