the light hole effective mass, m, 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 ~ 0.069 m
and m = 0.09 m
, where m is the free electron mass.
The heavy hole effective mass, m, is typically more comparable to the free
electron mass (m~ 0.35 m for the most common situation in quantum wells)