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

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    Prediction of femtosecond oscillations in the transient current of a quantum dot in the Kondo regime.pdf
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    Type
    Article
    Authors
    Goker, Ali
    Manchon, Aurelien cc
    Schwingenschlögl, Udo cc
    Zhu, Zhiyong
    KAUST Department
    Computational Physics and Materials Science (CPMS)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2010-10-11
    Preprint Posting Date
    2010-09-29
    Permanent link to this record
    http://hdl.handle.net/10754/315796
    
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    Abstract
    We 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.
    Citation
    Goker 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.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.82.161304
    arXiv
    1009.5805
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.82.161304
    http://arxiv.org/abs/1009.5805
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.82.161304
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program; Computational Physics and Materials Science (CPMS)

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