Spin-charge separation in 1D fermions enables partially gapped deconfined quantum critical points between locally ordered phases, inferred via field theory and supported by numerical analysis of a microscopic model.
Deconfined quantum criticality and emergent SO(5) symmetry in fermionic systems
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abstract
Deconfined quantum criticality with emergent SO(5) symmetry in correlated systems remains elusive. Here, by performing numerically-exact state-of-the-art quantum Monte Carlo (QMC) simulations, we show convincing evidences of deconfined quantum critical points (DQCP) between antiferromagnetic and valence-bond-solid phases in the extended Hubbard model of fermions on the honeycomb lattice with large system sizes. We further demonstrate evidences of the SO(5) symmetry at the DQCP. It is important to note that the critical exponents obtained by finite-size scaling at the DQCP here are consistent with the rigourous conformal bounds. Consequently, we established a promising arena of DQCP with emergent SO(5) symmetry in interacting systems of fermions. Its possible experimental relevances in correlated systems of Dirac fermions will be discussed briefly.
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Deconfined criticality in a 1D lattice model is shown to be an intrinsically gapless topological state whose mixed anomaly enforces robust edge modes without gapped counterparts.
citing papers explorer
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Deconfined quantum critical points in fermionic systems with spin-charge separation
Spin-charge separation in 1D fermions enables partially gapped deconfined quantum critical points between locally ordered phases, inferred via field theory and supported by numerical analysis of a microscopic model.
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Deconfined criticality as intrinsically gapless topological state in one dimension
Deconfined criticality in a 1D lattice model is shown to be an intrinsically gapless topological state whose mixed anomaly enforces robust edge modes without gapped counterparts.