Kavli Affiliate: Yi Zhou
| First 5 Authors: Rong-Yang Sun, Hui-Ke Jin, Hong-Hao Tu, Yi Zhou,
| Summary:
The nature of the ground state for the $S = 1/2$ kagome Heisenberg
antiferromagnet (KHAF) has been elusive. We revisit this challenging problem
and provide numerical evidence that its ground state might be a chiral spin
liquid. Combining the density matrix renormalization group method and
analytical analyses, we demonstrate that the previously observed chiral spin
liquid phase in the KHAF with longer-range couplings is stable in a broader
region. We characterize the nature of the ground state by computing energy
derivatives, revealing ground-state degeneracy arising from spontaneous
breaking of time-reversal symmetry, and targeting the semion sector. We further
investigate the phase diagram in the vicinity of the KHAF and observe a
$sqrt{3}timessqrt{3}$ magnetically ordered phase and two valence-bond
crystal phases.
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