Department of Physics and Yale Quantum Institute: Physics Club: Hugues Pothier, CEA-Saclay, France, “Superconductivity in one-atom contacts”

Event time: 
Monday, February 13, 2017 - 3:30pm to 4:30pm
Sloane Physics Laboratory (SPL), 57 See map
217 Prospect St.
New Haven, CT 06511
(Location is wheelchair accessible)
Event description: 

Superconductors are characterized by a dissipationless current. Since the work of Josephson in 1962, it is known that a supercurrent can even flow through tunnel junctions between superconductors. This Josephson effect occurs in fact through any type of “weak link” between superconductors (a piece of non-superconducting material, a constriction …), but also in superfluids or Bose-Einstein condensates.
Although Josephson junctions have a broad range of applications, the usual description relying on the Josephson relations is in fact incomplete. The modern description of the Josephson effect, based on mesoscopic physics, shows that the junctions dynamics depends on an internal degree of freedom that has till very recently remained unexplored.

I will present experiments probing this physics, performed with the smallest possible junctions: one-atom contacts.