Anomalous quantized conductance in a half-metal/topological superconductor/half-metal junction.
The composite topological superconductor (TS), which is made of one-dimensional spin-orbit coupled nanowire with proximity-induced superconductivity from an s-wave superconductor, is not a pure p-wave superconductor, but has a suppressed s-wave pairing. We calculate the conductance spectrum of a half-metal/TS/half-metal junction in order to probe the pairing states and the spin texture of the p-wave pairing. It is found that, besides the regular quantized conductance peak contributed by Majorana fermions (MFs) when the half-metal magnetization is parallel to the MF spin, an anomalous quantized conductance peak exists when they are almost antiparallel. The physical origin is the MF-assisted local Andreev reflection to condense s-wave pairings. The anomalous quantized conductance is also confirmed by the Kitaev's p-wave model with a nonzero s-wave pairing. The findings might provide a new way to find the MF.
Department of Physics, Southeast University, Nanjing 210096, People's Republic of China.
C D
CD
Ren
K S
KS
Chan
J
J
Wang
D003198:Computer Simulation; D004553:Electric Conductivity; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D011789:Quantum Theory; D012666:Semiconductors
D008670:Metals