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arXiv 1601.07076cond-mat.str-el
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石墨烯晶格上的Kekulé超导电性和反铁磁性

Kekulé superconductivity and antiferromagnetism on the graphene lattice

J. P. L. Faye, M. N. Diarra, D. Sénéchal

摘要:

利用变分集团近似(VCA)和精确对角化方法研究了零温下二维石墨烯晶格上扩展的哈伯德模型的超导序.在参考文献$[1]$的结果的基础上,我们将均匀SC解与参考文献$[2]$中提出的非均匀Kekulé($p+ip$ -K)超导模式进行竞争。$[1]$将三重态$p$波和$p+ip$波超导确定为该模型中最有利的配对对称。我们发现,$p+ip$ -K解决方案实际上是最有利的配对在大多数的相图。此外,我们表明,反铁磁性可以共存的$p+ip$ -K状态,这两个订单的增强,它们的共存。

英文摘要:

We investigate superconducting order in the extended Hubbard model on the two-dimensional graphene lattice using the variational cluster approximation (VCA) with an exact diagonalization solver at zero temperature. Building on the results of Ref.$[1]$, which identified triplet $p$- and $p+ip$-wave superconductivity as the most favored pairing symmetries in that model, we place uniform SC solutions in competition with the proposed nonuniform Kekulé ($p+ip$-K) superconducting pattern proposed in Ref.$[2]$. We find that the $p+ip$-K solution is in fact the most favored pairing in most of the phase diagram. In addition, we show that antiferromagnetism can co-exist with the $p+ip$-K state and that both orders are enhanced by their coexistence.

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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