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"Order by disorder in classical kagome antiferromagnets with chiral interactions"


Kiril Shtengel , University of California, Riverside
[Host: Israel Klich ]
ABSTRACT:

The Heisenberg antiferromagnet on the kagome lattice is an archetypal example 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 chiral quantum spin liquids. I will focus on the classical variant of this chiral kagome model, which exhibits, similar to the classical Heisenberg antiferromagnet, a remarkably large and structured ground-state manifold combining continuous and discrete degrees of freedom. This allows for a rich set of order-by-disorder phenomena. Degeneracy lifting by thermal and quantum fluctuations occurs in a highly selective way that, among other interesting effects, provides a semiclassical route to an emergent Z_2 spin liquid. 

Condensed Matter Seminar
Thursday, December 1, 2022
3:30 PM
Monroe Hall, Room 124

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