Scaling in the Fan of an Unconventional Quantum Critical Point

Details Scaling in the Fan of an Unconventional Quantum Critical Point Scaling in the Fan of an Unconventional Quantum Critical Point

2007-07-19

arxiv.org/abs/0707.2961v2

Phys. Rev. Lett. 100, 017203 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

published version, minor changes

Scientific paper

10.1103/PhysRevLett.100.017203

We present results of extensive finite-temperature Quantum Monte Carlo simulations on a SU(2) symmetric S=1/2 quantum antiferromagnet with a four-spin interaction [Sandvik, Phys. Rev. Lett. 98, 227202 (2007)]. Our simulations, which are free of the sign-problem and carried out on lattices containing in excess of 1.6 X 10^4 spins, indicate that the four-spin interaction destroys the N\'eel order at an unconventional z=1 quantum critical point, producing a valence-bond solid paramagnet. Our results are consistent with the `deconfined quantum criticality' scenario.

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