Phase-dependent noise in Josephson junctions

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Researchers

Research units

  • University of California at San Diego

Abstract

In addition to the usual superconducting current, Josephson junctions (JJs) support a phase-dependent conductance related to the retardation effect of tunneling quasi-particles. This introduces a dissipative current with a memory-resistive (memristive) character and thus should also affect the current noise. By means of the microscopic theory of tunnel junctions we compute the complete current autocorrelation function of a Josephson tunnel junction and show that this memristive component gives rise to a non-stationary, phase-dependent noise. As a consequence, dynamic and thermal noise necessarily show a phase dependence otherwise absent in nondissipative JJ models. This phase dependence may be realized experimentally as a hysteresis effect if the unavoidable time averaging of the experimental probe is shorter than the period of the Josephson phase.

Details

Original languageEnglish
Article number10601
Number of pages6
JournalEUROPEAN PHYSICAL JOURNAL: APPLIED PHYSICS
Volume81
Issue number1
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Condensed Matter - Mesoscale and Nanoscale Physics

ID: 11061952