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Accueil du site > Publications > Publications 2009 > Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu2(BO3)2 doped with nonmagnetic impurities

Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu2(BO3)2 doped with nonmagnetic impurities

S. Capponi, D. Poilblanc, F. Mila

par Sylvain Capponi - 26 février 2009

Controlled doping of SrCu_2(BO_3)_2, a faithful realization of the Heisenberg spin-1/2 antiferromagnet on the Shastry-Sutherland lattice, with non-magnetic impurities generates bound-states below the spin gap. These bound-states and their symmetry properties are investigated by exact diagonalisation of small clusters and within a simple effective model describing a spinon submitted to an attractive extended potential. It is shown that Raman spectroscopy is a unique technique to probe these bound-states. Quantitative theoretical Raman spectra are numerically obtained.