Inverted band structure of type-III HgTe/Hg1-xCdxTe superlattices and its temperature dependence -: art. no. 035202

Intersubband transitions in (001)- and (112)B-orientated HgTe/Hg1-xCdxTe superlattices with an inverted band structure have been investigated in order to determine their band structure. The results are compared with k-p calculations in the envelope function approximation using the full 8X8 Kane Hamiltonian. Up to six intersubband transitions and their temperature dependences have been observed. Three transitions display a positive dependence on temperature and the remaining three a negative dependence. Agreement with theory for all observed transitions and both orientations is good. Due to the close proximity of the first conduction subband and the Fermi energy, the influence of the charge carriers must be taken into account.