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Article Dans Une Revue Physical Review Letters Année : 2013

Néel-state to valence-bond solid transition on the honeycomb lattice: Evidence for deconfined criticality

Résumé

We study a spin-1/2 SU(2) model on the honeycomb lattice with nearest-neighbor antiferromagnetic exchange $J$ that favors Néel order, and competing 6-spin interactions $Q$ which favor a valence bond solid (VBS) state in which the bond-energies order at the "columnar" wavevector ${\mathbf K} = (2\pi/3,-2\pi/3)$. We present quantum Monte-Carlo evidence for a direct continuous quantum phase transition between Néel and VBS states, with exponents and logarithmic violations of scaling consistent with those at analogous deconfined critical points on the square lattice. Although this strongly suggests a description in terms of deconfined criticality, the measured three-fold anisotropy of the phase of the VBS order parameter shows unusual near-marginal behaviour at the critical point.

Dates et versions

hal-00856533 , version 1 (01-09-2013)

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Sumiran Pujari, Kedar Damle, Fabien Alet. Néel-state to valence-bond solid transition on the honeycomb lattice: Evidence for deconfined criticality. Physical Review Letters, 2013, 111, pp.087203. ⟨10.1103/PhysRevLett.111.087203⟩. ⟨hal-00856533⟩
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