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Ab initio simulations for expanded gold fluid in metal-nonmetal transition regime

机译:AB Initio模拟金属 - 非金属过渡制度的膨胀金液

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Ab initio simulations based on quantum molecular dynamics have been performed to study the electrical and optical properties of expanded gold fluids from one to a sixth of the normal solid density and with temperatures varying from 5000 to 20 000 K. With decreasing density, the dynamic conductivity evolves from the characteristic of a metal to that of a nonmetal. The DC conductivity is given by fitting the dynamic conductivity using the Drude or Drude-Smith model. According to the shift of the central peak of dynamic conductivity, the change of the slope of DC conductivity with respect to temperature, and the appearance of the disconnected network in the charge density distribution, the metal-nonmetal transition of expanded gold fluids occurs in the vicinity of one-third of the normal solid density. In addition, as the density decreases, the localization of 6s and 5d states is observed in the density of states.
机译:已经进行了基于量子分子动力学的AB Initio模拟,以研究膨胀金流体的电气和光学性能从一到第六个正常的固体密度,并且温度从5000到20 000 k的温度变化。密度降低,动态电导率 从金属的特征到非金属的特征发展。 通过使用博德或博德 - 史密斯模型拟合动态电导率来给出DC电导率。 根据动态电导率的中心峰值的偏移,DC电导率斜率相对于温度的变化,以及在电荷密度分布中的断开网络的外观,膨胀金流体的金属 - 非金属过渡发生在 附近的正常固体密度的三分之一。 另外,随着密度降低,在状态的密度下观察到6S和5D状态的定位。

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