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Condensed Matter > Strongly Correlated Electrons

Title: Two-Dimensional Dirac Nodal-Loop Magnons in Collinear Antiferromagnets

Authors: S. A. Owerre
Abstract: We study the nontrivial magnon band crossings in the collinear antiferromagnets on the two-dimensional (2D) CaVO lattice. It is shown that the combination of space-inversion and time-reversal symmetry ($\mathcal{PT}$-symmetry) leads to doubly-degenerate eight magnon branches, which cross each other along a one-dimensional loop in the 2D Brillouin zone. We show that the Dirac nodal-loops (DNLs) are not present in the collinear ferromagnet on this lattice. Thus, the current 2D antiferromagnetic DNLs are symmetry-protected and they provide a novel platform to search for their analogs in 2D electronic antiferromagnetic systems.
Comments: 4 pages, 3 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:1803.06349 [cond-mat.str-el]
  (or arXiv:1803.06349v1 [cond-mat.str-el] for this version)

Submission history

From: Solomon Akaraka Owerre [view email]
[v1] Fri, 16 Mar 2018 18:00:02 GMT (397kb,D)