Manipulation of Majorana fermion, Andreev reflection and Josephson current on topological insulators

Details Manipulation of Majorana fermion, Andreev reflection and Josephson current on topological insulators Manipulation of Majorana fermion, Andreev reflection and Josephson current on topological insulators

2009-07-13

arxiv.org/abs/0907.2088v3

Physics

Condensed Matter

Superconductivity

Scientific paper

We study theoretically charge transport properties of normal metal (N) / ferromagnet insulator (FI) / superconductor (S) junction and S/FI/S junction formed on the surface of three-dimensional topological insulator (TI), where chiral Majorana mode (CMM) exists at FI/S interface. We find that CMM generated in N/FI/S and S/FI/S junctions are very sensitively controlled by the direction of the magnetization ${\bm m}$ in FI region. Especially, the current-phase relation of Josephson current in S/FI/S junctions has a phase shift neither 0 nor $\pi$, which can be tuned continuously by the component of ${\bm m}$ perpendicular to the interface.

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