Andreev reflection in the fractional quantum Hall state

Abstract

We construct high-quality graphene-based van der Waals devices with narrow superconducting niobium nitride (NbN) electrodes, in which superconductivity and robust fqH coexist. We find crossed Andreev reflection (CAR) across the superconductor separating two fqH edges. Our observed CAR probabilities in the particle-like fractional fillings are markedly higher than those in the integer and hole-conjugate fractional fillings and depend strongly on temperature and magnetic field unlike the other fillings. Further, we find a filling-independent CAR probability in integer fillings, which we attribute to spin-orbit coupling in NbN allowing for Andreev reflection between spin-polarized edges. These results provide a route to realize novel topological superconducting phases in fqH-superconductor hybrid devices based on graphene and NbN.

arXiv commentRevised text, additional main and appendix figures

References in corpus (55)

• Fault-tolerant quantum computation by anyons
• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Unpaired Majorana fermions in quantum wires
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Paired states of fermions in two dimensions with breaking of parity and time-reversal symmetries, and the fractional quantum Hall effect
• Classification of topological insulators and superconductors in three spatial dimensions
• Topological insulators and superconductors: ten-fold way and dimensional hierarchy
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Observation of the fractional ac Josephson effect: the signature of Majorana particles
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Beyond paired quantum Hall states: parafermions and incompressible states in the first excited Landau level
• Majorana Fermion Induced Resonant Andreev Reflection
• Observation of the e/3 Fractionally Charged Laughlin Quasiparticles
• Superconductor-Nanowire Devices from Tunneling to the Multichannel Regime: Zero-Bias Oscillations and Magnetoconductance Crossover
• Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device
• Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
• Cleaning Interfaces in Layered Materials Heterostructures
• Exotic non-Abelian anyons from conventional fractional quantum Hall states
• $4\pi$-periodic Josephson supercurrent in HgTe-based topological Josephson junctions
• Induced Superconductivity in the Quantum Spin Hall Edge
• Universal topological quantum computation from a superconductor/Abelian quantum Hall heterostructure
• Randomness at the Edge: Theory of Quantum Hall transport at filling $\nu =2/3$
• Topological phases with parafermions: theory and blueprints
• Robust fractional quantum Hall states and continuous quantum phase transitions in a half-filled bilayer graphene Landau level
• Fractionalizing Majorana fermions: non-abelian statistics on the edges of abelian quantum Hall states
• Supercurrent in the quantum Hall regime
• Superconducting Proximity Effect on the Edge of Fractional Topological Insulators
• Physical mechanisms for zero-bias conductance peaks in Majorana nanowires
• Inducing Superconducting Correlation in Quantum Hall Edge States
• Fractional topological superconductors with fractionalized Majorana fermions
• Even denominator fractional quantum Hall state in bilayer graphene
• Crossed Andreev reflection in a graphene bipolar transistor
• Induced superconductivity in high mobility two dimensional electron gas in GaAs heterostructures
• Quantum Hall effect in graphene with superconducting electrodes
• Andreev Reflection in Strong Magnetic Fields
• Current-phase relation of ballistic graphene Josephson junctions
• Superconducting analogue of the parafermion fractional quantum Hall states
• Imaging work and dissipation in the quantum Hall state in graphene
• Exotic circuit elements from zero-modes in hybrid superconductor/quantum Hall systems
• Charge and Spin Transport at the Quantum Hall Edge of Graphene
• Electrical generation and detection of spin waves in a quantum Hall ferromagnet
• Interference of chiral Andreev edge states
• Synthetic Topological Qubits in Conventional Bilayer Quantum Hall Systems
• Fibonacci Anyons From Abelian Bilayer Quantum Hall States
• Skyrmion solids in monolayer graphene
• Crossed Andreev effects in two-dimensional quantum Hall systems
• Mechanisms of Andreev reflection in quantum Hall graphene
• Andreev reflection of fractional quantum Hall quasiparticles
• Current correlations of Cooper-pair tunneling into a quantum Hall system
• Signatures of Topological Superconductivity and Parafermion Zero Modes in Fractional Quantum Hall Edges
• Experimental Proposal to Detect Topological Ground State Degeneracy
• Insulating regime of an underdamped current-biased Josephson junction supporting ${\mathbb{Z}}_3$ and ${\mathbb{Z}}_4$ parafermions

Cited by in corpus (42)

• Hunting for Majoranas
• Induced superconducting pairing in integer quantum Hall edge states
• Sign reversal diode effect in superconducting Dayem nanobridges
• Evidence for chiral supercurrent in quantum Hall Josephson junctions
• Mechanisms of Andreev reflection in quantum Hall graphene
• Induced superconducting correlations in the quantum anomalous Hall insulator
• Disorder in Andreev reflection of a quantum Hall edge
• Superconductivity and fermionic dissipation in quantum Hall edges
• Crossed Andreev reflection in spin-polarized chiral edge states due to the Meissner effect
• Supercurrent-enabled Andreev reflection in a chiral quantum Hall edge state
• Loss and decoherence at the quantum Hall - superconductor interface
• Vortex-enabled Andreev processes in quantum Hall-superconductor hybrids
• Geometrical effects on the downstream conductance in quantum-Hall--superconductor hybrid systems
• Perfect crossed Andreev reflection in the proximitized graphene/superconductor/proximitized graphene junctions
• Exact Dirac-Bogoliubov-de Gennes Dynamics for Inhomogeneous Quantum Liquids
• Andreev reflection of quantum Hall states through a quantum point contact
• Anomalous periodicity and parafermion hybridization in superconducting qubits
• Quantum Hall Bogoliubov Interferometer
• SU(4) Symmetry Breaking and Induced Superconductivity in Graphene Quantum Hall Edges
• Tuning the supercurrent distribution in parallel ballistic graphene Josephson junctions
• Dynamics of parafermionic states in transport measurements
• Non-local transport measurements in hybrid quantum Hall - superconducting devices
• Andreev Reflection in the Quantum Hall Regime at an Al/InAs Junction on a Cleaved Edge
• Heat-charge separation in a hybrid superconducting quantum Hall setup
• Disorder-induced topological superconductivity in a spherical quantum-Hall--superconductor hybrid
• Chirality-selective proximity effect between chiral $p$-wave superconductors and quantum Hall insulators
• Engineering superconducting contacts transparent to a bipolar graphene
• Thermal properties of the superconductor-quantum Hall interfaces
• Floquet-Nambu theory of electron quantum optics with superconductors
• On-Demand and Tunable Andreev-Conversion of Single-Electron Charge Pulses
• Quasi-${\Phi }_0$-periodic supercurrent at quantum Hall transitions
• Edge optical effect as a probe of chiral topological superconductors
• Signatures of Parafermion Zero Modes in Fractional Quantum Hall-Superconductor Heterostructures
• Quantum computation with hybrid parafermion-spin qubits
• Can Majorana zero modes in quantum Hall edges survive edge reconstruction?
• Anisotropic supercurrent suppression and revivals in a graphene-based Josephson junction under in-plane magnetic fields
• Residual quantum coherent electron transport in doped graphene leads
• Buried Dirac points in quantum spin Hall insulators: Implications for Majorana Kramers pair-based quantum computing
• Tunneling density of states in Luttinger Liquid in proximity to a superconductor: Effect of non-local interaction
• Revealing Superconducting Chiral Edge Modes via Resistance Distributions
• Edge dependence of the Josephson current in the quantum Hall regime
• Quantized Transport of $\nu =2/3$ Fractional Quantum Hall Edge with Disordered Superconducting Proximity