Quantitative analysis of quantum phase slips in superconducting Mo 76Ge 24 nanowires revealed by switching-current statistics

T. Aref, A. Levchenko, V. Vakaryuk, A. Bezryadin

Research output: Contribution to journalArticle

Abstract

We measure quantum and thermal phase-slip rates using the standard deviation of the switching current in superconducting nanowires. Our rigorous quantitative analysis provides firm evidence for the presence of quantum phase slips (QPSs) in homogeneous nanowires at high bias currents. We observe that as temperature is lowered, thermal fluctuations freeze at a characteristic crossover temperature T q, below which the dispersion of the switching current saturates to a constant value, indicating the presence of QPSs. The scaling of the crossover temperature T q with the critical temperature T c is linear, T qT c, which is consistent with the theory of macroscopic quantum tunneling. We can convert the wires from the initial amorphous phase to a single-crystal phase, in situ, by applying calibrated voltage pulses. This technique allows us to probe directly the effects of the wire resistance, critical temperature, and morphology on thermal and quantum phase slips.

Original languageEnglish (US)
Article number024507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number2
DOIs
StatePublished - Jul 9 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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