科研之友
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摘要
The dynamical properties of hybrid normal metal/superconductor structures have recently come into research focus both experimentally and theoretically. Recent experimental studies of the coherent admittance Y (omega) of SNS rings as a function of the phase difference phi(0) are still not fully understood. Here we concentrate on the linear response regime, calculating Y (omega) by solving the Usadel equations, linearized in an electric field. Partially reproducing previously known results, we find qualitatively different behavior in the collisionless regime of tau(-1)(in) << omega less than or similar to E-Th and high temperature T >> E-Th and low temperature T less than or similar to E-Th near the minigap closing phi(0) similar to pi. We find that the dissipative part ReY (omega) peaks when the minigap closes (at a phase difference of pi) even at high temperatures, when the equilibrium supercurrent is fully suppressed.
- 出版日期2015-2-25
