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We present simulations of electronic transport in single-wall and multi-wall carbon nanotubes, which are placed between two metallic contacts. We consider situations where the electrons first encounter a singe-wall nanotube (corresponding to either the inner or the outer shell of the (10,10)@(15,15)@(20,20) and (10,10)@(20,10)@(20,20) nanotubes), before encountering the multi-wall structures. The...
In order to address the band-structure and transport properties of carbon nanotubes, we build a local pseudopotential from the requirement that results relevant to the π-bands of simple hexagonal graphite and isolated graphene sheets are reproduced. We then apply a transfer-matrix technique to compute the band structure and conductance of the (10,0), (5,5), (10,10), (15,15) and (10,10)@(15,15) carbon...
We present simulations of field emission from 2-nm long open (5,5), closed (5,5) and open (10,0) carbon nanotubes. Besides usual effects associated with the field-emission process, the total-energy distributions of the field-emitted electrons present peaks that are shifted by the electric field. Their sharpness and the evolution of their amplitude when changing the electric field depend on the semiconducting...
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