In quantum-mechanical terms, the cyclotron and electron-spin resonances originate from optical transitions of carriers between the Landau levels and magneticfield-splitted spin sublevels. Measurement of the dependence of the cyclotronresonance frequency on the magnitude and direction of magnetic field provides a direct and reliable way for determining the electron (or hole) effective mass, as well as for studying the nonparabolicity and nonsphericity of an electronic band in a semiconductor. In connection with this, we derive in Sec. 7.1 expressions for the longitudinal and transverse electron mass in a superlattice at the miniband bottom, analyze how the choice of the boundary conditions for the envelopes at the interfaces affects these masses, and discuss the nonparabolicity of the miniband spectrum.
KeywordsAnisotropy GaAs Refraction
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