Switching currents limited by single phase slips in one-dimensional superconducting Al nanowires.

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2011-09-21

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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 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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10.1103/physrevlett.107.137004

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Li, Peng, Phillip M Wu, Yuriy Bomze, Ivan V Borzenets, Gleb Finkelstein and AM Chang (2011). Switching currents limited by single phase slips in one-dimensional superconducting Al nanowires. Physical review letters, 107(13). p. 137004. 10.1103/physrevlett.107.137004 Retrieved from https://hdl.handle.net/10161/19626.

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Scholars@Duke

Finkelstein

Gleb Finkelstein

Professor of Physics

Gleb Finkelstein is an experimentalist interested in physics of quantum nanostructures, such as Josephson junctions and quantum dots made of carbon nanotubes, graphene, and topological materials. These objects reveal a variety of interesting electronic properties that may form a basis for future quantum devices.

Chang

Albert M. Chang

Professor of Physics

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