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arXiv 2301.06261cond-mat.mes-hallcond-mat.supr-con
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使用费米子模式揭示马约拉纳零模的非平庸融合规则

Unveiling nontrivial fusion rule of Majorana zero mode using a fermionic mode

Yu Zhang, Xiaoyu Zhu, Chunhui Li, Juntao Song, Jie Liu, X. C. Xie

AI总结:

本文提出将费米子模式连接到单个马约拉纳零模,通过调制能级与耦合实现零或整数电荷泵浦,从而揭示非平庸融合规则,并提供区分马约拉纳模式与平庸Andreev束缚态的可行方法。

摘要:

融合马约拉纳零模会导致多种结果,这是非阿贝尔任意子独有的性质。成功演示这一非平庸融合规则将是拓扑量子计算发展的标志。在此我们表明,只需将一个费米子模式连接到单个马约拉纳零模即可实现这一点。通过在不同序列下调制该费米子模式的能级及其与马约拉纳模式的耦合,我们证明了当选择不同的融合回路时,可以实现零或整数的电荷泵浦。这种融合回路与马约拉纳模式的非平庸融合规则密切相关,并且完全由参数空间中零能处的交叉点决定。最后,我们在耦合到量子点的纳米线拓扑超导体中演示了我们的方案。我们表明,对于真实系统中的MZMs,无论FM态的初始条件如何,电荷泵浦都是鲁棒的,这与平庸的Andreev束缚态情况相反。这提供了一种区分马约拉纳模式和平庸Andreev束缚态的可行方法。

英文摘要:

Fusing Majorana zero modes leads to multiple outcomes, a property being unique to non-Abelian anyons. Successful demonstration of this nontrivial fusion rule would be a hallmark for the development of topological quantum computation.Here we show that this can be done by simply attaching a fermionic mode to a single Majorana zero mode. Through modulation of the energy level of this fermionic mode as well as its coupling with the Majorana mode in different sequences, we show that a zero or integer charge pumping can be realized when different fusion loops are chosen. Such fusion loops are intimately related with the nontrivial fusion rule of Majorana modes and are solely determined by the crossings at zero energy in the parameter space. Finally we demonstrate our proposal in a nanowire-based topological superconductor coupled to a quantum dot. We show that the charge pumping is robust for MZMs in the real system irrespective of the initial condition of FM state, contrary to the case for trivial Andreev bound states. This provides a feasible way to distinguish Majorana modes from trivial Andreev bound states.

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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