{'fraction_non_alphanumeric': 0.02386634844868735, 'fraction_numerical': 0.007159904534606206, 'mean_word_length': 5.2611940298507465, '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}}
Photo-induced polarization rotation in semimagnetic semiconductor quantum wells

Giant photo-induced Faraday rotations were observed in CdTe-CdMnTe multiple quantum wells when the laser frequency is close to the excitonic resonance, which is enhanced through the quantum confinement. Moreover, we recently demonstrated that large photo-induced polarization rotations (-7 degrees) could be obtained even in the absence of an external magnetic field when using circularly polarized pump pulses. In this paper we present a spectrally and temporally resolved analysis of this phenomenon and show that it results from the combined effect of photo-induced magnetization, many body interactions, and spectral hole burning. The sample contained ten 47 /spl Aring/ thick CdTe wells with 950 /spl Aring/ thick CdMnTe barriers on a CdZrTe substrate.