Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.35: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Optical characterization of polycrystalline YMnO3 films — •Daniela Täuber1, Mirko Goldmann1,2, Venkata Rao Rayapati3, Danilo Bürger3, Ilona Skorupa3, Ivan G. Scheblykin1, and Heidemarie Schmidt3 — 1Single molecule spectroscopy group, Lund University, Sweden — 2TU Ilmenau, Germany — 3Nanospintronics group, TU Chemnitz, Germany
Due to its electro-optical properties multiferroic YMnO3 is a promising candidate for a new generation of multifunctional materials. Depending on the chemical composition and underlying substrate YMnO3 thin films may exhibit orthorhombic or hexagonal crystal structure. Here we present the room-temperature spectral ellipsometry and photoluminescence data recorded on polycrystalline YMnO3 and compare the Stokes shift in dependence on chemical composition. The Stokes shift of stochiometric YMnO3 is larger than 300 meV. Smaller Stokes shifts of 130 meV, 110 meV, and 60 meV have been observed for off-stochiometric Y1Mn0.99O3 + 1.0 at%Ti, Y0.94Mn1.05O3+ 1.0 at%Ti, and Y0.95Mn1.05O3, respectively. Measured PL lifetimes are independent of chemical composition and are shorter than 200 ps.