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Edge Singularity for the Optically Induced Kondo Effect in a Quantum Dot

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arxiv cond-mat/0009320 v1 pith:HZWCA2Y3 submitted 2000-09-21 cond-mat

Edge Singularity for the Optically Induced Kondo Effect in a Quantum Dot

T. Fujii , A. Furusaki , N. Kawakami , M. Sigrist This is my paper
classification cond-mat
keywords kondoeffectedgeinducedopticallyquantumspectrumabsorption
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We analyze the optically induced Kondo effect in the absorption spectrum for a quantum dot with an even number of electrons, for which the Kondo effect does not occur in the ground state. The Kondo exchange couplings generated for photo-excited states can be either antiferromagnetic or ferromagnetic, which may result in different types of the edge singularities, depending on the microscopic parameters of the dot. We discuss critical properties in the spectrum by using low-energy effective field theory.

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