Inversion Asymmetry in Hg(1-x)Mn(x)Se

摘要

Shubnikov-de Haas (SdH) measurements have been very important in determining the electronic structures of semiconductor and semimetallic compounds. When measurements were made on the diluted magnetic semiconductor compounds Hg(1-x)Mn(x)Se and Hg(1-x)Fe(x)Se, the beats in the SdH data were observed to have a temperature dependence; i.e., the nodes shifted to lower magnetic fields with increasing temperature. We use the k.p Pidgeon-Brown model with exchange included to fit Shubnikov-de Haas (SdH) data for Hg1-xMnxSe for x=0.025. We find that inversion-asymmetry parameters (IAP's) are needed to explain the beats in the data. We demonstrate that the IAP's introduce two frequencies into the SdH oscillations and that the temperature dependence of the resulting beats is solely due to the exchange interaction between the electrons and the magnetic ions in the sample. We further calculate the Fermi surface and small-k band structure.