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Spin Correlations in Nonlinear Optical Response: Light-Induced Kondo Effect

2000; American Physical Society; Volume: 84; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.84.5896

1092-0145

Tigran V. Shahbazyan, I. E. Perakis, M. É. Raǐkh,

Quantum Information and Cryptography

We study the role of spin correlations in nonlinear absorption due to transitions from a deep impurity level to states above a Fermi sea. We demonstrate that the Hubbard repulsion between two electrons at the impurity leads to a logarithmic divergence in ${\ensuremath{\chi}}^{(3)}$ at the absorption threshold. This divergence is a manifestation of the Kondo physics in the nonlinear optical response of Fermi sea systems. We also show that, for off-resonant pump excitation, the pump-probe spectrum exhibits a narrow peak below the linear absorption onset. Remarkably, the light-induced Kondo temperature, which governs the shape of the Kondo-absorption spectrum, can be tuned by varying the intensity and frequency of the pump.