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学术报告信息一则(202115):Ferroelectric switching and ultrafast simulations

发布日期:2021-12-23 作者: 编辑:科研办公室 点击:

报告题目:Ferroelectric switching and ultrafast simulations

报告人:陈鹏 博士(美国阿肯色大学物理系)

主持人(邀请人): 张立军 教授

报告时间:2021年12月27日10:00-11:30

网络报告地点:中心校区唐敖庆楼D区429室(网络报告地点)

腾讯会议链接:https://meeting.tencent.com/dm/s3aeSdERwhB4

会议ID: 298-862-688

主办单位:汽车材料教育部重点实验室,材料科学与工程学院

摘要:Ultrafast light-matter interactions present a promising route to control ferroelectric polarization. One emergent light-induced technique for controlling polarization consists in anharmonically driving another high-frequency phonon mode. A step towards such technique has been recently accomplished in the experiment (Phys. Rev. Lett. 118, 197601), but the polarization was reported to be only partially reversed and for a short lapse of time. It is presently unclear if a full control of a polarization can be achieved by activating such high-frequency phonon mode via terahertz pulse stimuli. In this talk, a realistic model on the prototypical ferroelectric KNbO3 will be introduced, which not only allows us to reproduce a polarization transient partial reversal analogous to the experiment, but also uncovers other light-driven effects. In particular, it further reveals and explains (1) how a full reversal can indeed happen in some cases; and (2) also predict a variety of other light-induced polarization reorientations as a result of a mechanism we coin as “squeezing” effect. Such “squeezing” mechanism further allows us to design a strategy for an ultrafast deterministic control of the polarization. In the end, I will introduce our code LINVARIANT that is used for this light-matter simulation project. LINVARIANT is a first-principle based multi-physics and multi-scale simulation toolkit that is capable to construct effective Hamiltonian for ferroelectric, magnetic, and electronic materials and solve them in large scale at finite temperature.

报告人简介:

Dr. Peng Chen obtained his Ph.D. in Theoretical Physics from the Institute of Physics, Chinese Academy of Sciences (China). He is currently a postdoc researcher at the Department of Physics, University of Arkansas (US). He was a Research Associate at the Italian Institute of Technology (Italy) and a visiting scholar at the Luxembourg Institute of Science and Technology (Luxembourg). He has published as the first/co-first and corresponding author high-impact journals including Nature materials (1), Physics Review Letter (1), Advanced Materials (1), and Physics Review B (3). His main research interests focus on the couplings of different ferroic orders and light-matter interactions in materials at multiscale levels.


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