Abstract
The defining problem in frustrated quantum magnetism, the ground state of the nearest-neighbor antiferromagnetic Heisenberg model on the kagome lattice, has defied all theoretical and numerical methods employed to date. We apply the formalism of tensor-network states, specifically the method of projected entangled simplex states, which combines infinite system size with a correct accounting for multipartite entanglement. By studying the ground-state energy, the finite magnetic order appearing at finite tensor bond dimensions, and the effects of a next-nearest-neighbor coupling, we demonstrate that the ground state is a gapless spin liquid. We discuss the comparison with other numerical studies and the physical interpretation of this result.
- Received 26 December 2016
DOI:https://doi.org/10.1103/PhysRevLett.118.137202
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Closing in on the Kagome Magnet
Published 29 March 2017
A numerical analysis suggests that the elusive ground state of the antiferromagnetic Heisenberg model for the kagome lattice is a gapless spin liquid.
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