Journal
PHYSICAL REVIEW B
Volume 91, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.041124
Keywords
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Funding
- National Science Foundation [DMR-1408560, DMR-1205734]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG02-06ER46305]
- SITP
- PRIN
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1408560] Funding Source: National Science Foundation
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We investigate the extended Heisenberg model on the kagome lattice by using Gutzwiller projected fermionic states and the variational Monte Carlo technique. In particular, when both second- and third-neighbor superexchanges are considered, we find that a gapped spin liquid described by nontrivial magnetic fluxes and long-range chiral-chiral correlations is energetically favored compared to the gapless U(1) Dirac state. Furthermore, the topological Chern number, obtained by integrating the Berry curvature, and the degeneracy of the ground state, by constructing linearly independent states, lead us to identify this flux state as the chiral spin liquid with a C = 1/2 fractionalized Chern number.
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