▎ 摘　　要

Based on a first-principles total-energy calculation, we demonstrate the possibility of pi electron network design in graphene using atomic Pt adsorbate. The d state of the adsorbed Pt atoms hybridizes with the pi state of graphene, which effectively creates a boundary in the two-dimensional pi electron network in graphene. By adsorbing Pt atoms along the line parallel to the zigzag direction in graphene, we found that a characteristic flat dispersion band emerges at the zone boundary of the two-dimensional Brillouin zone. This flat dispersion band is partially filled by electrons, which induces a magnetic moment in this system of non-magnetic elements. (C) 2012 Elsevier Ltd. All rights reserved.