科研之友
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摘要
We study the Josephson effect of d-wave superconductor (DS)/ferromagnet insulator (FI)/DS junctions on a surface of topological insulator (TI). We calculate Josephson current I (phi) for various orientations of the junctions where. is the macroscopic phase difference between two DSs. In certain configurations, we find anomalous current-phase relation I (phi) = -I (-phi + pi) with 2 pi periodicity. In the case where the first-order Josephson coupling is absent without magnetization in FI, I (phi) can be proportional to cos phi. In symmetric junctions, the magnitude of the obtained Josephson current is enhanced due to the zero-energy states on the edge of DS on TI. Even if we introduce an s-wave component of pair potential in DS, we can still expect the anomalous current-phase relation in asymmetric DS junctions with I (phi = 0) not equal 0. This can be used to probe the induced d-wave component of pair potential on a TI surface in high-T-c cuprate/TI hybrid structures.
- 出版日期2015-9-11
