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Current fluctuations of polymeric chains
Author(s) -
Walczak Kamil
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200302036
Subject(s) - shot noise , coupling (piping) , noise (video) , chemisorption , pauli exclusion principle , chain (unit) , electrode , condensed matter physics , current (fluid) , spectral line , crossover , materials science , physics , nonlinear system , molecular physics , chemical physics , chemistry , quantum mechanics , optics , thermodynamics , computer science , adsorption , artificial intelligence , detector , metallurgy , image (mathematics)
Coherent electron transport is investigated in a molecular device made of a polymeric chain sandwiched between two metallic electrodes. The molecular system is described by a simple Hückel model, while the coupling to the electrodes is treated in a broad energy band approach. Transport characteristics and noise power are calculated in two response regimes: linear and non‐linear. A strong dependence is shown of the shot noise on (i) the length of the polymeric chain and (ii) the strength of the molecule‐to‐electrode coupling. In particular, a detailed discussion of Poissonian to sub‐Poissonian crossover in the noise spectra is included. An algorithm is presented that allows one to calculate the lowest possible level of current fluctuations (due to the Pauli exclusion principle) in designing molecular devices. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)