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E(kx; ky; kz) = Ei - A - 8t[cos(pi*kx)cos(pi*ky) + cos(pi*ky)cos(pi*kz) + cos(pi*kz)cos(pi*kx)]

where kx; ky; kz are express in units of 2*pi/a .

Sketch this band dispersion (a) between the (capital Gamma) point (kx = ky = kz = 0) and the X point

(kx = 1; ky = kz = 0) (located on the square face of the Brillouin zone), and (b) between

the point and the L point (kx = ky = kz = 1=2) (located on the hexagonal face of the

Brillouin zone).

I am not sure even how to start the sketch of this, do I need to know Ei and A, or can I be alot more simple when just sketching something.

I am just really bad a graphs in reciprocal space, and my lecturer wasn't very helpful.

Any help will be greatly appreciated!