Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-03-09
Physical Review Letters 99, 076806 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 1 figure. v2: title and abstract modified, more discussion in paper, reference added
Scientific paper
10.1103/PhysRevLett.99.076806
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).
No associations
LandOfFree
New method for studying steady states in quantum impurity problems: The interacting resonant level model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New method for studying steady states in quantum impurity problems: The interacting resonant level model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New method for studying steady states in quantum impurity problems: The interacting resonant level model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-692632