Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu${}_2$(BO${}_3$)${}_2$ doped with nonmagnetic impurities

Abstract

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.

arXiv commentslightly extended published version; 6 pages, 5 figures

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Cited by in corpus (4)

• Correlated decay of triplet excitations in the Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)${}_2$
• Emergent Bound States and Impurity Pairs in Chemically Doped Shastry-Sutherland System
• Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet
• Real Space Imaging of Spin Polarons in Zn Doped SrCu2(BO3)2