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arXiv 1012.5177cond-mat.str-elcond-mat.stat-mech
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一维物理从畸变Shastry-Sutherland晶格中的出现

Emergence of One-Dimensional Physics from the Distorted Shastry-Sutherland Lattice

M. Moliner, I. Rousochatzakis, F. Mila

摘要:

受高压下SrCu $_2$(BO $_3$)$_2$研究的启发,我们研究了二维Shastry-Sutherland(SS)自旋1/2模型的一个变体,其中包含两种二聚体.结合挫折的SS模型,这种修改诱导,在一个大的参数范围内,在低能量的降维,与几乎解耦的有效的S=1的Halcantine链形成沿一个对角线的晶格。我们还提出的证据表明,中间元格固相的未扭曲的SS模型保持稳定在一个有限的区域的相图。

英文摘要:

Motivated by the on-going investigation of SrCu$_2$(BO$_3$)$_2$ under pressure, we study a variant of the two-dimensional Shastry-Sutherland (SS) spin-1/2 model with two types of dimers. Combined with the frustration of the SS model, this modification induces, in a large parameter range, a dimensional reduction at low energies, with nearly decoupled effective S=1 Haldane chains forming along one of the diagonals of the lattice. We also present evidence that the intermediate plaquette solid phase of the undistorted SS model remains stable in a finite region of the phase diagram.

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