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arXiv 0812.0439cond-mat.mes-hall
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金属环和金属盖中的持续电流

Persistent Current in Metallic Rings and Cylinders

Santanu K. Maiti

摘要:

我们在紧束缚框架下研究了介观单通道环和多通道柱中的持续电流和低场磁响应行为。我们发现,持续电流的特征性质强烈依赖于电子总数$N_e$,化学势$μ$,随机性和通道总数。对低场磁响应的研究表明,只有当$N_e$固定时,才能准确地预测低场电流的符号,即使在存在无序的情况下。另一方面,对于多通道圆柱体,即使在具有固定$N_e$的完美系统中,也不能准确地提及低场电流的符号,因为它显著地取决于$N_e$、$μ$、通道数量、无序配置等的选择。

英文摘要:

We explore the behavior of persistent current and low-field magnetic response in mesoscopic one-channel rings and multi-channel cylinders within the tight-binding framework. We show that the characteristic properties of persistent current strongly depend on total number of electrons $N_e$, chemical potential $μ$, randomness and total number of channels. The study of low-field magnetic response reveals that only for one-channel rings with fixed $N_e$, sign of the low-field currents can be predicted exactly, even in the presence of disorder. On the other hand, for multi-channel cylinders, sign of the low-field currents cannot be mentioned exactly, even in the perfect systems with fixed $N_e$ as it significantly depends on the choices of $N_e$, $μ$, number of channels, disordered configurations, etc.

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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