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首页> 外文期刊>Physical review >Optical spectroscopy and electronic structure of the face-centered icosahedral quasicrystals Zn-Mg-R (R = Y, Ho, Er)
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Optical spectroscopy and electronic structure of the face-centered icosahedral quasicrystals Zn-Mg-R (R = Y, Ho, Er)

机译：面心二十面体准晶体Zn-Mg-R（R = Y，Ho，Er）的光谱学和电子结构

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摘要

Results of optical spectroscopy studies of the face-centered icosahedral (fci) single-grain Zn-Mg-Y, Zn-Mg-Ho, and Zn-Mg-Er quasicrystals (QCs) are presented. The dielectric function of the QCs was measured in the 0.01-6 eV spectral range by IR-UV spectroscopic ellipsometry and far infrared reflection spectroscopy techniques. A theoretical scheme of optical conductivity calculations is extended to account for the Fermi level positions within and below a pseudogap. The model of the QC electron energy spectrum, based on a band structure hypothesis, is suggested, which treats the electronic subsystem as a nearly free electron gas affected by intersections of the Fermi surface with several families of Bragg planes. The experimental optical spectra are reproduced in detail by theoretical calculations carried out within the framework of the model. The parameters of the electron energy spectrum deduced from an analysis of optical data are close to those previously determined in an analysis of fci Zn-Mg-R valence band photoemission spectra.
机译：提出了以面部为中心的二十面体（fci）单晶Zn-Mg-Y，Zn-Mg-Ho和Zn-Mg-Er准晶体（QC）的光谱学研究结果。通过IR-UV光谱椭圆偏振法和远红外反射光谱技术在0.01-6 eV光谱范围内测量QC的介电功能。扩展了光导率计算的理论方案，以解决伪间隙内和伪间隙以下的费米能级位置。提出了基于能带结构假设的QC电子能谱模型，该模型将电子子系统视为受费米表面与多个布拉格平面族的相交影响的几乎自由的电子气。通过在模型框架内进行的理论计算，详细再现了实验光谱。从光学数据分析得出的电子能谱参数与先前在fci Zn-Mg-R价带光电子发射光谱分析中确定的参数接近。

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  • 来源
    《Physical review》 |2013年第9期|094201.1-094201.12|共12页
  • 作者

    V. Karpus; S. Tumenas; A. Suchodolskis; H. Arwin; W. Assmus;

  • 作者单位

    Center for Physical Sciences and Technology, Semiconductor Physics Institute, A. Gostauto 11,LT-01108 Vilnius, Lithuania;

    Center for Physical Sciences and Technology, Semiconductor Physics Institute, A. Gostauto 11,LT-01108 Vilnius, Lithuania;

    Center for Physical Sciences and Technology, Semiconductor Physics Institute, A. Gostauto 11,LT-01108 Vilnius, Lithuania;

    Laboratory of Applied Optics, Department of Physics, Chemistry and Biology, Linkoping University, SE-58183 Linkoeping, Sweden;

    J. W. Goethe-Universitaet, Physikalisches Institut, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany;

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  • 正文语种 eng
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  • 关键词

    quasicrystals;

    机译：准晶体;

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