Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Transport: Graphene and Carbon Nanotubes
TT 26.11: Vortrag
Mittwoch, 25. März 2009, 17:00–17:15, HSZ 03
Band gap engineering of carbon nanotubes using pulsed high magnetic fields — •Sungho Jhang1, Yurii Skourski2, Dominik Preusche1, Joachim Wosnitza2, and Christoph Strunk1 — 1Institute of Experimental and Applied Physics, University of Regensburg, Germany — 2Dresden High Magnetic Field Laboratory, Forschungszentrum Dresden-Rossendorf, Germany
Due to the Aharonov-Bohm (AB) phase generated around the nanotube circumference, the band structure of carbon nanotubes is expected to be strongly influenced by the magnetic field. We report magnetotransport experiments on ballistic carbon nanotubes up to 60 Tesla. We present that the band gap of carbon nanotubes is modulated with the application of magnetic field parallel to the tube axis, and show how initially metallic (or semiconducting) tube evolves into semiconducting(or metallic) tube as we increase the magnetic field. In addition, we find fine structures in the magnetoconductance and explain the phenomena due to the beating effect in the AB interference between clockwise and counterclockwise electronic motions around the tube.