Defect-induced multicomponent electron scattering in single-walled carbon nanotubes

Details Defect-induced multicomponent electron scattering in single-walled carbon nanotubes Defect-induced multicomponent electron scattering in single-walled carbon nanotubes

2010-11-05

arxiv.org/abs/1011.1423v2

Phys. Rev. B 83, 165439 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

http://link.aps.org/doi/10.1103/PhysRevB.83.165439

Scientific paper

10.1103/PhysRevB.83.165439

We present a detailed comparison between theoretical predictions on electron scattering processes in metallic single-walled carbon nanotubes with defects and experimental data obtained by scanning tunneling spectroscopy of Ar$^+$ irradiated nanotubes. To this purpose we first develop a formalism for studying quantum transport properties of defected nanotubes in presence of source and drain contacts and an STM tip. The formalism is based on a field theoretical approach describing low-energy electrons. We account for the lack of translational invariance induced by defects within the so called extended kp approximation. The theoretical model reproduces the features of the particle-in-a-box-like states observed experimentally. Further, the comparison between theoretical and experimental Fourier-transformed local density of state maps yields clear signatures for inter- and intra-valley electron scattering processes depending on the tube chirality.

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