Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 3: Inorganic/Organic Interfaces: Growth I
O 3.5: Talk
Monday, March 16, 2015, 11:30–11:45, MA 005
Single photon emission in STM-induced luminescence from fullerene excitons — •Pablo Merino1, Christoph Große1, Klaus Kuhnke1, and Klaus Kern1,2 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany — 2Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Quantum systems like molecules or quantum dots cannot emit two photons at the same time which results in an antibunching of the emitted photon train and a dip in the photon-photon correlation function. Such single photon emitters are key elements for quantum cryptography and their miniaturization to the nanoscale would be desirable. This requires reproducible emitter separations typically below the optical diffraction limit and has imposed strong limitations on suitable structures and materials. In this contribution we demonstrate single photon emission excited locally by a low temperature (4 K) Scanning Tunneling Microscope (STM) and characterized with sub-molecular resolution. Using a Hanbury Brown-Twiss interferometer scheme in STM-induced electroluminescence we discovered that localized trap states in fullerene multilayers form single photon emitters. The emission spectrum is a line spectrum attributable to exciton recombination and from the correlation data, exciton life times as short as 0.25 ns are determined. With increasing tunnel current a saturation of the emission and a change of the correlation function are observed. We will discuss these observations within the frame of a three state kinetic model.