Magnetic-field asymmetry of nonlinear transport in carbon nanotubes.
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.
Wei
Jiang
J
Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.
Shimogawa
Michael
M
Wang
Zenghui
Z
Radu
Iuliana
I
Dormaier
Robert
R
Cobden
David Henry
DH