Evidence for light-induced hole polarons in LiNbO3 |
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| Authors: | Herth P Granzow T Schaniel D Woike Th Imlau M Krätzig E |
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| Institution: | Institut für Mineralogie, Universit?t zu K?ln, 50674 K?ln, Germany. |
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| Abstract: | Transient light-induced absorption in LiNbO3 is observed in the blue-green spectral range after pulsed illumination with 532 nm. Its buildup and decay in Fe-doped LiNbO3 is satisfactorily described by a sum of two stretched exponential functions. For undoped LiNbO3, however, only one stretched exponential decay is observed. These experimental results are explained by the formation of both small Nb(Li)4+ electron polarons and O- hole polarons. The mechanism is discussed on the basis of a proposed band scheme. |
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