Quantum electron transport in kagome-lattice-chain systems with electric fields

被引：13

作者：

Ishii, H ^{[1
]}

Nakayama, T ^{[1
]}

机构：

[1] Chiba Univ, Dept Phys, Fac Sci, Inage Ku, Chiba 2638522, Japan

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.73.235311

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electron transport properties are investigated in the kagome-lattice-chain systems using a simple tight-binding model and a nonequilibrium Green function method. It is found that the flat-band-like-state channel in a kagome-lattice-chain system generates a large electronic current along the chain when a small electric field is applied perpendicular to the chain, while no current is generated along the chain when an electric field is applied along the chain. We show that this strange anisotropy originates from the itinerant and localized characteristics of flat-band-like states. Moreover, we observe that the transport characteristic changes from the quantum interference to noninterference regimes with increasing electric field, and the current magnitude is nearly independent of the size of the kagome-lattice chain in the intermediate regime.

引用

页数：11

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