Qian Song氏 (Department of Physics, MIT)によるオンラインセミナーを開催いたしました

タイトル：P-wave Multiferroics
講 演 者：Dr. Qian Song
所　　属：Department of Physics, MIT
日　　時：2025/6/24th（Tue）13:00～  (JST)
場　　所：オンライン
U R L：https://u-tokyo-ac-jp.zoom.us/j/82431022494?pwd=4BiD7WPHlCWXtqPLeUhUsF6ecaNtaA.1

Altermagnets are a new class of magnetic materials possessing zero magnetization like antiferromagnets but exhibiting non-relativistic spin splitting of the electronic bands and anomalous Hall responses like ferromagnets. Recent studies have explored non-collinear non-centrosymmetric magnetic systems that exhibit odd-parity spin splitting with non-relativistic origin (p-wave magnets). Symmetry considerations suggest the possibility of coupling p-wave magnetism with ferroelectricity in polar chiral magnets, potentially allowing for novel mechanisms for electric-field control of p-wave magnetism.
In this talk, I will start by discussing our optical studies of spin spiral multiferroicity in van der Waals material NiI2 down to the two-dimensional limit. I will then focus on our recent work on electrical switching of p-wave magnetism in NiI2, and its connection to ferroelectricity and chirality. Lastly, I will conclude with an outlook for potential applications of spin-spiral multiferroics for information storage.

References
[1] Q. Song, et al. Electrical switching of a p-wave magnet. Nature 642, 64-70 (2025).
[2] Q. Song, et al. Evidence for a single layer van der Waals multiferroic. Nature 602, 601 (2022).