Abstract
Taking into account the intrinsic curvature, we calculate the persistent currents (Ipcs) in chiral toroidal carbon nanotubes (TCNs) by developing the supercell approach. It is shown that in the presence of curvature, the typical current (Ity) oscillates with the unit cell number (P) and tends to be zero, while it damps exponentially in the absence of curvature. Due to the curvature effects, especially, a paramagnetism-diamagnetism transition is observed in chiral TCNs, depending on the ring diameter and chirality. In addition, the effect of external electric field energy (Eef) on persistent current is also explored. It is shown that in the presence of electric field, Ity vary unmonotonously with Eef. A pronounced peak of Ity is obtained at high Eef region. By modulating the value of Eef, a paramagnetism-diamagnetism or diamagnetism- paramagnetism transition is observed.
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Xu, N., Ding, J., Chen, H. et al. Curvature and external electric field effects on the persistent current in chiral toroidal carbon nanotubes. Eur. Phys. J. B 67, 71–75 (2009). https://doi.org/10.1140/epjb/e2009-00003-1
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DOI: https://doi.org/10.1140/epjb/e2009-00003-1