Wu F, Queipo P, Nasibulin A, Tsuneta T, Wang T H, Kauppinen E, Hakonen P J
Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, 02015 HUT, Espoo, Finland.
Phys Rev Lett. 2007 Oct 12;99(15):156803. doi: 10.1103/PhysRevLett.99.156803. Epub 2007 Oct 11.
We have measured shot noise in single-walled carbon nanotubes with good contacts at 4.2 K at low frequencies (f=600-850 MHz). We find a strong modulation of shot noise over the Fabry-Perot pattern; in terms of the differential Fano factor the variation ranges over 0.4-1.2. The shot noise variation, in combination with differential conductance, is analyzed using two (spin-degenerate) modes with different, energy-dependent transmission coefficients. Deviations from the predictions from Landauer-Buttiker formalism are assigned to electron-electron interactions.
