This article was published in the Journal of Physics: Condensed Matter [© IOP Publishing] and the definitive version is available at: http://dx.doi.org/10.1088/0953-8984/17/10/001
Boshen HeIgnacio Martín-FabianiRoland RothGyula I. TóthAndrew J. Archer
M. RexH. H. WensinkHartmut Löwen