Abstract
Cyclotron resonance of high-mobility (up to 300000 cm2 V-1 s-1 at 100 mK) GaAs/AlGaAs two-dimensional hole gases (2DHGs) grown on (311)A oriented substrates has been measured in magnetic fields up to 17 T and at temperatures down to 350 mK. The 2D hole density is in the range (1.0-2.0)*1011 cm-2. Two resonances are in general observed; at low magnetic fields the lower-field resonance dominates but a progressive transfer of oscillator strength takes place as the field increases. A self-consistent calculation of the Landau fan diagram for the higher-symmetry (100) direction is used to interpret the data and identify the observed transitions.
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