声子学与热超结构材料

Phonons, the quantized lattice vibration, can transport in all solids.They are the main heat carriers in dielectric materials and semiconductors.Therefore, the control and management of phonons is of primary important forindustrial application, like waste heat harvesting, heat dissipation andmanagement of micro and nano electronic device, molecular electronic devices,quantum computer etc. More importantly, heat is a primary energy source for allliving organisms. The understanding of the control mechanism might also help usget a clear picture of how living organism manage the heat energy inside.However, controlling heat carried by phonons is not as easy ascontrolling electrons and photons, because phonons are not particles. Moreover,phonons do not have mass and charge that makes the control by external fieldlike electric and magnetic fields much more complicated and challenging.The phononics provides new approach on heat control. In this course, theunderlying principle of thermal rectifier/diode, thermal transistor, thermallogic gates and thermal memory etc will be discussed. We will also discuss howto design thermal rectifier and other functional thermal devices. Thermal metamaterials use existing natural materials to manipulate heatflux by changing its structures. The underlying principle is transforming invarianceof the heat conduction equation. We will discuss several important functionsand applications like thermal cloak, thermal concentrator, thermal lens,thermal camouflage, thermal inverter … Challenges and difficulties in thermalcloak will be discussed. The course will cover the following8 parts: 1) Phonons, anharmonicphonons, and thermal transport;2) Phononic Thermal Circuits:Active Control of heat flow via temperature bias3) Dynamical control of heatflux and beyond4) Heat control via phononiccrystals5) Heat control through thermalmetamaterials6) Thermal interfacialmaterials (TIM): controlling heat via interface7) Advanced topics of phononics8) Experimental methods forprobing phonons and heat transfer due to phonons