Abstract
Non-equilibrium cyclotron resonances under hot electron conditions are studied for a two-dimensional electron gas in GaInAs/InP heterojunctions. Several novel peaks observed in the higher field are attributed to the transitions between higher-order Landau subbands. Their field splittings from the fundamental transitions are consistent with those of equilibrium resonances and the 2DEG splittings yield larger values than those in GaInAs bulk electrons. This is in contrast to the result in the GaAs/AlGaAs system. Calculations taking into account non-parabolicity and polaron pinning effect explain only a part of the splittings. If the non-parabolicity is assumed to remain constant in the heterojunction, the experimental results would then suggest enhanced polaron coupling in this system.
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