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Phys. Rev. Lett. 85, 2204–2207 (2000)

Ultrafast Optical Nonlinearity in the Quasi-One-Dimensional Mott Insulator Sr2CuO3

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T. Ogasawara1, M. Ashida2, N. Motoyama1, H. Eisaki1, S. Uchida1, Y. Tokura1, H. Ghosh3, A. Shukla2,3, S. Mazumdar3, and M. Kuwata-Gonokami1,2,*
1Department of Applied Physics, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
2Cooperative Excitation Project, ERATO, Japan Science and Technology Corporation (JST), 3-2-1 Sakato, Takatsu-ku, Kanagawa 213-0012, Japan
3Department of Physics and The Optical Sciences Center, University of Arizona, Tucson, Arizona 85721

Received 16 February 2000; published in the issue dated 4 September 2000

We report strong instantaneous photoinduced absorption in the quasi-one-dimensional Mott insulator Sr2CuO3 in the IR spectral region. The observed photoinduced absorption is to an even-parity two-photon state that occurs immediately above the absorption edge. Theoretical calculation based on a two-band extended Hubbard model explains the experimental features and indicates that the strong two-photon absorption is due to a very large dipole coupling between nearly degenerate one- and two-photon states. Room temperature picosecond recovery of the optical transparency suggests the strong potential of Sr2CuO3 for all-optical switching.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2204
DOI:
10.1103/PhysRevLett.85.2204
PACS:
78.47.+p, 42.65.Pc, 42.65.Re

*Author to whom correspondence should be addressed. Electronic address: gonokami@ap.t.u-tokyo.ac.jp

 
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