title: Magnetic-field asymmetry of nonlinear transport in carbon nanotubes.
abstract: We demonstrate that nonlinear electrical transport through a two-terminal nanoscale sample is not symmetric in the magnetic field B. More specifically, we have measured the lowest order B-asymmetric terms in single-walled carbon nanotubes. Theoretically, these terms can be used to infer both the strength of electron-electron interactions and the handedness of the nanotube. Consistent with theory, we find that at high temperatures the B-linear term is small and has a constant sign independent of Fermi energy, while at low temperatures it develops mesoscopic fluctuations. We also find surprising magnetoresistance at zero bias in the metallic regime.
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.
authors.forename: Jiang
authors.initials: J
authors.lastname: Wei
authors.forename: Michael
authors.initials: M
authors.lastname: Shimogawa
authors.forename: Zenghui
authors.initials: Z
authors.lastname: Wang
authors.forename: Iuliana
authors.initials: I
authors.lastname: Radu
authors.forename: Robert
authors.initials: R
authors.lastname: Dormaier
authors.forename: David Henry
authors.initials: DH
authors.lastname: Cobden