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arXiv 2302.07894cond-mat.str-el
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含弱层间耦合的Shastry-Sutherland模型的张量网络研究

Tensor network study of the Shastry-Sutherland model with weak interlayer coupling

Patrick C. G. Vlaar, Philippe Corboz

AI总结:

本研究针对SrCu₂(BO₃)₂中间plaquette相范围与理论预测不符的问题,采用张量网络方法研究含弱层间耦合的Shastry-Sutherland模型,修正了相失稳的耦合阈值,并估算出该材料常压下的有效层间耦合值。

摘要:

层状材料SrCu$_2$(BO$_3$)$_2$因其在磁场和压力下的迷人物理特性,长期以来一直被研究。它的许多特性都能被Shastry-Sutherland模型(SSM,一种二维阻挫自旋系统)很好地描述。然而,在压力下于SrCu$_2$(BO$_3$)$_2$中发现的中间 plaquette 相的范围,远小于理论预测值,这很可能源于材料中存在但模型中被忽略的弱层间耦合。我们采用前沿的张量网络方法,研究了含弱层间耦合的SSM,结果表明,中间plaquette相在$J''/J\thicksim0.04-0.05$的更小值时就已失稳,低于此前级数展开的预测值。基于我们的相图,我们估算出常压下SrCu$_2$(BO$_3$)$_2$的有效层间耦合约为$J''/J\thicksim0.027$。

英文摘要:

The layered material SrCu$_2$(BO$_3$)$_2$ has long been studied because of its fascinating physics in a magnetic field and under pressure. Many of its properties are remarkably well described by the Shastry-Sutherland model (SSM) - a two-dimensional frustrated spin system. However, the extent of the intermediate plaquette phase discovered in SrCu$_2$(BO$_3$)$_2$ under pressure is significantly smaller than predicted in theory, which is likely due to the weak interlayer coupling that is present in the material but neglected in the model. Using state-of-the-art tensor network methods we study the SSM with a weak interlayer coupling and show that the intermediate plaquette phase is destabilized already at a smaller value around $J''/J\sim0.04-0.05$ than previously predicted from series expansion. Based on our phase diagram we estimate the effective interlayer coupling in SrCu$_2$(BO$_3$)$_2$ to be around $J''/J\sim0.027$ at ambient pressure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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