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Monopole field textures in interacting spin systems

Andreas Eriksson and Erik Sjöqvist
Phys. Rev. A 101, 050101(R) – Published 29 May 2020

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.

  • Figure
  • Figure
  • Received 13 March 2020
  • Accepted 6 May 2020

DOI:https://doi.org/10.1103/PhysRevA.101.050101

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

Published by the American Physical Society

Physics Subject Headings (PhySH)

General PhysicsAtomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Andreas Eriksson and Erik Sjöqvist*

  • Department of Physics and Astronomy, Uppsala University, Box 516, Se-751 20 Uppsala, Sweden

  • *erik.sjoqvist@physics.uu.se

Article Text

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Issue

Vol. 101, Iss. 5 — May 2020

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