Quantum order by disorder in a spin-one frustrated magnet on the kagome lattice

Details Quantum order by disorder in a spin-one frustrated magnet on the kagome lattice Quantum order by disorder in a spin-one frustrated magnet on the kagome lattice

2008-05-14

arxiv.org/abs/0805.2075v1

Phys. Rev. B 79, 094408 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 12 figures

Scientific paper

10.1103/PhysRevB.79.094408

We study the XXZ spin-one quantum magnet on the kagome lattice as an example where quantum fluctuations on highly degenerate classical ground states lead to various exotic quantum ground states. Previous studies have predicted several quantum phases, but different analytical approaches do not necessarily lead to the same physical picture. In this work, we use Quantum Monte Carlo computations to critically examine some of the predictions made in the string-net mean-field theory and the degenerate perturbation theory combined with duality analysis and effective field theory. It is found that the resulting phase diagram differs from some of the previous predictions. Further implications of our results to different analytical approaches are discussed.

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