Abstract
Magnetophonon relaxation of hot electrons injected by resonant tunneling into a wide, undoped drift region is observed by measuring the magnetoresistance. Under resonant tunneling conditions, strong oscillations are observed that are attributed to emission of GaAs and AlAs-like LO phonons. Values for the effective mass of hot electrons are obtained from the resonant magnetic field positions. The effective mass is considerably larger than conduction band edge masses and agrees well with cyclotron resonance measurements at $190\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Moreover, magneto-oscillations are also observed in the valley current region. These are distinctively different from magnetophonon resonance oscillations and can be explained by inter-Landau-level-tunneling.
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