Speaker
Description
We investigate the time evolution of Kondo systems following a quench in the Hamiltonian parameters. In the case of the single-channel Kondo model coupled to a normal metallic bath, we identify universal behavior in the Loschmidt echo, with the characteristic time scale set by the inverse Kondo temperature. For the two-channel Kondo model, we analyze quenches that drive the system toward a non-Fermi liquid state and examine the corresponding dynamical features. Finally, we consider a magnetic impurity coupled to an s-wave superconducting bath. We predict that superconducting correlations strongly suppress deviations from the initial doublet state and hinder the dynamical formation of the Kondo singlet. Rich dynamical behavior also emerges near the quantum critical point, where the return rate function exhibits signatures of a dynamical quantum phase transition.
