University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Thursday, February 5th 2009
1:25 pm:
Condensed Matter Seminar in 210 Physics
Speaker: Natan Andrei - Rutgers University
Subject: Quantum Impurities Out-of-Equilibrium

We develop an exact non-perturbative framework to compute the nonequilibrium steady state properties
of quantum impurities connected to leads subject to source-drain voltage. We show that in the open system limit the
non-equilibrium physics is captured by open system eigenstates de¯ned with boundary conditions set by the leads.
The eigenstates are current carrying and entropy producing, with the dissipation inherent in the limit.
We construct these eigenstates by means of a recently introduced Scattering (or Open) Bethe Ansatz approach, a
generalization to nonequilibrium of the Thermodynamic (or Closed) Bethe Ansatz. We compute the I(V) curve of the
Interacting Resonance Level and observe a Fermi Edge Singularity out of equilibrium as the impurity level approaches
resonance. We then apply the approach to the quantum dot (the nonequilibrium Anderson Impurity model) and
observe the formation of the Kondo peak as the gate voltage is decreased and the peak destruction as the source-drain
voltage is increased.

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