Berlin 2005 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 6: Optische Eigenschaften
HL 6.6: Vortrag
Freitag, 4. März 2005, 12:00–12:15, TU P-N229
Polariton Propagation in Semiconductor Heterostructures — •Stefan Schumacher1, Gerd Czycholl1, Frank Jahnke1, Iryna Kudyk2, Ilja Rückmann2, and Jürgen Gutowski2 — 1Institut für Theoretische Physik, Universität Bremen — 2Institut für Festkörperphysik, Universität Bremen
A microscopic theory for linear and nonlinear polariton propagation is presented. Based on the dynamics controlled truncation (DCT) formalism a χ(3)-theory for the relevant density matrix elements is introduced. The theory incorporates both, coherent optical nonlinearities and propagation effects for spatially inhomogeneous semiconductor heterostructures.
Propagation effects are investigated in a regime, where the coherent material polarization as well as the optical fields are strongly influenced by the boundaries of the system. Ambiguities due to additional boundary condition (ABCs) are avoided by a direct solution of the quantum mechanical problems for the exciton and biexciton motion within the sample boundaries together with Maxwell’s equations.
Linear and nonlinear transmission spectra in the coherent optical regime are analyzed for different excitation conditions. A direct theory-experiment comparison is given for a series of ZnSe/ZnSSe heterostructures. In contrast to the linear regime exciton-exciton Coulomb interaction turns out to strongly couple spectrally well-separated polariton states in nonlinear optics.