Real-space structure of the impurity screening cloud in the resonant level model

We present a detailed investigation of the impurity screening cloud in the resonant level model. The screening is visible in the structure of impurity–bath correlators as a function of distance from the impurity. We characterize the screening cloud through scaling analyses of impurity–bath correlators and entanglement entropies. We devise and study several situations where the screening cloud is destroyed or modified: finite temperatures, energetic detuning of the impurity from the chemical potential, and the situation of an unconventional bath with diverging density of states. (paper)