Manipulating the magnetic state of a carbon nanotube Josephson junction using the superconducting phase

Using a cleverly designed device contacting superconducting leads to a carbon nanotube quantum dot, the authors investigate the magnetic state of a quantum dot attached to superconducting leads in a regime where the Kondo energy competes with the superconducting correlations. In this regime, the magnetic state of the system depends on the difference of superconducting phase between the two electrodes. This paper reports the first experimental observation of this effect.