[20p-234B-1~17] 22.1 Joint Session M "Phonon Engineering"

▲ [20p-234B-5] Quasi-ballistic heat transport in silicon nanowires at different temperatures

〇(P)Roman Anufriev¹, Sergei Gluchko^1,2, Sebastian Volz^2,1, Masahiro Nomura^1,3 (1.IIS Univ. of Tokyo, 2.LIMMS Univ. of Tokyo, 3.JST PRESTO)

Keywords:heat conduction, nanowires, thermal transport

We study ballistic heat conduction in silicon nanowires of different lengths and shapes using the micro time-domain thermoreflectance and Monte Carlo phonon transport simulations. We demonstrate how ballistic heat conduction occurs at low temperatures and weakens as the temperature is increased. Our simulations show that phonon trajectories resemble Levy walk with short travels between the nanowire walls mixed with long flights towards the cold side. Such quasi-ballistic heat conduction in silicon nanostructures opens new possibilities in thermal engineering in microelectronics.