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

• Published in: Physics letters. A Vol. 378; no. 37; pp. 2782 - 2789
• Main Authors: Pal, Biplab, Chakrabarti, Arunava
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25-07-2014
• Subjects: Ballistic transport; Delocalization; Single electron states; Tight binding model; Single electron states; Ballistic transport; Delocalization; Tight binding model
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2014.07.034

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.
•Electronic spectrum of a class of disordered and quasiperiodic lattices is examined.•The systems can show spectral crossover under appropriate correlations.•A tunable magnetic flux can also engineer absolutely continuous energy bands.•Flux driven state transitions are shown to be interesting possibilities.•Two terminal electronic transmission is investigated in details.