[13a-PB3-1~9] 22.1 Joint Session M "Phonon Engineering"

[13a-PB3-7] Control of Phonon Transport in Graphene Isotopic Interfaces

〇Yoshito Hata¹, Yoji Notani¹, Akira Hida², Kuniharu Takei¹, Seiji Akita¹, Koji Ishibashi², Takayuki Arie¹ (1.Osaka Pref. Univ., 2.RIKEN)

Keywords:graphene, phonon transport, heat transport

Due to its outstanding thermal properties, graphene is one of the promising candidates for thermal management devices. In this study, we investigate the effect of isotopic interfaces on the heat transport properties using single crystalline graphene isotopic heterostructures. The apparent thermal resistance of the devices with respect to the interface number indicates that the resistance increases linearly as the interface number less than 4. In the device with 4 interfaces, however, the resistance increases more significantly. As the distance between interfaces is approximately 600 nm in this device, which is shorter than the reported mean free path of phonon in graphene at room temperature, the heat transport in the device more likely changes from diffusive to quasi-ballistic regime, leading to a dramatic increase in the interfacial thermal resistance.