Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session
DF 9.3: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Hopping transport of small strong-coupling polarons in magnesium doped lithium niobate — •Tobias Noerenberg1,2, Lukas M. Eng1, Simon Messerschmidt2, Andreas Krampf2, and Mirco Imlau2 — 1Institut für Angewandte Physik, Technische Universität Dresden, Germany — 2School of Physics, Osnabrück University, Germany
Lithium niobate is an important, widely used ferroelectric in optics and photonics. Its nonlinear optical properties and electrical conductivity are largely influenced by small strong-coupling polarons [M. Imlau et al. Appl. Phys. Rev. 2, 040606 (2015)]. Their microscopic movement is usually investigated in the high-temperature regime and therefore described by a thermally activated hopping transport.
For the first time we were able to measure the polaron transport for magnesium doped lithium niobate (above and below the optical damage resistance threshold) via light-induced absorption in a temperature regime where the thermal energy does not suffice to provide the hopping’s activation energy, i.e. as low as 40 K.
The results will be qualitatively compared to Emin’s hopping theory [Emin. Polarons. Cambridge (2013)] who predicted three different temperature dependent hopping processes: the well-known Arrhenius behaviour at high temperatures, the multiphonon freezeout and at low temperatures the atomic tunneling regime.
Financial support by the DFG (project numbers: IM 37/5-2, INST 190/137-1 FUGG, INST 190/165-1) is gratefully acknowledged.