{'fraction_non_alphanumeric': 0.021442495126705652, 'fraction_numerical': 0.0029239766081871343, 'mean_word_length': 5.005847953216374, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Intersubband Raman spectroscopy of two-dimensional electron gases in GaSb/InAs quantum wells

Raman scattering in GaSb/InAs quantum wells has been studied near the resonance for a series of samples where two subbands are occupied. Up to three high-frequency branches of the coupled LO phonon - intersubband plasmon modes, i.e. , and , are observed. The results are analysed using three alternative models to calculate the energies of the coupled LO phonon - intersubband plasmon modes. Calculations of the intersubband plasmon energies without the inclusion of band non-parabolicity consistently give mode energies which are 8 to 18% higher than experiment. Two theoretical methods have been developed which take into account the subband occupancies and strong band non-parabolicity. The first provides simple analytical solutions and the second is based on a detailed numerical calculation to calculate the energies of the coupled LO phonon - intersubband plasmon modes. Good agreement is achieved with the experimental data.