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Abstract

We show that the band structure of metallic carbon nanotubes can be
dramatically altered by the local electrostatic field. This is realized
by coupling chemically functionalized nanotubes to form T junctions.
The bar of the T is the conducting channel and the leg of the T is used
for local gating. Transport measurements reveal that an energy gap
develops upon application of a local electric field in both devices
with or without linker molecules at the junction. We propose that the
mechanism of the band gap modulation in the T junctions without linker
molecules is the field effect, with the linker molecules introducing
additional electromechanical and chemical effects.