Global phase diagram of one-dimensional graded diatomic elastic chains: a diagrammatic approach to identifying vibrational normal modes
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AbstractWe study vibrational normal modes in graded diatomic chains wherein the masses m(1) of one type of atom vary linearly with the gradient c while those of the other type m(2) remain constant, in order to examine the diatomic effect on one-dimensional graded elastic chains. By means of a band overlapping picture - a convenient diagrammatic approach - we found six distinct kinds of vibrational mode, four of which are localized and two extended. Depending on their characteristics, we are also able to categorize these modes into acoustic and optical modes. Furthermore, investigating transitions among these rich normal modes we construct the global phase diagrams of vibrational modes in the omega-c space. All results are verified by numerical calculations in finite size systems.
All Author(s) ListXiao JJ, Yakubo K, Yu KW
Journal nameJournal of Physics: Condensed Matter
Volume Number19
Issue Number2
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Condensed Matter; PHYSICS, CONDENSED MATTER

Last updated on 2021-11-05 at 01:16