We present an atomistic self-consistent study of the electronic and transportproperties of semiconducting carbon nanotube in contact with metal electrodesof different work functions, which shows simultaneous electron and hole dopinginside the nanotube junction through contact-induced charge transfer. We findthat the band lineup in the nanotube bulk region is determined by the effectivework function difference between the nanotube channel and source/drainelectrodes, while electron transmission through the SWNT junction is affectedby the local band structure modulation at the two metal-nanotube interfaces,leading to an effective decoupling of interface and bulk effects in electrontransport through nanotube junction devices.
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