Dimensionality dependence of optical nonlinearity and relaxation dynamics in cuprates

Details Dimensionality dependence of optical nonlinearity and relaxation dynamics in cuprates Dimensionality dependence of optical nonlinearity and relaxation dynamics in cuprates

2001-03-10

arxiv.org/abs/cond-mat/0103233v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures

Scientific paper

10.1209/epl/i2002-00660-6

Femtosecond pump-probe measurements find pronounced dimensionality dependence of the optical nonlinearity in cuprates. Although the coherent two-photon absorption (TPA) and linear absorption bands nearly overlap in both quasi-one and two-dimensional (1D and 2D) cuprates, the TPA coefficient is one order of magnitude smaller in 2D than in 1D. Furthermore, picosecond recovery of optical transparency is observed in 1D cuprates, while the recovery in 2D involves relaxation channels with a time scales of tens of picoseconds. The experimental results are interpreted within the two-band extended Hubbard model.

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