Phase controlled superconducting proximity effect probed by tunneling spectroscopy

Hélène Le Sueur (1) , P. Joyez (1) , H. Pothier (1) , C. Urbina (1) , Daniel Esteve (1)

1 QUANTRONICS - Quantronics Group

Using a dual-mode STM-AFM microscope operating below 50mK we measured the Local Density of States (LDoS) along small normal wires connected at both ends to superconductors with different phases. We observe that a uniform minigap can develop in the whole normal wire and in the superconductors near the interfaces. The minigap depends periodically on the phase difference. The quasiclassical theory of superconductivity applied to a simplified 1D model geometry accounts well for the data.

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Hélène Le Sueur, P. Joyez, H. Pothier, C. Urbina, Daniel Esteve. Phase controlled superconducting proximity effect probed by tunneling spectroscopy. Physical Review Letters, 2008, 100 (19), pp.197002. ⟨10.1103/PhysRevLett.100.197002⟩. ⟨hal-00273401⟩