Observation of Magnetophonon Resonances in a Two-Dimensional Electronic System

Abstract

We report the first observation of magnetophonon resonances in the two-dimensional electronic system in single interface GaAs-${\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ heterojunctions and heterojunction superlattices. They result from inelastic scattering between Landau levels with resonant absorption of LO phonons of GaAs and yield a polaron mass ${{m}_{p}}^{*}=(0.077\ifmmode\pm\else\textpm\fi{}0.004){m}_{e}$.