Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session GG05: V: Electrons, Phonons, Electron-Phonon Scattering and Phononics I
12:30 PM–2:42 PM,
Monday, March 20, 2023
Room: Virtual Room 5
Sponsoring
Unit:
DCOMP
Chair: Rohit Goswami, Science Institute, University of Iceland & Quansight Labs,TX
Abstract: GG05.00001 : Femto- phono- magnetism
12:30 PM–1:06 PM
Presenter:
Sangeeta Sharma
(Max Born Institute, Berlin)
Author:
Sangeeta Sharma
(Max Born Institute, Berlin)
In my talk I will advocate a parameter free ab-initio approach to treating ultrafast light-matter interactions, and discuss how this approach has led both to new answers to these old questions but also to the uncovering of novel and hitherto unsuspected early time spin dynamics phenomena [1,2]. In particular I will show that selective excitation of optical phonon modes exert a strong influence on femtosecond demagnetisation[3] in laser pumped materials. Amongst the available phonon modes that could be optically excited, a strong spin-phonon coupled mode that dominates the early spin dynamics can be identified. Underpinning this strong phono-magnetism we deduce a new physical mechanism of inter-site charge transfer, dominant in the minority channel. Our finding demonstrates that the nuclear system, typically assumed to play a role of an energy sink aiding remagnetization of the spin system, can play a profound role in controlling femtosecond demagnetization of magnetic materials.
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