Münster 1999 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 23: Poster II
HL 23.39: Poster
Mittwoch, 24. März 1999, 14:00–18:00, Z
Electro-Optical Properties of Excitons in Quantum Wires — •G. Czajkowski3, M. Dressler1, and F. Bassani2 — 1ETH Zürich, Department of Materials, and Institute of Polymers, CH-8092 Zürich (Switzerland) — 2Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa (Italy), and Istituto Nazionale di Fisica della Materia — 3University of Technology and Agriculture, S. Kaliskiego 7, PL-85796 Bydgoszcz (Poland)
We show how to compute the optical functions (reflectivity, transmission, and absorption) of a matrix containing Quantum Wires (QWWs) exposed to a uniform electric field in the wire axis direction, in the excitonic energy region. Adopting a model electron-hole potential, we derived an analytical expression for the effective QWW susceptibility, which gives the optical functions. The resulting absorption shows excitonic peaks below the gap and Franz-Keldysh oscillations above the gap. The method has been applied for 3BCMU and 4BCMU polydiacetylene chains (treated as QWWs), showing a good agreement with experimental spectra.