Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-06-27
Phys. Rev. B 82, 125124 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 4 figures
Scientific paper
Transient and steady state currents through dc-biased quantum impurity models beyond the linear response regime are of considerable interest, both from an experimental and a theoretical point of view. Here we present a new analytical approach for the calculation of such currents based on the flow equation method (method of infinitesimal unitary transformations). Specifically, we analyze the Anderson impurity model in its mixed valence regime where the coupling to the leads is switched on suddenly at time $t=0$. We observe the real time buildup of the current until it reaches its steady state limit.
Kehrein Stefan
Wang Pei
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