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Phys. Rev. B 78, 184418 (2008) [11 pages]

Mechanisms for spin supersolidity in S=1/2 spin-dimer antiferromagnets

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J.-D. Picon1,2, A. F. Albuquerque1,3, K. P. Schmidt4, N. Laflorencie5, M. Troyer1, and F. Mila2
1Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland
2Institute of Theoretical Physics, EPF Lausanne, 1015 Lausanne, Switzerland
3School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia
4Lehrstuhl für Theoretische Physik I, TU Dortmund, Otto-Hahn-Straße 4, D-44221 Dortmund, Germany
5Laboratoire de Physique des Solides, Université Paris-Sud, UMR-8502 CNRS, 91405 Orsay, France

Received 31 July 2008; revised 15 October 2008; published 17 November 2008

Using perturbative expansions and the contractor renormalization (CORE) algorithm, we obtain effective hard-core bosonic Hamiltonians describing the low-energy physics of S=1/2 spin-dimer antiferromagnets known to display supersolid phases under an applied magnetic field. The resulting effective models are investigated by means of mean-field analysis and quantum Monte Carlo simulations. A “leapfrog mechanism,” through means of which extra singlets delocalize in a checkerboard-solid environment via correlated hoppings, is unveiled that accounts for the supersolid behavior.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.184418
DOI:
10.1103/PhysRevB.78.184418
PACS:
03.75.Nt, 05.30.Jp, 75.10.Jm, 75.40.Mg
 
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