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Evolution of magnetic Dirac bosons in a honeycomb lattice
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Los Alamos National Laboratory, United States.
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 1, article id 014433Article in journal (Refereed) Published
Abstract [en]

We examine the presence and evolution of magnetic Dirac nodes in the Heisenberg honeycomb lattice. Using linear spin theory, we evaluate the collinear phase diagram as well as the change in the spin dynamics with various exchange interactions. We show that the ferromagnetic structure produces bosonic Dirac and Weyl points due to the competition between the interactions. Furthermore, it is shown that the criteria for magnetic Dirac nodes are coupled to the magnetic structure and not the overall crystal symmetry, where the breaking of inversion symmetry greatly affects the antiferromagnetic configurations. The tunability of the nodal points through variation of the exchange parameters leads to the possibility of controlling Dirac symmetries through an external manipulation of the orbital interactions.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 1, article id 014433
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-222296DOI: 10.1103/PhysRevB.97.014433Scopus ID: 2-s2.0-85041100073OAI: oai:DiVA.org:kth-222296DiVA, id: diva2:1180642
Note

QC 20180206

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-06Bibliographically approved

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