Superconducting d-wave dispersion

[Niles]

Hi

In litterature, I have noticed some authors write the dispersion for the d-wave gap as Δ(k)=Δ[cos(k_x)-cos(k_y)]/2, and some write it as Δ(k)=2Δ[cos(k_x)-cos(k_y)]. Where does this difference come from?

 

[ZapperZ]

Hi

In litterature, I have noticed some authors write the dispersion for the d-wave gap as Δ(k)=Δ[cos(k_x)-cos(k_y)]/2, and some write it as Δ(k)=2Δ[cos(k_x)-cos(k_y)]. Where does this difference come from?

It would be helpful if you actually cite the references. There's no way for us to know how the gap value is defined in those papers. Most of the papers defined it using the first.

BTW, I don't recall seeing this being called the "dispersion". I've seen it called as the gap symmetry or the order parameter symmetry, but never "dispersion".

Zz.