Q34 the dispersion relation of electrons in a 3-dimensional lattice in the tight binding approximation is given by, e=acosk,a +b cos k a+y cos k.a where a is th

Q34 The dispersion relation of electrons in a 3-dimensional lattice in the tight binding approximation is given by, E=aCosk,a +B cos k a+y cos k.a where a is the lattice constant and a, B,y are constants with dimension of energy. The ( effective mass tensor at the corner of the first Brillouin zone 0 (-1/a 0 0 h -1/a 0 (a) 0 -1/p 0 (b) (b) 0 -1/ 0 0 0 1/7) 0 -1/y) (1/a 0 () 0 1/p 0 (1/a 0 0 h 0 (d) 0 1/ 0 (d) a 0 0 1/y) 0 0 -1/y Anş.: (c)