Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-14
Phys. Rev. B 81, 064428 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 9 figures
Scientific paper
10.1103/PhysRevB.81.064428
We have obtained the zero-temperature phase diagram of the kagome antiferromagnet with Dzyaloshinskii-Moriya interactions in Schwinger-boson mean-field theory. We find quantum phase transitions (first or second order) between different topological spin liquids and Neel ordered phases (either the $\sqrt{3} \times \sqrt{3}$ state or the so-called Q=0 state). In the regime of small Schwinger-boson density, the results bear some resemblances with exact diagonalization results and we briefly discuss some issues of the mean-field treatment. We calculate the equal-time structure factor (and its angular average to allow for a direct comparison with experiments on powder samples), which extends earlier work on the classical kagome to the quantum regime. We also discuss the dynamical structure factors of the topological spin liquid and the Neel ordered phase.
Cepas Olivier
Lhuillier Claire
Messio Laura
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