Far-infrared study of the zeeman effect of indirect excitons in germanium

A series of experiments was performed to study the Zeeman effect of the lower quantum levels of indirect excitons in Ge with the use of infrared absorption in the presence of small magnetic fields which varied from 0 to 7 kOe in steps of 0.5 kOe. The magnetic fields were applied parallel to the 100 crystallographic direction, in the Faraday geometry. An analysis of the observed behavior of the transitions was done using a simplified magnetic Hamiltonian. In this Hamiltonian we include the interaction of the field with the intrinsic spin of the hole J=32, with the spin of the electron and with the orbital angular momentum of the exciton envelope wave function. The only fitting parameters used were g factors for the electrons and holes. With the use of a simplified set of exciton wave functions based on a set previously published by Lipari and Altarelli, a good fit is obtained to the observed behavior of most of the lines, with ge=1.5±0.3 and gh=3.8±0.2. © 1982 The American Physical Society.

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