Classical ${\mathbb{Z}}_2$ spin liquid on the generalized four-color Kitaev model

Abstract

While $U$(1) spin liquids have been extensively studied in both quantum and classical regimes, exact classical ${\mathbb{Z}}_2$ spin liquids arising from models with nearest-neighbor, bilinear spin interactions are still rare. In this Letter, we explore the four-color Kitaev model as a minimal model for stabilizing classical ${\mathbb{Z}}_2$ spin liquids across a broad family of tricoordinated lattices. By formulating a ${\mathbb{Z}}_2$ lattice gauge theory, we identify this spin liquid as being described by an emergent Gauss's law with effective charge-2 condensation, and deconfined fractionalized bond-charge excitations. We complement our findings with Monte Carlo simulations, revealing a crossover from a high-temperature paramagnet to a low-temperature liquid phase characterized by residual entropy, classical ${\mathbb{Z}}_2$ flux order, and diffuse spin structure factors.

7 pages, 4 figures

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Cited by in corpus (1)

• The spin-orbital Kitaev model: from kagome spin ice to classical fractons