Fig. 2: Effective masses and Fermi energies of the hole bands.

The effective masses of the α band in a, the β band in b and the γ hole band in c as a function of Te concentration. The solid lines in a and b are linear fits for each data set at different high symmetry points, Γ (red circles) and Z (blue squares). Data for β are from both polarisations, with open and solid symbols corresponding to linear vertical and linear horizontal, respectively. The solid line in c is a 5^th order polynomial fit to the data. Open diamond and triangles are from refs. ³¹ and³⁰, respectively. The Fermi energies of each band are plotted as a function of x in d (E_0,α), e (E_0,β) and f (E_0,γ), where data from refs. ³¹ and³⁰ are added. The solid lines in d and e are linear fits, while the solid line in f is described by a phenomenological model detailed in the Discussion. The error bars in all plots are calculated from the covariance values produced within the non-linear least squares fitting function.