Spatially resolved study of backscattering in the quantum spin Hall state
arXiv:1211.3917 · doi:10.1103/PhysRevX.3.021003
Abstract
The discovery of the Quantum Spin Hall state, and topological insulators in general, has sparked strong experimental efforts. Transport studies of the Quantum Spin Hall state confirmed the presence of edge states, showed ballistic edge transport in micron-sized samples and demonstrated the spin polarization of the helical edge states. While these experiments have confirmed the broad theoretical model, the properties of the QSH edge states have not yet been investigated on a local scale. Using Scanning Gate Microscopy to perturb the QSH edge states on a sub-micron scale, we identify well-localized scattering sites which likely limit the expected non-dissipative transport in the helical edge channels. In the micron-sized regions between the scattering sites, the edge states appear to propagate unperturbed as expected for an ideal QSH system and are found to be robust against weak induced potential fluctuations.
12 pages, including Supplemental Material
References in corpus (32)
- Quantum Spin Hall Effect in Graphene
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Quantum Spin Hall Effect
- Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
- Nonlocal edge state transport in the quantum spin Hall state
- The Quantum Spin Hall Effect: Theory and Experiment
- The Helical Liquid and the Edge of Quantum Spin Hall Systems
- Scanned Probe Microscopy of Electronic Transport in Carbon Nanotubes
- Stability of the quantum spin Hall effect: effects of interactions, disorder, and Z_2 topology
- Oscillatory crossover from two dimensional to three dimensional topological insulators
- Finite size effects of helical edge states in HgTe/CdTe quantum wells
- Coherent Branched Flow in a Two-Dimensional Electron Gas
- Well-localized edge states in two-dimensional topological insulators: ultrathin Bi films
- Spin polarization of the quantum spin Hall edge states
- Kondo effect in the helical edge liquid of the quantum spin Hall state
- Inelastic electron backscattering in a generic helical edge channel
- Edge Dynamics in a Quantum Spin Hall State: Effects from Rashba Spin-Orbit Interaction
- Corner Junction as a Probe of Helical Edge States
- Phonon induced backscattering in helical edge states
- Unexpected features of branched flow through high-mobility two-dimensional electron gases
- Spatially resolved manipulation of single electrons in quantum dots using a scanned probe
- Tunneling between edge states in a quantum spin Hall system
- Imaging Localized States in Graphene Nanostructures
- Electron interferometer formed with a scanning probe tip and quantum point contact
- Current Correlations in Quantum Spin Hall Insulators
- Imaging a 1-electron InAs quantum dot in an InAs/InP nanowire
- Electrical manipulation and measurement of spin properties of quantum spin Hall edge states
- Spatially probed electron-electron scattering in a two-dimensional electron gas
- Non-Equilibrium Transport Through a Gate-Controlled Barrier on the Quantum Spin Hall Edge
- Imaging the lateral shift of a quantum-point contact using scanning-gate microscopy
- Spatial mapping and manipulation of two tunnel-coupled quantum dots
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- Colloquium: Topological Band Theory
- Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
- Edge conduction in monolayer WTe2
- Imaging currents in HgTe quantum wells in the quantum spin Hall regime
- Coulomb drag
- Helical edge resistance introduced by charge puddles
- Quantum Spin Hall Effect in Two-dimensional Crystals of Transition Metal Dichalcogenides
- Unexpected edge conduction in HgTe quantum wells under broken time reversal symmetry
- Resistance of helical edges formed in a semiconductor heterostructure
- Interplay of exciton condensation and quantum spin Hall effect in InAs/GaSb bilayers
- Magnetically Defined Qubits on 3D Topological Insulators
- Proposal for the detection and braiding of Majorana fermions in a quantum spin Hall insulator
- Photogalvanic probing of helical edge channels in 2D HgTe topological insulators
- A new paradigm for the quantum spin Hall effect at high temperatures
- Failure of conductance quantization in two-dimensional topological insulators due to non-magnetic impurities
- Nonlocal resistance and its fluctuations in microstructures of band-inverted HgTe/(Hg,Cd)Te quantum wells
- Gate-controlled semimetal-topological insulator transition in an InAs/GaSb heterostructure
