Erratum: Valley-based field-effect transistors in graphene [Phys. Rev. B 86, 165411 (2012)] Graphene Times, 09 Jan 2013 Author(s): N.-Y. Lue, Y.-C. Chen, and G. Y. Wu [Phys. Rev. B 87, 039904] Published Wed Jan 09, 2013 link.aps.org