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Göteborgs universitets publikationer

Time-dependent and steady-state Gutzwiller approach for nonequilibrium transport in nanostructures

Författare och institution:
N. Lanata (-); Hugo Strand (Institutionen för fysik (GU))
Publicerad i:
Physical Review B, 86 ( 11 ) s. Article number115310
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
We extend the time-dependent Gutzwiller variational approach, recently introduced by Schiro and Fabrizio [Phys. Rev. Lett. 105, 076401 (2010)], to impurity problems. Furthermore, we derive a consistent theory for the steady state, and show its equivalence with the previously introduced nonequilibrium steady-state extension of the Gutzwiller approach. The method is shown to be able to capture dissipation in the leads, so that a steady state is reached after a sufficiently long relaxation time. The time-dependent method is applied to the single-orbital Anderson impurity model at half filling, modeling a quantum dot coupled to two leads. In these exploratory calculations, the Gutzwiller projector is limited to act only on the impurity. The strengths and the limitations of this approximation are assessed via comparison with state-of-the-art continuous-time quantum Monte Carlo results. Finally, we discuss how the method can be systematically improved by extending the region of action of the Gutzwiller projector.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Fysik ->
Den kondenserade materiens fysik ->
Mesoskopisk fysik
quantum dots, statistical-mechanics, renormalization-group, impurity, model
Ytterligare information:
Article number115310
Postens nummer:
Posten skapad:
2012-10-12 17:20
Posten ändrad:
2012-11-12 15:42

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