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arXiv 1503.08204cond-mat.str-elcond-mat.mtrl-sci
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单六边形上Kitaev-Heisenberg模型的量子相变

Quantum phase transitions in the Kitaev--Heisenberg model on a single hexagon

Dorota Gotfryd, Andrzej M. Oleś

摘要:

本文详细分析了单六边形上的Kitaev-Heisenberg模型。使用精确对角化得到的能谱和自旋-自旋关联表明,当Kitaev相互作用增加时,反铁磁和各向异性自旋关联之间发生量子相变。在集团平均场方法中,受抑最近邻交换使条纹相稳定在Néel相和向Kitaev自旋液体演化的受抑相之间。

英文摘要:

We present a detailed analysis of the Kitaev--Heisenberg model on a single hexagon. The energy spectra and spin--spin correlations obtained using exact diagonalisation indicate quantum phase transitions between antiferromagnetic and anisotropic spin correlations when the Kitaev interactions increase. In cluster mean-field approach frustrated nearest neighbor exchange stabilizes the stripe phase in between the Néel phase and frustrated one which evolves towards the Kitaev spin liquid.

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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