Absorption cross sections and number densities of electron and hole polarons in congruently melting LiNbO(3)

The number densities and absorption cross sections of both optically generated and reduction-induced small electron and hole polarons in LiNbO(3) are determined by means of time-resolved pump-multiprobe spectroscopy. The data are obtained for free (Nb(Nb)(4+)) and bound (Nb(Li)(4+)) electron polaron...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2009-01, Vol.21 (1), p.015906-015906
Main Authors: Merschjann, C, Schoke, B, Conradi, D, Imlau, M, Corradi, G, Polgár, K
Format: Article
Language:English
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Summary:The number densities and absorption cross sections of both optically generated and reduction-induced small electron and hole polarons in LiNbO(3) are determined by means of time-resolved pump-multiprobe spectroscopy. The data are obtained for free (Nb(Nb)(4+)) and bound (Nb(Li)(4+)) electron polarons, bound Nb(Li)(4+):Nb(Nb)(4+) electron bipolarons, and bound O(-) hole polarons. The peak absorption cross sections are in the range of σ(pol)≈(4-14) × 10(-22) m(2), comparable to that for Fe(2+). In all cases the ratio of occupied to unoccupied polaronic sites is less than 10(-2).
ISSN:0953-8984
DOI:10.1088/0953-8984/21/1/015906