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

• Verfasst von: Sexty, Dénes [VerfasserIn]
• Verfasst von: Gasenzer, Thomas [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Titel: Real-time effective-action approach to the Anderson quantum dot
• Verf.angabe: Dénes Sexty, Thomas Gasenzer, and Jan Pawlowski
• Fussnoten: Gesehen am 01.12.2017
• Titel Quelle: Enthalten in: Physical review / B
• Jahr Quelle: 2011
• Band/Heft Quelle: 83(2011,16) Artikel-Nummer 165315, 12 Seiten
• ISSN Quelle: 1550-235X
• DOI: doi:10.1103/PhysRevB.83.165315
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565922778

Abstract

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).