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

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

中国物理B ›› 2010, Vol. 19 ›› Issue (1): 16101-016101.doi: 10.1088/1674-1056/19/1/016101

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

徐宁, 丁建文, 马明明, 汤贤

Department of Physics and Institute for Nanophysics and Rare-earth Luminescence, Xiangtan University, Xiangtan 411105, China

收稿日期:2009-04-23 修回日期:2009-06-23 出版日期:2010-01-15 发布日期:2010-01-15
基金资助:
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).

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

Xu Ning(徐宁), Ding Jian-Wen(丁建文)^†, Ma Ming-Ming(马明明), and Tang Xian(汤贤)

Department of Physics and Institute for Nanophysics and Rare-earth Luminescence, Xiangtan University, Xiangtan 411105, China

Received:2009-04-23 Revised:2009-06-23 Online:2010-01-15 Published:2010-01-15
Supported by:
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).

摘要/Abstract

摘要： 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.

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.

Key words: multi-walled carbon nanotorus, tight-binding model, persistent current

中图分类号:

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.))

徐宁, 丁建文, 马明明, 汤贤. Curvature and Zeeman effects on persistent currents in a multi-walledcarbon nanotorus[J]. 中国物理B, 2010, 19(1): 16101-016101.

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[J]. Chin. Phys. B, 2010, 19(1): 16101-016101.

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

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

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