Sublattice ordering in a dilute ensemble of monovalent adatoms on graphene

¹  Department of Physics, Lancaster University - Lancaster, LA1 4YB, UK, EU
²  Department of Physics, University of Oslo - PO Box 1048 Blindern, N-0316 Oslo, Norway
³  Department of Physics, Columbia University - 538 West 120th Street, New York, NY 10027, USA

Corresponding author: v.cheianov@lancaster.ac.uk

Received: 14 October 2009
Accepted: 22 February 2010

Abstract

When adsorbents attach themselves to carbons in the honeycomb lattice of graphene, they may preferentially take positions on one of its two sublattices, thus breaking the global lattice symmetry. This leads to opening a gap in the electronic spectrum. We show that such a sublattice ordering may spontaneously occur in a low-density ensemble of adatoms adsorbed on graphene, due to the long-range interaction between them mediated by electrons. As a result sublattice-ordered domains may form, with electronic properties characteristic of a two-dimensional topological insulator.