Kondo temperature for a quantum dot in an Aharanov-Bohm ring
  We study the Kondo temperature of a quantum dot embedded into one arm of an Aharonov-Bohm interferometer. The topology of a disordered or chaotic Aharanov-Bohm ring leads to a stochastic term in the scaling equation and in the renormalization procedure. As a result, the Kondo temperature displays significant fluctuations as a function of magnetic flux. 
C. H. Lewenkopf and H. A. Weidenmueller