Conduction Band Structure of Tellurium

Abstract

The structure of conduction band edge of tellurium was investigated experimentally. The interband magneto-absorption was measured and the two series of the absorption lines were observed for H // c . The magnetic field dependence of the peaks for H ⊥ c was more complicated reflecting the valence band structure. The conduction band structure was derived theoretically with the effective Hamiltonian method, and it indicated that the k -linear terms play an important role, particularly in the appearance of the above two series. The comparison of theoretical and experimental results yielded determination of the band parameters, which reproduce well the experimental results. As a result, it was found that the conduction band consists of two ellipsoids with effective masses at the minima m ⊥ =0.104 m 0 , m // =0.070 m 0 and with g // =-9.86, | g ⊥ |=1.9. The binding energy of an exciton is calculated to be 0.69 meV and the exciton band has the double minimum, reflecting the large k -linear term in the valence band,