Absorption cross sections and number densities of electron and hole polarons in congruently melting LiNbO3
C Merschjann, B Schoke, D Conradi… - Journal of Physics …, 2008 - iopscience.iop.org
Journal of Physics: Condensed Matter, 2008•iopscience.iop.org
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 …
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 …
Abstract
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.
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