Prediction of femtosecond oscillations in the transient current of a quantum dot in the Kondo regime
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Computational Physics and Materials Science (CPMS)
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AbstractWe invoke the time-dependent noncrossing 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 abruptly 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 time scale 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.
CitationGoker A, Zhu ZY, Manchon A, Schwingenschlögl U (2010) Prediction of femtosecond oscillations in the transient current of a quantum dot in the Kondo regime. Phys Rev B 82. doi:10.1103/PhysRevB.82.161304.
PublisherAmerican Physical Society (APS)
JournalPhysical Review B