Regensburg 2010 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 7: SC: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 7.14: Talk

Monday, March 22, 2010, 17:45–18:00, H20

The Josephson light-emitting diode — •Patrik Recher¹, Yuli Nazarov², and Leo Kouwenhoven² — ¹Institut für Theoretische Physik und Astrophysik, University of Würzburg, 97074 Würzburg, Germany — ²Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands

We consider an optical quantum dot where an electron level and a hole level are coupled to respective superconducting leads. We find that electrons and holes recombine producing photons at discrete energies as well as a continuous tail. Further, the spectral lines directly probe the induced superconducting correlations on the dot. At energies close to the applied bias voltage eV_sd, a parameter range exists, where radiation proceeds in pairwise emission of polarization correlated photons. At energies close to 2eV_sd, emitted photons are associated with Cooper pair transfer and are reminiscent of Josephson radiation. We discuss how to probe the coherence of these photons in a SQUID geometry via single photon interference.