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Phys. Rev. Lett. 100, 017203 (2008) [4 pages]

Scaling in the Fan of an Unconventional Quantum Critical Point

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Roger G. Melko1,2 and Ribhu K. Kaul3
1Department of Physics and Astronomy, University of Waterloo, Ontario, N2L 3G1, Canada
2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge Tennessee, 37831, USA
3Department of Physics, Harvard University, Cambridge Massachusetts, 02138, USA

Received 23 July 2007; revised 8 October 2007; published 8 January 2008

We present results of extensive finite-temperature quantum Monte Carlo simulations on a SU(2) symmetric S=1/2 quantum antiferromagnet with four-spin interaction [ A. W. 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 1.6×104 spins, indicate that the four-spin interaction destroys the Néel 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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.017203
DOI:
10.1103/PhysRevLett.100.017203
PACS:
75.40.Mg, 75.40.Cx
 
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