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Temporally and Spatially Resolved Electron–Phonon Quantum Kinetics

Title data

Herbst, M. ; Axt, Vollrath M. ; Kuhn, Tilmann:
Temporally and Spatially Resolved Electron–Phonon Quantum Kinetics.
In: Physica Status Solidi B. Vol. 221 (September 2000) Issue 1 . - pp. 419-424.
ISSN 0370-1972
DOI: https://doi.org/10.1002/1521-3951(200009)221:1<419::AID-PSSB419>3.0.CO;2-I

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

A quantum kinetic theory that is able to resolve interaction processes between carriers and phonons in time and in space is presented. The dynamics of spatially localized wave-packets is analyzed accounting for coherent as well as incoherent phonons. It is found that, as a consequence of the energy–time uncertainty, a fast initial carrier transport takes place leading to occupations of space regions which are out of reach at early times within a semiclassical description on the level of the Boltzmann equation. The charge separation that accompanies the transport of electrons is a source of coherent phonons. The corresponding polarizations of the ion-lattice show oscillations that form a spatially expanding wavefront. Adding incoherent phonons leads to a damping of these waves due to phonon-assisted carrier redistributions.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Condensed matter physics (theoretical)
Keywords: phonons; quantum kinetics; Semiconductors; laser excitation; ultrafast dynamics; non-linear optics; enery-time uncertainty
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 17 Oct 2017 14:00
Last Modified: 18 Oct 2017 07:30
URI: https://eref.uni-bayreuth.de/id/eprint/40047