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arXiv 0902.1456cond-mat.str-el
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掺杂杂质的Shastry-Sutherland反铁磁体SrCu $_2$(BO $_3$)$_2$的拉曼光谱理论

Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu$_2$(BO$_3$)$_2$ doped with nonmagnetic impurities

S. Capponi, D. Poilblanc, F. Mila

摘要:

SrCu $_2$(BO $_3$)$_2$(海森堡自旋1/2反铁磁体在Shastry-Sutherland晶格上的忠实实现)与非磁性杂质的受控掺杂在自旋隙以下产生束缚态。这些束缚态和它们的对称性进行了研究,精确对角化的小集群和一个简单有效的模型描述一个自旋提交一个有吸引力的扩展潜力。结果表明,拉曼光谱是一种独特的技术来探测这些束缚态。定量的理论拉曼光谱的数值得到。

英文摘要:

Controlled doping of SrCu$_2$(BO$_3$)$_2$, a faithful realization of the Heisenberg spin-1/2 antiferromagnet on the Shastry-Sutherland lattice, with non-magnetic impurities generates bound-states below the spin gap. These bound-states and their symmetry properties are investigated by exact diagonalisation of small clusters and within a simple effective model describing a spinon submitted to an attractive extended potential. It is shown that Raman spectroscopy is a unique technique to probe these bound-states. Quantitative theoretical Raman spectra are numerically obtained.

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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