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Regensburg 2010 – scientific programme

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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 Kouwenhoven21Institut 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 eVsd, a parameter range exists, where radiation proceeds in pairwise emission of polarization correlated photons. At energies close to 2eVsd, 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.

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