Valley Degree of Freedom in Two-Dimensional van der Waals Materials
arXiv:2109.01074 · doi:10.1088/1361-6463/ac5bc9
Abstract
Layered materials can possess valleys that are indistinguishable from one another except for the momentum. These valleys are individually addressable in momentum space at the K and K' points in the first Brillouin zone. Such valley addressability opens up the possibility of utilizing the momentum state of quasi-particles as a completely new paradigm in quantum and classical information processing. This review focuses on the physics behind valley polarization and talks about carriers of valley degree of freedom (VDF) in layered materials. Then we provide a detailed survey of simple spectroscopic techniques commonly utilized to identify and manipulate valley polarization in van der Waals layered materials. Finally, we conclude with the recent developments towards the manipulation of VDF for device application and associated challenges.
arXiv comment61 pages, 11 figures
References in corpus (133)
- Electric Field Effect in Atomically Thin Carbon Films
- Two-Dimensional Gas of Massless Dirac Fermions in Graphene
- Atomically thin MoS2: A new direct-gap semiconductor
- Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
- Berry Phase Effects on Electronic Properties
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Control of valley polarization in monolayer MoS2 by optical helicity
- Valley polarization in MoS2 monolayers by optical pumping
- Observation of tightly bound trions in monolayer MoS2
- MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- Valley contrasting physics in graphene: magnetic moment and topological transport
- The Valley Hall Effect in MoS2 Transistors
- Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
- Valley filter and valley valve in graphene
- Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
- Optical Spectrum of MoS: Many-body Effects and Diversity of Exciton States
- Electrical Control of Two-Dimensional Neutral and Charged Excitons in a Monolayer Semiconductor
- Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
- Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- Strong interlayer coupling in van der Waals heterostructures built from single-layer chalcogenides
- k.p theory for two-dimensional transition metal dichalcogenide semiconductors
- Wave-packet dynamics in slowly perturbed crystals: Gradient corrections and Berry-phase effects
- Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
- First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
- Magnetic Control of Valley Pseudospin in Monolayer WSe2
- Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene
- Commensurate-incommensurate transition for graphene on hexagonal boron nitride
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
- Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
- Detecting Topological Currents in Graphene Superlattices
- Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
- Determination of band alignment in the single layer MoS2/WSe2 heterojunction
- Electrical Tuning of Valley Magnetic Moment via Symmetry Control
- Berry phase, hyperorbits, and the Hofstadter spectrum: semiclassical dynamics in magnetic Bloch bands
- Berry phase effect in anomalous thermoelectric transport
- Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
- Valley-selective optical Stark effect in monolayer WS2
- High-temperature superfluidity with indirect excitons in van der Waals heterostructures
- Berry Curvature, Triangle Anomalies, and the Chiral Magnetic Effect in Fermi Liquids
- Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
- Electronic properties of the MoS2-WS2 heterojunction
- Photocarrier relaxation in two-dimensional semiconductors
- Electrical control of the valley Hall effect in bilayer MoS2 transistors
- Effect of spin-orbit interaction on the excitonic effects in single-layer, double-layer, and bulk MoS2
- Generation and detection of pure valley current by electrically induced Berry curvature in bilayer graphene
- Electrical control of interlayer exciton dynamics in atomically thin heterostructures
- Magnetic brightening and control of dark excitons in monolayer WSe2
- Robust optical emission polarization in MoS2 monolayers through selective valley excitation
- Monolayer MoS2: trigonal warping, "Γ-valley", and spin-orbit coupling effects
- Valley dynamics probed through charged and neutral exciton emission in monolayer WSe2
- Long-lived direct and indirect interlayer excitons in van der Waals heterostructures
- Gate-tunable Topological Valley Transport in Bilayer Graphene
- First Long-Term Application of Squeezed States of Light in a Gravitational-Wave Observatory
- Magnetoelectric effects and valley controlled spin quantum gates in transition metal dichalcogenide bilayers
- Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons
- Bright excitons in monolayer transition metal dichalcogenides: from Dirac cones to Dirac saddle points
- Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS and MoS to 65 Tesla
- Valley susceptibility of an interacting two-dimensional electron system
- Band nesting and the optical response of two-dimensional semiconducting transition metal dichalcogenides
- Valley excitons in two-dimensional semiconductors
- Exciton band structure of monolayer MoS2
- Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS_2 and WS_2
- Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
- Strain-induced spatial and spectral isolation of quantum emitters in mono- and bi-layer WSe2
- Helicity resolved Raman scattering of MoS2, MoSe2, WS2 and WSe2 atomic layers
- Exciton Valley Dynamics probed by Kerr Rotation in WSe2 Monolayers
- Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
- Anomalously Robust Valley Polarization and Valley Coherence in Bilayer WS2
- Giant Nonlocality near the Dirac Point in Graphene
- Trion induced negative photoconductivity in monolayer MoS2
- Field-induced polarisation of Dirac valleys in bismuth
- Stimulated and spontaneous optical generation of electron spin coherence in charged GaAs quantum dots
- Ultrafast Manipulation of Valley Pseudospin
- Intrinsic spin Hall effect in monolayers of group-VI dichalcogenides: A first-principles study
- Revealing the Biexciton and Trion-exciton Complexes in BN Encapsulated WSe2
- Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
- Trion Formation Dynamics in Monolayer Transition Metal Dichalcogenides
- Spin-orbit engineering in transition metal dichalcogenide alloy monolayers
- Probing critical point energies of transition metal dichalcogenides: surprising indirect gap of single layer
- Double Indirect Interlayer Exciton in a MoSe2/WSe2 van der Waals Heterostructure
- Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure
- Control of Exciton Valley Coherence in Transition Metal Dichalcogenide Monolayers
- Valley-Hall Kink and Edge States in Multilayer Graphene
- Stacking Order dependent Electric Field tuning of the Band Gap in Graphene Multilayers
- Dirac electronic states in graphene systems: Optical spectroscopy studies
- Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field
- A valley valve and electron beam splitter
- Microsecond dark-exciton valley polarization memory in 2D heterostructures
- Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures
- Nonlocal Charge Transport Mediated by Spin Diffusion in the Spin-Hall Effect Regime
- Tunable Phases of Moiré Excitons in van der Waals Heterostructures
- Magneto-optics in transition metal diselenide monolayers
- Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
- Berry phase modification to the energy spectrum of excitons
- Excitonic valley effects in monolayer WS under high magnetic fields
- Long-Lived Valley Polarization of Intra-Valley Trions in Monolayer WSe2
- Interlayer coupling and gate-tunable excitons in transition metal dichalcogenide heterostructures
- Intrinsic valley Hall transport in atomically thin MoS2
- Giant spin-orbit splitting of point defect states in monolayer WS
- Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
- Electron spin resonance and spin-valley physics in a silicon double quantum dot
- Spatially Resolving Valley Quantum Interference of a Donor in Silicon
- Dark excitons and the elusive valley polarization in transition metal dichalcogenides
- θ-Tunable Photoluminescence from Interlayer Excitons in Twisted Bilayer Graphene
- Giant magneto-drag in graphene at charge neutrality
- Interlayer excitons in transition metal dichalcogenide heterostructures
- Probing and manipulating valley coherence of dark excitons in monolayer WSe
- Interlayer excitons in van der Waals heterostructures: Binding energy, Stark shift, and field-induced dissociation
- Double resonant Raman scattering and valley coherence generation in monolayer WSe2
- Observation of spin-valley coupling induced large spin lifetime anisotropy in bilayer graphene
- Opto-valleytronic imaging of atomically thin semiconductors
- Imaging Spin Dynamics in Monolayer WS2 by Time-Resolved Kerr Rotation Microscopy
- Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength Dependent Mapping
- Trion Valley Coherence in Monolayer Semiconductors
- Large Range Manipulation of Exciton Species in Monolayer WS2
- Origins of Nonlocality near the Dirac Point in Graphene
- Trion and Biexciton in Monolayer Transition Metal Dichalcogenides
- Resonance profiles of valley polarization in single-layer MoS and MoSe
- Unveiling valley lifetimes of free charge carriers in monolayer WSe
- Prominent room temperature valley polarization in WS2/graphene heterostructures grown by chemical vapor deposition
- Controlling exciton many-body states by the electric-field effect in monolayer MoS
- Tunable thermoelectricity in monolayers of MoS and other group-VI dichalcogenides
- Exciton-to-trion conversion as a control mechanism for valley polarization in room-temperature monolayer WS
- Enhancement of Exciton Valley Polarization in Monolayer MoS2 Induced by Scattering
- Valley-polarization in biased bilayer graphene using circularly polarized light
- Valley polarization of singlet and triplet trions in WS monolayer in magnetic fields
- Enhanced spin lifetimes in a two dimensional electron gas in a gate-controlled GaAs quantum well
- Identifying optical signatures of momentum-dark excitons in transition metal dichalcogenide monolayers
- Two-dimensional excitons in monolayer transition metal dichalcogenides from simple models and variational calculations
- Dirac fermions in graphene and analogues: magnetic field and topological properties
- Ultrafast valley polarization in bilayer graphene