Abstract
Microwave cyclotron resonance of low-density high-mobility two-dimensional hole gases of different densities in (100) oriented GaAs∕AlGaAs heterostructures has been measured at 4.2K. The measurements show that the hole effective mass depends strongly on the confining potential. For holes in a 20nm quantum well, the cyclotron mass decreases from 0.48me at density p=6.9×1010∕cm2 to 0.29me at p=0.8×1010∕cm2. The cyclotron mass for holes confined at a heterojunction is fairly insensitive to the density and has a value of approximately 0.5me.
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