▎ 摘　　要

Taking graphene nanoribbons (GNRs) and gamma-graphyne nanoribbons (GYNRs) as examples, we demonstrate that the twisted deformation is an efficient method to modulate the thermal transport properties of materials. The nonequilibrium Green's function results show that the thermal conductance of this two carbon nanoribbons can be modulated controllably and reversibly over a wide range (more than 55% at room temperature) by controlling the twisted angle, while the tuning range of the twisted angle depends on the width and length of the system. The further analysis reveals that the reduction of thermal conductance mainly originates from the phonon scattering due to the inhomogeneous force constant in the twisted nanoribbons. These interesting findings indicate that twisted GNRs and GYNRs can be utilized as thermal conductance modulators and provide useful guidance for designing materials with desired thermal conductance. (C) 2014 AIP Publishing LLC.