Abstract
An effective Hamiltonian for the conduction band electrons in semiconductors with arbitrary dispersion relation in both ac electromagnetic and constant magnetic fields is obtained. It is shown that the combined influence of ac electromagnetic and constant magnetic fields can qualitatively alter the properties of the dispersion relation, including its symmetry. This results in a change of the low-frequency properties of the system. A semiconductor with a quantum superlattice is used as an example of the phenomena described.
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