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TT: Fachverband Tiefe Temperaturen

TT 51: TR: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2

TT 51.1: Vortrag

Donnerstag, 17. März 2011, 14:00–14:15, HSZ 304

Correlation of quantum transport and tip-enhanced Raman spectroscopy on carbon nanotubes — •Karin Goß¹, Niculina Peica², Sebastian Smerat³, Martin Leijnse⁴, Maarten R. Wegewijs^1,5, Christian Thomsen², Janina Maultzsch², Claus M. Schneider¹, and Carola Meyer¹ — ¹Peter Grünberg Institut, Forschungszentrum Jülich & JARA Jülich Aachen Research Alliance, Jülich, Germany — ²Institut für Festkörperphysik, TU Berlin, Germany — ³Physics Department, Arnold Sommerfeld Center for Theoretical Physics, LMU München, Germany — ⁴Niels Bohr Institute & Nano-Science Center, University of Copenhagen, Denmark — ⁵Institut für Theoretische Physik A, RWTH Aachen, Germany

Carbon nanotube (CNT) ropes offer a generic system to study the interactions of molecules with their environment. We show quantum transport spectra of a contacted rope, which consists of several CNT strands forming parallel quantum dots at low temperature. From their distinct interaction properties, we count at least five parallel dots. In order to attribute these to the different strands within the rope, it is characterized using tip-enhanced Raman spectroscopy. This method offers both an increased spatial resolution and a high signal enhancement. From the diameter dependent Raman modes in combination with a tentative chiral assignment, we identify several CNTs with different diameters and electronic properties. This correlation of transport with Raman spectroscopy illustrates a useful principle for molecular electronics, where an understanding of strong perturbations by environmental effects is required for the interpretation of transport data.