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arXiv 1301.7672cond-mat.str-el
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非阻挫关联系统中自旋液体的不存在

Absence of spin liquid in non-frustrated correlated systems

S. R. Hassan, David Sénéchal

摘要:

在蜂窝(又名石墨烯)晶格上的半填充哈伯德模型中存在自旋液体状态的问题被重新讨论。变分团簇近似(VCA)、团簇动力学场论(CDMFT)和团簇动力学杂质近似(CDIA)被应用于各种团簇系统。假设自旋液相与Mott绝缘相重合,我们发现Mott相变被发生在较低相互作用值$U$处的磁相变所取代,因此自旋液相不发生.这一结论是使用两个浴轨道连接到每个边界集群网站的集群。我们认为,使用一个单一的浴轨道每个边界网站是不够的,并导致错误的结论,该系统是缺口的所有非零值的$U$。

英文摘要:

The question of the existence of a spin liquid state in the half-filled Hubbard model on the honeycomb (aka graphene) lattice is revisited. The Variational Cluster Approximation (VCA), the Cluster Dynamical Mean Field Theory (CDMFT) and the Cluster Dynamical Impurity Approximation (CDIA) are applied to various cluster systems. Assuming that the spin liquid phase coincides with the Mott insulating phase in this non-frustrated system, we find that the Mott transition is pre-empted by a magnetic transition occuring at a lower value of the interaction $U$, and therefore the spin liquid phase does not occur. This conclusion is obtained using clusters with two bath orbitals connected to each boundary cluster site. We argue that using a single bath orbital per boundary site is insufficient and leads to the erroneous conclusion that the system is gapped for all nonzero values of $U$.

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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