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arXiv 1503.04207cond-mat.mes-hall
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约瑟夫森结中费米子-宇称开关的猝灭动力学

Quench dynamics of fermion-parity switches in a Josephson junction

B. Tarasinski, D. Chevallier, Jimmy A. Hutasoit, B. Baxevanis, C. W. J. Beenakker

摘要:

约瑟夫森结可以被驱动通过转变,其中超导凝聚体倾向于奇数个电子而不是偶数个电子。在基态费米子宇称的这种转换中,安德烈耶夫束缚态穿过费米能级,产生零模,可以通过与接地金属的点接触来探测。我们计算了超导体和金属之间随时间变化的电荷转移的线性扫描通过过渡。一个单一的准粒子与电荷$Q$交换取决于金属的耦合能量$γ_1,γ_2$的零模式的马约拉纳运营商。对于单通道点接触,$Q$等于慢驱动的绝热极限中的电子电荷$e$,而在相反的淬灭极限中,$Q=2e\sqrt{γ_1γ_2}/(γ_1+γ_2)$在$0$和$e$之间变化。这提供了一种按需产生单个电荷中性准粒子的方法。

英文摘要:

A Josephson junction may be driven through a transition where the superconducting condensate favors an odd over an even number of electrons. At this switch in the ground-state fermion parity, an Andreev bound state crosses through the Fermi level, producing a zero-mode that can be probed by a point contact to a grounded metal. We calculate the time-dependent charge transfer between superconductor and metal for a linear sweep through the transition. One single quasiparticle is exchanged with charge $Q$ depending on the coupling energies $γ_1,γ_2$ of the metal to the Majorana operators of the zero-mode. For a single-channel point contact, $Q$ equals the electron charge $e$ in the adiabatic limit of slow driving, while in the opposite quenched limit $Q=2e\sqrt{γ_1γ_2}/(γ_1+γ_2)$ varies between $0$ and $e$. This provides a method to produce single charge-neutral quasiparticles on demand.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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