The mobility of electrons in undoped gallium arsenide is
8800 cm2/Vs
and their effective mass is 0.067 m0. What is the
mean free time between scattering events?
Answer: Using the expression for the mobility
and m* = 0.067 x m0,
where
m0 = 9.1 x 10-31 kg and
q = 1.6 x 10-19 C, one
finds that
t = 0.335 ps.
