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Anomalous Andreev bound state in noncentrosymmetric superconductors
Yukio Tanaka1, Yoshihiro Mizuno, Takehito Yokoyama
1Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
Abstract:
We study edge states of noncentrosymmetric superconductors where spin-singlet d-wave pairing mixes with spin-triplet p (or f)-wave one by spin-orbit coupling. For d(xy)-wave pairing, the obtained Andreev bound state has an anomalous dispersion as compared to conventional helical edge modes. A unique topologically protected time-reversal invariant Majorana bound state appears at the edge. The charge conductance in the noncentrosymmetric superconductor junctions reflects the anomalous structures of the dispersions, particularly the time-reversal invariant Majorana bound state is manifested as a zero bias conductance peak.
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