project title: Electron Transport in Nanotubes
project leader: Sonin
access given (in days): 92
access used (in days): 69
local host:
home institution: Racah Institute of Physics, Hebrew University of Jerusalem
country of institution: IL
starting date (yyyy-mm-dd):
Professor Edouard Sonin is from Hebrew University, Jerusalem, Israel. The goals of his project are: 1. To study various cases of mesoscopic transport in which counting statistics is not Poissonian. Two particular cases that will be considered are a single junction with current bias and two junctions in series. These studies will pave the way for experiments to probe current statistics using on-chip junction probe detectors. 2. To study not only full counting statistics but also full statistics of voltage and phase fluctuation. This is important since the experimentalists have no direct access to counting statistics measuring voltage or phase fluctuations instead of it. 3. To extend the analysis of full statistics, which up to now has been done only in the low-frequency limit, to high frequencies (short times). This will be instrumental in order to analyze practical junction noise detectors in the regime of non-Poissonian noise. 4. To study counting statistics in carbon nanotubes. In addition to counting statistics, cross correlations of current fluctuations will investigated in the light of pinpointing the nature of basic charge carriers in single and multiwalled carbon nanotubes.
Prof.Sonin has worked on the theoretical analysis of noise in strongly correlated systems, like single and multiwalled carbon nanotubes. In addition, he has investigated shot noise in graphene which presents intriguing noise characteristics: due to the evanescent nature of the transport modes, transport is not noiseless even though there is no elastic scattering present. Sonin has conducted a detailed analysis of the current and the shot noise in a graphene sheet in the ballistic regime for arbitrary voltage drops between leads and the sheet. A comparison of coherent and incoherent ballistic transport showed that this difference is not essential at high voltages. But at low voltages, conductance and Fano-factor for incoherent transport become non-monotonous functions of voltage so that the conductance has a minimum and the Fano factor has a maximum at non-zero voltage bias. The results on graphene have been submitted for publication in Phys. Rev. B (