Evidence for light-induced hole polarons in LiNbO3

Autor(en): Herth, P
Granzow, T
Schaniel, D
Woike, T
Imlau, M 
Kratzig, E
Stichwörter: CONGRUENT; DEFECTS; IRRADIATION; LITHIUM-NIOBATE CRYSTALS; OPTICAL-ABSORPTION; Physics; Physics, Multidisciplinary; RELAXATION; RESONANCE
Erscheinungsdatum: 2005
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW LETTERS
Volumen: 95
Ausgabe: 6
Zusammenfassung: 
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.
ISSN: 00319007
DOI: 10.1103/PhysRevLett.95.067404

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