Effect of the Coulomb repulsion on the {\it ac} transport through a quantum dot

TL;DR

This paper investigates how Coulomb repulsion affects the ac transport properties of a quantum dot, revealing new features in frequency-dependent conductance due to electron correlations.

Contribution

It models electron interactions with an Anderson Hamiltonian to analyze their impact on quantum dot admittance in linear response.

Findings

Identification of a new feature in frequency dependence of conductance

Discovery of two crossover frequencies between capacitive and inductive behavior

Discussion of experimental implications of electron correlation effects

Abstract

We calculate in a linear response the admittance of a quantum dot out of equilibrium. The interaction between two electrons with opposite spins simultaneously residing on the resonant level is modeled by an Anderson Hamiltonian. The electron correlations lead to the appearence of a new feature in the frequency dependence of the conductance. For certain parameter values there are two crossover frequencies between a capacitive and an inductive behavior of the imaginary part of the admittance. The experimental implications of the obtained results are briefly discussed.