[24a-F407-1~10] 22.1 Joint Session M "Phonon Engineering"

[24a-F407-1] [The 51st Young Scientist Presentation Award Speech] Reduction of Thermal Conductivity of Metal-Insulator Superlattice using Non-Equilibrium Electron-Phonon Heat Transport near the Interface

〇Kyoungjung Kim¹, Yosuke Kurosaki², Naoto Fukatani², Shin Yabuuchi², Yusuke Ira¹, Cheng Shao¹, Jun Hayakawa², Junichiro Shiomi¹ (1.Eng., Tokyo Univ., 2.R&D, Hitachi Ltd)

Keywords:Metal-Insulator superlattice, Electron-Phonon coupling, Nano-scaled heat transport

In this research, the thermal conductivity of superlattice composed of metal with different electron-phonon coupling (AuSi, Cu, Ta) and insulator (MgO) is measured by Time-Domain thermoreflectance and the result is analyzed by a two-temperature model. As a result, it becomes obvious that energy exchange between the heat carriers highly disturbs heat conduction in the superlattice composed of the metals with weak electron-phonon coupling (AuSi, Cu) and the effect depends on the thickness of the metal layer. This result proves that the electron-phonon non-equilibrium heat transport near the metal-insulator interface shows size effect.