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Nonequilibrium and relaxation effects in tunnel superconducting junctions

机译：隧道超导结中的不足和放松效果

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The specific property of a planar tunnel junction with thin-film diffusive plates and long enough leads is an essential enhancement of its transmission coefficient compared to the bare transparency of the tunnel barrier [1, 2]. In voltage-biased junctions, this creates favorable conditions for strong nonequilibrium of quasiparticles in the junction plates and leads, produced by multiparticle tunneling. We study theoretically the interplay between the nonequilibrium and relaxation processes in such junctions and found that nonequilibrium in the leads noticeably modifies the current-voltage characteristic at eV > 2 Delta, especially the excess current, whereas strong diffusive relaxation restores the result of the classical tunnel model. At eV <= 2 Delta, the diffusive relaxation decreases the peaks of the multiparticle currents. The inelastic relaxation in the junction plates essentially suppresses the n-particle currents (n > 2) by the factor n for odd and n/2 for even n. The results may be important for the problem of decoherence in Josephson-junction based superconducting qubits.
机译：与薄膜扩散板的平面隧道结的具体性能和足够长的引线是与隧道屏障的裸露透明度相比其透射系数的基本增强[1,2]。在电压 - 偏置的结中，这为通过多粒隧道产生的连接板中的Quasiply Qualiply Qualiplium，这产生了有利条件。从理论上研究了这种连接中的非QuibiRim和弛豫过程之间的相互作用，发现导线中的非预测显着修改EV> 2三角洲的电流 - 电压特性，尤其是过电流，而强大的扩散弛豫恢复古典隧道的结果模型。在EV <= 2三角洲，漫射弛豫减少了多粒电流的峰。结板中的非弹性弛豫基本上抑制了奇数和N / 2的因子n的N-粒子电流（n> 2），甚至没有n。结果对于基于Josephson-Chncipt的超导Qubits中的失脱问题可能是重要的。

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