Kinetics of nonequilibrium electron-phonon system for semiconductors and metals in a strong electric field

• Main Authors: Karas, V.I., Potapenko, I.F., Vlasenko, A.M.
• Format: Article
• Language: English
• Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2013
• Series: Вопросы атомной науки и техники
• Subjects: Нелинейные процессы в плазменных средах
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/112158

Formation of non-stationary nonequilibrium distribution functions (DF) of electrons and phonons is investigated under the action of a strong pulse electric field on metal. For concreteness parameters were taken for nickel having reference temperature of 20 K. It is shown: isotropization of electron DF occurs as a result of impacts with lattice imperfections; •electron DF does not become thermodynamically equilibrium as electron-electron impacts in the given situation give essentially smaller contribution than electron-phonon collisions and collisions with a "another's" subsystem do not result to thermalization; •DF of electrons and phonons have high energy "tails" as in electronphonon impacts the momentum is transferred with sufficiently small transfer of energy; a lot of phonons with Debye energy are being born, i.e. phonon DF is being enriched by Debye phonons.