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## Main Question or Discussion Point

Hi

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(

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?