Domain walls in superconductors: Andreev bound states and tunneling features

Abstract

Domain walls can be formed in superconductors with a discrete degeneracy of the ground state, for instance, due to the breaking of time reversal symmetry. We study all cases where the formation of domain walls is possible in a tetragonal superconductor with the point group $D_{4h}$. We discuss both triplet and mixed singlet order parameters. It is found that in all cases the domain walls support subgap Andreev bound states, whose energies strongly depend on the direction of semiclassical propagation. The bound state contribution to the density of quasiparticle states exhibits peculiar features, which can be observed in tunneling experiments.

10 pages 13 figures

References in corpus (6)

• Observation of broken time-reversal symmetry in the heavy fermion superconductor UPt${}_3$
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Inter-pocket pairing and gap symmetry in Fe-based superconductors with only electron pockets
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Universal V-shaped temperature-pressure phase diagram in the iron-based superconductors KFe2As2, RbFe2As2, and CsFe2As2
• Anomalous Transport through the p-Wave Superconducting Channel in the 3-K Phase of Sr2RuO4

Cited by in corpus (3)

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