Ultrafast optical generation of antiferromagnetic texture-antitexture pair*

In this presentation we demonstrate the generation of an antiferromagnetic texture-antitexture pair with the help of an ultrafast laser [1]. We adopt a hybrid quantum-classical evolution scheme which consider both electronic and magnetic system on equal footing and reveals their intertwined dynamics [2]. By analysing the different stages of the dynamics we systematically identify the emergence of topological order in real time. The process does not require any intrinsic spin-orbit coupling or external magnetic field and conserves total topological charge. The texture can survive for 100ps and is fairly robust against scalar impurity.

[1] S. Ghosh, S. Blu¨gel and Y. Mokrousov. arXiv:2205.12100. http://arxiv.org/abs/2205.12100

[2] S. Ghosh, et.al. Comm. Phys., 5(1), 69, 2022.[arXiv:2011.01670] https://www.nature.com/articles/s42005-022-00840-3