Cyclotron resonance at microwave frequencies is used to measure the band mass (mb) of the two-dimensional holes (2DHs) in carbon-doped (100) GaAs/ AlxGa1-xAs heterostructures. The measured mb shows strong dependences on both the 2DH density (p) and the GaAs quantum well width (W). For a fixed W, in the density range (0.4×1011 to 1.1×1011 cm-2) studied here, mb increases with p, consistently with previous studies of the 2DHs on the (311)A surface. For a fixed p = 1.1 × 1011 cm- 2, mb increases from 0.22 me at W = 10 nm to 0.50 me at W = 30 nm, and saturates around 0.51 me for W > 30 nm.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry