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Anomalous Josephson current in superconducting topological insulator

机译:超导拓扑绝缘子中的约瑟夫森电流异常

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摘要

We investigate the effect of helical Majorana fermions at the surface of superconducting topological insulators (STIs) on the Josephson current by referring to possible pairing states of Cu-doped Bi_2Se_3. 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 φ denotes 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.
机译:通过参考可能的Cu掺杂Bi_2Se_3的配对状态,我们研究了超导拓扑绝缘体(STI)表面的螺旋马约拉纳费米子对约瑟夫森电流的影响。由于自旋的方向和动量的方向彼此锁定,因此本发明的STI中的表面状态具有自旋螺旋性。由于镜像对称,STI / s波超导体结中的约瑟夫森电流-相位关系显示出稳健的sin(2φ),其中φ表示两个超导体之间的宏观相差。相比之下,STI / STI结中的最大约瑟夫森电流表现出非单调温度依赖性,这取决于两个表面状态的相对自旋螺旋度。检测这些特征可作为鉴定STI中马约拉螺旋藻的独特实验证据。

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