Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Correlated Magnetism – Spin Liquids

TT 33.10: Talk

Wednesday, March 19, 2025, 17:45–18:00, H33

Frustrated multipolar degrees of freedom: The quadrupolar Kitaev model — •Partha Sarker and Urban Friedrich Peter Seifert — Institute for Theoretical Physics, University of Cologne, Zülpicher Straße 77, D-50937 Köln

Frustrated multipolar exchange interactions between spin-S local moments (S > 1/2) have been suggested to possibly give rise to quantum spin liquid-like ground states featuring an emergent gauge structure and fractionalized excitations. However, only little is known about characteristic features and experimental signatures of such "multipolar spin liquids". To this end, in this work we turn to the "Quadrupolar Kitaev model" of S=1 moments on a honeycomb lattice as a drosophila, for which recent numerical studies have found a deconfined ground state with topological order. As the model, similar to the spin-S generalization of the Kitaev honeycomb model, is not exactly solvable, we use a combination of mean-field theory and exact symmetry analysis to investigate competing ground states, including multipolar liquids, and their (fractionalized) excitations.

Keywords: Kitaev Model; Frustrated Magnetism; Quantum Spin Liquids