Department of Physics, NCU
Ultrafast dynamics of materials under extreme conditions
謝文斌助研究員 (Wen-Pin Hsieh)
Institute of Earth Sciences, Academia Sinica
Recent progress in ultrafast optical and X-ray techniques provides a unique window to track the real-time motion of atoms and electrons as well as their complex interactions. Extreme pressure-temperature environments can drive materials into exotic states, offering a new platform to synthesize novel materials with potential applications. Combining ultrafast techniques with extreme environments enables in situ probing of the dynamics of emergent states over a wide, unexplored pressure-temperature area, which will lead to exciting and unexpected discoveries. In this talk, I will present some examples of using ultrafast lasers coupled with high-pressure diamond anvil cells to explore the physics of nanoscale thermal transport in thin films [1, 2] and phase transition dynamics in strongly correlated materials . I will also discuss possibilities of using this novel combination to study energy-related materials, for example, thermoelectric and phase change materials.
 Wen-Pin Hsieh, B. Chen, J. Li, P. Keblinski, and David G. Cahill, ”Pressure tuning of the thermal conductivity of the layered muscovite crystal,” Phys. Rev. B 80, 180302(R) (2009).
 Wen-Pin Hsieh, Austin Lyons, Eric Pop, Pawel Keblinski, and David G. Cahill, “Pressure tuning of the thermal conductance of weak interfaces,” Phys. Rev. B 84, 184107(2011).
 Wen-Pin Hsieh, Mariano Trigo, David Reis, G. Artioli, Lorenzo Malavasi, and Wendy L. Mao, “Evidence for photo-induced monoclinic metallic VO2 under high pressure,” Appl. Phys. Lett. 104, 021917 (2014).