VIBRATIONAL PROPERTIES OF AN OCTAGONAL QUASI-CRYSTAL

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	VIBRATIONAL PROPERTIES OF AN OCTAGONAL QUASI-CRYSTAL
	Z. Y. Liu; Z. H. Zhang; J. Qing; D. C. Tian
	1992
发表期刊	Journal of Physics-Condensed Matter
ISSN	0953-8984
卷号	4 期号:29 页码:6343-6354
摘要	The vibrational densities of states for an octagonal quasiperiodic lattice are calculated. Crossovers from phonon excitations to fracton-like excitations are found in the low-frequency parts of the spectra (this part is referred to as the continuous spectrum); meanwhile, localized vibrational modes are observed in the high-frequency parts (this part is referred to as the characteristic spectrum). The spectral features are governed by alpha and beta, the central and non-central force constants of the Born model. For the low-frequency continuous spectrum, when alpha/beta equals unity (isotropic model) and when alpha/beta is not very large, a power law is satisfied in the fracton-like excitation frequency regime but, when alpha/beta approaches infinity, the spectrum deviates from the original power law. For the high-frequency characteristic spectrum, in an isotropic situation, i.e. in the case when alpha/beta = 1, the localized mode is isolated and a gap separates it from other modes but, when there is no longer isotropy, the gap disappears.
部门归属	acad sinica,int ctr mat phys,shenyang 110015,peoples r china.;liu, zy (reprint author), wuhan univ,dept phys,wuhan 430072,peoples r china
关键词	Local Atomic Environment Tight-binding Bands Penrose Lattice States Diffusion Spectrum
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/39264
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Y. Liu,Z. H. Zhang,J. Qing,et al. VIBRATIONAL PROPERTIES OF AN OCTAGONAL QUASI-CRYSTAL[J]. Journal of Physics-Condensed Matter,1992,4(29):6343-6354.
APA	Z. Y. Liu,Z. H. Zhang,J. Qing,&D. C. Tian.(1992).VIBRATIONAL PROPERTIES OF AN OCTAGONAL QUASI-CRYSTAL.Journal of Physics-Condensed Matter,4(29),6343-6354.
MLA	Z. Y. Liu,et al."VIBRATIONAL PROPERTIES OF AN OCTAGONAL QUASI-CRYSTAL".Journal of Physics-Condensed Matter 4.29(1992):6343-6354.