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Phys Rev Lett. 2001 Sep 3;87(10):106801. Epub 2001 Aug 16.

Quantum interference and ballistic transmission in nanotube electron waveguides.

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Department of Chemistry and Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.


The electron transport properties of well-contacted individual single-walled carbon nanotubes are investigated in the ballistic regime. Phase coherent transport and electron interference manifest as conductance fluctuations as a function of Fermi energy. Resonance with standing waves in finite-length tubes and localized states due to imperfections are observed for various Fermi energies. Two units of quantum conductance 2G(0) = 4e(2)/h are measured for the first time, corresponding to the maximum conductance limit for ballistic transport in two channels of a nanotube.

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