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Real-time effective-action approach to the Anderson quantum dot

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The nonequilibrium time evolution of an Anderson quantum dot is investigated. The quantum dot is coupled between two leads forming a chemical-potential gradient. We use Kadanoff-Baym dynamic equations within a nonperturbative resummation of the s-channel bubble chains. The effect of the resummation...

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Main Authors: Sexty, Dénes (Author) , Gasenzer, Thomas (Author) , Pawlowski, Jan M. (Author)
Format: Article (Journal)
Language:English
Published: 22 April 2011
In: Physical review. B, Condensed matter and materials physics
Year: 2011, Volume: 83, Issue: 16
ISSN:1550-235X
DOI:10.1103/PhysRevB.83.165315
Online Access:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.83.165315
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.83.165315
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Author Notes:Dénes Sexty, Thomas Gasenzer, and Jan Pawlowski

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520 |a The nonequilibrium time evolution of an Anderson quantum dot is investigated. The quantum dot is coupled between two leads forming a chemical-potential gradient. We use Kadanoff-Baym dynamic equations within a nonperturbative resummation of the s-channel bubble chains. The effect of the resummation leads to the introduction of a frequency-dependent four-point vertex. The tunneling to the leads is taken into account exactly. The method allows the determination of the transient as well as stationary transport through the quantum dot, and results are compared with different schemes discussed in the literature (functional renormalization group, iterative real-time summation of the path integral, time-dependent matrix renormalization group, and quantum Monte Carlo methods). 
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