Eindhoven University of Technology

报告摘要：

Chiral phononics is an emerging field, in which the angular momentum of circularly polarized lattice vibrations is utilized to control the properties of materials. When chiral phonons are driven coherently with an ultrashort laser pulse, the light makes the ions in the material behave like electromagnetic coils, producing circular ionic currents around their equilibrium positions in the crystal. This induces real and effective magnetic fields that can reach the tesla scale, providing an unprecedented means for the manipulation of magnetic order. Here, I present our recent theoretical predictions of novel phenomena arising from chiral phonon excitation, specifically light-induced magnetization in antiferromagnets and light-induced multiferroicity in nonmagnetic nonpolar materials. Furthermore, I will show how light can be used to make achiral materials chiral through a phononic rectification process that breaks all improper rotation symmetries of the crystal structure. These predictions highlight phonon chirality as a fundamental tool to create new functional properties in solids.

报告人简介：

Since October 2024, Prof. Juraschek is the head of the Dynamical Quantum Materials group at the Eindhoven University of Technology. Previously, he was a Senior Lecturer at Tel Aviv University from 2021-2024, where he started building his research group. He obtained his PhD in 2018 from ETH Zurich, followed by a Postdoctoral Fellowship at Harvard University from 2019-2021.

邀请人：王亚娴

联系人：张坚地（9454）