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arXiv 1507.01200cond-mat.str-el
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基于泵浦-探测模拟的光学电导率数值计算方法

Numerical method to compute optical conductivity based on pump-probe simulations

Can Shao, Takami Tohyama, Hong-Gang Luo, Hantao Lu

摘要:

提出了一种基于泵浦-探测装置的数值计算电导率的方法。通过对半满一维扩展哈伯德模型平衡态和非平衡态的具体数值模拟,验证了该方法的有效性和局限性。通过采用一个步骤或高斯样的探测矢量势,它被发现,在非平衡状态下,在窄探测脉冲限制的方法可以确定与不同类型的线性响应理论,其中,在平衡状态下,产生相同的结果。观测结果揭示了非平衡态下光学电导率计算的潜在探测脉冲依赖性,这可能在超快光谱测量的理论分析中有其应用。

英文摘要:

A numerical method to calculate optical conductivity based on a pump-probe setup is presented. Its validity and limits are tested and demonstrated via the concrete numerical simulations on the half-filled one-dimensional extended Hubbard model both in equilibrium and out of equilibrium. By employing either a step- or a Gaussian-like probing vector potential, it is found that in nonequilibrium, the method in the narrow-probe-pulse limit can be identified with variant types of linear response theory, which, in equilibrium, produce identical results. The observation reveals the underlying probe-pulse dependence of the optical conductivity calculations in nonequilibrium, which may have its applications in the theoretical analysis of ultrafast spectroscopy measurements.

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