Energy Structure and Quantized Hall Effect of Two-Dimensional Holes

Abstract

Combined magnetotransport and cyclotron-resonance experiments in a two-dimensional hole system at a modulation-doped GaAs-(AlGa)As heterojunction show that the Kramers degeneracy of the lowest subband is lifted for finite $k$ giving rise to two cyclotron masses ${{m}_{1}}^{*}=0.38{m}_{0}$ and ${{m}_{2}}^{*}=0.60{m}_{0}$ at ${E}_{\mathrm{F}}=2.4$ meV. The observation of plateaus in ${\ensuremath{\rho}}_{xy}$ shows that the quantized Hall effect is independent of the details of the host band structure.