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The dispersion of Bogolyubov quasiparticles in a d-wave superconductor is

[tex]

E(\mathbf k) = \pm \sqrt{\varepsilon (\mathbf k)^2+\Delta (\mathbf k)^2},

[/tex]

where ε(k) is the normal-state dispersion and ∆(k) is the gap dispersion. My question is: The Fermi surface (FS) of the normal state is just ε(k). Is this also the FS of the superconductor?

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# Superconductors and Fermi surfaces

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