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arXiv 1201.5503cond-mat.str-elcond-mat.mtrl-sci
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强关联巡游系统中Dzyaloshinskiii-Moriya相互作用的影响

Impact of the Dzyaloshinskii-Moriya interaction in strongly correlated itinerant systems

Sergej Schuwalow, Christoph Piefke, Frank Lechermann

摘要:

在强相互作用的材料中,仅用自旋方法来研究各向异性效应往往不足以处理接近莫特区的系统。在一个模型的背景下,在这里的低对称性相关的Dzyaloshinskiii-Moriya(DM)相互作用的后果进行了研究,强相关,但整体巡回,系统。也就是说,我们调查的哈伯德双层模型补充了DM项在半填充和空穴掺杂制度。作为补充,还提供了含DM相互作用的双杂质Anderson模型的进一步结果。模型的哈密顿处理的旋转不变的从玻色子技术在鞍点内(细胞)集群的方法。各向异性相互作用的小值已经证明随着U的增加对相位和关联函数有很强的影响。一个有趣的金属自旋触发器相被发现在掺杂的双层模型和减少的RKKY交换在两个杂质模型。

英文摘要:

Spin-only approaches to anisotropic effects in strongly interacting materials are often insufficient for systems close to the Mott regime. Within a model context, here the consequences of the low-symmetry relevant Dzyaloshinskii-Moriya (DM) interaction are studied for strongly correlated, but overall itinerant, systems. Namely, we investigate the Hubbard bilayer model supplemented by a DM term at half filling and in the hole-doped regime. As an add-on, further results for the two- impurity Anderson model with DM interaction are also provided. The model Hamiltonians are treated by means of the rotational invariant slave boson technique at saddle point within a (cellular) cluster approach. Already small values of the anisotropic interaction prove to have a strong influence on the phases and correlation functions with increasing U. An intriguing metallic spin-flop phase is found in the doped bilayer model and a reduction of the RKKY exchange in the two-impurity model.

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