Magnetic Structure of Nano-Graphite Moebius Ribbon

TL;DR

This paper investigates the electronic and magnetic properties of zigzag nano-graphite ribbons with Moebius boundary conditions, revealing edge states, ferrimagnetism, and magnetic domain wall formation influenced by Coulomb interactions.

Contribution

It introduces the effect of Moebius boundary conditions on nano-graphite ribbons, showing how they alter magnetic properties and domain structures compared to traditional boundary conditions.

Findings

Edge localized states cause ferrimagnetism at edges.

Moebius boundary reduces spin polarization.

Magnetic domain width depends on Coulomb interaction.

Abstract

We consider the electronic and magnetic properties of nanographite ribbon with zigzag edges under the periodic or Moebius boundary conditions. The zigzag nano-graphite ribbons possess edge localized states at the Fermi level which cause a ferrimagnetic spin polarization localized at the edge sites even in the very weak Coulomb interaction. The imposition of the Moebius boundary condition makes the system non-AB-bipartite lattice, and depress the spin polarization, resulting in the formation of a magnetic domain wall. The width of the magnetic domain depends on the Coulomb interaction and narrows with increasing U/t.