Next week's seminar

[CM ICTP - Trieste]

JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR



Tuesday, 16 December    -    12:30 hrs.





Seminar Room,  ICTP Leonardo Building - 1st floor





N. ANDREI   ( Rutgers University, Piscataway )



" Quantum impurities out-of-equilibrium "



Abstract



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  
eigenstates defined 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 compute the conductance G(V ; e_d), noting the formation  
of the Kondo peak as the gate voltage e_d is decreased, and the peak  
destruction as the source-drain voltage V is increased.