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arXiv 1208.5306cond-mat.supr-con
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超导拓扑绝缘体中的反常约瑟夫森电流

Anomalous Josephson current in superconducting topological insulator

Ai Yamakage, Masatoshi Sato, Keiji Yada, Satoshi Kashiwaya, Yukio Tanaka

摘要:

研究了超导拓扑绝缘体(STI)表面螺旋马约拉纳费米子对超导体约瑟夫森电流的影响.由于自旋和动量的方向彼此锁定,因此本STI中的表面态具有自旋螺旋性。STI/s波超导结中的约瑟夫森电流-相位关系由于镜像对称性而显示出稳健的sin(2 π),其中π表示两个超导体之间的宏观相位差。相反,在STI/STI结的最大约瑟夫森电流表现出非单调的温度依赖性取决于两个表面态的相对自旋螺旋度。检测到这些功能资格作为独特的实验证据,在STI的螺旋马约拉纳费米子的识别。

英文摘要:

We investigate the effect of helical Majorana fermions at the surface of superconducting topological insulators (STI) on the Josephson current by referring to possible pairing states of Cu-doped Bi2Se3. The surface state in the present STI has a spin helicity because the directions of spin and momentum are locked to each other. The Josephson current-phase relation in an STI/s-wave superconductor junction shows robust sin(2ϕ) owing to mirror symmetry, where ϕdenotes the macroscopic phase difference between the two superconductors. In contrast, the maximum Josephson current in an STI/STI junction exhibits a nonmonotonic temperature dependence depending on the relative spin helicity of the two surface states. Detecting these features qualifies as distinct experimental evidence for the identification of the helical Majorana fermion in STIs.

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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