Transient dynamics of the Anderson impurity model out of equilibrium

Physical Review B - Condensed Matter and Materials Physics

Volumn 78, Issue 23, 2008, Pages

  Schmidt, T L ^a   Werner, P ^b,c   Muhlbacher L ^d   Komnik, A ^e  

^a UNIVERSITY OF BASEL   (Switzerland)

^b Och Spine at New York Presbyterian Hospitals   (United States)

^c ETH ZURICH   (Switzerland)

^d UNIVERSITY OF FREIBURG   (Germany)

^e INSTITUT FÜR THEORETISCHE PHYSIK   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 58149175663     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.235110     Document Type: Article

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40. We assume the electrodes to be large enough in order to have a meaningful concept of temperature.
41. At finite temperature the single-particle levels can be considered as broadened, having the typical width of T. That is why it is natural to assume the band boundaries to be widened with η≈T.
42. In imaginary time, the diagrammatic Monte Carlo simulation of the AIM does not encounter a sign problem. All the (fermionic) sign cancellations between crossing and noncrossing diagrams can be absorbed into the determinant of self-energies (hybridization functions), and the imaginary time evolution e- Hloc τ gives a real contribution to the weight. In real-time diagrammatic Monte Carlo, both the self-energies and the time evolution operator are complex.