Thermal bottleneck in a freely suspended superconducting island on InAs nanowire
E.V. Shpagina, E.S. Tikhonov, D. Ruhstorfer, G. Koblmueller, and V.S. Khrapai
TL;DR
This study reveals a thermal relaxation bottleneck in superconducting islands on InAs nanowires caused by environmental cooling limitations, affecting heat balance and phonon heating.
Contribution
It demonstrates the impact of environmental cooling on non-equilibrium behavior in superconducting nanowire islands, highlighting a thermal bottleneck.
Findings
Thermal relaxation bottleneck identified in superconducting islands.
Cooling via surrounding 3He is the dominant thermal pathway.
Phonon heating occurs due to environmental cooling limitations.
Abstract
We investigate the heat balance in superconducting islands (S-islands) formed in epitaxial Al/InAs nanowires (NWs) freely suspended above the substrate. We employ a Joule spectroscopy approach, which traces the superconductor-normal transition in the S-island mediated by heating of the neighboring InAs NW segments via transport current. The temperature of the surrounding 3He bath is varied with nearby mesoscopic heaters and controlled with the NW Johnson noise thermometry. The experiment reveals a substantial thermal relaxation bottleneck associated with the cooling via surrounding 3He, which gives rise to phonon heating in the S-island. Our results uncover the role of environmental cooling in non-equilibrium experiments in S-islands in NW devices.
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