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arXiv 2107.05293cond-mat.supr-con
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无分数约瑟夫森效应的分数Shapiro阶梯

Fractional Shapiro steps without fractional Josephson effect

Artem V. Galaktionov, Andrei D. Zaikin

摘要:

人们普遍认为,包含拓扑绝缘体和托管马约拉纳类束缚态的超导结可能会表现出不寻常的“分数”($4π$ -周期性)交流约瑟夫森效应。因此,“分数”夏皮罗步骤的电流-电压特性的这种结预计会发生外部微波辐射。在这里,我们微观评估Shapiro步骤拓扑平凡的高度透明的超导弱连接。在我们的分析中恢复的关键特征-包括,例如,所谓的“缺失的”夏皮罗台阶--结果与在拓扑约瑟夫森结中观察到的相似。我们的研究结果表明,谨慎是必要的,而解释超导弱连接的Majorana物理方面的实验结果。

英文摘要:

It is widely believed that superconducting junctions involving topological insulators and hosting Majorana-like bound states may exhibit unusual "fractional" ($4π$-periodic) ac Josephson effect. Accordingly, "fractional" Shapiro steps on the current-voltage characteristics of such junctions are expected to occur under external microwave radiation. Here, we microscopically evaluate Shapiro steps in topologically trivial highly transparent superconducting weak links. The key features recovered within our analysis -- including, e.g., the so-called "missing" Shapiro steps -- turn out to be similar to those observed in topological Josephson junctions. Our results demonstrate that caution is needed while interpreting experimental results for superconducting weak links in terms of Majorana physics.

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