Comment on ``Quasiparticle Spectra around a Single Vortex in a d-wave Superconductor''

Details Comment on ``Quasiparticle Spectra around a Single Vortex in a d-wave Superconductor'' Comment on ``Quasiparticle Spectra around a Single Vortex in a d-wave Superconductor''

1997-10-22

arxiv.org/abs/cond-mat/9710243v1

Physics

Condensed Matter

Superconductivity

1 page REVTeX, to appear in PRL

Scientific paper

10.1103/PhysRevLett.79.4513

In a recent Letter Morita, Kohmoto and Maki analyzed the structure of quasiparticle states near a single vortex in a d-wave superconductor using an approximate version of the Bogoliubov - de Gennes theory. Their principal result is the existence of a bound state within the core region at finite energy with full rotational symmetry, which they assert explains the recent scanning tunneling microscopy results on YBCO single crystals. Here we argue that the approximation used in this work is fundamentally inadequate for the description of a d-wave vortex and that the obtained circular symmetry of the local density of states is an unphysical artifact of this approximation.

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