Electron-phonon quantum kinetics for spatially inhomogeneous excitations

Titelangaben

Herbst, M. ; Glanemann, Markus ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Electron-phonon quantum kinetics for spatially inhomogeneous excitations.
In: Physical Review B. Bd. 67 (2003) Heft 19 . - 195305.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.67.195305

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Abstract

The dynamics of optically generated carriers interacting with longitudinal optical phonons in spatially inhomogeneous systems is analyzed on a quantum kinetic level. A microscopic density-matrix theory is formulated accounting for arbitrary spatial inhomogeneities in the semiconductor structure and the excitation conditions. The physical origin of the various contributions entering the dynamical equations is discussed. The theory is applied to the dynamics of a wave packet optically generated locally in a quantum wire. We study quantum kinetic features due to the interaction with phonons in the expansion process both in a one-band and a two-band model as well as the generation and dynamics of coherent phonon amplitudes.