Atomic insight to lattice distortions caused by carrier self-trapping in oxide materials

Felix Freytag, G. Corradi, Mirco Imlau

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We gain hitherto missing access to the spatio-temporal evolution of lattice distortions caused by carrier self-trapping in the class of oxide materials - and beyond. The joint experimental/theoretical tool introduced combines femtosecond mid-infrared probe spectroscopy with potential landscape modeling and is based on the original approach that the vibration mode of a biatomic molecule is capable to probe strongly localized, short-lived lattice distortions in its neighborhood. Optically generated, small, strong-coupling polarons in lithium niobate, mediated by OH - ions present as ubiquitous impurities, serve as a prominent example. Polaron trapping is found to result in an experimentally determined redshift of the OH- stretching mode amounting to Δv = -3 cm -1, that is successfully modeled by a static Morse potential modified by Coulomb potential changes due to the displacements of the surrounding ions and the trapped charge carrier. The evolution of the trapping process can also be highlighted by monitoring the dynamics of the vibrational shift making the method an important tool for studying various systems and applications.

Original languageEnglish
Article number36929
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - Nov 14 2016

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trapping
oxides
Morse potential
probes
polarons
Coulomb potential
lithium niobates
charge carriers
vibration mode
ions
impurities
shift
spectroscopy
molecules

ASJC Scopus subject areas

  • General

Cite this

Atomic insight to lattice distortions caused by carrier self-trapping in oxide materials. / Freytag, Felix; Corradi, G.; Imlau, Mirco.

In: Scientific Reports, Vol. 6, 36929, 14.11.2016.

Research output: Contribution to journalArticle

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