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首页> 外文期刊>Physical review letters >Quadrupolar Phases of the S = 1 Bilinear-Biquadratic Heisenberg Model on the Triangular Lattice
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Quadrupolar Phases of the S = 1 Bilinear-Biquadratic Heisenberg Model on the Triangular Lattice

机译:三角晶格上S = 1的双线性-双二次Heisenberg模型的四极相

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摘要

Using mean-field theory, exact diagonalizations, and SU(3) flavor theory, we have precisely mapped out the phase diagram of the S = 1 bilinear-biquadratic Heisenberg model on the triangular lattice in a magnetic field, with emphasis on the quadrupolar phases and their excitations. In particular, we show that ferroquadrupolar order can coexist with short-range helical magnetic order, and that the antiferroqua-drupolar phase is characterized by a remarkable 2/3 magnetization plateau, in which one site per triangle retains quadrupolar order while the other two are polarized along the field. Implications for actual S = 1 magnets are discussed.
机译:使用平均场理论,精确对角化和SU(3)风味理论,我们在磁场中的三角形晶格上精确绘制了S = 1双线性-双二次海森堡模型的相图,重点是四极相及其激发。特别是,我们证明四极铁阶可以与短程螺旋磁阶共存,并且反铁四极相的特征是具有显着的2/3磁化平稳期,其中每个三角形一个位点保持四极阶,而其他两个位点保持四极阶。沿两极分化。讨论了实际的S = 1磁体的含义。

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