Investigating Chemical Disorder Strength in Carbon Nanotubes: Magnetic Tuning of Quantum Transport Regimes

We have studied the various transport regime that develop in ni-trogen doped metallic carbon nanotubes under magnetic elds [3]. By combining abinitio and semi-empirical models [1], a scaling analysis of the Landauer conductance has been performed and characteristic transport length scales extracted from phenomenological laws. A quantitative analysis of the relationship between energy-dependant elastic mean free path and localization length has been done, and an external magnetic eld applied perpendiculary to the nanotube axis is shown to induce a shift in energies of quasibound states, a phe-nomenon that results in giant magnetoconductance uctuations under Fermi level shift. References [1] Ch. Adessi, Stephan Roche, and X. Blase. Reduced backscaterring in potassium doped nanotubes: ab-initio and semiempirical simulations. Physical Review B, 73(125414), March 2006