Engineering bands of extended electronic states in a class of topologically disordered and quasiperiodic lattices

Biplab Pal, Arunava Chakrabarti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We show that a discrete tight-binding model representing either a random or a quasiperiodic array of bonds can have the entire energy spectrum or a substantial part of it absolutely continuous, populated by extended eigenfunctions only, when atomic sites are coupled to the lattice locally, or non-locally from one side. The event can be fine-tuned by controlling only the host-adatom coupling in one case, while in two other cases cited here an additional external magnetic field is necessary. The delocalization of electronic states for the group of systems presented here is sensitive to a subtle correlation between the numerical values of the Hamiltonian parameters - a fact that is not common in the conventional cases of Anderson localization. Our results are analytically exact, and supported by numerical evaluation of the density of states and electronic transmission coefficient.

Original languageEnglish
Pages (from-to)2782-2789
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume378
Issue number37
DOIs
StatePublished - 25 Jul 2014
Externally publishedYes

Keywords

  • Ballistic transport
  • Delocalization
  • Single electron states
  • Tight binding model

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