Quasiparticle Resonant States Induced by a Unitary Impurity in a d-Wave Superconductor

Details Quasiparticle Resonant States Induced by a Unitary Impurity in a d-Wave Superconductor Quasiparticle Resonant States Induced by a Unitary Impurity in a d-Wave Superconductor

1999-09-24

arxiv.org/abs/cond-mat/9909363v2

Physics

Condensed Matter

Superconductivity

4 pages, 2 postscript figures, title changed and references added

Scientific paper

10.1103/PhysRevB.61.8667

The quasiparticle resonant states around a single nonmagnetic impurity with unitary scattering in a d-wave superconductor is studied by solving the Bogoliubov-de Gennes equations based on a t-J model. Both the spatial variation of the order parameter and the local density of states (LDOS) around the impurity have been investigated. We find: (i) A particle-hole symmetric system has a single symmetric zero-energy peak in the LDOS regardless of the size of the superconducting coherence length \xi_0; (ii) For the particle-hole asymmetric case, an asymmetric splitting of the zero-energy peak is intrinsic to a system with a small value of k_{F}\xi_0.

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