Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 6: Optische Eigenschaften

HL 6.8: Vortrag

Freitag, 4. März 2005, 12:30–12:45, TU P-N229

Nonperturbative Theory of Exciton-Phonon Resonances in Semiconductor Absorption — •Karsten Hannewald and Peter Bobbert — Group Polymer Physics, Eindhoven Polymer Laboratories, Technische Universiteit Eindhoven, The Netherlands

We present a novel theory of exciton-phonon resonances, a commonly observed feature in near-band-gap semiconductor spectroscopy. Our results generalize the textbook absorption formula for a coupled atom/molecule-phonon system [1] to the case of semiconductors. The strength of our approach is the simultaneous inclusion of the dispersive single-particle band structures and charge-carrier Coulomb interactions while, at the same time, treating the electron-phonon interaction nonperturbatively [2]. Numerical studies for a simplified model crystal provide a proof-of-principle for the practical usefulness of our approach.

[1] G.D. Mahan, Many Particle Physics, (Plenum Press, London, 1990).

[2] K. Hannewald and P.A. Bobbert, submitted to Phys. Rev. Lett.