Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W56: Quantum Spin Liquids, Theory II
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 304
Sponsoring
Unit:
GMAG
Chair: Martin Mourigal, Georgia Tech
Abstract: W56.00007 : Emergent symmetry and fractionalized Goldstone modes in a bilayer quantum spin liquid
4:12 PM–4:24 PM
Presenter:
Aayush Vijayvargia
(Arizona State University)
Authors:
Aayush Vijayvargia
(Arizona State University)
Emilian M Nica
(Arizona State University)
Yuan-Ming Lu
(Ohio State Univ - Columbus)
Onur Erten
(Arizona State University)
on a square lattice. I will show that the low energy model is described by a π-flux Hubbard model
with an enhanced SO(4) symmetry. The antiferromagnetic Mott transition induced by interlayer
interactions in the Hubbard model amounts to a magnetic fragmentation transition for the original
degrees of freedom where a fluctuating non-local in-plane order coexists with an out-of-plane local
magnetization. The corresponding topological order is characterized by Z2 × Z2 if the Neel order is
along the z direction and Z2 otherwise. I will benchmark these results with a perturbative analysis.
I will elucidate on the low energy collective excitations of these phases and show that the Goldstone boson of the Z2 × Z2 phase is fractionalized and nonlocal.
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