Vortex-enabled Andreev processes in quantum Hall-superconductor hybrids

• URL: http://arxiv.org/abs/2207.10687v1
• Date: Thu, 21 Jul 2022 18:00:15 GMT
• Title: Vortex-enabled Andreev processes in quantum Hall-superconductor hybrids
• Authors: Yuchen Tang, Christina Knapp and Jason Alicea
• Abstract summary: We investigate transport through a proximitized integer quantum Hall edge. By examining the downstream conductance, we identify regimes in which sub-gap vortex levels mediate Andreev processes. 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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