- #1

Josh1079

- 47

- 0

## Homework Statement

1. For a simple cubic lattice with a lattice constant of

*a*, the energy band can be expressed as:E = Acos(k

_{x}a)cos(k

_{y}a)cos(k

_{z}a) + B.

(a) Suppose the effective mass for the electron at conduction band is m* = -ħ

^{2}/2a

^{2}, find A.

## Homework Equations

## The Attempt at a Solution

I know the effective mass equation and how the effective mass tensor is calculated, but I can't really see how does the effective mass appear to be as indicated(m* = -ħ

^{2}/2a

^{2}).

Thanks!