Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption

Details Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption

2005-10-31

arxiv.org/abs/cond-mat/0510827v1

J. Phys. Soc. Jpn. 75 (2006) 023703.

Physics

Condensed Matter

Other Condensed Matter

5 pages, 5 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.75.023703

Infrared absorption spectra of SrTiO$_3$ have been measured under above-band-gap photoexcitations to study the properties of photogenerated carriers, which should play important roles in previously reported photoinduced phenomena in SrTiO$_3$. A broad absorption band appears over the entire mid-infrared region under photoexcitation. Detailed energy, temperature, and excitation power dependences of the photoinduced absorption are reported. This photo-induced absorption is attributed to the intragap excitations of the photogenerated carriers. The data show the existence of a high density of in-gap states for the photocarriers, which extends over a wide energy range starting from the conduction and valence band edges.

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