▎ 摘　　要

Modulation of the thermal properties of graphene due to strain-induced phononic band engineering was theoretically investigated by first-principles calculations based on the density functional theory. The high-energy phonon modes are found to exhibit softening owing to the strain, whereas a low-energy acoustic mode (out-of-plane mode) exhibits hardening. Moreover, the dispersion relation of the out-of-plane mode associated with the strain essentially changes from quadratic (alpha k(2)) to linear (alpha k). Accordingly, the temperature dependence of the low-temperature specific heat also changes from linear (alpha T) to quadratic (alpha T-2). (C) 2017 The Japan Society of Applied Physics