Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Quantum dots and wires: Transport properties I

HL 23.6: Vortrag

Dienstag, 26. Februar 2008, 12:15–12:30, EW 201

Carbon nanotube nano-electromechanics — •Andreas K. Hüttel, Benoit Witkamp, Menno Poot, Samir Etaki, and Herre van der Zant — Molecular Electronics and Devices, Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands

Single wall carbon nanotubes (SW-CNTs) excel in many ways as a nano-electromechanical system. With their high Young’s modulus, extreme flexibility, smoothness on a molecular level, small cross-section and low mass, they promise possibilities of observing the quantization of mechanical motion. In addition, their electronic structure is well-characterized, enabling the identification of mechanical effects.

We present low-temperature transport measurements targetting both the longitudinal (stretching) and the transversal (bending) vibration mode of suspended SW-CNTs. Data on low-bias current suppression in short (100nm) CNT quantum dots points towards “phonon” or “distortion” blockade mechanisms. In addition, indications of mechanical modes in higher-order tunneling are shown. Different sample geometries and fabrication techniques are discussed.