Low-energy quasiparticle states at superconductor/charge-density-wave interfaces
I. V. Bobkova, Yu. S. Barash
DOI 10.1103/PhysRevB.71.144510 · Physical Review B
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Abstract
Quasiparticle bound states are found theoretically on transparent interfaces of d-wave superconductors with charge-density-wave (CDW) solids, as well as s-wave superconductors with d-density waves (DDWs). These bound states represent a combined effect of Andreev reflection from the superconducting side, unconventional quasiparticle Q reflection from the density-wave solid, and standard specular reflection. If the order parameter for a density-wave state is much less than the Fermi energy, bound states with almost zero energy take place for an arbitrary orientation of symmetric interfaces. For larger values of the order parameter, dispersionless zero-energy states are found only on (110) interfaces. Two dispersive energy branches of subgap quasiparticle states are obtained for (100) symmetric interfaces. Andreev low-energy bound states, taking place in junctions with CDW or DDW interlayers, result in anomalous junction properties, in particular, the low-temperature behavior of the Josephson critical current.
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