Perfect Andreev Reflection of Helical Edge Modes in InAs/GaSb Quantum Wells
arXiv:1106.5819 · doi:10.1103/PhysRevLett.109.186603
Abstract
We present an experimental study of inverted InAs/GaSb composite quantum wells in the hybridization regime and contacted by superconducting electrodes. A front gate is used to vary the Fermi level into the mini-gap, where recent experiments indicate existence of helical edge modes [arXiv:1105.0137]. Zero bias dips in differential resistance are observed across the mini-gap, suggesting transport dominated by Andreev reflection processes. Evolution of the mini-gap differential resistance with applied bias as well as measured mini-gap excess current of 150 nA are in good agreement with the prediction of perfect Andreev reflection of the helical edge modes, which is necessitated by the absence of back-scattering channels. The perfect Andreev reflection occurs in spite of a finite barrier at the interface and shows strong sensitivity to time-reversal breaking - hallmarks of the helical nature of quantum spin Hall edges.
References in corpus (8)
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
- Nonlocal edge state transport in the quantum spin Hall state
- Quantum Spin Hall Effect in Inverted Type II Semiconductors
- Non-equilibrium Josephson effect through helical edge states
- Quantum Andreev effect in 2D HgTe/CdTe quantum well-superconductor systems
Cited by in corpus (102)
- Search for Majorana fermions in superconductors
- Topological Insulator Materials
- Topological Phases in Two-Dimensional Materials: A Brief Review
- Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-Reversal Symmetry
- Induced Superconductivity in the Quantum Spin Hall Edge
- Random-matrix theory of Majorana fermions and topological superconductors
- Edge-mode Superconductivity in a Two Dimensional Topological Insulator
- Supercurrent in the quantum Hall regime
- Fermion-parity anomaly of the critical supercurrent in the quantum spin-Hall effect
- Time-Reversal-Invariant Fractional Josephson Effect
- Low-Energy Effective Hamiltonian for Giant-Gap Quantum Spin Hall Insulators in Honeycomb X-Hydride/Halide (X=N-Bi) Monolayers
- Single fermion manipulation via superconducting phase differences in multiterminal Josephson junctions
- A road to reality with topological superconductors
- Electric and Magnetic Tuning Between the Trivial and Topological Phases in InAs/GaSb Double Quantum Wells
- Odd-frequency superconducting pairing in one-dimensional systems
- Odd-frequency superconducting pairing and subgap density of states at the edge of a two-dimensional topological insulator without magnetism
- Proposal for the detection and braiding of Majorana fermions in a quantum spin Hall insulator
- Odd-Frequency Triplet Superconductivity at the Helical Edge of a Toplogical Insulator
- Atomically Thin Quantum Spin Hall Insulators
- Majorana Fermions on Zigzag Edge of Monolayer Transition Metal Dichalcogenides
- Two dimensional topological insulators with tunable band gaps: HgTe and HgSe monolayers
- Insulating state and giant non-local response in an InAs/GaSb quantum well in the quantum Hall regime
- Revealing topological superconductivity in extended quantum spin Hall Josephson junctions
- Non-local transport via edge-states in InAs/GaSb coupled quantum wells
- Parity measurement in topological Josephson junctions
- Three-dimensional superconductors with hybrid higher order topology
- Quantum interference of edge supercurrents in a two-dimensional topological insulator
- Conductance fingerprint of Majorana fermions in the topological Kondo effect
- Conductance signatures of odd-frequency superconductivity in quantum spin Hall systems using a quantum point contact
- High efficiency thermal switch based on topological Josephson junctions
- Large gap quantum spin Hall insulator, massless Dirac fermions and bilayer graphene analogue in InAs/Ga(In)Sb heterostructures
- Detection of Majorana Kramers pairs using a quantum point contact
- Evidence for Majorana bound states in transport properties of hybrid structures based on helical liquids
- Tunable hybridization of Majorana bound states at the quantum spin Hall edge
- From an array of quantum wires to three-dimensional fractional topological insulators
- Wigner-Poisson statistics of topological transitions in a Josephson junction
- Perfect crossed Andreev reflection in Dirac hybrid junctions in the quantum Hall regime
- Imprint of topological degeneracy in quasi-one-dimensional fractional quantum Hall states
- Bethe ansatz solution of the topological Kondo model
- Single-edge transport in an InAs/GaSb quantum spin Hall insulator
- Even-odd flux quanta effect in the Fraunhofer oscillations of an edge-channel Josephson junction
- Spin-filtered and Spatially Distinguishable Crossed Andreev Reflection in a Silicene-Superconductor Junction
- Designer non-Abelian anyon platforms: from Majorana to Fibonacci
- Engineering quantum spin Hall insulators by strained-layer heterostructures
- Quantum interference in topological insulator Josephson junctions
- Proximity-induced superconductivity and Josephson critical current in quantum spin Hall systems
