Detecting Topological Currents in Graphene Superlattices
arXiv:1409.0113 · doi:10.1126/science.1254966
Abstract
Topological materials may exhibit Hall-like currents flowing transversely to the applied electric field even in the absence of a magnetic field. In graphene superlattices, which have broken inversion symmetry, topological currents originating from graphene's two valleys are predicted to flow in opposite directions and combine to produce long-range charge neutral flow. We observe this effect as a nonlocal voltage at zero magnetic field in a narrow energy range near Dirac points at distances as large as several microns away from the nominal current path. Locally, topological currents are comparable in strength to the applied current, indicating large valley-Hall angles. The long-range character of topological currents and their transistor-like control by gate voltage can be exploited for information processing based on the valley degrees of freedom.
19 pgs, 9 fgs
References in corpus (12)
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- The Valley Hall Effect in MoS2 Transistors
- Valley filter and valley valve in graphene
- Micrometer-scale ballistic transport in encapsulated graphene at room temperature
- STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
- First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
- Cross-sectional imaging of individual layers and buried interfaces of graphene-based heterostructures and superlattices
- Three dimensional topological invariants for time reversal invariant Hamiltonians and the three dimensional quantum spin Hall effect
- Giant Nonlocality near the Dirac Point in Graphene
- Hierarchy of Hofstadter states and replica quantum Hall ferromagnetism in graphene superlattices
- Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures
Cited by in corpus (84)
- Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
- Observation of topological valley transport of sound in sonic crystals
- Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
- Engineering symmetry breaking in two-dimensional layered materials
- Ultrafast Manipulation of Valley Pseudospin
- Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
- Graphene Nanobubbles as Valley Filters and Beamsplitters
- High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices
- Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve and universal reversible logic gate
- Light-Induced Valleytronics in Pristine Graphene
- Tuning the pseudospin polarization of graphene by a pseudo-magnetic field
- New generation of moiré superlattices in doubly aligned hBN/graphene/hBN heterostructures
- Nanoscale Strain Engineering of Giant Pseudo-Magnetic Fields, Valley Polarization and Topological Channels in Graphene
- Electrostatically confined monolayer graphene quantum dots with orbital and valley splittings
- Edge currents shunt the insulating bulk in gapped graphene
- Gate Switchable Transport and Optical Anisotropy in 90° Twisted Bilayer Black Phosphorus
- Hydrodynamic approach to two-dimensional electron systems
- Tunable and giant valley-selective Hall effect in gapped bilayer graphene
- Magnetoresistance in two-component systems
- Improved current density and magnetisation reconstruction through vector magnetic field measurements
- Universal superlattice potential for 2D materials from twisted interface inside h-BN substrate
- Theory of plasmonic effects in nonlinear optics: the case of graphene
- Direct electronic measurement of Peltier cooling and heating in graphene
- Valley-polarized quantum anomalous Hall phases and tunable topological phase transitions in half-hydrogenated Bi honeycomb monolayers
- Graphene hot-electron light bulb: incandescence from hBN-encapsulated graphene in air
- Probing of valley polarization in graphene via optical second-harmonic generation
- Fabry-Pérot resonances in a graphene/hBN Moiré superlattice
- Mass inversion in graphene by proximity to dichalcogenide monolayer
- Multiple Quantum Phases in Graphene with Enhanced Spin-Orbit Coupling: From the Quantum Spin Hall Regime to the Spin Hall Effect and a Robust Metallic State
- The valley filter efficiency of monolayer graphene and bilayer graphene line defect model
- Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
- Floquet engineering of twisted double bilayer graphene
