Volume 58, Number 3, May 2002
|Page(s)||455 - 461|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 August 2002|
Dimensionality dependence of optical nonlinearity and relaxation dynamics in cuprates
Cooperative Excitation Project, ERATO, Japan
Science and Technology Corporation (JST) - Kanagawa
2 Department of Applied Physics, the University of Tokyo - Tokyo 113-8656, Japan
3 Correlated Electron Research Center (CERC) and Joint Research Center for Atom Technology (JRCAT) - Tsukuba 305-8562, Japan
4 Department of Physics and the Optical Sciences Center, University of Arizona Tucson, AZ 85721, USA
Accepted: 5 February 2002
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.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 71.27.+a – Strongly correlated electron systems; heavy fermions / 42.65.An – Optical susceptibility, hyperpolarizability
© EDP Sciences, 2002
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