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arXiv 1702.02525cond-mat.mes-hall
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用量子点测量Majorana非定域性和自旋结构

Measuring Majorana non-locality and spin structure with a quantum dot

Elsa Prada, Ramón Aguado, Pablo San-Jose

摘要:

具有邻近诱导超导性的半导体纳米线中的鲁棒零偏压输运异常已经在各种实验中令人信服地证明。虽然这些都是兼容的存在马约拉纳零模式在纳米线的两端,他们的非局部性和拓扑保护的直接证明,现在需要的。在这里,我们表明,在纳米线的末端的量子点可以被用作一个强大的光谱工具,通过本地传输测量来量化的程度马约拉纳非局域性。此外,在库仑阻塞机制中,点子带隙态在单重态-二重态跃迁处的自旋极化允许点直接探测Majorana波函数的自旋结构,并间接测量纳米线的自旋-轨道耦合。

英文摘要:

Robust zero bias transport anomalies in semiconducting nanowires with proximity-induced superconductivity have been convincingly demonstrated in various experiments. While these are compatible with the existence of Majorana zero modes at the ends of the nanowire, a direct proof of their non-locality and topological protection is now needed. Here we show that a quantum dot at the end of the nanowire may be used as a powerful spectroscopic tool to quantify the degree of Majorana non-locality through a local transport measurement. Moreover, the spin polarization of dot sub-gap states at singlet-doublet transitions in the Coulomb blockade regime allows the dot to directly probe the spin structure of the Majorana wave function, and indirectly measure the spin-orbit coupling of the nanowire.

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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