Phys. Rev. Lett. 87, 097203 (2001) [4 pages]Magnetization Plateaus of SrCu2(BO3)2 from a Chern-Simons TheoryReceived 21 February 2001; published 13 August 2001 The antiferromagnetic Heisenberg model on the frustrated Shastry-Sutherland lattice is studied by a mapping onto spinless fermions carrying one quantum of statistical flux. Using a mean-field approximation these fermions populate the bands of a generalized Hofstadter problem. Their filling leads to the magnetization curve. For SrCu2(BO3)2 we reproduce plateaus at 1/3 and 1/4 of the saturation moment and predict a new one at 1/2. Gaussian fluctuations of the gauge field are shown to be massive at these plateau values. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.097203
DOI:
10.1103/PhysRevLett.87.097203
PACS:
75.10.Jm, 73.21.-b, 75.40.Cx, 75.50.Ee
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