Far-infrared magnetospectroscopy on InAs/AlₓGa_1-xSb quantum-well structures has revealed new transitions (X lines) when sufficient holes (in AlₓGa_1-xSb) coexist with electrons (in InAs) and the magnetic field is high enough. The electron-related X line is about 3 meV above electron cyclotron resonance, has roughly the same slope vs magnetic field, and increases in intensity with increasing hole density or decreasing temperature. This line is assigned to an internal excitonic transition and provides evidence for the existence of an excitonic ground state.
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Cheng et al. (1995) studied this question.
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