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Importance of exchange contributions to scattering and screening in the quantum kinetic regime

Title data

Wolterink, T. ; Axt, Vollrath M. ; Kuhn, Tilmann:
Importance of exchange contributions to scattering and screening in the quantum kinetic regime.
In: Long, A. R. ; Davies, J. H. (ed.): Physics of semiconductors 2002 : proceedings of the 26th International Conference on the Physics of Semiconductors held in Edinburgh, UK, 29 July - 2 August 2002. - Bristol : Institute of Physics , 2003 . - CD-ROM, Eintrag P84 . - (Institute of Physics Conference Series ; 171 )
ISBN 0-7503-0924-5

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Project information

Project financing: Deutsche Forschungsgemeinschaft
TMR-network Ultrafast Quantum Optoelectronics of the European Commission

Abstract in another language

We study the role of exchange contributions for the ultrafast carrier relaxation in the quantum kinetic regime. The analysis is based on a density matrix approach where besides the direct contributions to Coulomb scattering and screening in the random phase approximation (RPA) also the corresponding exchange terms are included which are necessary to satisfy the correct antisymmetry of the two-particle density matrix. At early times we find significant deviations from the commonly used RPA where these exchange contributions are neglected. At later times exchange contributions to scattering and screening tend to compensate each other and the differences between RPA and the calculations including exchange are reduced.

Further data

Item Type: Article in a book
Refereed: No
Additional notes: Condensed matter physics (theoretical)
Keywords: build-up of screening; quantum wells; electronic screening; dynamical screening; correlations; microscopic theory; semiconductors; ultrafast dynamics; random phase approximation (RPA); Coulomb quantum kinetics; two-particle density matrix; exchange; carrier relaxation
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: 18 Oct 2017 13:59
Last Modified: 19 Oct 2017 06:44
URI: https://eref.uni-bayreuth.de/id/eprint/40062