Shot noise in nanoscale conductors from first principles

Yu-Chang Chen, Massimiliano Di Ventra

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

We describe a field-theoretic approach to calculate quantum shot noise in nanoscale conductors from first principles. Our starting point is the second-quantization field operator to calculate shot noise in terms of single quasiparticle wave functions obtained self-consistently within the density-functional theory. The approach is valid in both linear and nonlinear response and is particularly suitable in studying shot noise in atomic-scale conductors. As an example, we study shot noise in Si atomic wires between metal electrodes. We find that shot noise is strongly nonlinear as a function of bias and it is enhanced for one- and two-Si wires due to the large contribution from the metal electrodes. For longer wires it shows an oscillatory behavior for even and odd number of atoms with opposite trend with respect to the conductance, indicating that current fluctuations persist with increasing wire length.

Original languageEnglish
Article number153304
Pages (from-to)1533041-1533044
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number15
DOIs
StatePublished - 28 Apr 2003

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