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
- 98Citations
- 31Captures
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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.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84892908795&origin=inward; http://dx.doi.org/10.1103/physrevb.89.020407; https://link.aps.org/doi/10.1103/PhysRevB.89.020407; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.89.020407/fulltext; http://link.aps.org/article/10.1103/PhysRevB.89.020407
American Physical Society (APS)
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