Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-05-19
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 8 figures
Scientific paper
In a recent work [Phys. Rev. B {\bf77}, 014419 (2008)], a quantum spin-1/2 model having an exact fourfold degenerate Shastry-Sutherland ground state was constructed, and studied using finite-size numerical exact diagonalization. There, a schematic quantum phase diagram suggesting many competing phases was also proposed. In the present work, this model is investigated using the dimer and plaquette triplon mean-field theories. The corresponding quantum phase diagram (in the thermodynamic limit) is found to have many interesting phases: commensurate and incommensurate magnetically ordered phases, and columnar dimer, Shastry-Sutherland and plaquette spin-gapped phases. Among themselves, these phases undergo a continuous or a level-crossing transition.
Kumar Brijesh
Kumar Rakesh
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