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Dynamic magnetic phase transition induced by parametric magnon pumping

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Title
Dynamic magnetic phase transition induced by parametric magnon pumping
Author(s)
Shan, Jun-Yi; Curtis, Jonathan B.; Guo, Mingyao; Chang Jae Roh; Rotundu, C.R.; Lee, Young S.; Narang, Prineha; Tae Won Noh; Demler, Eugene; Hsieh, D.
Publication Date
2024-02
Journal
Physical Review B, v.109, no.5
Publisher
AMER PHYSICAL SOC
Abstract
Uncovering pathways to optically drive magnetic order-disorder transitions on ultrashort timescales can lead to the realization of novel out-of-equilibrium quantum phenomena. A long-sought pathway is to directly excite a highly nonthermal energy-momentum distribution of magnons, bypassing both charge and lattice degrees of freedom. However, this remains elusive owing to the weak coupling and large momentum mismatch between photons and magnons. Here we demonstrate strong parametric excitation of magnons across the entire Brillouin zone of the antiferromagnetic insulator Sr2Cu3O4Cl2 by periodically modulating the superexchange interaction with the electric field of light. The excitation efficiency is greatly enhanced by tuning to the van Hove singularity in the magnon spectrum, sufficient to transiently collapse the antiferromagnetic state using a pulsed laser field of 109 V/m. The order parameter recovery timescale increases by over 1000 times as a function of excitation density, reflecting a crossover from high- to low-energy magnon dominated decay dynamics. This electric-field induced parametric magnon pumping mechanism is applicable to a broad range of magnetic insulators and opens up the possibility of dynamically engineering magnon distributions by design. © 2024 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14921
DOI
10.1103/PhysRevB.109.054302
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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