Supercurrent blockade in Josephson junctions with a Majorana wire
Supercurrent blockade in Josephson junctions with a Majorana wire
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DOI：
10.1103/physrevb.85.104514
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发表时间：
2012-02
影响因子：
3.7
通讯作者：
A. Zazunov;R. Egger
中科院分区：
文献类型：
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作者：
A. Zazunov;R. Egger
本文研究了具有马约拉纳费米子端态的拓扑非平凡超导线与s波BCS超导电极隧道耦合的约瑟夫森效应。在S-TS结中，在相当一般的条件下不可能有超电流流动。对于S-TS-S结，体TS准粒子必须是可接近的以具有约瑟夫森效应。在无相互作用的情况下，我们推导出精确的电流-相位关系（CPR），并发现弱隧道耦合的负临界电流的\pi周期行为。充电效应则导致异常CPR $I（\varphi）=I_c \cos\varphi$，其中奇偶敏感临界电流I_c提供了马约拉纳态的签名。
We study the Josephson effect for a topologically nontrivial superconducting (TS) wire with Majorana fermion end states and tunnel-coupled to s-wave BCS superconducting (S) electrodes. In an S-TS junction, no supercurrent flow is possible under fairly general conditions. For the S-TS-S junction, bulk TS quasiparticles must be accessible to have a Josephson effect. In the noninteracting case, we derive the exact current-phase relation (CPR) and find \pi-periodic behavior with negative critical current for weak tunnel couplings. Charging effects then cause the anomalous CPR $I(\varphi)=I_c \cos\varphi$, where the parity-sensitive critical current I_c provides a signature for Majorana states.