Open AccessEffect of contact interfaces on quantum conductance of armchair nanotubes
Author(s) -
Krompiewski S.
Publication year - 2003
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
eISSN - 1521-396X
pISSN - 0031-8965
DOI - 10.1002/pssa.200306345
Subject(s) - conductance , quantum tunnelling , carbon nanotube , magnetoresistance , condensed matter physics , materials science , quantization (signal processing) , conductance quantum , formalism (music) , fermi energy , quantum , nanotechnology , physics , quantum mechanics , quantum well , quantum point contact , electron , magnetic field , art , musical , laser , computer science , visual arts , computer vision
Effect of contact interfaces, between metallic single‐wall carbon nanotubes (SWCNT) and external electrodes made also of nanotubes, on the electrical conductance is studied. A tight‐binding model with both diagonal and off‐diagonal disorder, a recursive Green function technique as well as the Landauer formalism are used. The studies are carried out within the coherent transport regime and are focused on: (i) evolution from conductance quantization to resonant tunneling, (ii) SWCNT's length effects and (iii) magnetoresistance. It is shown that the so‐called on‐resonance devices, i.e. nanotubes having a conductance peak at the Fermi energy, occur with a period of 3 carbon inter‐ring spacings. Additionally, the present approach provides an insight into magnetoresistance dependence of SWCNTs on conditions at the contact interface.