English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Order by disorder in classical kagome antiferromagnets with chiral interactions

MPS-Authors
/persons/resource/persons145694

Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

/persons/resource/persons189444

Shtengel,  Kirill
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Pitts, J., Buessen, F. L., Moessner, R., Trebst, S., & Shtengel, K. (2022). Order by disorder in classical kagome antiferromagnets with chiral interactions. Physical Review Research, 4(4): 043019. doi:10.1103/PhysRevResearch.4.043019.


Cite as: https://hdl.handle.net/21.11116/0000-000C-3FCE-7
Abstract
The Heisenberg antiferromagnet on the kagome lattice is an archetypal instance of how large ground-state degeneracies arise, and how they may get resolved by thermal and quantum fluctuations. Augmenting the Heisenberg model by chiral spin interactions has proved to be of particular interest in the discovery of certain chiral quantum spin liquids. Here we consider the classical variant of this chiral kagome model and find that it exhibits, similar to the classical Heisenberg antiferromagnet, a remarkably large and structured ground-state manifold, which combines continuous and discrete degrees of freedom. This allows for a rich set of order-by-disorder phenomena. Degeneracy lifting occurs in a highly selective way, choosing already at the harmonic level specific triaxial states, which however retain an emergent Z2 degree of freedom (absent in the conventional Heisenberg model). We also study the competition of entropic and energetic ground-state selection as the model interpolates between the purely chiral and Heisenberg cases. For this mixed model, we find a "proximate ordered-by-disorder" finite-temperature regime where fluctuations overcome the energetic ground-state preference of the perturbation. Finally, a semiclassical route to a spin liquid is provided by quantum order by disorder in the purely chiral models, where the aforementioned Z2 degrees of freedom are elevated to the role of an emergent gauge field.