Zigzag graphene nanoribbon edge reconstruction with Stone-Wales defects

J. N. B. Rodrigues, P. A. D Gonçalves, N. F. G. Rodrigues, R. M. Ribeiro, J. M. B. Lopes dos Santos, N. M. R. Peres

Research output: Contribution to journalJournal articleResearchpeer-review

376 Downloads (Pure)

Abstract

In this paper, we study zigzag graphene nanoribbons with edges reconstructed with Stone-Wales defects, by means of an empirical (first-neighbor) tight-binding method, with parameters determined by ab initio calculations of very narrow ribbons. We explore the characteristics of the electronic band structure with a focus on the nature of edge states. Edge reconstruction allows the appearance of a new type of edge states. They are dispersive, with nonzero amplitudes in both sublattices; furthermore, the amplitudes have two components that decrease with different decay lengths with the distance from the edge; at the Dirac points one of these lengths diverges, whereas the other remains finite, of the order of the lattice parameter. We trace this curious effect to the doubling of the unit cell along the edge, brought about by the edge reconstruction. In the presence of a magnetic field, the zero-energy Landau level is no longer degenerate with edge states as in the case of the pristine zigzag ribbon.
Original languageEnglish
Article number155435
JournalPhysical Review B
Volume84
Issue number15
ISSN0163-1829
DOIs
Publication statusPublished - 2011

Keywords

  • GRAPHENE

Fingerprint Dive into the research topics of 'Zigzag graphene nanoribbon edge reconstruction with Stone-Wales defects'. Together they form a unique fingerprint.

Cite this