- Proposal for an on-demand source of polarized electrons into the edges of a topological insulator
- Epitaxial Growth of Ultraflat Bismuthene with Large Topological Band Inversion Enabled by Substrate-Orbital-Filtering Effect
- Backscattering in helical edge states from a magnetic impurity and Rashba disorder
- Hyperfine interactions in two-dimensional HgTe topological insulators
- Single-edge transport in an InAs/GaSb quantum spin Hall insulator
- Creating topological interfaces and detecting chiral edge modes in a 2D optical lattice
- Nonlinear spin-thermoelectric transport in two-dimensional topological insulators
- Spin current pumping in helical Luttinger liquids
- Topological protection brought to light by the time-reversal symmetry breaking
- Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices
- Generic helical edge states due to Rashba spin-orbit coupling in a topological insulator
- Shot noise in the edge states of 2D topological insulators
- High-temperature quantum Hall effect in finite gapped HgTe quantum wells
- Z2 peak of noise correlations in a quantum spin Hall insulator
- Current noise from a magnetic moment in a helical edge
- Pure spin current devices based on ferromagnetic topological insulators
- Effects of charge dopants in quantum spin Hall materials
- Tunneling magnetoresistance devices based on topological insulators: Ferromagnet/insulator/topological-insulator junctions employing BiSe
- Magnetotransport in disordered two-dimensional topological insulators: signatures of charge puddles
- A Topological SQUIPT based on helical edge states in proximity to superconductors
- Electronic states induced by nonmagnetic defects in two-dimensional topological insulators
- Point contacts and localization in generic helical liquids
- Two-dimensional topological insulator edge state backscattering by dephasing
- An all electron topological insulator in InAs double wells
- Analytical study of the edge states in the bosonic Haldane model
- Living on the edge: Topology, electrostatics and disorder
- Topological insulator ring with magnetic impurities
- Protection of Edge transport in Quantum Spin Hall samples: Spin-Symmetry Based General Approach and Examples
- Edge States in Lateral p-n Junctions in Inverted Band HgTe Quantum Wells
- Elastic backscattering of quantum spin Hall edge modes from Coulomb interactions with non-magnetic impurities
- Experimental observation of edge-dependent quantum pseudospin Hall effect
- Multi-frequency Shubnikov-de Haas oscillations in topological semimetal PtHgSe
- Real-space effects of a quench in the Su-Schrieffer-Heeger model and elusive dynamical appearance of the topological edge states
- Suppression of ballistic helical transport by isotropic dynamical magnetic impurities
- Probing breakdown of topological protection: Filling-factor-dependent evolution of robust quantum Hall incompressible phases
- Edge State Wave Functions from Momentum-Conserving Tunneling Spectroscopy
- Gate-tunable imbalanced Kane-Mele model in encapsulated bilayer jacutingaite
- Mode specific backscattering in a quantum point contact
- Conductance suppression by nonmagnetic point defects in helical edge channels of two-dimensional topological insulators
- Nonequilibrium transport of helical Luttinger liquids through a quantum dot
- Nonlinear planar magnetotransport due to tilted Dirac cones in topological materials
- Flux sensitivity of quantum spin Hall rings
- Electron backscattering in a cavity: ballistic and coherent effects
- RKKY to Kondo crossover in Helical Edge of a Topological Insulator
- Correlation and current anomalies in helical quantum dots
- Long-range perturbation of helical edge states by nonmagnetic defects in two-dimensional topological insulators
- Scattering anisotropy in HgTe (013) quantum well
- Exploring Topological Transport in PtHgSe Nanoribbons: Insights for Spintronic Device Integration
- Observation of the surface hybridization gap in the electrical transport properties of the ultrathin topological insulator (BiSb)Te
- Nonequilibrium Spectroscopy of Topological Edge Liquids
- Variational wavefunctions for fractional topological insulators
- A non-magnetic mechanism of backscattering in helical edge states
- Counterpropagating topological and quantum Hall edge channels
- Imaging disorder-induced scattering centers in quantum Hall incompressible strip
- Edge Reconstruction in a Quantum Spin Hall Insulator
- Markov Inequality as a Tool for Linear-Scaling Estimation of Local Observables