Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T43: Topological Antiferromagnets and Altermagnets
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 317
Sponsoring
Unit:
DMP
Chair: Yuhang Li, University of California, Riverside
Abstract: T43.00014 : Nontrivial triplet band-topology in the spin gap materials, KCuCl3 and TlCuCl3 (Part 2)*
2:06 PM–2:18 PM
Presenter:
Matthew S Stern
(University of California, Irvine)
Authors:
Matthew S Stern
(University of California, Irvine)
Charles B Walker
(University of California, Irvine)
Judit Romhanyi
(University of California, Irvine)
We extend this picture including symmetry allowed anisotropy terms and magnetic field and investigate their effects on the band-topology. Inversion symmetry excludes the intra-dimer antisymmetric exchange anisotropy preventing the mixing of singlets and triplets and limiting the variety of nontrivial band-topology. Nonetheless, inter-dimer anisotropies lead to nontrivial topology within the Sz subspaces. We find triplet bands analogous to nodal-line semimetals, Weyl semimetals, and Chern insulators depending on which anisotropy is finite. We perform detailed symmetry analysis to characterize the various band-topologies and determine corresponding topological invariants.
[1] T. Kato et al, J. Phys. Soc. Jpn. 67, pp. 752-754 (1998), N. Cavadini et al, Physica B 276-278, 540 542 (2000), N. Cavadini et al, Phys. Rev. B 63, 172414 (2001), A. Oosawa et al, Phys. Rev. B 65, 094426 (2002)
[2] H.Tanaka et al Physica B 246–247, 545(1998), M. Motokawa et al J. Phys. Soc. Jpn. 72, 1-11 (2003), S. Kimura et al Physica B 346–347, 15–18 (2004).
*Supported by the NSF through grant DMR-2142554
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