Transport through a vibrating quantum dot: Polaronic effects

Details Transport through a vibrating quantum dot: Polaronic effects Transport through a vibrating quantum dot: Polaronic effects

2010-05-30

arxiv.org/abs/1005.5511v1

J. Phys. Conf. Series 220, 012023 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 8 figures, Proceedings of "Progress in Nonequilibrium Green's Function IV" Conference, Glasgow 2009

Scientific paper

We present a Green's function based treatment of the effects of electron-phonon coupling on transport through a molecular quantum dot in the quantum limit. Thereby we combine an incomplete variational Lang-Firsov approach with a perturbative calculation of the electron-phonon self energy in the framework of generalised Matsubara Green functions and a Landauer-type transport description. Calculating the ground-state energy, the dot single-particle spectral function and the linear conductance at finite carrier density, we study the low-temperature transport properties of the vibrating quantum dot sandwiched between metallic leads in the whole electron-phonon coupling strength regime. We discuss corrections to the concept of an anti-adiabatic dot polaron and show how a deformable quantum dot can act as a molecular switch.

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