the light hole effective mass, m
lh
, are
approximately equal and proportional to the band gap energy. For GaAs, which has a band gap
energy of ~ 1.5 eV, the actual values are m
e
~ 0.069 m
o
and m
lh
~ 0.09 m
o
, where m
o
is the free
electron mass. The heavy hole effective mass, m
hh
, is typically more comparable to the free
electron mass (m
hh
~ 0.35 m
o
for the most common situation in quantum wells)