Flat-band ferromagnetism in extended Δ-chain Hubbard models

被引：15

作者：

Ichimura, M ^{[1
]}

Kusakabe, K

Watanabe, S

Onogi, T

机构：

[1] Hitachi Ltd, Adv Res Lab, Hatoyama, Saitama 3500395, Japan

[2] Univ Tokyo, Inst Solid State Phys, Tokyo 1068666, Japan

[3] Univ Tokyo, Dept Mat Sci, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.58.9595

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We examined the magnetic property of newly extended Delta-chain Hubbard models which may be relevant to quantum atomic wires formed on solid surfaces. We rigorously show that the extended models exhibit so-called flat-band ferromagnetism, based on the Mielke-Tasaki theorem. Moreover, we numerically find that the ferromagnetic state is stable against some deviations from completely flat band, by using the exact diagonalization method. The present result will be also useful as a guiding principle possibly display the flat-band ferromagnetism. [S0163-1829(98)09139-5].

引用

页码：9595 / 9598

页数：4

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