Quantum Monte Carlo simulations locate a continuous boundary phase transition at Q_c=0.310(11) from AF to VBS order in a quantum critical Heisenberg model with dangling chain, yielding exponents y_s=0.81(4), Δ_s=0.660(15), Δ_v=0.204(14).
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Hopf terms govern phases in 2D metals near fluctuating magnetic and spin loop-current orders, realizing an SU(2)-protected topological phase with gapped bulk, chiral edges, and quantized spin-Hall conductance.
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Deconfined Boundary Phase Transition of a Quantum Critical Heisenberg Model
Quantum Monte Carlo simulations locate a continuous boundary phase transition at Q_c=0.310(11) from AF to VBS order in a quantum critical Heisenberg model with dangling chain, yielding exponents y_s=0.81(4), Δ_s=0.660(15), Δ_v=0.204(14).
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Hopf symmetry protected topological phases in the vicinity of spin orders
Hopf terms govern phases in 2D metals near fluctuating magnetic and spin loop-current orders, realizing an SU(2)-protected topological phase with gapped bulk, chiral edges, and quantized spin-Hall conductance.