TY - JOUR
T1 - Engineering bands of extended electronic states in a class of topologically disordered and quasiperiodic lattices
AU - Pal, Biplab
AU - Chakrabarti, Arunava
N1 - Funding Information:
Biplab Pal gratefully acknowledges a DST-INSPIRE Fellowship, and AC is thankful to DST , India for partial financial support through a PURSE programme of the University of Kalyani.
Publisher Copyright:
©2014 Elsevier B.V. All rights reserved.
PY - 2014/7/25
Y1 - 2014/7/25
N2 - 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.
AB - 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.
KW - Ballistic transport
KW - Delocalization
KW - Single electron states
KW - Tight binding model
UR - http://www.scopus.com/inward/record.url?scp=84908701647&partnerID=8YFLogxK
U2 - 10.1016/j.physleta.2014.07.034
DO - 10.1016/j.physleta.2014.07.034
M3 - Article
AN - SCOPUS:84908701647
SN - 0375-9601
VL - 378
SP - 2782
EP - 2789
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 37
ER -