title: Band-structure modulation in carbon nanotube T junctions.
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.
authors.affiliation: Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. chiu@fkf.mpg.de
authors.forename: Po-Wen
authors.initials: PW
authors.lastname: Chiu
authors.forename: Martti
authors.initials: M
authors.lastname: Kaempgen
authors.forename: Siegmar
authors.initials: S
authors.lastname: Roth