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Research PapersNo Access

ZEEMAN EFFECT ON THE ELECTRONIC STRUCTURE OF CARBON NANOTORI IN A STRONG MAGNETIC FIELD

C. P. LIU

Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, 421008, Hunan, China

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https://doi.org/10.1142/S0217979208049030Cited by:4 (Source: Crossref)

Abstract

We mainly study the Zeeman effect on electronic structure of carbon nanotori in the presence of magnetic field (B) perpendicular to the tori's plane. As a function of magnetic flux (ϕ), the energy gap (E_g) and density of states (DOS) near the Fermi level are obtained in the case of with and without considering the Zeeman effect. Without spin-B interaction, the ϕ-dependent electronic structure would exhibit the periodical Aharonov–Bohm (AB) oscillation. A magnetic-field-induced semiconductor-metal transition is indicated in the variation of energy gap and DOS of armchair tori. The Zeeman effect on electronic structure is notable at relatively large ϕ (~100ϕ₀, with ϕ₀ = h/e), e.g., more phase transition points may appear in the E_g - B dependence for armchair tori, and the destruction of periodical AB oscillation is distinct due to the Zeeman effect. These results may be observed by scanning tunneling spectroscopy measurement.

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Vol. 22, No. 27

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Received 31 August 2007

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