# Position of coherence peaks in linear density of states for d-wave and extended s-wave symmetry

Where do the coherence peak singularities in the linear density of states lie for d-wave and extended s-wave pairing symmetries? In particular, what is the value of the gap between the coherence peaks in both cases in terms of pairing amplitude $$\Delta$$?

Given dispersion : $$E_{k}=\sqrt{(\epsilon_{k}-\mu)^2+\Delta_{k}^{2}}$$ where, $$\Delta_{k}=\Delta(\cos{k_{x}}\pm \cos{k_{y}})$$ for extended s-wave or d-wave symmetries.

And, $$\epsilon_{k}=-2t(\cos{k_{x}}+\cos{k_{y}})$$ as for simple square lattice.