Prediction of femtosecond oscillations in the transient current of a quantum dot in the Kondo regime

TL;DR

This paper investigates femtosecond oscillations in the transient current of a quantum dot in the Kondo regime, revealing how the density of states influences conductance dynamics and proposing an experimental setup.

Contribution

It introduces a theoretical study of conductance oscillations caused by density of states features in gold contacts within the Kondo regime, using the time-dependent non-crossing approximation.

Findings

Oscillations exhibit beating patterns with frequencies related to Fermi level features.

Temperature and bias reduce the amplitude of conductance oscillations.

Interference between Kondo resonance and van-Hove singularities causes observed oscillations.

Abstract

We invoke the time-dependent non-crossing approximation in order to study the effects of the density of states of gold contacts on the instantaneous conductance of a single electron transistor which is abruply moved into the Kondo regime by means of a gate voltage. For an asymmetrically coupled system, we observe that the instantaneous conductance in the Kondo timescale exhibits beating with distinct frequencies, which are proportional to the separation between the Fermi level and the sharp features in the density of states of gold. Increasing the ambient temperature or bias quenches the amplitude of the oscillations. We attribute the oscillations to interference between the emerging Kondo resonance and van-Hove singularities in the density of state. In addition, we propose an experimental realization of this model.