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arXiv 1012.5908cond-mat.str-elcond-mat.mes-hall
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基于电流晶格密度泛函理论的一维哈伯德模型的持续电流和Drude重量

Persistent current and Drude weight for the one-dimensional Hubbard model from current lattice density functional theory

A. Akande, S. Sanvito

摘要:

将一维排斥性哈伯德模型的晶格密度泛函理论的Bethe-Anglesian局域密度近似(LDA)推广到电流密度泛函理论(CLDFT).利用该方案系统地研究了磁通量穿过的介观Hubbard环的输运性质。特别是,我们目前的基态能量,持续电流和Drude重量的排斥均匀和单一杂质哈伯德模型的计算。我们的金属相的基态能量的结果与数值精确的多体技术所获得的结果相比,毫不逊色。LDA-CLDFT也很好地捕捉到了持续电流对库仑和杂质相互作用强度以及环尺寸的依赖关系。我们的研究表明,CLDFT是一个强大的工具,用于研究一维相关电子系统的高精度和低计算成本。

英文摘要:

The Bethe-Ansatz local density approximation (LDA) to lattice density functional theory (LDFT) for the one-dimensional repulsive Hubbard model is extended to current-LDFT (CLDFT). The transport properties of mesoscopic Hubbard rings threaded by a magnetic flux are then systematically investigated by this scheme. In particular we present calculations of ground state energies, persistent currents and Drude weights for both a repulsive homogeneous and a single impurity Hubbard model. Our results for the ground state energies in the metallic phase compares favorably well with those obtained with numerically accurate many-body techniques. Also the dependence of the persistent currents on the Coulomb and the impurity interaction strength, and on the ring size are all well captured by LDA-CLDFT. Our study demonstrates that CLDFT is a powerful tool for studying one-dimensional correlated electron systems with high accuracy and low computational costs.

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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