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

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.

4 pages, 4 figures

References in corpus (10)

• Single-shot read-out of an individual electron spin in a quantum dot
• An On-Demand Coherent Single Electron Source
• Real-time dynamics in Quantum Impurity Systems: A Time-dependent Numerical Renormalization Group Approach
• Diagrammatic Monte Carlo simulation of non-equilibrium systems
• Continuous-time auxiliary field Monte Carlo for quantum impurity models
• Spin Precession and Real Time Dynamics in the Kondo Model: A Time-Dependent Numerical Renormalization-Group Study
• Nonequilibrium current driven by a step voltage pulse: an exact solution
• Transient dynamics of the Anderson impurity model out of equilibrium
• Electronic structure of the c(4 x 2) reconstructed Ge(001) surface
• Transient current in a quantum dot asymmetrically coupled to metallic leads

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