Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W17: Topological Materials and Platforms
3:00 PM–5:48 PM,
Thursday, March 7, 2024
Room: M100H
Sponsoring
Unit:
DCMP
Chair: Qunfei Zhou, University of Kansas
Abstract: W17.00012 : Nontrivial triplet band-topology in the spin gap materials, KCuCl3 and TlCuCl3*
5:12 PM–5:24 PM
Presenter:
Charles B Walker
(University of California, Irvine)
Authors:
Charles B Walker
(University of California, Irvine)
Judit Romhanyi
(University of California, Irvine)
Collaboration:
Charles Walker, Judit Romhanyi, Matthew Stern
We use symmetry arguments to extend the previously suggested Heisenberg model with possible anisotropies, such as the antisymmetric Dzyaloshinskii-Moriya (DM) interaction, and produce an effective triplet Hamiltonian to study the triplet spectra. Depending on the strength of the magnetic anisotropies and the direction of the external magnetic field, we find triplet analogs of Weyl semimetals and nodal line semimetals. We categorize the topological structure of the spectrum in all configurations of external fields and allowed symmetry terms. This result may indicate that the bands of the triplet excitation may carry finite Berry curvature and display nontrivial band-topology
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[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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