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Title: Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets

Abstract

We study periodically driven insulating noncollinear stacked kagome antiferromagnets with a conventional symmetry-protected three-dimensional (3D) in-plane 120° spin structure, with either positive or negative vector chirality. We show that the symmetry protection of the in-plane 120° spin structure can be broken in the presence of an off-resonant circularly or linearly polarized electric field propagating parallel to the in-plane 120° spin structure (say along the x direction). Consequently, topological Floquet Weyl magnon nodes with opposite chirality are photoinduced along the k{sub x} momentum direction. They manifest as the monopoles of the photoinduced Berry curvature. We also show that the system exhibits a photoinduced magnon thermal Hall effect for circularly polarized electric field. Furthermore, we show that the photoinduced chiral spin structure is a canted 3D in-plane 120° spin structure, which was recently observed in the equilibrium noncollinear antiferromagnetic Weyl semimetals Mn{sub 3}Sn/Ge. Our result not only paves the way towards the experimental realization of Weyl magnons and photoinduced thermal Hall effects, but also provides a powerful mechanism for manipulating the intrinsic properties of 3D topological antiferromagnets.

Authors:
 [1]
  1. Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, Ontario, N2L 2Y5 (Canada)
Publication Date:
OSTI Identifier:
22852319
Resource Type:
Journal Article
Journal Name:
Annals of Physics
Additional Journal Information:
Journal Volume: 406; Other Information: © 2019 Elsevier Inc. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-4916
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; CHIRALITY; ELECTRIC FIELDS; HALL EFFECT; MAGNONS; MONOPOLES; SEMIMETALS; SPIN; THREE-DIMENSIONAL CALCULATIONS; THREE-DIMENSIONAL LATTICES

Citation Formats

Owerre, S.A., E-mail: sowerre@perimeterinstitute.ca. Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets. United States: N. p., 2019. Web. doi:10.1016/J.AOP.2019.04.003.
Owerre, S.A., E-mail: sowerre@perimeterinstitute.ca. Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets. United States. https://doi.org/10.1016/J.AOP.2019.04.003
Owerre, S.A., E-mail: sowerre@perimeterinstitute.ca. 2019. "Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets". United States. https://doi.org/10.1016/J.AOP.2019.04.003.
@article{osti_22852319,
title = {Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets},
author = {Owerre, S.A., E-mail: sowerre@perimeterinstitute.ca},
abstractNote = {We study periodically driven insulating noncollinear stacked kagome antiferromagnets with a conventional symmetry-protected three-dimensional (3D) in-plane 120° spin structure, with either positive or negative vector chirality. We show that the symmetry protection of the in-plane 120° spin structure can be broken in the presence of an off-resonant circularly or linearly polarized electric field propagating parallel to the in-plane 120° spin structure (say along the x direction). Consequently, topological Floquet Weyl magnon nodes with opposite chirality are photoinduced along the k{sub x} momentum direction. They manifest as the monopoles of the photoinduced Berry curvature. We also show that the system exhibits a photoinduced magnon thermal Hall effect for circularly polarized electric field. Furthermore, we show that the photoinduced chiral spin structure is a canted 3D in-plane 120° spin structure, which was recently observed in the equilibrium noncollinear antiferromagnetic Weyl semimetals Mn{sub 3}Sn/Ge. Our result not only paves the way towards the experimental realization of Weyl magnons and photoinduced thermal Hall effects, but also provides a powerful mechanism for manipulating the intrinsic properties of 3D topological antiferromagnets.},
doi = {10.1016/J.AOP.2019.04.003},
url = {https://www.osti.gov/biblio/22852319}, journal = {Annals of Physics},
issn = {0003-4916},
number = ,
volume = 406,
place = {United States},
year = {Mon Jul 15 00:00:00 EDT 2019},
month = {Mon Jul 15 00:00:00 EDT 2019}
}