Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-26
Phys. Rev. B 81, 125122 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
We investigate equilibrium and steady-state non-equilibrium transport properties of a spinless resonant level locally coupled to two conduction bands of width ~\Gamma via a Coulomb interaction U and a hybridization t'. In order to study the effects of finite bias voltages beyond linear response, a generalization of the functional renormalization group to Keldysh frequency space is employed. Being mostly unexplored in the context of quantum impurity systems out of equilibrium, we benchmark this method against recently-published time-dependent density matrix renormalization group data. We thoroughly investigate the scaling limit \Gamma\to\infty characterized by the appearance of power laws. Most importantly, at the particle-hole symmetric point the steady-state current decays like J ~ V^{-\alpha_J} as a function of the bias voltage V>>t', with an exponent \alpha_J(U) that we calculate to leading order in the Coulomb interaction strength. In contrast, we do not observe a pure power-law (but more complex) current-voltage-relation if the energy \epsilon of the resonant level is pinned close to either one of the chemical potentials \pm V/2.
Borda Laszlo
Karrasch Christoph
Meden Volker
Pletyukhov Mikhail
No associations
LandOfFree
Functional renormalization group study of the interacting resonant level model in and out of equilibrium 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 Functional renormalization group study of the interacting resonant level model in and out of equilibrium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Functional renormalization group study of the interacting resonant level model in and out of equilibrium will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-194860