Influence of chemical reduction on the particular number densities of light-induced small electron and hole polarons in nominally pure LiNbO3

DC FieldValueLanguage
dc.contributor.authorMerschjann, C.
dc.contributor.authorSchoke, B.
dc.contributor.authorImlau, M.
dc.date.accessioned2021-12-23T16:03:52Z-
dc.date.available2021-12-23T16:03:52Z-
dc.date.issued2007
dc.identifier.issn24699950
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/6246-
dc.description.abstractThe influence of chemical reduction on the particular number densities of light-induced free small Nb-Nb(4+) electron polarons, bound small Nb-Li(4+) electron polarons, bound small Nb-Li(4+):Nb-Nb(4+) electron bipolarons, and bound small O- hole polarons is investigated in nominally pure, congruently melting LiNbO3 by means of excited-state absorption spectroscopy. Characteristic changes in the sign of the light-induced absorption in the blue-green spectral range and distinctive dependencies on the pump beam intensity reflect the increasing contribution of electron polarons generated upon single intense ns-laser pulses at lambda=532 nm with increasing degree of reduction. The entire data set including its time dependence and spectral properties is consistently explained within a model taking into account the presence of all four types of electron and hole polarons, and residual Fe2+/3+ impurities. The model includes one- and two-photon excitation processes for polaron generation, optical gating of bipolarons, and direct and two-step polaronic recombination processes. Our results indicate a mutual independence of two-photon hole polaron generation and one-photon dissociation processes of bipolarons, at least for moderate degrees of reduction.
dc.language.isoen
dc.publisherAMER PHYSICAL SOC
dc.relation.ispartofPHYSICAL REVIEW B
dc.subjectCENTERS
dc.subjectDEFECTS
dc.subjectINDUCED INFRARED-ABSORPTION
dc.subjectLIB3O5
dc.subjectLITHIUM TRIBORATE
dc.subjectMaterials Science
dc.subjectMaterials Science, Multidisciplinary
dc.subjectMOTION
dc.subjectPARAMAGNETIC-RESONANCE
dc.subjectPhysics
dc.subjectPhysics, Applied
dc.subjectPhysics, Condensed Matter
dc.subjectTIME
dc.titleInfluence of chemical reduction on the particular number densities of light-induced small electron and hole polarons in nominally pure LiNbO3
dc.typejournal article
dc.identifier.doi10.1103/PhysRevB.76.085114
dc.identifier.isiISI:000249155400026
dc.description.volume76
dc.description.issue8
dc.contributor.orcid0000-0002-9557-1601
dc.contributor.researcheridC-9338-2012
dc.identifier.eissn24699969
dc.publisher.placeONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
dcterms.isPartOf.abbreviationPhys. Rev. B
crisitem.author.deptFB 04 - Physik-
crisitem.author.deptidfb04-
crisitem.author.orcid0000-0002-5343-5636-
crisitem.author.parentorgUniversität Osnabrück-
crisitem.author.netidImMi360-
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