Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J39: Spin Liquid II
3:00 PM–6:00 PM,
Tuesday, March 16, 2021
Sponsoring
Units:
GMAG DMP
Chair: Martin Mourigal, Georgia Inst of Tech
Abstract: J39.00004 : Band topology of magnetic excitations in anisotropic quantum magnets
4:00 PM–4:36 PM
Live
Presenter:
Judit Romhanyi
(University of California, Irvine)
Authors:
Judit Romhanyi
(University of California, Irvine)
Andreas Thomasen
(Okinawa Institute of Science and Technology Graduate University (OIST))
Nicholas Shannon
(Okinawa Institute of Science and Technology Graduate University (OIST))
Karlo Penc
(Wigner Research Centre for Physics)
Z2 bands formed by magnetic excitations have been studied in bilayer honeycomb and kagome models involving magnons[1] and triplons[2]. In these models, the magnetic excitations form time-reversal (TR) partners, which play the role of the Kramers pairs of electrons in the model of Kane and Mele. However, bosonic excitations do not enjoy the same symmetry-protection as Kramers pairs of electrons and can be mixed by interactions. The consequences of such mixing for the Z2 topological phases of a quantum paramagnet remains an open question.
We show that a symmetric-exchange anisotropy, allowed by the symmetries of most bilayer models, can destroy the Z2 topology. We investigate possible symmetries that can provide an analog to the TR symmetry protecting the Kramers doublets in the case of electron bands.
Furthermore, we examine the TR-breaking case and the formation of Chern bands. We focus on the multipolar characters of the topological bands formed by spin-multiplet excitations[3].
[1] H. Kondo, Y. Akagi, and H. Katsura, Phys. Rev. B 99, 041110 (2019)
[2] D. G. Joshi and A. P. Schnyder, Physical Review B 100, 020407 (2019)
[3] J. Romhányi Phys. Rev. B 99, 014408 (2019)
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