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Condensed Matter Seminars

ics Special Condensed Matter
Monday, March 26, 2001
4:00 PM
Physics Building, Room 204
Note special date.
Note special time.
Note special room.
David Cobden [Host: Despina Louca]
Univ. of Warwick
"Carbon nanotube quantum wires and quantum dots"
ABSTRACT:
Recent experiments on transport through individual single-wall carbon nanotubes with electrical contacts have shown that a broad range of physical phenonema can occur in such molecular-electronic devices [1,2]. I will review our present understanding of metallic nanotubes as interacting quantum wires and dots, with more emphasis on the quantum dot regime. As a result of the one-dimensional (1D) band structure, the spectral characteristics of nanotube dots are in informative contrast with those of dots formed in other systems having 2D or 3D bands. Also, these 1D quantum dots are preserved, effectively floating in vacuum, when the substrate beneath the tubes is etched away. In the resulting tightrope geometry we can begin to study the interplay of the molecule's electronic properties with a wide range of environmental factors. Finally, having achieved surprisingly good electrical contacts between the metal leads and tubes, we find that nanotube dots prove to be an excellent system for studying new aspects of Kondo physics. [1] Cees Dekker, "Carbon Nanotubes as Molecular Quantum Wires". Physics Today 52, 22-28 (1999). [2] Paul McEuen and others, Special reports in Physics World vol 13 issue 6 (June 2000).

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