Vortex-enabled Andreev processes in quantum Hall-superconductor hybrids

Abstract

Quantum Hall-superconductor heterostructures provide possible platforms for intrinsically fault-tolerant quantum computing. Motivated by several recent experiments that successfully integrated these phases, we investigate transport through a proximitized integer quantum Hall edge--paying particular attention to the impact of vortices in the superconductor. By examining the downstream conductance, we identify regimes in which sub-gap vortex levels mediate Andreev processes that would otherwise be frozen out in a vortex-free setup. Moreover, we show that at finite temperature, and in the limit of a large number of vortices, the downstream conductance can average to zero, indicating that the superconductor effectively behaves like a normal contact. Our results highlight the importance of considering vortices when using transport measurements to study superconducting correlations in quantum Hall-superconductor hybrids.

16 pages, 9 figures

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Cited by in corpus (16)

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• Evidence for chiral supercurrent in quantum Hall Josephson junctions
• Induced superconducting correlations in the quantum anomalous Hall insulator
• Loss and decoherence at the quantum Hall - superconductor interface
• 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
• Anomalous $h/2e$ periodicity and Majorana zero modes in chiral Josephson junctions
• SU(4) Symmetry Breaking and Induced Superconductivity in Graphene Quantum Hall Edges
• 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
• Transparent Graphene-Superconductor Interfaces: Quantum Hall and Zero Field Regimes
• Chirality-selective proximity effect between chiral $p$-wave superconductors and quantum Hall insulators
• Revealing Superconducting Chiral Edge Modes via Resistance Distributions
• Can Majorana zero modes in quantum Hall edges survive edge reconstruction?