Recent content by paullondon

Good evening , I will resolve a small problem but I don't know how I can do, In l approximation of the strong coupling, the strucure of band of the electrons in a certain crystal is given by: E(k)=-[E1*cos(kx.a)+E2*cos(ky.b)+E3*cos(kz.c) ] Show that for a band very little filled, the...