We study the quasiparticle spectrum around a single vortex line in a superconductor with dₓ²-y² symmetry. For E(T), the density of states around a vortex exhibits a fourfold symmetry, in sharp constrast to a superconductor with s-wave symmetry. This should be readily seen in scanning tunneling microscopy experiments.
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Schopohl et al. (1995) studied this question.
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