Hello, I am trying to display a contour plot and vary some values to see how the Fermi surface would chance but for some reason the plot wont show up, any ideas of what I am missing?
ax = 2 ay;
ty = 2 tx;
co = 20;
Manipulate[
ContourPlot[
co - 2 tx Cos[kx ax] - 2 ty Cos[ky ay], {kx, 0, 2 Pi}, {ky, 0,
2 Pi}], {ay, 0, 10}, {tx, 0, 10}]
