Abstract
We theoretically study the escape rate of S → R switching (from superconducting S state to resistive R state) in Josephson junction (JJ) formed by s-wave single-band (SB) and two-band (TB) superconductors (SB/TB junctions). The escape rate is calculated in terms of effective critical current in thermal activation (TA) and macroscopic quantum tunneling (MQT) regimes. It was shown that escape rate can exhibit qualitative features in the case of s+--wave symmetry in TB superconductors, while s++-wave is identical to JJ between SB s-wave superconductors. Leggett modes in TB superconductors lead to enhancement of escape rate in two-channel JJ in comparison with single-channel junctions.
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More From: Physica C: Superconductivity and its Applications
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