- Controlling Valley-Polarisation in Graphene via Tailored Light Pulses
- Topological Valley Currents in Bilayer Graphene/Hexagonal Boron Nitride Superlattices
- Nonlocal topological valley transport at large valley Hall angles
- All-Optical Ultrafast Valley Switching in Two-Dimensional Materials
- Symmetry breaking and (pseudo)spin polarization in Veselago lenses for massless Dirac fermions
- Valley Hall Effect and Nonlocal Transport in Strained Graphene
- Edge modes and non local conductance in graphene superlattices
- Interplay of Lorentz-Berry forces in position-momentum spaces for valley-dependent impurity scattering in alpha-T3 lattices
- Perfect valley filter controlled by Fermi velocity modulation in graphene
- Topological valley transport at the curved boundary of a folded bilayer graphene
- Electronic structure of transferred graphene/h-BN van der Waals heterostructures with nonzero stacking angles by nano-ARPES
- Minimal Geometry for Valley Filtering in Graphene
- Valley Order and Loop Currents in Graphene on Hexagonal Boron Nitride
- Valley current generation using biased bilayer graphene dots
- Topological valley currents via ballistic edge modes in graphene superlattices near the primary Dirac point
- Probing valley filtering effect by Andreev reflection in zigzag graphene nanoribbon
- Giant Hall photoconductivity in narrow-gapped Dirac materials
- Topological transport in Dirac electronic systems: A concise review
- High-order minibands and interband Landau level reconstruction in graphene moire superlattice
- Valley filtering by a line-defect in graphene: quantum interference and inversion of the filter effect
- Geometric phase in Stückelberg interferometry
- Tunable valley filtering in dynamically strained - lattices
- A 50/50 electronic beam splitter in graphene nanoribbons as a building block for electron optics
- Gate-tunable valley currents, non-local resistances and valley accumulation in bilayer graphene nanostructures
- Growth, charge and thermal transport of flowered graphene
- Non-adiabatic Hall effect at Berry curvature hot spot
- Thermal transport driven by charge imbalance in graphene in magnetic field, close to the charge neutrality point at low temperature: Non local resistance
- Impact of novel electron-phonon coupling mechanisms on valley physics in two-dimensional materials
- Charge-pseudospin coupled diffusion in semi-Dirac graphene: pseudospin assisted valley transport
- Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures
- Control of Spin Diffusion and Suppression of the Hanle Effect by the Coexistence of Spin and Valley Hall Effects
- Switching valley filtered current directions in multi-terminal graphene systems
- Conservation of chirality at a junction between two Weyl semimetals
- Ultra-Low Threshold Monolayer Semiconductor Nanocavity Lasers
- Rabi-Bloch Oscillations in Spatially Distributed Systems: Temporal Dynamics and Frequency Spectra
- Breakdown of local convertibility through Majorana modes in a quantum quench
- Theory of field-modulated spin-valley-orbital pseudospin physics
- Strain-Fluctuation-Induced Near-Quantization of Valley Hall Conductivity in Graphene Systems
- Spin and valley polarized one-way Klein tunneling in photonic topological insulators
- Chiral second-sound collective mode at the edge of 2D systems with nontrivial Berry curvature
- All-electrical valley filtering in graphene systems (I): A path to integrated electro-valleytronics
- A Quantized Interband Topological Index in Two-Dimensional Systems
- Zigzag edge states in graphene in the presence of in-plane electric field
- From Digital computers to quantum computers based on biological paradigms and progress in particle physics
- Quantum Parity Hall effect in ABA Graphene
- Local Optical Conductivity of Bilayer Graphene with Kink Potential
- Continuously Tunable Berry Phase and Valley-Polarized Energy Spectra in Bilayer Graphene Quantum Dots
- Controlled formation of an isolated miniband in bilayer graphene on an almost commensurate substrate
- Proximity spin-orbit coupling in graphene on alloyed transition metal dichalcogenides
- All-electrical valley filtering in graphene systems (II): Numerical study of electron transport in valley valves
- Non-Abelian Charge Transport in Three-Flavor Gauge Semimetal Model with Braiding Majoranas
- Hall diffusion anomaly and transverse Einstein relation