Ultrafast optical nonlinearity in quasi - one - dimensional Mott - insulator Sr 2 CuO 3
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چکیده
We report strong instantaneous photoinduced absorption in the quasi-one-dimensional Mott insulator Sr 2 CuO 3 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 Sr 2 CuO 3 for all-optical switching.
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تاریخ انتشار 2000