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Competing Spin Liquid Phases in the S=$\frac{1}{2}$ Heisenberg Model on the Kagome Lattice

by Shenghan Jiang, Panjin Kim, Jung Hoon Han, Ying Ran

This Submission thread is now published as

Submission summary

Authors (as registered SciPost users): Shenghan Jiang
Submission information
Preprint Link:  (pdf)
Date accepted: 2019-07-02
Date submitted: 2019-06-12 02:00
Submitted by: Jiang, Shenghan
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Condensed Matter Physics - Theory
  • Condensed Matter Physics - Computational
Approaches: Theoretical, Computational


The properties of ground state of spin-$\frac{1}{2}$ kagome antiferromagnetic Heisenberg (KAFH) model have attracted considerable interest in the past few decades, and recent numerical simulations reported a spin liquid phase. The nature of the spin liquid phase remains unclear. For instance, the interplay between symmetries and $Z_2$ topological order leads to different types of $Z_2$ spin liquid phases. In this paper, we develop a numerical simulation method based on symmetric projected entangled-pair states (PEPS), which is generally applicable to strongly correlated model systems in two spatial dimensions. We then apply this method to study the nature of the ground state of the KAFH model. Our results are consistent with that the ground state is a $U(1)$ Dirac spin liquid rather than a $Z_2$ spin liquid.

Author comments upon resubmission

We have made the requested modifications. We list the fitting parameters for energies(exponent) on Fig. 4. We also add an appendix to do robustness analysis for the two zero-flux states. The fitting for zero-flux I phase is more reliable given the almost energy convergence at large D_cut. For zero-flux II phase, we present another fitting scheme, which gives consistent energies at infinite D_cut.

List of changes

1. add fitting parameters on Fig. 4
2. add another appendix performing robustness analysis.

Published as SciPost Phys. 7, 006 (2019)

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