Spin dynamics in nonlinear optical spectroscopy of Fermi sea systems

Details Spin dynamics in nonlinear optical spectroscopy of Fermi sea systems Spin dynamics in nonlinear optical spectroscopy of Fermi sea systems

2000-12-09

arxiv.org/abs/cond-mat/0012153v1

Physics

Condensed Matter

7 pages inluding 2 figures. Invited paper for SPIE's Optoelectronics 2001 Conference

Scientific paper

We discuss the role of many-body spin correlations in nonlinear optical response of a Fermi sea system with a deep impurity level. Due to the Hubbard repulsion between electrons at the impurity, the optical transitions between the impurity level and the Fermi sea states lead to an optically-induced Kondo effect. In particular, the third-order nonlinear optical susceptibility logarithmiclly diverges at the absorption threshold. The shape of the pump-probe spectrum is governed by the light-induced Kondo temperature, which can be tuned by varying the intensity and frequency of the pump optical field. In the Kondo limit, corresponding to off-resonant pump excitation, the nonlinear absorption spectrum exhibits a narrow peak below the linear absorption onset.

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