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arXiv · 1006.0420

Single Phase Slip Limited Switching Current in 1-Dimensional Superconducting Al Nanowires

Peng Li·Phillip M. Wu·Yuriy Bomze·Ivan V. Borzenets·Gleb Finkelstein·A. M. Chang
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Abstract

An Aluminum nanowire switches from superconducting to normal as the current is increased in an upsweep. The switching current (I_s) averaged over upsweeps approximately follows the depairing critical current (I_c) but falls below it. Fluctuations in I_s exhibit three distinct regions of behaviors and are non-monotonic in temperature: saturation well below the critical temperature T_c, an increase as T^{2/3} at intermediate temperatures, and a rapid decrease close to T_c. Heat dissipation analysis indicates that a single phase slip is able to trigger switching at low and intermediate temperatures, whereby the T^{2/3} dependence arises from the thermal activation of a phase slip, while saturation at low temperatures provides striking evidence that the phase slips by macroscopic quantum tunneling.

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Peng Li, Phillip M. Wu, Yuriy Bomze, Ivan V. Borzenets, Gleb Finkelstein, A. M. Chang. 2010-06-02. Single Phase Slip Limited Switching Current in 1-Dimensional Superconducting Al Nanowires. https://arxiv.org/abs/1006.0420

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