S. Barraza-Lopez et al 2005 Europhys. Lett. 69 1003 doi:10.1209/epl/i2004-10434-8
S. Barraza-Lopez1, S. V. Rotkin2, Y. Li1 and K. Hess1
Show affiliationsWe calculate the effects of a longitudinal electrostatic perturbation on a metallic single-wall carbon nanotube and demonstrate conductance modulation. Such external modulation would be completely screened in bulk 3D metals but is possible in SWNTs because their electrons are quasi–two-dimensional and can interact with a nearby system of charges. The resultant modulation of the conductance is determined by the strength of the self-consistent potential and its periodicity over shorter or longer distances. We employ the zero-temperature single-particle Green's function transport approach in the empirical tight-binding approximation to quantify the modulation of conductance and also consider the limit of a superlattice.
71.30.+h Metal-insulator transitions and other electronic transitions
Condensed matter: electrical, magnetic and optical
Issue 6 (March 2005)
Received 22 October 2004, accepted for publication 17 January 2005, in final form 17 January 2005
Published 16 February 2005
S. Barraza-Lopez et al 2005 Europhys. Lett. 69 1003
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