Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 50: Poster II

HL 50.69: Poster

Donnerstag, 30. März 2006, 16:30–19:00, P3

Resonant Raman scattering in Cu₂O — •Jan Brandt¹, Dietmar Fröhlich¹, Christian Sandfort¹, Manfred Bayer¹, and Heinrich Stolz² — ¹Institut für Physik, Universität Dortmund, D-44221 Dortmund, — ²Fachbereich Physik, Universität Rostock, D-18051 Rostock

We present results on exciton phonon polariton scattering in Cu₂O. We study by high resolution spectroscopy (ΔE<10neV) resonant Raman scattering on the yellow 1S orthoexciton for optical phonons of different symmetry (Γ₃⁻, Γ₄⁻, Γ₅⁻). The Γ₄⁻ phonon of 19meV is optically active and has thus to be considered as a polariton with TO and LO components split by 0.3meV. For forward Raman scattering the polariton character of the TO components has to be taken into account. We present the Raman selection rules for quadrupole excitation of the threefold Γ₅⁺ exciton. The splitting in up to three components by k-dependent exchange interaction is also taken into account¹.

[1] Dasbach et al. PRB 70, 045206 (2004)