Graphene nanoribbons (GNRs) recently have drawn much interest because of their novel electronic properties such as well-controlled electronic structures, high Seebeck coefficient, and intriguing electronic transport. For the thermoelectric energy conversion, GNRs are thought to be rather poor candidates because of too high phonon thermal conductance, though they own good electronic conduction. Thus, the reduction of the phonon thermal conductance of GNRs is particularly important for their thermoelectric applications. Several methods such as strain, structural defects, etc., have been proposed...
