This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2023-01548 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevResearch.5.L022007 in citations.
Ultrafast optical generation of antiferromagnetic meron-antimeron pairs with conservation of topological charge
Ultrafast optical generation of antiferromagnetic meron-antimeron pairs with conservation of topological charge
We propose a new mechanism to produce a meron-antimeron pair in a two dimensional antiferromagnet with an ultrafast laser pulse via thermal Schwinger mechanism. Unlike ultrafast skyrmion nucleation, this process conserves total topological charge. We systematically show different stages of the dynam...
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Personal Name(s): | Ghosh, Sumit (Corresponding author) |
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Blügel, Stefan / Mokrousov, Yuriy | |
Contributing Institute: |
JARA-FIT; JARA-FIT JARA - HPC; JARA-HPC Quanten-Theorie der Materialien; IAS-1 Quanten-Theorie der Materialien; PGI-1 |
Published in: | Physical review research, 5 (2023) 2, S. L022007 |
Imprint: |
College Park, MD
APS
2023
|
DOI: |
10.34734/FZJ-2023-01548 |
DOI: |
10.1103/PhysRevResearch.5.L022007 |
Document Type: |
Journal Article |
Research Program: |
Spin+AFM-Dynamik: Antiferromagnetismus durch Drehimpulsströme und Gitterdynamik (A11) Three-dimensional magnetization textures: Discovery and control on the nanoscale Topological Matter |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevResearch.5.L022007 in citations.
We propose a new mechanism to produce a meron-antimeron pair in a two dimensional antiferromagnet with an ultrafast laser pulse via thermal Schwinger mechanism. Unlike ultrafast skyrmion nucleation, this process conserves total topological charge. We systematically show different stages of the dynamics and define proper topological invariants to characterise the configurations. The emergent structure can retain its topological structure for up to 100ps. By introducing a topological structure factor we show that pair formation is robust against any random choice of initial magnetic configuration and can survive against disorder. Our findings demonstrate that the rich world of spin textures, which goes beyond conventional skyrmions, can be reached optically. |