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Vanishing spin gap in a competing spin-liquid phase in the kagome Heisenberg antiferromagnet

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1098-0121, Vol: 89, Issue: 2
2014
  • 98
    Citations
  • 0
    Usage
  • 31
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    98
    • Citation Indexes
      98
  • Captures
    31

Article Description

We provide strong numerical evidence, using improved variational wave functions, for a ground state with vanishing spin gap in the spin-1/2 quantum Heisenberg model on the kagome lattice. Starting from the algebraic U(1) Dirac spin liquid state proposed by Ran et al. [Phys. Rev. Lett. 98, 117205 (2007)PRLTAO0031-900710.1103/PhysRevLett.98.117205] and iteratively applying a few Lanczos steps, we compute the lowest S=2 excitation constructed by exciting spinons close to the Dirac nodes. Our results are compatible with a vanishing spin gap in the thermodynamic limit and in consonance with a power-law decay of long distance spin-spin correlations in real space. The competition with a gapped (topological) spin liquid is discussed. © 2014 American Physical Society.

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