Doyon, B. (2007) 'New method for studying steady states in quantum impurity problems : the interacting resonant level model.', Physical review letters., 99 (7). 076806.
We develop a new perturbative method for studying any steady states of quantum impurities, in or out of equilibrium. We show that steady-state averages are completely fixed by basic properties of the steady-state (Hershfield's) density matrix along with dynamical "impurity conditions". This gives the full perturbative expansion without Feynman diagrams (matrix products instead are used), and "re-sums" into an equilibrium average that may lend itself to numerical procedures. We calculate the universal current in the interacting resonant level model (IRLM) at finite bias V to first order in Coulomb repulsion U for all V and temperatures. We find that the bias, like the temperature, cuts off low-energy processes. In the IRLM, this implies a power-law decay of the current at large V (also recently observed by Boulat and Saleur at some finite value of U).
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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevLett.99.076806|
|Record Created:||09 Jan 2009|
|Last Modified:||02 Aug 2010 16:35|
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