High Angular Momentum Core States and Impurity Effects in the Mixed State of d-Wave Superconductors

Details High Angular Momentum Core States and Impurity Effects in the Mixed State of d-Wave Superconductors High Angular Momentum Core States and Impurity Effects in the Mixed State of d-Wave Superconductors

2001-09-26

arxiv.org/abs/cond-mat/0109503v1

Physics

Condensed Matter

Superconductivity

5 pages, 2 color figures

Scientific paper

The local quasiparticle spectra around the vortex core of a d-wave superconductor in the mixed state is studied by solving the lattice Bogoliubov-de Gennes equations self-consistently. It is shown that in addition to the zero-energy states, there also exist core states of high angular momentum. A nonmagnetic unitary impurity sitting at the core center is nondestructive to these core states and the zero-energy resonant state induced by itself is still visible in the local quasiparticle spectrum. The calculated imaging shows a fourfold ``star'' shape of the local density of states whose orientation is energy dependent. It is also found that, although the zero-energy states are extended, the core states of finite energy level could be localized.

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