Curvature and Zeeman effects on persistent currents in a multi-walled carbon nanotorus

doi:10.1088/1674-1056/19/1/016101

Abstract Taking into account both the intrinsic curvature and Zeeman effects, persistent currents in a multi-walled carbon nanotorus are explored by using a supercell method, within the tight-binding formalism. It is shown that in the absence of the Zeeman effect, the intrinsic curvature induces some dramatic changes in energy spectra and thus changes in the shape of the flux-dependent current. A paramagnetism--diamagnetism transition is observed. With consideration of the Zeeman splitting energy, the period of persistent current is destroyed, and a diamagnetism--paramagnetism transition is obtained at high magnetic field. In addition, we further explore the effect of external electric field energy (E_ef) on persistent current, indicating that it changes unmonotonously with E_ef.

Keywords: multi-walled carbon nanotorus tight-binding model persistent current

Received: 23 April 2009
Revised: 23 June 2009
Accepted manuscript online:

PACS:	75.75.+a
	61.46.-w	(Structure of nanoscale materials)
	71.70.Ej	(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
	73.23.Ra	(Persistent currents)
	75.20.Ck	(Nonmetals)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

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 China (Grant No.~200726), Scientific Research Fund of Hunan Provincial Education Department of China (Grant No.~06A071), and partially by Hunan Provincial Innovation Foundation For Postgraduate (Grant No.~S2008yjscx06).

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Xu Ning(徐宁), Ding Jian-Wen(丁建文), Ma Ming-Ming(马明明), and Tang Xian(汤贤) Curvature and Zeeman effects on persistent currents in a multi-walled carbon nanotorus 2010 Chin. Phys. B 19 016101

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Curvature and Zeeman effects on persistent currents in a multi-walled carbon nanotorus

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