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arXiv 2207.00331cond-mat.mes-hall
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非线性光学响应理论

Theory of nonlinear optical response

Amin Maleki Sheikhabadi, Zahra Bagheri, Ali Sadeghi

摘要:

我们提出了一个一般的形式主义调查的二阶光学响应的固体电场在弱无序晶体任意复杂的能带结构的基础上密度矩阵方程的运动,玻恩近似处理的障碍,并在扩展的散射率领先的非平凡秩序。我们的工作的主要目的之一是使广泛的传输理论的应用,充分考虑电场诱导的带间和带内相干性之间的相互作用,和布洛赫态散射。准粒子带被处理在一个完全一般的方式,允许任意形式的内禀自旋轨道耦合(SOC),并可以扩展到非本征SOC。根据以前的结果,在无序势的存在下,带间响应的导体除了本征贡献,由于整个费米海捕获,除其他外,Berry曲率对波包动力学的贡献包括由对费米面的存在敏感的散射引起的异常贡献。为了证明我们的理论所捕获的丰富的物理,考虑了不同强度阶的弛豫时间矩阵,同时我们明确地解决了简单无序Rashba模型的一些电场响应特性,这些特性已知由带间相干贡献主导。我们提出的表达式是服从数值计算,我们证明了这一点,通过执行一个完整的带间贡献的能带结构计算,即使在金属。

英文摘要:

We present a general formalism for investigating the second-order optical response of solids to an electric field in weakly disordered crystals with arbitrarily complicated band structures based on density-matrix equations of motion, on a Born approximation treatment of disorder, and on an expansion in scattering rate to leading non-trivial order. One of the principal aims of our work is to enable extensive transport theory applications that accounts fully for the interplay between electric-field-induced interband and intraband coherence, and Bloch-state scattering. The quasiparticle bands are treated in a completely general manner that allows for arbitrary forms of the intrinsic spin-orbit coupling (SOC) and could be extended to the extrinsic SOC. According to the previous results, in the presence of the disorder potential, the interband response in conductors in addition to an intrinsic contribution due to the entire Fermi sea that captures, among other effects, the Berry curvature contribution to wave-packet dynamics includes an anomalous contribution caused by scattering that is sensitive to the presence of the Fermi surface. To demonstrate the rich physics captured by our theory, the relaxation time matrix for different strength order is considered and at the same time we explicitly solve for some electric-field response properties of simple disordered Rashba model that are known to be dominated by interband coherence contributions. The expressions we present are amenable for numerical calculations, and we demonstrate this by performing a full band-structure calculation of the interband contribution, even in metals.

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