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TT: Fachverband Tiefe Temperaturen
TT 36: TR: Poster Session
TT 36.3: Poster
Thursday, March 25, 2010, 14:00–18:00, Poster A
Transport through a vibrating quantum dot: Polaronic effects — •Thomas Koch1, Jan Loos2, Andreas Alvermann1, Alan Bishop3, and Holger Fehske1 — 1Institute of Physics, Ernst-Moritz-Arndt University Greifswald, 17487 Greifswald, Germany — 2Institute of Physics, Academy of Sciences of the Czech Republic, 16200 Prague, Czech Republic — 3Theory, Simulation and Computation Directorate, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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.