首页> 外文会议>Conference on Ultrafast Phenomena in Semiconductors Ⅴ Jan 25-26, 2001, San Jose, USA >Spin dynamics in nonlinear optical spectroscopy of Fermi sea systems
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Spin dynamics in nonlinear optical spectroscopy of Fermi sea systems

机译:费米海系统非线性光谱的自旋动力学

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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.
机译:我们讨论了多体自旋相关性在具有深杂质水平的费米海系统的非线性光学响应中的作用。由于杂质之间电子之间的哈伯排斥力,杂质能级和费米海态之间的光学跃迁导致了光诱导的近藤效应。特别地,三阶非线性光学磁化率在吸收阈值处对数地发散。泵浦探针光谱的形状受光诱导的近藤温度控制,可以通过改变泵浦光场的强度和频率来对其进行调整。在近藤极限中,对应于非共振泵激激励,非线性吸收光谱在线性吸收起始点以下显示一个窄峰。

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