Dissipative Kondo physics in the Anderson impurity model with two-body losses
Phys. Rev. B 114, 115110 – Published 14 August, 2026
DOI: https://doi.org/10.1103/hjqj-7dxz
Abstract
We study a dissipative version of the Anderson Impurity model, where an interacting impurity is coupled to a fermionic reservoir and exposed to Markovian dissipation in the form of two-body losses. Using a self-consistent hybridization expansion based on the noncrossing approximation (NCA), we compute the dynamics of the impurity, its steady state, and a spectral function. We show that the interplay between strong Coulomb repulsion and correlated dissipation gives rise to robust signatures of Kondo physics both at weak and strong losses. These include a strongly suppressed spin relaxation rate, displaying a characteristic Kondo-Zeno crossover, and a spectral function where the doublon band is quickly destroyed by dissipation while the coherent Kondo peak remains visible for weak losses, then disappears at intermediate values and finally re-emerges as the system enters the Kondo-Zeno regime. As compared to the case of single-particle losses, we show that two-body dissipation protects Kondo physics. The picture obtained with NCA is confirmed by numerical simulations of exact dynamics on finite-size chains. We interpret these results using a dissipative Schrieffer-Wolff transformation, which leads to an effective Kondo model with residual impurity-bath losses, which are suppressed by strong correlations or strong losses.
