Journal ArticleDOI
Efficient carrier relaxation mechanism in ingaas/gaas self-assembled quantum dots based on the existence of continuum states
TLDR
In this article, a comparison of near-field and far-field photoluminescence excitation (PLE) spectra gives new insight into the carrier relaxation process in InGaAs/GaAs self-assembled quantum dots.Abstract:
Comparison of near-field and far-field photoluminescence excitation (PLE) spectra gives new insight into the carrier relaxation process in InGaAs/GaAs self-assembled quantum dots. The near-field PLE spectra of single quantum dots clearly show 2D-like continuum states and a number of sharp lines, between a large zero-absorption region due to the quasi-0D density of states and the 2D wetting layer absorption edge. The results reveal an efficient intradot relaxation mechanism, proceeding as follows: The carriers can relax easily within continuum states, and make transitions to the excitonic ground state by resonant emission of localized phonons.read more
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Optical emission from a charge-tunable quantum ring
R. J. Warburton,R. J. Warburton,C. Schäflein,D. Haft,F. Bickel,Axel Lorke,Khaled Karrai,Jorge M. Garcia,Winston V. Schoenfeld,Pierre Petroff +9 more
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Slow electron cooling in colloidal quantum dots.
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Room-Temperature Triggered Single Photon Emission from a III-Nitride Site-Controlled Nanowire Quantum Dot
TL;DR: T triggered single photon emission at room temperature from a site-controlled III-nitride quantum dot embedded in a nanowire is demonstrated, and a remarkable temperature insensitivity of the single photon statistics is revealed.
Journal ArticleDOI
Engineered quantum dot single-photon sources.
TL;DR: The applications of single-photon sources and their various requirements are discussed, before reviewing the progress made on a QD platform in meeting these requirements.
Journal ArticleDOI
Hidden symmetries in the energy levels of excitonic 'artificial atoms'
TL;DR: Artificial electronic structure is investigated by injecting optically a controlled number of electrons and holes into an isolated single quantum dot, which forms complexes that are artificial analogues of hydrogen, helium, lithium, beryllium, boron and carbon excitonic atoms.