Relaxation of electronic excitations in wide-gap crystals studied by femtosecond interferometry technique
- 49 Downloads
Time-resolved interferometry with a 100-fs temporal resolution was applied for the first time to studying the relaxation of electronic excitations in complex oxides, namely, tungstates CDWO4 with a crystal lattice of the wolframite-type and CaWO4 with a scheelite-type lattice. Two stages of charge carrier relaxation, namely, very fast carrier trapping in 200 fs resulting in self-trapped exciton formation and a relatively slow picosecond relaxation process probably due to configurational relaxation within the oxyanion molecule and modification of the surrounding lattice, are revealed in tungstate crystals. Corresponding models of self-trapped exciton creation in tungstate crystals are discussed.
PACS numbers72.20.Jv 78.47.+p
Unable to display preview. Download preview PDF.
- 8.A. N. Vasil’ev, in Proceedings of the 5th International Conference on Inorganic Scintillators and Their Applications, Moscow, Russia, 1999, Ed. by V. V. Mikhailin (Moscow State University, Moscow, 2000), p. 43.Google Scholar
- 9.V. V. Hizhnyakov and N. N. Kristoffel, in The Dynamical Jahn-Teller Effect in Localized Systems, Ed. by Yu. E. Perlin and M. Wagner (Elsevier Sci., Amsterdam, 1984).Google Scholar
- 10.J. Becker, A. N. Belsky, D. Bouttet, C. Dujardin, A. V. Gektin, A. Hopkirk, S. N. Ivanov, I. A. Kamenskikh, N. Y. Kirikova, V. Klimenko, V. N. Kolobanov, V. N. Makhov, P. Martin, V. V. Mikhailin, I. H. Munro, C. Mythen, P. A. Orekhanov, C. Pedrini, A. Schröder, D. A. Shaw, N. Shiran, I. N. Shpinkov, A. N. Vasil’ev, and G. Zimmerer, in Proceedings of the International Conference on Inorganic Scintillators and Their Applications (SCINT95), Delft, The Netherlands, 1995, Ed. by P. Dorenbos and C. W. E. van Eijk (Delft University Press, Delft, The Netherlands, 1996), p. 118.Google Scholar
- 11.Ph. Daguzan, P. Martin, S. Guizard, and G. Petite, Phys. Rev. B: Condens. Matter 52, 17 099 (1995).Google Scholar