Effect of impurity potentials on antiferromagnetism in two-dimensional Hubbard model
Effect of impurity potentials on antiferromagnetism in two-dimensional Hubbard model
复制标题
二维哈伯德模型中杂质势对反铁磁性的影响
DOI：
10.1088/1742-6596/871/1/012032
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Kenji K. Kobayashi
中科院分区：
文献类型：
--
作者：
H. Yokoyama;R. Sato;Kenji K. Kobayashi
最近的数值研究表明，在二维Hubbard(t-t‘-U)模型中，反铁磁性(AF)在接近一半填充的情况下占优势，这与铜酸盐超导体的实验结果相反。在铜酸盐中，由于掺杂剂引起的紊乱在理论上通常被忽视，但可能是内在的和相当大的。因此，作为第一步，我们考虑了随机分布在晶格上的点型杂质势对AF稳定性的影响。结果表明，适度的杂质势并不改变AF的稳定性，但足够强的吸引势V(V≲−U)由于对V的屏蔽不足而明显削弱了反铁磁态。
Recent numerical studies have shown that antiferromagnetism (AF) prevails widely near half filling in the two-dimensional Hubbard (t-t′-U) model, contrary to the experiments on cuprate superconductors. In cuprates, disorders owing to the dopants, which are usually disregarded in theory, are possibly intrinsic and considerable. Thus, as a first step, we consider the effects of point-type impurity potentials, which are randomly distributed on the lattice sites, on the stability of AF. It is found that a moderate impurity potential does not modify the stability of AF, but a sufficiently strong attractive potential V(V ≲ −U) appreciably weakens an antiferromagnetic state owing to an insufficient screening of V.
影响因子：
1.7
作者：
H. Yokoyama;H. Shiba
通讯作者：
H. Yokoyama;H. Shiba