{'fraction_non_alphanumeric': 0.006607929515418502, 'fraction_numerical': 0.0, 'mean_word_length': 5.408450704225352, '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}}
Plasmon Spectra in Metallic Superlattices

We present results of a hydrodynamic study of the plasmon spectra in metallic superlattices by treating the different layers as jelliums. Interesting changes in the plasmon dispersions and relative growth and decline of the bulk and interface modes with modulation wavelength and transversal wave vector are noted. A variation of the electronic effective mass with the modulation wavelength has also been found.