安德烈耶夫束缚态的耗散量子力学
Dissipative quantum mechanics of Andreev bound states
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中文总结 AI 辅助
本文提出用安德烈耶夫束缚态的耗散量子动力学描述超导结中的交流约瑟夫森效应，评估了任意透射率下的非平衡电流-相位关系，并识别出亚欧姆型相位相关耗散电流贡献。
中文摘要 AI 辅助
我们提出了一种微观方案，该方案能够用亚能隙安德烈耶夫束缚态的耗散量子动力学来描述超导结中的交流约瑟夫森效应。这种方法对于在亚能隙偏压电压下具有高透明度的结特别有用，在这种情况下，安德烈耶夫能级之间的朗道-齐纳隧穿与由于准粒子逃逸到连续谱而导致的不稳定性之间的非平凡组合可能发挥重要作用。在低偏压区域，我们评估了任意透射率下超导结的非平衡电流-相位关系，并识别出一种由超导能隙边缘附近的准粒子动力学控制的亚欧姆型相位相关耗散电流贡献。
英文摘要
We propose a microscopic scheme that allows to describe ac Josephson effect in superconducting junctions in terms of dissipative quantum dynamics of subgap Andreev bound states. This approach is particularly useful for highly transparent junctions at subgap bias voltages in which case a non-trivial combination of Landau-Zener tunneling between Andreev levels and their instability due to quasiparticle escape into continuum may play an important role. In the low bias regime, we evaluate the non-equilibrium current-phase relation of superconducting junctions at arbitrary transmissions and identify a sub-Ohmic phase-dependent dissipative contribution to the current controlled by quasiparticle dynamics near the superconducting gap edge.
发表机构
- I.E.Tamm Department of Theoretical Physics, P.N.Lebedev Physical Institute（P.N.列别杰夫物理研究所I.E.塔姆理论物理系）
- National Research University Higher School of Economics（国立高等经济大学）
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