Mechanisms of Andreev reflection in quantum Hall graphene

Abstract

We simulate a hybrid superconductor-graphene device in the quantum Hall regime to identify the origin of downstream resistance oscillations in a recent experiment [Zhao et. al. Nature Physics 16, (2020)]. In addition to the previously studied Mach-Zehnder interference between the valley-polarized edge states, we consider disorder-induced scattering, and the previously overlooked appearance of the counter-propagating states generated by the interface density mismatch. Comparing our results with the experiment, we conclude that the observed oscillations are induced by the interfacial disorder, and that lattice-matched superconductors are necessary to observe the alternative ballistic effects.

arXiv comment16 pages, 7 figures

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Cited by in corpus (25)

• Andreev reflection in the fractional quantum Hall state
• Induced superconducting pairing in integer quantum Hall edge states
• Evidence for chiral supercurrent in quantum Hall Josephson junctions
• Disorder in Andreev reflection of a quantum Hall edge
• Superconductivity and fermionic dissipation in quantum Hall edges
• 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
• Andreev reflection of quantum Hall states through a quantum point contact
• Signatures of triplet superconductivity in nu=2-chiral Andreev states
• Thermoelectric processes of quantum normal-superconductor interfaces
• SU(4) Symmetry Breaking and Induced Superconductivity in Graphene Quantum Hall Edges
• Non-local transport measurements in hybrid quantum Hall - superconducting devices
• Heat-charge separation in a hybrid superconducting quantum Hall setup
• Andreev Reflection in the Quantum Hall Regime at an Al/InAs Junction on a Cleaved Edge
• Disorder Suppression in Topological Semiconductor-Superconductor Junctions
• Probing valley phenomena with gate-defined valley splitters
• Transparent Graphene-Superconductor Interfaces: Quantum Hall and Zero Field Regimes
• Chirality-selective proximity effect between chiral $p$-wave superconductors and quantum Hall insulators
• Floquet-Nambu theory of electron quantum optics with superconductors
• On-Demand and Tunable Andreev-Conversion of Single-Electron Charge Pulses
• Wigner representation of Andreev-reflected charge pulses
• Quantized Transport of $\nu =2/3$ Fractional Quantum Hall Edge with Disordered Superconducting Proximity
• Revealing Superconducting Chiral Edge Modes via Resistance Distributions