Abstract
The antiferromagnetic to valence-bond-solid phase transition in the two-dimensional model (an Heisenberg model with four-spin interactions) is studied using large-scale quantum Monte Carlo simulations. The results support a continuous transition of the ground state, in agreement with the theory of “deconfined” quantum criticality. There are, however, large corrections to scaling, of logarithmic or very slowly decaying power-law form, which had not been anticipated. This suggests that either the symmetric noncompact field theory for deconfined quantum criticality has to be revised or that the theory for (as in the system studied here) differs significantly from (where the field theory is analytically tractable).
- Received 25 January 2010
DOI:https://doi.org/10.1103/PhysRevLett.104.177201
©2010 American Physical Society
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