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arXiv 1504.00271cond-mat.mtrl-sciphysics.optics
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非均匀金属氢等离子体的光学特性

Optical properties of inhomogeneous metallic hydrogen plasmas

N. Van den Broeck, F. Brosens, J. Tempere, I. F. Silvera

摘要:

我们调查的光学性质的氢,因为它经历了从绝缘分子的过渡到金属原子相,当在兆巴压力的脉冲激光加热金刚石砧室。目前大多数实验试图通过检测光学反射率和/或透射率的变化来观察这种转变。这种变化的理论模型的基础上的介电函数计算散装,均匀的材料板。在实验上,人们期望氢等离子体密度在长度尺度上变化,其基本上不小于探测光的波长。我们表明,考虑到这种不均匀性可以导致显着的反射率和透射率的修正。我们提出了一种技术来计算系统的光学性质与一个平稳变化的载流子密度,确定在金刚石砧室实验中的金属氢的光学响应,并与标准结果进行对比。通过分析最近的实验结果,我们得到了金属氢在170 GPa和1250 K下的电导率$σ^{Drude}_{DC}=(2.1 \pm 1.3) \times 10^3$($Ω$ cm)$^{-1}$。

英文摘要:

We investigate the optical properties of hydrogen as it undergoes a transition from the insulating molecular to the metallic atomic phase, when heated by a pulsed laser at megabar pressures in a diamond anvil cell. Most current experiments attempt to observe this transition by detecting a change in the optical reflectance and/or transmittance. Theoretical models for this change are based on the dielectric function calculated for bulk, homogeneous slabs of material. Experimentally, one expects a hydrogen plasma density that varies on a length scale not substantially smaller than the wave length of the probing light. We show that taking this inhomogeneity into account can lead to significant corrections in the reflectance and transmittance. We present a technique to calculate the optical properties of systems with a smoothly varying density of charge carriers, determine the optical response for metallic hydrogen in the diamond anvil cell experiment and contrast this with the standard results. Analyzing recent experimental results we obtain $σ^{Drude}_{DC}=(2.1 \pm 1.3) \times 10^3$ ($Ω$ cm)$^{-1}$ for the conductivity of metallic hydrogen at 170 GPa and 1250 K.

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