Metal-Insulator Transition of the Hubbard Chain with Next-Nearest-Neighbor Hopping-Partially Ferromagnetic Metal toward Mott Insulator-
Metal-Insulator Transition of the Hubbard Chain with Next-Nearest-Neighbor Hopping-Partially Ferromagnetic Metal toward Mott Insulator-
复制标题
具有次近邻跳跃的哈伯德链的金属-绝缘体转变-部分铁磁金属朝向莫特绝缘体-
DOI：
10.1143/jpsj.73.983
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发表时间：
2004
影响因子：
1.7
通讯作者：
Y. Takahashi
中科院分区：
文献类型：
--
作者：
H. Nakano;Y. Takahashi
用精确对角化方法研究了具有次近邻跳变的哈伯德链基态的金属绝缘子跃迁。在较大的库仑斥力下，该模型显示了莫特绝缘体附近的部分铁磁性金属，而在较小但有限的库仑斥力下，该模型显示了非磁性金属。我们发现部分铁磁性金属和莫特绝缘子之间的转变没有相分离。当系统从部分铁磁性金属的侧面接近金属-莫特-绝缘体过渡点时，观察到发散电荷压缩率与空穴密度有关的一个新的临界指数。我们还发现在更大的库仑排斥下，部分铁磁性金属和莫特绝缘体之间会发生相分离。从磁性和金属-绝缘体转变的角度来看，这里提出的模型是有趣的。
Metal–insulator transition in the ground state of the Hubbard chain with the next-nearest-neighbor hopping is studied by exact diagonalization method. This model shows the partially ferromagnetic metal near the Mott insulator for large Coulomb repulsion while the model reveals the non-magnetic metal for small but finite Coulomb repulsion. We find the transition between the partially ferromagnetic metal and the Mott insulator without phase separation. A new critical exponent of the diverging charge compressibility with respect to the hole density is observed when the system approaches the metal–Mott-insulator transition point from the side of the partially ferromagnetic metal. We also find the occurrence of the phase separation between partially ferromagnetic metal and the Mott insulator for even larger Coulomb repulsion. The model proposed here is interesting in view of the magnetism as well as the metal–insulator transition.
影响因子：
3.7
作者：
S. Daul;R. Noack
通讯作者：
S. Daul;R. Noack
具有轨道简并的一维哈伯德模型中的铁磁性：从低电子密度到高电子密度
DOI：
--
发表时间：
2002
期刊：
Phys.Rev.B 65
影响因子：
--
作者：
H.Sakamoto;T.Momoi;K.Kubo
通讯作者：
K.Kubo