Abstract
We consider a quantum wire double junction system with each wire segment described by aspinless Luttinger model, and study theoretically shot noise in this system in the sequentialtunnelling regime. We find that the non-equilibrium plasmonic excitations in the centralwire segment give rise to qualitatively different behaviour compared to the case withequilibrium plasmons. In particular, shot noise is greatly enhanced by them, and exceedsthe Poisson limit. We show that the enhancement can be explained by the emergence ofseveral current-carrying processes, and that the effect disappears if the channelseffectively collapse to one because of fast plasmon relaxation processes, for example.
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