Variational Monte Carlo Study of the 1/9 Magnetization Plateau in Kagome Antiferromagnets

Abstract

Motivated by very recent experimental observations of the 1/9 magnetization plateaus in YCu${}_3$(OH)${}_{6+x}$Br${}_{3-x}$ and YCu${}_3$(OD)${}_{6+x}$Br${}_{3-x}$, our study delves into the magnetic field-induced phase transitions in the nearest-neighbor antiferromagnetic Heisenberg model on the kagome lattice using the variational Monte Carlo technique. We uncover a phase transition from a zero-field Dirac spin liquid to a field-induced magnetically disordered phase that exhibits the 1/9 magnetization plateau. Through a comprehensive analysis encompassing the magnetization distribution, spin correlations, chiral order parameter, topological entanglement entropy, ground-state degeneracy, Chern number and excitation spectrum, we pinpoint the phase associated with this magnetization plateau as a chiral ${\mathbb{Z}}_3$ topological quantum spin liquid and elucidate its diverse physical properties.

arXiv commentAccepted by Phys. Rev. Lett

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Cited by in corpus (11)

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• Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet
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