title: Single carbon nanotube transistor at GHz frequency.
abstract: We report on microwave operation of top-gated single carbon nanotube transistors. From transmission measurements in the 0.1-1.6 GHz range, we deduce device transconductance gm and gate-nanotube capacitance Cg of micro- and nanometric devices. A large and frequency-independent gm approximately 20 microS is observed on short devices, which meets the best dc results. The capacitance per unit gate length of 60 aF/microm is typical of top gates on a conventional oxide with epsilon approximately 10. This value is a factor of 3-5 below the nanotube quantum capacitance which, according to recent simulations, favors high transit frequencies fT=gm/2piCg. For our smallest devices, we find a large fT approximately 50 GHz with no evidence of saturation in length dependence.
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France.
authors.forename: J
authors.initials: J
authors.lastname: Chaste
authors.forename: L
authors.initials: L
authors.lastname: Lechner
authors.forename: P
authors.initials: P
authors.lastname: Morfin
authors.forename: G
authors.initials: G
authors.lastname: Fève
authors.forename: T
authors.initials: T
authors.lastname: Kontos
authors.forename: J-M
authors.initials: JM
authors.lastname: Berroir
authors.forename: D C
authors.initials: DC
authors.lastname: Glattli
authors.forename: H
authors.initials: H
authors.lastname: Happy
authors.forename: P
authors.initials: P
authors.lastname: Hakonen
authors.forename: B
authors.initials: B
authors.lastname: Plaçais
mesh_terms: D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008839:Microelectrodes; D008872:Microwaves; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D013499:Surface Properties; D014173:Transistors, Electronic
chemical_list: D046911:Macromolecular Substances; D037742:Nanotubes, Carbon