Fig. 1: Channel-isotropic Kondo cloud.
From: Hierarchical entanglement shells of multichannel Kondo clouds
a An impurity spin couples to three channels with equal strengths J1 = J2 = J3. A perturbation B breaks the SU(2) spin symmetry at distance L from the impurity in channel 1. The cloud distribution ρ1(L) in channel 1 is read out from the L dependence of the entanglement \({{{{{{{\mathcal{N}}}}}}}}\) between the impurity and the channels. b Schematic cloud distribution. Crossover between the core and the tail happens around the cloud length ξK. c Numerical renormalization group (NRG) results of ρ1(L) at zero temperature for the isotropic single-channel (1CK), two-channel (2CK), and three-channel Kondo (3CK) effects. d Log–log plot of c. The tail follows the power-law decay L−2Δ in agreement with the boundary conformal field theory (BCFT).
