Molecular transistor coupled to phonons and Luttinger-liquid leads

Details Molecular transistor coupled to phonons and Luttinger-liquid leads Molecular transistor coupled to phonons and Luttinger-liquid leads

2004-12-27

arxiv.org/abs/cond-mat/0412710v1

Phys. Rev. B 72, 075337 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 11 figures

Scientific paper

10.1103/PhysRevB.72.075337

We study the effects of electron-phonon interactions on the transport properties of a molecular quantum dot coupled to two Luttinger-liquid leads. In particular, we investigate the effects on the steady state current and DC noise characteristics. We consider both equilibrated and unequilibrated on-dot phonons. The density matrix formalism is applied in the high temperature approximation and the resulting semi-classical rate equation is numerically solved for various strengths of electron-electron interactions in the leads and electron-phonon coupling. The current and the noise are in general smeared out and suppressed due to intralead electron interaction. On the other hand, the Fano factor, which measures the noise normalized by the current, is more enhanced as the intralead interaction becomes stronger. As the electron-phonon coupling becomes greater than order one, the Fano factor exhibits super-Poissonian behaviour.

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