Figure 4: Two-impurity Kondo screening phase.
From: Exploring the phase diagram of the two-impurity Kondo problem

(a,b) Differential conductance spectra for the {0, 2} and the {3/2, 1/2} dimer, respectively, around the critical field of each pair. (c) Phase diagram of the two-impurity Kondo problem showing the locations of performed measurements; white markers refer to panels a,b. The data points marked with a square indicate the presence of a Kondo resonance. The solid line marks the position of the ground state degeneracy.