{'fraction_non_alphanumeric': 0.018226002430133656, 'fraction_numerical': 0.002430133657351154, 'mean_word_length': 5.5396825396825395, '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}}
Nonstationary quasiperiodic energy distribution of an electron gas upon ultrafast thermal excitation.

We consider the evolution of an electronic system initially in equilibrium with a semiconductor crystal lattice upon a sudden rise in the lattice temperature. On a short time scale (∼1 ps), electrons equilibrate with the optical phonons and establish a peculiar quasiperiodic energy distribution. Time evolution toward this distribution is discussed on the basis of an exact solution of the Boltzmann transport equation. While the quasiequilibrium regime persists (longer than ∼1 ns), the electronic system possesses a number of unusual thermodynamic and transport properties. The specific heat is suppressed as if some of the electron degrees of freedom were frozen out; the low-field mobility is substantially enhanced