Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 46: Quantum Dots and Wires: Transport

HL 46.4: Vortrag

Mittwoch, 24. März 2010, 14:45–15:00, H17

Electron-phonon interaction in a triple quantum dot interferometer — •Fernando Dominguez and Gloria Platero — Instituto de ciencia de materiales de Madrid (ICMM)

In this work we analyze the effect of electron-phonon interaction on the electronic transport through a triple quantum dot in closed loop configuration. We consider that one of the quantum dots contains a mechanical degree of freedom, while the rest are fixed to the electronic leads. Under appropriate energetic conditions and in the absence of the electron-phonon interaction, an electron becomes coherently trapped in the system. As the electron-phonon interaction is switched on, the mechanical degree of freedom interacts with the electronic charge in the oscillating quantum dot. Thus, the interaction acts on the system as a "which path" detector, leading to the destruction of the coherent superposition, i.e., of the dark state, giving rise to current. By means of the Generalized Density Matrix formalism, we calculate the current density and the shot noise.