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arxiv: 0707.2961 · v2 · submitted 2007-07-19 · ❄️ cond-mat.str-el

Scaling in the Fan of an Unconventional Quantum Critical Point

Roger G. Melko , Ribhu K. Kaul This is my paper
classification ❄️ cond-mat.str-el
keywords quantumcriticalfour-spininteractionpointresultssimulationsunconventional
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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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