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Details of Grant 

EPSRC Reference: GR/R67521/01
Title: Carbon Based Electronics - Quantized Adiabatic Charge Transport in Carbon Nanotubes
Principal Investigator: Smith, Professor CG
Other Investigators:
Talyanskii, Dr V Simons, Professor BD Pepper, Professor Sir M
Researcher Co-Investigators:
Project Partners:
Department: Physics
Organisation: University of Cambridge
Scheme: Standard Research (Pre-FEC)
Starts: 01 October 2002 Ends: 30 September 2005 Value (£): 284,366
EPSRC Research Topic Classifications:
Condensed Matter Physics Electronic Devices & Subsys.
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:  
Summary on Grant Application Form
The aim of this proposal is to realise a novel macroscopic quantum phenomenon-quantized adiabatic charge transport (QACT). This effect is manife as a flow of dissipationless quantized current under the action of an external RF or microwave perturbation. The quantized current flows in complete filled bands under the Fermi level, and in this respect the QACT is reminiscent of superconductivity and the quantum Hall effect. Previously, it has been suggested to look for the QACT in one-dimensional semiconductor systems. Here we propose that a semi-metallic carbon nanotubes coupled to surface acoustic wave (SAW) provides an ideal platform to observe and study this effect. We will assemble devices in which a nanotube is place between two metallic contacts on the surface of a piezoelectric substrate. Electric field of a SAW propagating on the substrate will penetrate the tub Electron diffraction on the sliding SAW potential breaks the electron spectrum of the tube into minibands. If the Fermi level is positioned within the minigap then quantized current I-nef (e is the electron charge, f is the SAW frequency, n is an integer) will flow along the tube. It is anticipated that current standard based on QACT will be as accurate as voltage and resistance standards based on Josephson and the quantum Hall effecl respectively. The successful execution of this program will impact at a fundamental level and bring about devices whose active element consists of single molecule.
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Organisation Website: http://www.cam.ac.uk