Volume 40, Number 2, October II 1997
|Page(s)||207 - 212|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Low-lying excitations around a single vortex in a d-wave superconductor
Department of Applied Physics, University of Tokyo,
7-3-1 Hongo Bunkyo-ku, Tokyo 113, Japan
2 Institute for Solid State Physics, University of Tokyo, 7-22-1 Roppongi Minato-ku, Tokyo 106, Japan
3 Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, USA
Corresponding author: email@example.com
Accepted: 10 September 1997
A full quantum-mechanical treatment of the Bogoliubov-de Gennes equation for a single vortex in a d-wave superconductor is presented. First, we find low-energy states extended in four diagonal directions, which have no counterpart in a vortex of s-wave superconductors. The four-fold symmetry is due to “quantum effect ”, which is enhanced when is small. On the other hand, when is large, the four-fold symmetry is suppressed. Second, for , a peak with a large energy gap is found in the density of states, which is due to the formation of the lowest bound states.
PACS: 74.60.Ec – Mixed state, critical fields, and surface sheath / 74.72.-h – High-Tc compounds
© EDP Sciences, 1997
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