Anomalous Andreev bound state in noncentrosymmetric superconductors.
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.
Tanaka
Yukio
Y
Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
Mizuno
Yoshihiro
Y
Yokoyama
Takehito
T
Yada
Keiji
K
Sato
Masatoshi
M