Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-10-21
Phys. Rev. B 83, 024413 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
20 pages,15 figures
Scientific paper
10.1103/PhysRevB.83.024413
The orthogonal dimer structure in the SrCu2(BO3)2 spin-1/2 magnet provides a realization of the Shastry-Sutherland model. Using a dimer-product variational wave function, we map out the phase diagram of the Shastry-Sutherland model including anisotropies. Based on the variational solution, we construct a bond-wave approach to obtain the excitation spectra as a function of magnetic field. The characteristic features of the experimentally measured neutron and ESR spectra are reproduced, like the anisotropy induced zero field splittings and the persistent gap at higher fields.
Penc Karlo
Romhányi Judit
Totsuka Keisuke
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