Optical conductivity of icosahedral quasi-crystals
Optical conductivity of icosahedral quasi-crystals
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二十面体准晶的光导率
DOI：
10.1088/0953-8984/4/47/024
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
S. Burkov
中科院分区：
文献类型：
--
作者：
S. Burkov
认为面心二十面体准晶体的光学导电性主要受带结构效应的影响。FCI准晶体与传统金属合金的不同之处是其互易晶格向量的高多重性（即42），这使得费米球和相应的布拉格平面（“准布里渊区”）之间更好地匹配。这种效应也是通过大量的光学质量增加而不是异常的强散射局域化导致直流电导率的强烈降低的原因。反过来，低直流电导率意味着交流电导率的弱德鲁德部分被更强的带间吸收所淹没，从而抑制了德鲁德峰。
It is argued that the optical conductivity of face-centred icosahedral (FCI) quasi-crystals is dominated by band-structure effects. What makes FCI quasi-crystals different from conventional metallic alloys is the high multiplicity (namely, 42) of their reciprocal lattice vectors, which allows a better match between the Fermi sphere and the corresponding set of Bragg planes (the 'quasi-Brillouin zone'). This effect is also responsible for a strong reduction in the DC conductivity through a substantial optical mass increase, rather than anomalously strong scattering localization. The low DC conductivity, in turn, means that the weak Drude part of the AC conductivity is overwhelmed by stronger interband absorption resulting in a suppression of the Drude peak.