Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 27: New Twists for Nanoquakes on a Chip - Emerging Applications of Surface Acoustic Waves in Condensed Matter Physics (Focussed Session): Session I
DS 27.7: Vortrag
Donnerstag, 15. März 2018, 12:15–12:30, H 2032
Development of a SAW-driven source of single photons — •A. Rubino1, T-K Hsiao1, Y. Chung1, S-K Son1, H. Hou1, A. Nasir2, J Pedros3, R. T. Phillips1, G. Éthier-Majcher1, M. Stanley1, M. Atatüre1, K. Niang1, G. Rughoobur1, A. Flewitt1, T. Mitchell1, J. P. Griffiths1, I. Farrer1, D. A. Ritchie1, and C. J. B. Ford1 — 1U. of Cambridge — 2The National Physical Laboratory (NPL) — 3Universidad Politécnica de Madrid
We have developed devices in which both electrons and holes can be induced in an undoped GaAs/AlGaAs well by gates to form a lateral n-i-p junction. SAWs, generated by a transducer, collect electrons in the n-region and transport them into the p-region where they recombine with holes. If the stream is composed of single electrons, the recombination with holes should produce a stream of single photons We observe light emission in DC forward bias when the voltage applied is above the flat- band condition. Alternatively, we can bias the junction 100 mV below the flat-band condition, so that no current flows until a 1 or 3 GHz SAW drives a current and light emission, by pumping electrons over the hill in the intrinsic region. We have characterised this SAW-driven electroluminescence in the regime where less than one electron is transported per cycle on average. Time-resolved electroluminescence has been used to extract the electron recombination time and to quantify the contributions from electromagnetic crosstalk and the SAW. In a device without significant crosstalk, the degree of second-order coherence, g2(0), was measured using a Hanbury Brown and Twiss interferometer, and it shows the signature of antibunching.