A site-controlled quantum dot system offering both high uniformity and spectral purity

Abstract

'A site-controlled quantum dot system offering both high uniformity and spectral purity', Applied Physics Letters, 94(22), pp. 223121.

Impact of nitrogen incorporation on pseudomorphic site-controlled quantum dots grown by metalorganic vapor phase epitaxy

“…Recently a simple wavelength tuning mechanism was achieved by changing the dot indium concentration. 8,9 The strain in the InGaAs layers nevertheless limited the QD emission wavelength to ϳ880 nm ͑for a nominal Indium concentration of 45%͒ and delivered poorer spectral quality in the samples with higher In content.…”

Self-Limiting Evolution of Seeded Quantum Wires and Dots on Patterned Substrates

“…Pyramidal QDs have wide-ranging properties and applications, including (i) the reproducible formation of excitonic states, which provides uniform single photon emission [11][12][13], (ii) precise coupling in quantum electrodynamic cavities [14] because of accurate site and energy control, and (iii) efficient emission of polarizationentangled photons [15] owing to the high-symmetry [111] growth orientation and the spatial uniformity provided by the patterned substrate. The dependence of the optical transition polarization on the QD shape, size, and symmetry [16] has recently been extended to an analysis that reveals the delicate interplay between the excitonic fine structure and the symmetry and composition of QDs [17].…”

Single pairs of time-bin-entangled photons

“…Second, our type of sample offers the potential of scalability. The pyramidal quantum dot used in this study is just one among tens of thousands of very similar position-controlled quantum dots on the sample, as, indeed, site-controlled pyramidal quantum dots have demonstrated to be the highest uniformity quantum-dot system to date [41,42]. Current research efforts in quantum-dot growth will result in fabrication techniques with even higher control of shape, composition, and uniformity.…”