Frequency-dependent transport through a quantum dot in the Kondo regime

Details Frequency-dependent transport through a quantum dot in the Kondo regime Frequency-dependent transport through a quantum dot in the Kondo regime

2004-06-14

arxiv.org/abs/cond-mat/0406312v2

PRL, 94, 196602 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.196602

We study the AC conductance and equilibrium current fluctuations of a Coulomb blockaded quantum dot. A relation between the equilibrium spectral function and the linear AC conductance is derived which is valid for frequencies well below the charging energy of the quantum dot. Frequency-dependent transport measurements can thus give experimental access to the Kondo peak in the equilibrium spectral function of a quantum dot. We illustrate this in detail for typical experimental parameters using the numerical renormalization group method in combination with the Kubo formalism.

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