AC-Conductance through an Interacting Quantum Dot

Details AC-Conductance through an Interacting Quantum Dot AC-Conductance through an Interacting Quantum Dot

2009-10-15

arxiv.org/abs/0910.2844v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 4 figures

Scientific paper

We investigate the linear ac-conductance for tunneling through an arbitrary interacting quantum dot in the presence of a finite dc-bias. In analogy to the well-known Meir-Wingreen formula for the dc case, we are able to derive a general formula for the ac-conductance. It can be expressed entirely in terms of local correlations on the quantum dot, in the form of a Keldysh block diagram with four external legs. We illustrate the use of this formula as a starting point for diagrammatic calculations by considering the ac-conductance of the noninteracting resonant level model and deriving the result for the lowest order of electron-phonon coupling. We show how known results are recovered in the appropriate limits.

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