Tunable Kondo physics in a carbon nanotube double quantum dot
  We investigate a tunable two-impurity Kondo system in a strongly correlated carbon nanotube double quantum dot, accessing the full range of charge regimes. In the regime where both dots contain an unpaired electron, the system approaches the two-impurity Kondo model. At zero magnetic field the interdot coupling disrupts the Kondo physics and a local singlet state arises, but we are able to tune the crossover to a Kondo screened phase by application of a magnetic field. All results show good agreement with a numerical renormalization group study of the device. 
S. J. Chorley, M. R. Galpin, F. W. Jayatilaka, C. G. Smith, D. E.   Logan, M. R. Buitelaar
cond-mat.mes-hall cond-mat.str-el