  Thermoelectric power (TEP) of individual single walled carbon nanotubes
(SWNTs) has been measured at mesoscopic scales using a microfabricated heater
and thermometers. Gate electric field dependent TEP-modulation has been
observed. The measured TEP of SWNTs is well correlated to the electrical
conductance across the SWNT according to the Mott formula. At low temperatures,
strong modulations of TEP were observed in the single electron conduction
limit. In addition, semiconducting SWNTs exhibit large values of TEP due to the
Schottky barriers at SWNT-metal junctions.
