Cyclotron Resonance of Itinerant Holes in Ferromagnetic InMnAs/GaSb   Heterostructures
  We report the first observation of hole cyclotron resonance (CR) in ferromagnetic InMnAs/GaSb heterostructures both in the high-temperature paramagnetic phase and the low-temperature ferromagnetic phase. We clearly resolve two resonances that exhibit strong temperature dependence in position, linewidth, and intensity. We attribute the two resonances to the so-called fundamental CR transitions expected for delocalized holes in the valence band in the magnetic quantum limit, demonstrating the existence of $p$-like itinerant holes that are describable within the Luttinger-Kohn effective mass theory. 
G.A. Khodaparast, J. Kono, Y.H. Matsuda, T. Ikaida, S. Ikeda, N.   Miura, T. Slupinski, A. Oiwa, H. Munekata