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arXiv 1602.05623quant-ph
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自洽Dirac-麦克斯韦方程组半相对论极限下的相干自旋光诱导机制

Coherent spin-light-induced mechanisms in the semi-relativistic limit of the self-consistent Dirac-Maxwell equations

Yannick Hinschberger, G. Manfredi, P. -A. Hervieux

摘要:

我们提出了一个自洽的平均场模型的基础上的两个组件的Pauli方程,结合了量子和相对论效应(高达二阶1/c)的外部和内部的电磁场。利用Dirac-麦克斯韦方程组在有外电磁场时的半相对论极限,得到了相干光感生平均场哈密顿量的解析表达式。后者表现出几种机制,涉及所有电子和外部电磁场(激光)产生的内部平均场。阐明了光致感应电流密度和光致二阶电荷密度作为源在麦克斯韦方程组中所起的作用。特别是,我们清楚地确定了四种不同的机制,涉及自旋,可能发挥重要作用,在相干超快自旋动力学。

英文摘要:

We present a self-consistent mean-field model based on a two-component Pauli-like equation that incorporates quantum and relativistic effects (up to second-order in 1/c) for both external and internal electromagnetic fields. By taking the semi-relativistic limit of the Dirac-Maxwell equations in the presence of an external electromagnetic field we obtain an analytical expression of a coherent light-induced mean-field Hamiltonian. The latter exhibits several mechanisms that involve the internal mean fields created by all the electrons and the external electromagnetic field (laser). The role played by the light-induced current density and the light-induced second-order charge density acting as sources in Maxwell's equations are clarified. In particular, we identify clearly four different mechanisms involving the spins that may play an important role in coherent ultrafast spin dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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