Meron-like topological spin defects in monolayer CrCl3

Xiaobo Lu, Ruixiang Fei, Linghan Zhu and Li Yang ()
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Xiaobo Lu: Washington University in St. Louis
Ruixiang Fei: Washington University in St. Louis
Linghan Zhu: Washington University in St. Louis
Li Yang: Washington University in St. Louis

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Noncollinear spin textures in low-dimensional magnetic systems have been studied for decades because of their extraordinary properties and promising applications derived from the chirality and topological nature. However, material realizations of topological spin states are still limited. Employing first-principles and Monte Carlo simulations, we propose that monolayer chromium trichloride (CrCl3) can be a promising candidate for observing the vortex/antivortex type of topological defects, so-called merons. The numbers of vortices and antivortices are found to be the same, maintaining an overall integer topological unit. By perturbing with external magnetic fields, we show the robustness of these meron pairs and reveal a rich phase space to tune the hybridization between the ferromagnetic order and meron-like defects. The signatures of topological excitations under external magnetic field also provide crucial information for experimental justifications. Our study predicts that two-dimensional magnets with weak spin-orbit coupling can be a promising family for realizing meron-like spin textures.

Date: 2020
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DOI: 10.1038/s41467-020-18573-8

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