Switching currents limited by single phase slips in one-dimensional superconducting Al nanowires.
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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.
SubjectScience & Technology
Published Version (Please cite this version)10.1103/physrevlett.107.137004
Publication InfoLi, Peng; Wu, Phillip M; Bomze, Yuriy; Borzenets, Ivan V; Finkelstein, Gleb; & Chang, AM (2011). Switching currents limited by single phase slips in one-dimensional superconducting Al nanowires. Physical review letters, 107(13). pp. 137004. 10.1103/physrevlett.107.137004. Retrieved from https://hdl.handle.net/10161/19626.
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Professor of Physics
Professor of Physics
Gleb Finkelstein is an experimental physicist interested in inorganic and biologically inspired nanostructures: carbon nanotubes, graphene, and self-assembled DNA 'origami'. These objects reveal a variety of interesting electronic properties that may form a basis for future detectors and sensors, or serve as individual devices in quantum information processing.
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