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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Majorana zero modes in Dirac semimetal Josephson junctions
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APS -APS March Meeting 2017 - Event - Majorana zero modes in Dirac semimetal Josephson junctions

机译：APS -APS 2017年3月会议-事件-Dirac半金属约瑟夫森结中的马约拉纳零模

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摘要

We have realized proximity-induced superconductivity in a Dirac semimetal and revealed the topological nature of the superconductivity by the observation of Majorana zero modes. As a Dirac semimetal, Bi$_{0.97}$Sb$_{0.03}$ is used, where a three-dimensional Dirac cone exists in the bulk due to an accidental touching between conduction and valence bands. Electronic transport measurements on Hall-bars fabricated out of Bi$_{0.97}$Sb$_{0.03}$ flakes consistently show negative magnetoresistance for magnetic fields parallel to the current, which is associated with the chiral anomaly. In perpendicular magnetic fields, we see Shubnikov-de Haas oscillations that indicate very low carrier densities. The low Fermi energy and protection against backscattering in our Dirac semimetal Josephson junctions provide favorable conditions for a large contribution of Majorana zero modes to the supercurrent. In radiofrequency irradiation experiments, we indeed observe these Majorana zero modes in Nb-Bi$_{0.97}$Sb$_{0.03}$-Nb Josephson junctions as a 4$pi$ periodic contribution to the current-phase relation.
机译：我们已经在狄拉克半金属中实现了邻近感应超导性，并通过观察马约拉纳零模揭示了超导性的拓扑性质。作为Dirac半金属，使用Bi $ _ {0.97} $ Sb $ _ {0.03} $，其中由于导带和价带之间的意外接触而在主体中存在三维Dirac锥。用Bi_ {0.97} $ Sb $ _ {0.03} $薄片制成的霍尔棒上的电子传输测量结果始终显示出与电流平行的磁场的负磁阻，这与手征异常有关。在垂直磁场中，我们看到Shubnikov-de Haas振荡表明载流子密度很低。 Dirac半金属约瑟夫逊结中的低费米能量和防止背向散射为马里亚纳零模对超电流的巨大贡献提供了有利条件。在射频辐照实验中，我们确实在Nb-Bi $ _ {0.97} $ Sb $ _ {0.03} $-Nb Josephson结中观察到这些Majorana零模式，这是对电流-相位关系的4πpi$周期性贡献。

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