منابع مشابه
Very low shot noise in carbon nanotubes
We have performed noise measurements on suspended ropes of single wall carbon nanotubes (SWNT) between 1 and 300 K for different values of dc current through the ropes. We find that the shot noise is suppressed by more than a factor 100 compared to the full shot noise 2eI. We have also measured an individual SWNT and found a level of noise which is smaller than the minimum expected. Another fin...
متن کاملEffects of decoherence on the shot noise in carbon nanotubes
We study the zero frequency noise in an interacting quantum wire connected to leads, in the presence of an impurity. In the absence of quasiparticle decoherence the zerofrequency noise is that of a non-interacting wire. However, if the collective, fractionallycharged modes have a finite lifetime, we find that the zero-frequency noise may still exhibit signatures of charge fractionalization, suc...
متن کاملShot noise with interaction effects in single-walled carbon nanotubes.
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 ...
متن کاملMeasurements of Shot Noise in Single Walled Carbon Nanotubes
We have measured shot noise in single walled carbon nanotubes (SWNT) at 4.2K over frequencies / = 600 850 MHz. Here we report results obtained on shot noise without DC bias by applying an AC modulation at <»o and recording the noise variation at 2(OQ\ the Fano factor is obtained by extrapolating down to zero excitation amplitude. We also discuss the applicability of this method in samples which...
متن کامل1Õf noise in carbon nanotubes
The electrical noise characteristics of single-walled carbon nanotubes have been investigated. For all three cases of individual isolated nanotubes, thin films of interconnected nanotubes, and bulk nanotube mats, anomalously large bias-dependent 1/f noise is found. The noise magnitude greatly exceeds that commonly observed in metal films, carbon resistors, or even carbon fibers with comparable ...
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ژورنال
عنوان ژورنال: The European Physical Journal B
سال: 2002
ISSN: 1434-6028,1434-6036
DOI: 10.1140/epjb/e2002-00223-9