Trace map properties of variations of Fibonacci chains

Tadashi Takemori, Masahiro Inoue, Hiroshi Miyazaki

Research output: Contribution to journalArticle

Abstract

The electronic trace-map for one-dimensional tight-binding binary chains with a constant nearest-neighbour interaction, whose atomic sequence is generated by the stacking rule C(1) = B, C(2) = A and C(n + 1) = C(n)pC(n - 1)q, have been examined. Here A and B are the two types of atoms with different site energies, and p and q are integers >0. The invariant of the map for q = 1 becomes a 'quasi-invariant' for q > 1. Vanishing of the quasi-invariant defines a manifold in the trace space, on which the wave function is essentially Bloch-like. The wavefunction is therefore extended at a dense subset of the entire spectrum. The study of cyclic orbits on this manifold suggests that an invariant exists only when q = 1 or q = p + 1. The bandwidth distribution has fractal structure only when q = 1. For q > 1, most of the states are extended, but are interspersed with localized states whose distribution appears to be fractal.

Original languageEnglish
Pages (from-to)944-948
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume156-158
Issue numberPART 2
DOIs
Publication statusPublished - 1993 May 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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