Evidence for two-path recombination of photoinduced small polarons in reduced LiNbO3

Autor(en): Merschjann, C.
Berben, D.
Imlau, M. 
Woehlecke, M.
Stichwörter: DEFECTS; INDUCED INFRARED-ABSORPTION; Physics; Physics, Multidisciplinary; RESONANCE; TRANSPORT
Erscheinungsdatum: 2006
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW LETTERS
Volumen: 96
Ausgabe: 18
Zusammenfassung: 
The recombination of photoinduced free Nb-Nb(4+) and bound Nb-Li(4+) small polarons to NbLi4+NbNb4+ bipolarons is investigated in nominally pure, reduced LiNbO3 single crystals by means of excited-state-absorption spectroscopy. We discovered a two-component decay of the light-induced absorption alpha(li)(t) for probe light at lambda=785 nm and moderate pump beam intensities (I-p << 670 GW/m(2)). These experimental results give strong evidence for the existence of a two-path recombination of the photoinduced polarons. A corresponding model taking into account hopping charge transport and trapping is presented.
ISSN: 00319007
DOI: 10.1103/PhysRevLett.96.186404

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