Absolutely continuous energy bands in the electronic spectrum of quasiperiodic ladder networks

Biplab Pal, Arunava Chakrabarti

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The energy spectra of quasi-one-dimensional quasiperiodic ladder networks are analyzed within a tight binding description. In particular, we show that if a selected set of sites in each strand of a ladder is tunnel-coupled to quantum dots attached from a side, absolutely continuous subbands can be generated in the spectrum if one tunes the dot potential and the dot-strand coupling appropriately. Typical cases with two and three strand Fibonacci ladders in the off-diagonal model are discussed in details. We also discuss the possibility of re-entrant insulator-metal transition for a general n-strand ladder network when n becomes large. The observations remain valid even in the case of a disordered ladder network with the same constituents. The results are analytically exact.

Original languageEnglish
Pages (from-to)188-195
Number of pages8
JournalPhysica E: Low-Dimensional Systems and Nanostructures
StatePublished - 1 Jan 2014
Externally publishedYes


  • Aperiodic nanostructure
  • Charge transport
  • Metal-insulator transition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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