共 27 条
Switching Currents Limited by Single Phase Slips in One-Dimensional Superconducting Al Nanowires
被引:69
作者:
Li, Peng
[1
]
Wu, Phillip M.
[1
]
Bomze, Yuriy
[1
]
Borzenets, Ivan V.
[1
]
Finkelstein, Gleb
[1
]
Chang, A. M.
[1
]
机构:
[1] Duke Univ, Dept Phys, Durham, NC 27708 USA
关键词:
ZERO-VOLTAGE STATE;
RESISTIVE TRANSITION;
QUANTUM;
WIRES;
JUNCTIONS;
D O I:
10.1103/PhysRevLett.107.137004
中图分类号:
O4 [物理学];
学科分类号:
0702 ;
摘要:
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 nonmonotonic 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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