The effect of electron-hole hybridization on the cyclotron resonance of bipolar InAs∕GaSb structures is investigated for samples with varying electron-hole coupling. At low magnetic fields it is found that the cyclotron resonance mass of the electrons is significantly enhanced when the electrons and holes are closer together and strongly coupled. A two-band model including electron-hole mixing shows excellent agreement with the experimental results. At higher magnetic fields it is observed that the electron cyclotron resonance line is split into a series of resonances due to electron-hole Landau level hybridization. The magnetic-field positions of these splittings are proportional to the energy separation between the electrons and holes, proving the explanation that they are the result of single-particle coupling. In the quantum limit strong couplings and giant spin splitting of the cyclotron resonance transitions are seen which depend strongly on the exact structure studied.
Petchsingh, C., Nicholas, R., Takashina, K., Mason, N., & Zeman, J. (2004). Effects of electron-hole hybridization on cyclotron resonance in InAs/GaSb heterostructures. Physical Review B, 70(15), . https://doi.org/10.1103/PhysRevB.70.155306