Abstract The persistent current in three-dimensional ($P\times N^2)$ nanorings as a function of the unit cell number ($P)$, the channel number ($M = N^2)$, surface disorder ($\xi )$, and temperature ($T)$ is theoretically investigated in terms of rotational symmetry. On the whole, the typical current increases linearly with $\sqrt M $ but decreases exponentially with $P$, while wide fluctuations exist therein. In the presence of surface disorder, the persistent current decreases with $\xi $ in the regime of weak disorder but increases in the regime of strong disorder. In addition, it is found that the persistent current in perfect rings decreases exponentially with temperature even at $T < T^*$, while in most disorder rings, the typical current decreases slightly with temperature at $T < T^*$.
Received: 24 June 2008
Revised: 17 September 2008
Accepted manuscript online:
(Electronic transport in nanoscale materials and structures)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10674113), Program for
New Century Excellent Talents in University of China (Grant No
NCET-06-0707), Foundation for the Author of National Excellent
Doctoral Dissertation of C
Cite this article:
Xu Ning(徐宁), Ding Jian-Wen(丁建文), Chen Hong-Bo(陈宏波), and Ma Ming-Ming(马明明) Persistent currents in three-dimensional shell-doped nanorings 2009 Chin. Phys. B 18 2030
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