Journal
PHYSICAL REVIEW B
Volume 91, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.241401
Keywords
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Funding
- French program ANR MASH [ANR-12-BS04-0016]
- DYMESYS [ANR 2011-IS04-001-01]
- ANR program [ANR-11-ISO4-005-01]
- GENCI [2014050225]
- Agence Nationale de la Recherche (ANR) [ANR-12-BS04-0016] Funding Source: Agence Nationale de la Recherche (ANR)
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The magnetic state of a quantum dot attached to superconducting leads is experimentally shown to be controlled by the superconducting phase difference across the dot. This is done by probing the relation between the Josephson current and the superconducting phase difference of a carbon nanotube junction whose Kondo energy and superconducting gap are of comparable size. It exhibits distinctively anharmonic behavior, revealing a phase-mediated singlet-to-doublet transition. We obtain an excellent quantitative agreement with numerically exact quantum Monte Carlo calculations. This provides strong support that we indeed observed the finite-temperature signatures of the phase-controlled zero temperature level crossing transition originating from strong local electronic correlations.
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