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arXiv 1207.7124cond-mat.str-el
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半金属磁化平台

Half-metallic magnetization plateaux

Zhihao Hao, Oleg A. Starykh

摘要:

我们提出了一种新的基于相互作用的二维晶格上的相互作用电子的半金属态的路线。平行于晶格施加的磁场用于将自旋密度之一调谐到与晶格值相当的特定值,其中系统经由范霍夫增强密度波状态自发地“锁定”。相反自旋极化的电子保持它们的金属特性,并提供半金属状态,此外,该半金属状态在外部磁场的有限间隔中支持磁化平台。在三角晶格上的有限U哈伯德模型中,在最大磁化强度的1/3处实现了类似的半金属态。

英文摘要:

We propose a novel interaction-based route to half-metal state for interacting electrons on two-dimensional lattices. Magnetic field applied parallel to the lattice is used to tune one of the spin densities to a particular commensurate with the lattice value in which the system spontaneously `locks in' via van Hove enhanced density wave state. Electrons of opposite spin polarization retain their metallic character and provide for the half-metal state which, in addition, supports magnetization plateau in a finite interval of external magnetic field. Similar half-metal state is realized in the finite-U Hubbard model on a triangular lattice at 1/3 of the maximum magnetization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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