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Ultrafast Room Temperature Single-Photon Source from Nanowire-Quantum Dots

2012; American Chemical Society; Volume: 12; Issue: 6 Linguagem: Inglês

10.1021/nl300733f

1530-6992

S. Bounouar, M. Elouneg‐Jamroz, M. den Hertog, C. Morchutt, E. Bellet‐Amalric, R. André, Catherine Bougerol, Y. Genuist, J.-Ph. Poizat, S. Tatarenko, K. Kheng,

Quantum Dots Synthesis And Properties

Epitaxial semiconductor quantum dots are particularly promising as realistic single-photon sources for their compatibility with manufacturing techniques and possibility to be implemented in compact devices. Here, we demonstrate for the first time single-photon emission up to room temperature from an epitaxial quantum dot inserted in a nanowire, namely a CdSe slice in a ZnSe nanowire. The exciton and biexciton lines can still be resolved at room temperature and the biexciton turns out to be the most appropriate transition for single-photon emission due to a large nonradiative decay of the bright exciton to dark exciton states. With an intrinsically short radiative decay time (≈300 ps) this system is the fastest room temperature single-photon emitter, allowing potentially gigahertz repetition rates.