Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Nanoelectronics III - Molecular Electronics

TT 6.6: Vortrag

Montag, 26. März 2007, 15:30–15:45, H19

Electron transport in bundles of metallic single-walled carbon nanotubes — •Ines Barbara Klugius¹, Christoph Wolfgang Marquardt¹, Frank Hennrich¹, Hilbert v. Löhneysen^2,3, and Ralph Krupke¹ — ¹Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany — ²Universität Karlsruhe, Physikalisches Institut, 76128 Karlsruhe, Germany — ³Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany

Electron transport in individual metallic single-walled carbon nanotubes (SWNT) has been described within a Luttinger liquid model (LL) which can explain the power law behaviour found in the temperature dependent conductance, as well as in the voltage dependent differential conductance. In heterogeneous bundles of SWNTs, that are composites of metallic and semiconducting tubes, similar power law behaviour has been observed.

During the fabrication of carbon nanotubes both metallic and semicon-ducting ones are produced. Using dielectrophoresis as a method to separate these types, we are able to prepare samples of bundles of exclusively metallic SWNTs. In this configuration, the SWNTs are still surrounded by the surfactant that is necessary for the separation process. On such samples we measure the transport characteristics and anticipate a deviation from the LL behaviour due to enhanced intertube coupling. To enforce the coupling, we anneal the samples assuming that in this manner, the amount of surfactant inbetween the tubes is abated and the tube-tube distance is reduced.