Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session D46: Spin Liquids: Theory and Experiment
2:30 PM–5:30 PM,
Monday, March 2, 2020
Room: 708
Sponsoring
Units:
GMAG DMP
Chair: Martin Mourigal, Georgia Inst of Tech
Abstract: D46.00001 : Collective excitations of a magnetized U(1) spin liquid.*
Presenter:
Oleg Starykh
(University of Utah)
Author:
Oleg Starykh
(University of Utah)
In this talk, I focus on the prominent metal-like magnetic insulators – U(1) quantum spin liquids with spinon Fermi surface – excitations of which are represented by neutral spin-1/2 fermions (spinons) and emergent gauge fields. The gauge field mediates strong interactions between spinons. We argue that the full effect of this interaction becomes apparent when the spin liquid is partially magnetized by the Zeeman magnetic field. Under this condition, the spectrum of the spin liquid acquires a new transverse collective spin-1 mode, distinct from incoherent particle-hole excitations of the spinon continuum. Despite being located outside the spinon continuum, this novel collective excitation interacts with emergent gauge fluctuations which are responsible for partially damping it.
I will also discuss how this picture is modified by the spin-orbit interaction, and present a calculation of the ESR linewidth for one specific spin-orbit geometry.
*This research is supported by the NSF CMMT program under Grant No. DMR1928919.
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