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TT: Fachverband Tiefe Temperaturen

TT 8: Postersession Transport: Graphene and Carbon Nanotubes

TT 8.6: Poster

Montag, 23. März 2009, 13:00–16:45, P1B

Scattering dynamics in intra-nanotube quantum dots — •Dario Bercioux¹, Gilles Buchs^2,3, Pascal Ruffieux³, Pierangelo Gröning³, Hermann Grabert¹, and Oliver Gröning³ — ¹Physikalisches Institut and Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany — ²Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands — ³EMPA Swiss Federal Laboratories for Materials, Testing and Research, nanotech@surfaces, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland

Room temperature active intratube quantum dots in metallic single-walled carbon nanotubes are realized by means of low dose medium energy Ar⁺ irradiation. With this low invasive method defect-induced confinement regions of the order of, or shorter than, 10 nm are produced which are demonstrated to lead to particle-in-a-box-like states with energy separations up to 200 meV, hardly achievable with nowadays’ lithography processes. Fourier-transform scanning tunneling spectroscopy compared to results of a Fabry-Pérot electron resonator model yields clear signatures for inter- and intra-valley scattering of electrons confined between consecutive defects. [1] G. Buchs et al. arXiv:0812.3883v1 [cond-mat.mes-hall]