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We have studied the optical and electrical spectra from an n i p LED as afunction of magnetic field. This sample incorporated three GaAs quantum wellsin the intrinsic region. This device had excess n type doping and as a result.The quantum wells were populated by a two dimension Landau electron gas. Thebroad B0 field emission band evolved into a series of discrete features in thepresence of a magnetic field. These were identified as interband transitionsbetween the different values of l. Landau levels associated with the sub-bands,with the selection rule. An energy splitting between the two polarisedcomponents was observed for each Landau level transition. This was found to beequal to the sum of the conduction and valence band spin splittings. We usedthe know value of electron g factor to determine the valence band spinsplittings. Our experimental values were compared to the numerically calculatedvalues and were found to be in reasonable agreement.

Spectrum of Landau Levels in GaAs Quantum Wells