Low-energy quasiparticle states at superconductor-CDW interfaces

Abstract

Quasiparticle bound states are found theoretically on transparent interfaces of d-wave superconductors (dSC) with charge density wave solids (CDW), as well as s-wave superconductors (sSC) with d-density waves (DDW). These bound states represent a combined effect of Andreev reflection from the superconducting side and an unconventional quasiparticle Q-reflection from the density wave solid. 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.

6 pages, 2 figures

References in corpus (12)

• Hidden Order in the Cuprates
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Degenerate ground state in a mesoscopic YBaCuO grain boundary Josephson junction
• Josephson currents through spin-active interfaces
• Interplay of spin-discriminated Andreev bound states forming the 0-$\pi$ transition in Superconductor-Ferromagnet-Superconductor Junctions
• Spin-dependent quasiparticle reflection and bound states at interfaces with itinerant antiferromagnets
• Quasiparticle Interface States in Junctions Involving d-Wave Superconductors
• The Superfluid Density in the D-density-wave Scenario
• DDW Order and its Role in the Phase Diagram of Extended Hubbard Models
• Absence of the d-Density Wave State in 2D Hubbard Model
• Superfluid density in the underdoped YBa_2Cu_3O_{7-x}: Evidence for d-density wave order of pseudogap
• Character of electron reflection at a normal metal-Peierls semiconductor boundary

Cited by in corpus (4)

• Bound states at the interface between antiferromagnets and superconductors
• Proximity effect in ferromagnet/superconductor hybrids: from diffusive to ballistic motion
• Scanning tunneling spectroscopy characterization of the pseudogap and the x = 1/8 anomaly in La2-xSrxCuO4 thin films
• Dephasing of Andreev pairs entering a charge density wave