A valley valve and electron beam splitter

Abstract

Developing alternative paradigms of electronics beyond silicon technology requires the exploration of fundamentally new physical mechanisms, such as the valley specific phenomena in hexagonal two-dimensional materials. We realize ballistic valley Hall kink states in bilayer graphene and demonstrate gate-controlled current transmission in a four-kink router device. The operations of a waveguide, a valve and a tunable electron beam splitter are demonstrated. The valley valve exploits the valley-momentum locking of the kink states and reaches an on/off ratio of 8 at zero magnetic field. A magnetic field enables a full-ranged tunable coherent beam splitter. These results pave the path to building a scalable, coherent quantum transportation network based on the kink states.

References in corpus (28)

• Boron nitride substrates for high-quality graphene electronics
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Berry Phase Effects on Electronic Properties
• Landau level degeneracy and quantum Hall effect in a graphite bilayer
• The Valley Hall Effect in MoS2 Transistors
• Valley filter and valley valve in graphene
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• The electronic properties of bilayer graphene
• Detecting Topological Currents in Graphene Superlattices
• Topological confinement in bilayer graphene
• Generation and detection of pure valley current by electrically induced Berry curvature in bilayer graphene
• Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-Reversal Symmetry
• Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
• Gate-tunable Topological Valley Transport in Bilayer Graphene
• All-electric all-semiconductor spin field effect transistors
• Gate-controlled topological conducting channels in bilayer graphene
• Electronic Highways in Bilayer Graphene
• Valley-Hall Kink and Edge States in Multilayer Graphene
• Direct measurement of discrete valley and orbital quantum numbers in a multicomponent quantum Hall system
• Anomalous sequence of quantum Hall liquids revealing tunable Lifshitz transition in bilayer graphene
• Current partition at topological zero-line intersections
• A Stable Pfaffian State in Bilayer Graphene
• Marginality of bulk-edge correspondence for single-valley Hamiltonians
• Chiral states in bilayer graphene: magnetic field dependence and gap opening
• Effective Landau Level Diagram of Bilayer Graphene
• Gate tunable current partition in graphene based topological zero lines
• Valley-kink in Bilayer Graphene at $\nu =0$: A Charge Density Signature for Quantum Hall Ferromagnetism
• Helical quantum Hall Edge modes in bilayer graphene: a realization of quantum spin-ladders

Cited by in corpus (65)

• Van der Waals heterostructures for high-performance device applications: challenges and opportunities
• Colloquium: Quantum anomalous Hall effect
• Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
• Valley-dependent properties of monolayer MoSi${}_2$N${}_4$, WSi${}_2$N${}_4$ and MoSi${}_2$As${}_4$
• Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
• Valley-Layer Coupling: A New Design Principle for Valleytronics
• Valley Polarization and Inversion in Strained Graphene via Pseudo-Landau Levels, Valley Splitting of Real Landau Levels and Confined States
• Valley kink states and topological channel intersections in substrate-integrated photonic circuitry
• Aharonov Bohm Effect in Graphene Fabry Pérot Quantum Hall Interferometers
• Gapped Topological Kink States and Topological Corner States in Graphene
• Valley Isospin Controlled Fractional Quantum Hall States in Bilayer Graphene
• Bilayer Photonic Graphene
• Quantum Spin-Valley Hall Kink States: From Concept to Materials Design
• Topological Valley Hall Edge State Lasing
• Dispersive Landau levels and valley currents in strained graphene nanoribbons
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Observation of boundary induced chiral anomaly bulk states and their transport properties
• Dissipationless Layertronics in Axion Insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Optically Probing Tunable Band Topology in Atomic Monolayers
• High-Temperature Quantum Valley Hall Effect with Quantized Resistance and a Topological Switch
• Superconducting proximity effect in a transparent van der Waals superconductor-metal junction
• Bulk valley transport and Berry curvature spreading at the edge of flat bands
• Cornertronics in Two-Dimensional Second-Order Topological Insulators
• Hofstadter butterfly and Floquet topological insulators in minimally twisted bilayer graphene
• Piezoelectricity and Topological Quantum Phase Transitions in Two-Dimensional Spin-Orbit Coupled Crystals with Time-Reversal Symmetry
• Gapless Spin Wave Transport through a Quantum Canted-Antiferromagnet
• Valley-polarization in biased bilayer graphene using circularly polarized light
• A Non-Hermitian Moiré Valley Filter
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Metallic Phase and Temperature Dependence of the $\nu =0$ Quantum Hall State in Bilayer Graphene
• Combined minivalley and layer control in twisted double bilayer graphene
• Metallic Network of Topological Domain Walls
• Emission and Coherent Control of Levitons in Graphene
• Observation of Time-Reversal Invariant Helical Edge-Modes in Bilayer Graphene/WSe${}_2$ Heterostructure
• Valley-Current Splitter in Minimally Twisted Bilayer Graphene
• Layer Zero-Line Modes in Antiferromagnetic Topological Insulators
• Reverse strain-induced snake states in graphene nanoribbons
• Aharonov-Bohm oscillations in bilayer graphene edge state Fabry-Pérot interferometers
• Interplay between topological protected valley and quantum Hall edge transport
• Transport Induced Dimer State from Topological Corner States
• Valley-selective Klein tunneling through superlattice barrier in graphene
• Specular electron focusing between gate-defined quantum point contacts in bilayer graphene
• Optical flux pump in the quantum Hall regime
• Scattering of topological kink-antikink states in bilayer graphene structures
• A ballistic electron source with magnetically-controlled valley polarization in bilayer graphene
• Localized surfaces of three dimensional topological insulators
• Majorana zero modes by engineering topological kink states in two dimensional electron gas
• Metasurface electron optics in graphene
• Valley and Valley-like Split-ring Topological Photonic Crystal
• Electrically-tunable graphene nanomechanical resonators
• Absence of edge states at armchair edges in inhomogeneously strained graphene under a pseudomagnetic field
• Switching valley filtered current directions in multi-terminal graphene systems
• Movable Dirac Points with Ferroelectrics: Kink States and Berry Curvature Dipoles
• Physical Origin of Current Partition at a Topological Trifurcation
• Nanoscale ferroelectric programming of van der Waals heterostructures
• Observation of Electronic Modes in Open Cavity Resonator
• All-electrical valley filtering in graphene systems (I): A path to integrated electro-valleytronics
• Fluxoid valve effect in full-shell nanowire Josephson junctions
• Probing valley phenomena with gate-defined valley splitters
• Sagnac Electron Interference as a Probe of Electronic Structure
• Energy symmetry and interlayer wave function ratio of tunneling electrons in partially overlapped graphene
• Persistent current and orbital magnetization along a valley-contrasting junction in bilayer graphene in a magnetic field
• Continuously Tunable Berry Phase and Valley-Polarized Energy Spectra in Bilayer Graphene Quantum Dots
• Gate-defined Kondo lattices with valley-helical quantum dot arrays
• All-electrical valley filtering in graphene systems (II): Numerical study of electron transport in valley valves