This article has an erratum: [erratum]

Issue
EPL
Volume 97, Number 6, March 2012
Article Number 67005
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/97/67005
Published online 20 March 2012

© EPLA, 2012