  Magnetic impurities are responsible for many interesting phenomena in
condensed matter systems, notably the Kondo effect and quantum phase
transitions. Here we present a holographic model of a magnetic impurity that
captures the main physical properties of the large-spin Kondo effect. We
estimate the screening length of the Kondo cloud that forms around the impurity
from a calculation of entanglement entropy and show that our results are
consistent with the g-theorem.
