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Blockade and Counterflow Supercurrent in Exciton-Condensate Josephson Junctions

Mon, 2011-02-14 19:42 - Daniel Rudolph
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Date: 
2010-01-14
Author(s): 

Fabrizio Dolcini, Diego Rainis, Fabio Taddei, Marco Polini, Rosario Fazio, and A. H. MacDonald

Reference: 

Phys. Rev. Lett. 104, 027004 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.104.027004

We demonstrate that perfect conversion between charged supercurrents in superconductors and neutral supercurrents in electron-hole pair condensates is possible via a new Andreev-like scattering mechanism. As a result, when two superconducting circuits are coupled through a bilayer exciton condensate, the superflow in both layers is drastically modified. Depending on the phase biases the supercurrents can be completely blocked or exhibit perfect drag.