Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F64: Correlated Electron Magnetism
8:00 AM–10:48 AM,
Tuesday, March 15, 2022
Room: Hyatt Regency Hotel -Grant Park B
Sponsoring
Unit:
DCMP
Chair: Trinanjan Datta, Augusta University
Abstract: F64.00009 : Ultrafast optical excitation of magnetic dynamics in van der Waals magnets: Coherent magnons and BKT dynamics in NiPS3
9:36 AM–9:48 AM
Presenter:
Urban F Seifert
(Kavli Institute for Theoretical Physics, UC Santa Barbara)
Authors:
Urban F Seifert
(Kavli Institute for Theoretical Physics, UC Santa Barbara)
Mengxing Ye
(University of California, Santa Barbara)
Leon Balents
(University of California, Santa Barbara)
In this talk, we propose two microscopic mechanisms for the optical generation of coherent magnetic excitations in van der Waals magnets, and derive the corresponding effective light-spin interactions: Either through pumping atomic orbital excitations resonantly or via a light-induced Floquet spin Hamiltonian, the ground state of the system is driven out of equilibrium. Subsequent spin dynamics can then be probed using established magneto optical techniques.
As an example, we apply our framework to NiPS3, which is magnetically ordered in the bulk, and is conjectured to realize the XY model in the monolayer limit. We find quantitative agreement with recent experiments by Afanasiev et al. in Sci. Adv. 7 eabf3096 (2021).
We further propose pump-probe experiments for monolayer NiPS3 and detail how anomalous relaxational behaviour may reveal excitations of a (proximate) BKT phase in a proposed effective XY model.
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