Terahertz magnetospectroscopy of pseudo-relativistic fermions in HgCdTe alloys under hydrostatic pressure

We report on terahertz (THz) magnetospectroscopy of Hg
1-x
Cd
x
Te (MCT) epitaxial alloys with various cadmium content (from x = 0.15 to x = 0.17). Additionally some magnetospectroscopy investigations were performed as a function of hydrostatic pressure. We show that all experimental data can be perfectly interpreted within the pseudo-relativistic description assuming E
g
= 2mc
²
where E
g
is the band gap, m is the fermion rest mass and c is the constant. Remarkably, the experimental results for all the samples are consistently described by using constant velocity c = 1.0•10
⁶
m/s (close to Fermi velocity in graphene) independent of hydrostatic pressure and Cd content.