Shot Noise with Interaction Effects in Single Walled Carbon Nanotubes
F. Wu, P. Queipo, T. Tsuneta, T. H. Wang, E. Kauppinen, P. J., Hakonen
TL;DR
This study measures shot noise in single-walled carbon nanotubes at low temperatures, revealing modulation patterns linked to Fabry-Perot interference and analyzing the effects of transmission modes without observing Luttinger liquid behavior.
Contribution
It provides experimental data on shot noise modulation in SWNTs and analyzes the effects of interaction and transmission modes, challenging Luttinger liquid expectations.
Findings
Shot noise varies with Fabry-Perot pattern
Differential Fano factor ranges from 0.4 to 1.2
No power law dependence indicative of Luttinger liquids
Abstract
We have measured shot noise in single walled carbon nanotubes (SWNT) with good contacts at 4.2 K at low frequencies ( MHz). We find a strong modulation of shot noise over the Fabry-Perot pattern; in terms of 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. No power law dependence of shot noise, as expected for Luttinger liquids, was found in our measurements.
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