Internal transitions of confined neutral magnetoexcitons in quantum wells

Optically detected resonance spectroscopy has been used to study resonant absorption of electrons, holes, and their complexes in (Formula presented) quantum wells (QW’s) in magnetic fields up to 15 T. In undoped multiple-QW samples with well widths of 12.5, 15, and 20 nm, in addition to an electron and two hole cyclotron resonances, (Formula presented) (in the hydrogenic notation) internal exciton transitions (IET’s) arising from two distinct neutral heavy-hole magneto-excitons were observed. The unique capability of observing electron and hole cyclotron resonance as well as several IET’s in a single sample permitted verification of a predicted relationship resulting from the symmetry of the magnetoexciton Hamiltonian, namely, (Formula presented) where (Formula presented) is the electron (hole) cyclotron frequency, and (Formula presented) is the energy of the (Formula presented) transition.