Fabrizio Dolcini
Exciton condensate / superconductor junctions
The terms superconductivity and superfluidity refer to dissipationless flow in charged and neutral systems, respectively. In Superconductors a macroscopic phase coherence is established among Cooper pairs, made up of electrons with opposite momenta and spin. In Superfluid exciton condensates, macroscopic phase coherence is established among pairs composed of electrons and holes in different bands, and have have been realized only recently.
References
F. Dolcini, D. Rainis, F. Taddei, M. Polini, R. Fazio, and A. H. MacDonald, Blockade and Counterflow Supercurrent in exciton-condensate Josephson junctions, Phys. Rev. Lett. 104, 027004 (2010).
Converting Josephson current into excitonic current
In collaboration with Prof. A. H. MacDonald (Austin University, Texas), and the Research Group of Prof. R. Fazio at Scuola Normale Superiore in Pisa (Italy), we have demonstrated 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 (Exciton Blockade) or exhibit perfect drag (Superdrag) .
Applied techniques
Bogolubov de Gennes Equations
