报告题目Title：Theory for light-control of materials properties using mid-infrared pulses(中红外脉冲光控铁电材料物性的微观理论研究)
报 告 人Speaker：Alaska Subedi(Centre de Physique Theorique, Ecole Polytechnique, France )
报告时间Time：2017.4.26. (Wed) 15:30
报告地点Venue：E106 Meeting Room 会议室，8455新葡萄场网站量子与分子结构国际中心SHU ICQMS
摘要：Controlling and enhancing the physical properties of materials is a challenge for both potential applications and basic science research.
Recently, low-energy mid-infrared light pulses that couple to the infrared-active phonon modes of a material have been used as a novel way to control the materials in an ultrafast time scale. However, how
the light pulses, which impart oscillating forces, can cause persistent and coherent changes to materials properties has not been fully elucidated.
In this talk, I will present a microscopic theory for such phenomena that is based on symmetry principles, realistic calculations of the energy
landscape of the materials as a function of phonon coordinates, and the solution of the equations of motion of the lattice. I will also discuss a recent
prediction for ultrafast switching of ferroelectrics using this technique.
