Theory of Magnetization Plateaux in the Shastry-Sutherland Model
Abstract
Motivated by the remarkable properties of SrCu2(BO3)2 in a magnetic field, we use perturbative continuous unitary transformations to determine the magnetization plateaux of the Shastry-Sutherland model, unveiling an unexpected sequence of plateaux progressively appearing at 2/9, 1/6, 1/9, and 2/15 upon increasing the interdimer coupling. We predict that a 1/6 plateau should be present in SrCu2(BO3)2, even if residual interactions beyond the Shastry-Sutherland are strong enough to modify the other plateaux below 1/3. The method is extended to calculate the magnetization profile within the plateaux, leading to a local structure around triplons that agrees with NMR results on SrCu2(BO3)2.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2008
- DOI:
- 10.1103/PhysRevLett.101.250402
- arXiv:
- arXiv:0806.3406
- Bibcode:
- 2008PhRvL.101y0402D
- Keywords:
-
- 05.30.Jp;
- 03.75.Hh;
- 03.75.Kk;
- 03.75.Lm;
- Boson systems;
- Static properties of condensates;
- thermodynamical statistical and structural properties;
- Dynamic properties of condensates;
- collective and hydrodynamic excitations superfluid flow;
- Tunneling Josephson effect Bose-Einstein condensates in periodic potentials solitons vortices and topological excitations;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, 6 figures