Nonequilibrium selection of magnetic order in driven triangular XY antiferromagnet

Abstract

We show that a weak periodic drive removes the accidental degeneracy in the ground state of the XY antiferromagnet on the triangular lattice in a uniform static magnetic field. The underlying mechanism involves adding a small periodically modulated component to the magnetic field, which influences finite-frequency modes to generate an effective potential for the accidental pseudo-Goldstone mode. This selection can be arranged to compete with the degeneracy lifting via the thermal order by disorder mechanism. This yields a non-equilibrium phase transition as the relative strength of the two mechanisms is tuned by varying temperature. This proposal may be amenable to experimental realization, in particular as applying the field is noninvasive, and no complex bath engineering is required.

10 pages, 4 figures; minor revisions

References in corpus (7)

• Accurate sampling using Langevin dynamics
• Direct transition from a disordered to a multiferroic phase on a triangular lattice
• Probing and controlling spin chirality in Mott insulators by circularly polarized laser
• Magnetic phase diagrams of classical triangular and kagome antiferromagnets
• Magnetic phase diagram, critical behaviour and 2D-3D crossover in a triangular lattice antiferromagnet RbFe(MoO4)2
• Order by quenched disorder in the model triangular antiferromagnet RbFe(MoO4)2
• Control of effective free energy landscape in a frustrated magnet by a field pulse

Cited by in corpus (4)

• Prethermal time-crystalline spin ice and monopole confinement in a driven magnet
• Space-time symmetry breaking in nonequilibrium frustrated magnetism
• Anticollinear order and degeneracy lifting in square lattice antiferromagnet LaSrCrO4
• Transient selection of competing order in frustrated spin Peierls systems after a quench