Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: SC: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence
TT 7.14: Vortrag
Montag, 22. März 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 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.