title: Time-resolved picosecond photocurrents in contacted carbon nanotubes.
abstract: We introduce coplanar stripline circuits to resolve the ultrafast photocurrent dynamics of freely suspended carbon nanotubes (CNTs) in the time domain. By applying an on-chip pump-probe laser spectroscopy, we demonstrate that CNTs, contacted by metal electrodes, exhibit a picosecond photocurrent response. We find a combination of an optically induced ultrafast displacement current, transport of photogenerated charge carriers at the Fermi velocity to the electrodes, and interband charge-carrier recombination processes to dominate the ultrafast photocurrent of the CNTs.
authors.affiliation: Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4, D-85748 Garching, Germany.
authors.forename: Leonhard
authors.initials: L
authors.lastname: Prechtel
authors.forename: Li
authors.initials: L
authors.lastname: Song
authors.forename: Stephan
authors.initials: S
authors.lastname: Manus
authors.forename: Dieter
authors.initials: D
authors.lastname: Schuh
authors.forename: Werner
authors.initials: W
authors.lastname: Wegscheider
authors.forename: Alexander W
authors.initials: AW
authors.lastname: Holleitner