Far-infrared magnetotransmission of strained epitaxially grown n-type PbTe was investigated using experiments in the Faraday (B) and Voigt (B[11̄0]) configurations. The analysis of the data is based on a complete frequency-dependent dielectric function for both magnetic-field configurations, taking into account explicitly the effects of the strain splitting of the four L states in the Brillouin zone. The experiments were performed at temperatures ranging from 1.4 K to 20 K and the dependence of the Fermi energy on magnetic field, temperature, as well as the strain splitting were calculated within the Mitchell-Wllis kp scheme. It is shown that this method is capable of determining strain-induced shifts of equivalent L states with an accuracy of about 0.5 meV. These techniques are applicable to other strained many-valley systems such as Si/SiGe.
ASJC Scopus subject areas
- Condensed Matter Physics