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Assume a material has a given E-K diagram:

E(K)conduction = Ec + E1 * sin^2 (Ka)

E(K)valence = Ev - E2 * sin^2 (Ka)

a=0.5nm

E1 = 5eV

E2 = 4eV

I have to:

* sketch the E-K diagram for the first brillouin zone (-pi/a < k < pi/a). label axes, label Ec, Ev, energy bandwidth.

* find effective mass for the electron near bottom of conduction band

* find effective mass for holes near the top of the valence band

My questions:

How do I determine Ec and Ev to draw the diagram? Do I need to draw two E-K sketches or is it 1 big diagram?? What is the energy bandwidth? Is it the same as Eg (band gap?) which is Ec - Ev ?

How do I determine the effective masses?

I don't want anyone to just do the problem, but I looked through the textbook (typical overpriced McGraw Hill crap that shows you one thing and has homework problems that are 20 steps ahead of the basic crap they show). :yuck: