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Regensburg 2016 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 3: Optical and nonlinear optical properties, photonic

DF 3.4: Talk

Monday, March 7, 2016, 10:30–10:50, H26

OH as local, vibrational probe for the inspection ofsmall, strong-coupling polarons — •Felix Freytag, Phillip Booker, and Mirco Imlau — School of Physics, Osnabrueck University,Barbarastr. 7, 49076 Osnabrueck, Germany

A small polaron is defined by the unit of a self-trapped carrier and the associated displacement of atomic equilibrium positions confined to a single lattice site [Emin, Polarons, Cambridge University Press (2013)]. There’s an increasing attention to the structural distortion parameters of small polarons for nonlinear optical processes in polar oxides on the ultrafast time-scale [Imlau et al., Applied Physics Reviews 2, 40606 (2015)]. Even though, a multitude of knowledge has been gathered and a variety of experimental techniques like EPR/NMR measurements were applied, there is still no possibility for direct experimental access to the structural aspects of small polarons within a continuum and at elevated temperatures. Here, we propose a vibrational method to experimentally achieve local information about small polarons at room temperature. The absorption change of the OH stretching vibration is applied as local probe for optically excited small polarons with lithium niobate as an example; detected by time-resolved mid-infrared pump-probe spectroscopy. The change is explained straightforwardly by a local change of the lattice environment induced by small polaron formation. By analysis of the vibrational potential of the OH-stretching bond, we are able to estimate the polaron induced lattice distortion. Financial support by the DFG (IM 37/5-2, INST 190/165-1 FUGG) is gratefully acknowledged.

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