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arXiv 0906.3795cond-mat.mes-hallcond-mat.mtrl-sci
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介观圆柱体中的持续电流:径向磁场的影响

Persistent current in a mesoscopic cylinder: effects of radial magnetic field

Santanu K. Maiti, F. Aeenehvand

摘要:

在这项工作中,我们研究了在纵向和横向磁通的介观柱体中的持续电流。一个简单的紧束缚模型被用来描述系统,其中所有的计算完全在非相互作用的电子图片内进行。数值研究了电流$I$与电子总数$N_e$、系统尺寸$N$、纵向磁通量$ϕ_l$和横向磁通量$ϕ_t$的关系。非常有趣的是,我们观察到,典型的电流振幅振荡作为横向磁通量的函数,与能量通量特性,显示$N ϕ_0$通量量子周期性,其中$N$和$ϕ_0$ $(=ch/e)$分别对应于系统的大小和基本通量量子。这种分析可能会提供一个新的方面的持久电流的多通道圆柱形系统中存在的径向磁场$B_r$,与通量$ϕ_t$。

英文摘要:

In this work, we study persistent current in a mesoscopic cylinder subjected to both longitudinal and transverse magnetic fluxes. A simple tight-binding model is used to describe the system, where all the calculations are performed exactly within the non-interacting electron picture. The current $I$ is investigated numerically concerning its dependence on total number of electrons $N_e$, system size $N$, longitudinal magnetic flux $ϕ_l$ and transverse magnetic flux $ϕ_t$. Quite interestingly we observe that typical current amplitude oscillates as a function of the transverse magnetic flux, associated with the energy-flux characteristics, showing $N ϕ_0$ flux-quantum periodicity, where $N$ and $ϕ_0$ $(=ch/e)$ correspond to the system size and the elementary flux-quantum respectively. This analysis may provide a new aspect of persistent current for multi-channel cylindrical systems in the presence of radial magnetic field $B_r$, associated with the flux $ϕ_t$.

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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