Electron-phonon quantum kinetics beyond the second-order Born approximation

Titelangaben

Lohmeyer, Henning ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Electron-phonon quantum kinetics beyond the second-order Born approximation.
In: Menéndez, José ; van de Walle, Chris G. (Hrsg.): Physics of Semiconductors : 27th International Conference on the Physics of Semiconductors (ICPS-27), Flagstaff, Arizona, 26 -30 July 2004. Vol. 2. - Melville, New York : American Institute of Physics (AIP) , 2005 . - S. 907-908 . - (AIP Conference Proceedings ; 772 )
ISBN 0-7354-0257-4
DOI: https://doi.org/10.1063/1.1994401

Angaben zu Projekten

Abstract

For a one‐band model of a quantum wire coupled to LO‐phonons we present results for the dynamics of the coupled electron‐phonon system calculated with quantum kinetic equations obtained in the density matrix approach. Using a correlation expansion for the truncation of the infinite hierarchy of equations of motion we go beyond the usual second‐order Born approximation by taking into account two‐particle correlations and twofold phonon‐assisted density matrices. The different approximation levels are compared among each other and with an exact solution for a simplified case.