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arXiv 2203.01029cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-sci
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莫特绝缘体中高次谐波产生的反常温度依赖性

Anomalous temperature dependence of high-harmonic generation in Mott insulators

Yuta Murakami, Kento Uchida, Akihisa Koga, Koichiro Tanaka, Philipp Werner

摘要:

我们揭示了强自旋-电荷耦合对莫特绝缘体中高次谐波产生的重要影响。在具有反铁磁关联的系统中,HHG信号随着温度的降低而急剧增强,即使间隙增加并且载流子的产生被抑制。这种反常的行为,这也被观察到在最近的高次谐波实验上的Ca $_2$ RuO $_4$,起源于自旋-电荷耦合和热系综之间的协同效应,和强烈的温度依赖的相干性之间的载流子。我们认为高次谐波的温度依赖性是莫特绝缘体的一个普遍特征,它可以通过库仑相互作用和系统的维数来控制。我们的研究结果表明,不同的自由度之间的相关性,这是一个特征的强相关固体,非线性光学响应有显着的和非平凡的影响。

英文摘要:

We reveal the crucial effect of strong spin-charge coupling on high-harmonic generation (HHG) in Mott insulators. In a system with antiferromagnetic correlations, the HHG signal is drastically enhanced with decreasing temperature, even though the gap increases and the production of charge carriers is suppressed. This anomalous behavior, which has also been observed in recent HHG experiments on Ca$_2$RuO$_4$, originates from a cooperative effect between the spin-charge coupling and the thermal ensemble, and the strongly temperature-dependent coherence between charge carriers. We argue that the peculiar temperature dependence of HHG is a generic feature of Mott insulators, which can be controlled via the Coulomb interaction and dimensionality of the system. Our results demonstrate that correlations between different degrees of freedom, which are a characteristic feature of strongly correlated solids, have significant and nontrivial effects on nonlinear optical responses.

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