Thermal Science and Engineering is the study of understanding and applying the physical phenomena related to the mechanisms of heat, temperature, and energy transfer, conversion, and storage. In modern industries and technologies, heat plays a key role in various processes such as power generation, cooling, and the operation of electronic devices. Accurately understanding and controlling these mechanisms is essential for improving performance and enhancing energy efficiency. In particular, solid-state thermal science and engineering is essential for precise and localized thermal management and high-performance electronic and material design due to its advantages of simple and robust structures and fast response times, which are especially important for the advancement of semiconductors and nanotechnology. Heat transfer in solids occurs through the behavior and interaction of various quasiparticles, such as phonons and magnons. A deep understanding of these mechanisms can lead to the discovery of new thermal effects and the development of higher-performance materials. Our research group analyzes the behavior of these quasiparticles and conducts research to apply these insights.