Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session
DF 9.6: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Global modelling of strong-coupling carriers in lithium niobate — Simon Messerschmidt1, Andreas Krampf1, •Tobias Nörenberg1, Felix Freytag1, Mirco Imlau1, Laura Vittadello2, and Marco Bazzan2 — 1School of Physics, Osnabrueck University, Barbarastraße 7, 49076 Osnabrueck, Germany — 2Dipartimento di Fisica e Astronomia, Università di Padova, Via Marzolo 8, 35131 Padova, Italy
Strong-coupling carriers, such as small polarons and/or self-trapped excitons (STE), are of increasing importance for a variety of dielectric applications. Although, the properties of these quasiparticles have been studied individually over decades in a variety of oxide dielectrics, a comprehensive model for the excitation, transport and transformation between different types of strong-coupling carriers and the mutual interplay is missing. We have addressed this question by considering small, strong-coupling polarons together with self-trapped excitons in the model system lithium niobate, LiNbO3 (LN) [Imlau, M. et al. Appl. Phys. Rev. 2 (2015)]. Our studies comprise different measurement techniques and experimental conditions, i.e., transient absorption and luminescence analysis in a temperature range from (15-300) K, involving nominally undoped, Fe-, and Mg-doped LN samples. We succeeded in global modelling of all data using a single set of parameters by considering the various types of strong-coupling carriers and show the importance of a blue-green absorption of STEs, so far not been considered in literature. Financial support by the DFG (IM 37/5-2, INST 190/165-1 FUGG) is gratefully acknowledged.