Science Daily  December 21, 2021 Often the thermal energy generated in the device during operation must cross several dissimilar materials during the process and the interface between these materials can impede heat flow. An international team of researchers (Georgia Institute of Technology, University of Notre Dame, UC Irvine, US.S. Naval Research Laboratory, UCLA, Oak Ridge National Laboratory, South Korea) observed the interfacial phonon modes experimentally at a high-quality Si-Ge epitaxial interface by using Raman Spectroscopy and high-energy resolution electron energy-loss spectroscopy (EELS). To figure out the role of interfacial phonon modes in heat transfer at interfaces, they used time-domain thermoreflectance […]