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Hierarchy of multi-order skyrmion phases in twisted magnetic bilayers

Ray, S and Das, T (2021) Hierarchy of multi-order skyrmion phases in twisted magnetic bilayers. In: Physical Review B, 104 (1).

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Official URL: https://doi.org/10.1103/PhysRevB.104.014410


The recent discovery of two-dimensional (2D) van der Waals magnets is a crucial turning point in the quantum magnet research field, since quantum fluctuations and experimental difficulties often elude stable magnetic orders in two dimensions. This opens new doors to delve for novel quantum and topological spin configurations, which may or may not have direct analogs in bulk counterparts. Here we study a twisted bilayer geometry of 2D magnets in which long-range spin-spin interactions naturally commence along the interlayer Heisenberg (J�) and dipole-dipole (JD) channels. The J�-JD parameter space unveils a hierarchy of distinct skyrmion phases, including point-, rod-, and ring-shaped topological charge distributions. Furthermore, we predict a topological antiferroelectric phase, where oppositely charged antiskyrmion pairs are formed, and the corresponding topological dipole moments become ordered in a Néel-like state - hence dubbed the topological antiferroelectric state. The results indicate that the twisted magnetic layer provides a versatile setting to engineer and tune a plethora of skyrmion phases and their dynamics. © 2021 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to Authors
Keywords: Antiferroelectricity; Magnetism; Magnets; Van der Waals forces, Anti ferroelectrics; Antiferroelectric state; Bulk counterpart; Experimental difficulties; Quantum fluctuation; Spin configurations; Spin-spin interaction; Two Dimensional (2 D), Topology
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 15 Nov 2021 11:42
Last Modified: 15 Nov 2021 11:42
URI: http://eprints.iisc.ac.in/id/eprint/69667

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