2003/12/05 by M. de Boissieu, R. Currat, de Boissieu, M. +7
Materials Science · Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Quasicrystal Structures and Properties #cond-mat.dis-nn #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/0312163
14 pages, 3 eps figures, Revtex-4, accepted to Phys. Rev. B
arxiv created 2003/12/05 · openalex publication_date 2003/12/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose a simple phenomenological model to analyze vibrational characteristics of quasicrystals (QCs). The interpretation of the obtained recently data is based on the existence of almost dispersionless optical modes most probably related to the specific clusters which constitute the characteristic building blocks of any QC structure. We generalize to QCs the well - known Akhiezer mechanism, which in our case is related to a ''long wave'' disturbance of the quasicrystalline optical modes by the propagating sound modes. At higher wave vectors strong hybridization of acoustic and optical modes takes place, and it leads to a more steep broadening dependence on wave vectors, and besides the excitation can no longer be described as a single acoustic mode with a well defined wave vector.