Monopole field textures in interacting spin systems

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Abstract

Magnetic monopoles can appear as emergent structures in a wide range of physical settings, ranging from spin ice to Weyl points in semimetals. Here, a distribution of synthetic (Berry) monopoles in parameter space of a slowly changing external magnetic field is demonstrated in a system of interacting spin-12 particles with broken spherical symmetry. These monopoles can be found at points where the external field is nonzero. The spin-spin interaction provides a mechanism for splitting the synthetic local magnetic charges until their magnitude reaches the smallest allowed value 12. For certain states, a nonzero net charge can be created in an arbitrarily large finite region of parameter space. The monopole field textures contain nonmonopolar contributions in the presence of spin-spin interaction.

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CITATION STYLE

APA

Eriksson, A., & Sjöqvist, E. (2020). Monopole field textures in interacting spin systems. Physical Review A, 101(5). https://doi.org/10.1103/PhysRevA.101.050101

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