- Formation and detection of Majorana modes in quantum spin Hall trenches
- On-demand thermoelectric generation of equal-spin Cooper pairs
- Effects of disorder on Coulomb-assisted braiding of Majorana zero modes
- Determination of the spin orientation of helical electrons in monolayer WTe2
- Transport studies of electron-hole and spin-orbit interaction in GaSb/InAsSb core-shell nanowire quantum dots
- Magnetic order on a topological insulator surface with warping and proximity-induced superconductivity
- Chiral Majorana edge states in HgTe quantum wells
- Topological Majorana Two-Channel Kondo Effect
- The effect of in-plane magnetic field and applied strain in quantum spin Hall systems: application to InAs/GaSb quantum wells
- Quasiparticle poisoning effects on the dynamics of topological Josephson junctions
- Spin-orbit interaction in InAs/GaSb heterostructures quantified by weak antilocalization
- Phase-tunable electron transport assisted by odd-frequency Cooper pairs in topological Josephson junctions
- A Topological SQUIPT based on helical edge states in proximity to superconductors
- Proximity-induced superconductivity within the InAs/GaSb edge conducting state
- Counterflowing edge current and its equilibration in quantum Hall devices with sharp edge potential: Roles of incompressible strips and contact configuration
- Thermal signature of Majorana fermions in Josephson junction
- Universal Quantization of Magnetic Susceptibility Jump at Topological Phase Transition
- Thermal conductance as a probe of the non-local order parameter for a topological superconductor with gauge fluctuations
- Double Andreev reflections and double electron transmissions in a normal-superconductor-normal junction based on type-II Weyl semimetal
- Spin-Pairing Correlations and Spin Polarization of Majorana Bound States in Two-Dimensional Topological Insulator Systems
- Josephson junction on one edge of a two dimensional topological insulator affected by magnetic impurity
- Interacting topological mirror excitonic insulator in one dimension
- Coherent Single Spin Source based on topological insulator
- All-electric spin transistor based on a side-gate-modulated two-dimensional topological insulator
- Localized States and Quantum Spin Hall Effect in Si-Doped InAs/GaSb Quantum Wells
- Two-impurity helical Majorana problem
- A new kind of 2D topological insulators BiCN with a giant gap and its substrate effects
- Parity dependent Josephson current through a helical Luttinger liquid
- Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
- Disorder-induced subgap states and Majorana zero-energy edge modes in two-dimensional topological insulator-superconductor hybrid structures
- Low-temperature environments for quantum computation and quantum simulation
- Interaction-induced crossover between weak anti-localization and weak localization in a disordered InAs/GaSb double quantum well
- Supercurrent Reversal in Two-Dimensional Topological Insulators
- Waiting time distributions in Quantum spin hall based heterostructures
- Minimal circuit for a flux-controlled Majorana qubit in a quantum spin-Hall insulator
- Direct Visualization and Manipulation of Tunable Quantum Well State in Semiconducting Nb2SiTe4
- Nonlocal transport in a hybrid two-dimensional topological insulator
- Topological contribution to magnetism in the Kane-Mele model: An explicit wave function approach
- Nonlocality of Majorana bound states revealed by electron waiting times in a topological Andreev interferometer
- Identifying Majorana bound states at quantum spin Hall edges using a metallic probe
- Interplay of quantum spin Hall effect and spontaneous time-reversal symmetry breaking in electron-hole bilayers II: Zero-field topological superconductivity
- Quantum computing through electron propagation in the edge states of quantum spin Hall systems
- Voltage control of the quantum scattering time in InAs/GaSb/InAs trilayer quantum wells
- Superconducting quantum spin-Hall systems with giant orbital g-factors
- Nanomechanical detection of the spin Hall effect
- Electrically controlled crossover between - and -Josephson effects through topologically-confined channels in silicene
- Chiral detection of Majorana bound states at the edge of a quantum spin Hall insulator
- Interaction effects in superconductor/quantum spin Hall devices: universal transport signatures and fractional Coulomb blockade
- Quantum spin Hall insulators and quantum valley Hall insulators of BiX/SbX (X = H, F, Cl, and Br) monolayers with a record bulk band gap
- Electrical tuning of helical edge states in topological multilayers
- Magnetotransport properties of the Quantum Spin Hall and Quantum Hall states in an inverted HgTe/CdTe and InAs/GaSb quantum wells
- Landau level transitions in InAs/AlSb/GaSb quantum wells
- Nonequilibrium Spectroscopy of Topological Edge Liquids
- Bulk transport through superconducting hybrid structures in HgTe quantum wells
- Tunable effective length of fractional Josephson junctions
- Mimicing the Kane-Mele type spin orbit interaction by spin-flexual phonon coupling in graphene devices