Acoustically driven photon antibunching in nanowires |
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Authors: | Hernández-Mínguez A Möller M Breuer S Pfüller C Somaschini C Lazić S Brandt O García-Cristóbal A de Lima M M Cantarero A Geelhaar L Riechert H Santos P V |
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Affiliation: | Paul-Drude-Institut für Festk?rperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany. alberto@pdi-berlin.de |
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Abstract: | The oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited carriers, as well as to spatially control exciton recombination in GaAs-based nanowires (NWs) on a subns time scale. The experiments are carried out in core-shell NWs transferred to a SAW delay line on a LiNbO(3) crystal. Carriers generated in the NW by a focused laser spot are acoustically transferred to a second location, leading to the remote emission of subns light pulses synchronized with the SAW phase. The dynamics of the carrier transport, investigated using spatially and time-resolved photoluminescence, is well-reproduced by computer simulations. The high-frequency contactless manipulation of carriers by SAWs opens new perspectives for applications of NWs in opto-electronic devices operating at gigahertz frequencies. The potential of this approach is demonstrated by the realization of a high-frequency source of antibunched photons based on the acoustic transport of electrons and holes in (In,Ga)As NWs. |
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