Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 9: Poster I
HL 9.62: Poster
Montag, 27. März 2006, 15:15–17:45, P3
Spectral function of externally confined electrons in a strong time-dependent field — •Andrea Fromm1, Michael Bonitz1, and James Dufty2 — 1Institut für Theoretische Physik und Astrophysik, Universität Kiel, Leibnizstr. 15, 24098 Kiel — 2Physics Department, University of Florida, Gainesville
Charged particles which are spatially confined in traps or quantum dots are of growing interest in many fields, including semiconductor transport, clusters or ultracold ions. Of special relevance is the particle response to strong AC electromagnetic fields where interesting collective effects (plasmons) and nonlinear phenomena such as high-harmonics generation and multi-photon absorption are expected. A self-consistent gauge-invariant nonequilibrium Green’s functions treatment of these phenomena has been developed recently [1,2] for spatially homogeneous systems and was extended to weakly inhomogeneous spatially confined systems [3]. Here we extend this approach to a detailed analysis of the electron spectral function which selfconsistently includes strong fields and confinement effects and present results for the effective quantum potential for various external fields.
[1] D. Kremp, Th. Bornath, M. Bonitz, and M. Schlanges, Phys. Rev. E 60, 4725 (1999). [2] M. Bonitz, Th. Bornath, D. Kremp, M. Schlanges, and W.D. Kraeft, Contrib. Plasma Phys. 39, 329 (1999). [3] M. Bonitz, and J.W. Dufty, Cond. Matt. Phys. 7, 483 (2004)