{'fraction_non_alphanumeric': 0.01937046004842615, 'fraction_numerical': 0.0, 'mean_word_length': 5.17910447761194, '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}}
Search for superconductivity in an extended Hubbard model.

Extensions of the Gutzwiller variational method are used to study whether substantial nearest-neighbor repulsion between holes on a copper-oxygen lattice in two dimensions leads to simple s-wave superconductivity. It is found that the simplest one-parameter s-wave superconducting wave functions do not lower the energy with respect to the normal state.