Mechanical deformations cause to change the electronic properties in carbon nanotubes. In this paper, the uniaxial strain
and length effects have been investigated on the quantum conductance of (12,0) and (8,0) finite Zigzag Single Wall
Carbon Nanotubes (ZSWCNT) at Fermi energy, using the tight binding model and the Green's function technique. In the
absence of strain, all the finite ZSWCNTs are metal because of localization. Our probes show that by controlling the
uniaxial strain and carbon nanotube length, a metal-semiconductor transition occurs for (8,0) finite ZSWCNT under the
compressive strain condition and the length longer than 37 A0. However, under the all strain and length variations that
investigated conditions in this paper, the localization length is longer than the length of (12,0) finite ZSWCNT, so that it
remains metallic and the quantum conductance is non-zero.
Some exciting applications of the correspondence between the mechanical response and the electronic transport of the
carbon nanotubes are nano-electromechanical switch, sensor applications.