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arXiv 2103.13708cond-mat.str-elphysics.comp-ph
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二维莫特绝缘体中的高次谐波

High Harmonic Generation in Two-Dimensional Mott Insulators

Christopher Orthodoxou, Amelle Zaïr, George H. Booth

摘要:

结合量子蒙特卡罗、精确对角化和简化的动力学平均场模型等数值方法,研究了强激光脉冲作用下二维莫特绝缘体中电子的阿秒电荷动力学.在这些强相关系统中超越单粒子方法的必要性使得二维扩展材料的模拟具有挑战性,我们将其产生的高次谐波发射与更广泛研究的一维类似物进行了对比。除了考虑Mott绝缘态和磁序的光致击穿外,我们还解析了发射的时域和超高频域,这两个域用于表征光跃迁和电子动力学的子周期结构。这扩展了模拟能力和理解这些莫特绝缘体的光熔化的二维,在阿秒非平衡科学的前沿相关材料。

英文摘要:

With a combination of numerical methods, including quantum Monte Carlo, exact diagonalization, and a simplified dynamical mean-field model, we consider the attosecond charge dynamics of electrons induced by strong-field laser pulses in two-dimensional Mott insulators. The necessity to go beyond single-particle approaches in these strongly correlated systems has made the simulation of two-dimensional extended materials challenging, and we contrast their resulting high-harmonic emission with more widely studied one-dimensional analogues. As well as considering the photo-induced breakdown of the Mott insulating state and magnetic order, we also resolve the time and ultra-high frequency domains of emission, which are used to characterize both the photo-transition, and the sub-cycle structure of the electron dynamics. This extends simulation capabilities and understanding of the photo-melting of these Mott insulators in two-dimensions, at the frontier of attosecond non-equilibrium science of correlated materials.

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