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Magnetic-field asymmetry of nonlinear transport in carbon nanotubes
Authors:Wei Jiang  Shimogawa Michael  Wang Zenghui  Radu Iuliana  Dormaier Robert  Cobden David Henry
Institution:Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.
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.
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