Physics – Condensed Matter – Superconductivity
Scientific paper
2010-11-04
Phys. Rev. B 85, 014503 (2012)
Physics
Condensed Matter
Superconductivity
8 pages, 5 figures; version as published
Scientific paper
10.1103/PhysRevB.85.014503
Using a discrete-lattice approach, we calculate the conductance spectra between a normal metal and an s-wave Larkin-Ovchinnikov (LO) superconductor, with the junction interface oriented {\em along} the direction of the order-parameter (OP) modulation. The OP sign reversal across one single nodal line can induce a sizable number of zero-energy Andreev bound states around the nodal line, and a hybridized midgap-states band is formed amid a momentum-dependent gap as a result of the periodic array of nodal lines in the LO state. This band-in-gap structure and its anisotropic properties give rise to distinctive features in both the point-contact and tunneling spectra as compared with the BCS and Fulde-Ferrell cases. These spectroscopic features can serve as distinguishing signatures of the LO state.
Cui Qinghong
Hu Chia-Ren
Wei J. Y. T.
Yang Kun
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