Driving spin chirality by electron dynamics in laser-excited antiferromagnets

Ghosh S, Freimuth F, Gomonay O, Bluegel S, Mokrousov Y (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Communications Physics Springer Nature

Book Volume: 5

Article Number: 69

Journal Issue: 1

DOI: 10.1038/s42005-022-00840-3

Abstract

Despite recent successes in the area of ultrafast manipulation of magnetic order, optical generation and manipulation of complex spin textures is hindered by an insufficient theoretical understanding of underlying processes. In particular an important aspect of subtle connection between the electronic and magnetic degrees of freedom is not properly accounted for in existing theories. Here, we uncover a distinct physical mechanism for imprinting spin chirality into collinear magnets with short laser pulses. By simultaneously treating the laser-ignited evolution of electronic structure and magnetic order, we show that their intertwined dynamics can result in an emergence of quasi-stable chiral states. We find that laser-driven chirality does not require any auxiliary external fields or intrinsic spin–orbit interaction to exist, and it can survive on the time scale of nanoseconds even in the presence of thermal fluctuations, which makes the uncovered mechanism relevant for understanding various optical experiments on magnetic materials. Our findings provide a more detailed perspective of the complex interactions which occur between chiral magnetism and light.

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE)

How to cite

APA:

Ghosh, S., Freimuth, F., Gomonay, O., Bluegel, S., & Mokrousov, Y. (2022). Driving spin chirality by electron dynamics in laser-excited antiferromagnets. Communications Physics, 5(1). https://dx.doi.org/10.1038/s42005-022-00840-3

MLA:

Ghosh, Sumit, et al. "Driving spin chirality by electron dynamics in laser-excited antiferromagnets." Communications Physics 5.1 (2022).

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