二维Holstein模型的谱与导电性质的DQMC研究
A DQMC study of the spectral and conductive properties of the two-dimensional Holstein model
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中文总结 AI 辅助
该研究采用DQMC模拟，系统计算二维Holstein模型的单粒子谱函数和光导率，揭示其随载流子浓度变化的相演化规律，并附带含超16640个参数的开放数据集。
中文摘要 AI 辅助
我们采用数值精确的行列式量子蒙特卡洛（determinant quantum Monte Carlo, DQMC）模拟，研究二维正方晶格Holstein哈密顿量的动力学性质。具体而言，我们在声子能量、电子-声子耦合强度、载流子浓度和温度的一定范围内，对该模型的单粒子谱函数和光导率进行了系统计算。通过这些计算，我们绘制了系统的演化：当载流子浓度从稀释值调整到半填充时，系统从修饰金属相转变为（双）极化子液体/绝缘体，再转变为电荷密度波绝缘体。我们通过多个等时关联测量以及从时移关联测量重构的相关代理量，验证了这些结果。本文还附带一个涵盖超过16640个独特参数值的广泛开放数据集。
英文摘要
We study the dynamical properties of the two-dimensional square lattice Holstein Hamiltonian using numerically exact determinant quantum Monte Carlo simulations. In particular, we report systematic calculations of the model's single-particle spectral function and optical conductivity over a range of phonon energies, electron-phonon coupling strengths, carrier concentrations, and temperatures. In doing so, we map the evolution of the system from a dressed metallic phase to a (bi)polaron liquid/insulator to a charge-density-wave insulator as the carrier concentration is tuned from dilute values to half-filling. We corroborate these results using several equal-time correlation measurements and related proxy quantities reconstructed from time-displaced correlation measurements. This paper is also accompanied by an extensive open data set, covering over 16,640 unique parameter values.
