Abstract

The transition from closed to open electron orbits in a magnetic field has been studied by polarized hot electron photoluminescence (HEPL) in superlattices with varied widths of electron minibands. The dependence of the HEPL depolarization on the miniband width is observed. The strong depolarization occurring when the kinetic energy of electrons exceeds the energy gap between the minibands is interpreted in terms of a magnetic-field-induced transition between the electron minibands (magnetic breakdown).

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