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- W2013256114 abstract "The geometric structure of the toroidal carbon nanotubes (TCN's) determines the electronic structure and thus the characteristics of the persistent current. Such current is caused by the magnetic flux ensuremath{varphi} through TCN's. The semiconducting TCN's exhibit diamagnetism at small ensuremath{varphi}, which is in great contrast with paramagnetism of the metallic TCN's. The induced magnetic moment is proportional to the toroid radius, but independent of the toroid width. The magnetic response is weak, while it is much stronger than that of a mesoscopic semiconductor or metal ring. The persistent current is a linearly periodical function of ensuremath{varphi}, with a period ${ensuremath{varphi}}_{0}(hc/e).$ Such an oscillation is the manifestation of the Aharonov-Bohm (AB) effect. Temperature $(T)$ does not destroy the periodical AB oscillation, although it would significantly reduce the persistent currents. The Zeeman splitting may lead to the destruction of the periodicity at very large ensuremath{varphi}. A larger TCN at lower $T$ and ensuremath{varphi} is relatively suitable for verifying the AB effect." @default.
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- W2013256114 date "1998-03-15" @default.
- W2013256114 modified "2023-10-18" @default.
- W2013256114 title "Persistent currents in toroidal carbon nanotubes" @default.
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- W2013256114 doi "https://doi.org/10.1103/physrevb.57.6731" @default.
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