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D. RACOLTA1,* , C. ANDRONACHE1
- Technical University of Cluj Napoca, North University Center of Baia Mare, Str. Victoriei 76 430122, Baia Mare, Romania
In this paper we one deals with the theoretically study of the magnetic and transport properties on carbon nanotubes. To this aim one resorts to a tight binding model by accounting for a single π- band, in which spin degrees of freedom have also been accounted for. We show that the application of an external magnetic field produces changes in transport properties of carbon nanotubes. When the applied magnetic field is parallel to the tube axis, one gets faced with the implementation of the well-known Aharonov-Bohm (AB) quantum phase which is relevant for applications in mesoscopic devices. We found that the AB-oscillations in carbon nanotubes with zig-zag boundary conditions are characterized by integer (ф0) and (ф0/2) magnetic-flux periods. This result leads to sawtooth-type oscillations relying on the parity of the electron number. In the presence of a transversal magnetic field we found a halving of the Fermi velocity and an increase of the density of states (DOS) in metallic nanotubes, which is reflected in conductance measurements, while the energy gap is suppressed in semiconducting nanotubes..
Carbon nanotubes, Persistent currents, Aharonov-Bohm effect.
Submitted at: Oct. 20, 2016
Accepted at: Oct. 10, 2017
D. RACOLTA, C. ANDRONACHE, Theoretically study of the magnetic and transport properties on carbon nanotubes, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 9-10, pp. 658-662 (2017)
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