Issue 3, 2009

Odd–even width effect on persistent current in zigzag hexagonal graphene rings

Abstract

The electronic structure and thus the persistent current of zigzag hexagonal graphene rings are investigated within the tight-binding formalism. The flux-dependent energy spectrum is grouped into bands with six levels per band due to inter-valley scattering at the corners of the ring. It is found that the degeneracy at the Fermi level is determined by the even or odd quality of the ring width N. The sample ring becomes metallic at odd N but semiconducting at even N, showing up a strange odd–even width effect. In metallic rings, the persistent current within a flux period is linearly changed with magnetic fluxϕ, while it is a sinusoidal periodical function of ϕ in semiconducting rings. In addition, with increasing N, the persistent current exponentially decreases (increases) at odd (even) N, but finally falls into the consistence with each other at enough large N, showing that the odd–even effect may be experimentally observable only in narrow rings.

Graphical abstract: Odd–even width effect on persistent current in zigzag hexagonal graphene rings

Article information

Article type
Paper
Submitted
29 apr 2009
Accepted
24 avq 2009
First published
29 sen 2009

Nanoscale, 2009,1, 387-390

Odd–even width effect on persistent current in zigzag hexagonal graphene rings

M. M. Ma, J. W. Ding and N. Xu, Nanoscale, 2009, 1, 387 DOI: 10.1039/B9NR00044E

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