Objective
Superradiance (SR) refers to spontaneous quantum phase transition, in which a self-organized build up of coherent radiation within an ensemble of quasi-degenerate emitters occurs. It was first noted by Dicke back in 1954 that, with increasing their density, the collection of N radiators starts to emit much faster and stronger comparing to spontaneous emission of individuals. More precisely, when packing up N identical emitters into the space comparable with a cube of the radiation wavelength, instead of observing isotropic and exponentially decaying emission, one produces a fierce, directional radiation burst, having a lagged peak intensity scaling like N2 and N-times reduced duration with respect to the spontaneous emission. Apart from the fundamental aspect, the research for SR is motivated by the prospects in producing ultra-short, intense, coherent light pulses - in alternative to lasers. The prerequisite for creating a SR emission is a spectral uniformity of participating transitions. For that reason SR was first successfully observed in atomic and molecular ensembles. As concerns semiconductor nanostructures, nowadays widely used in optoelectronics, the evidence for SR has never been provided, as the SR effect is obscured by the spectral inhomogeneous broadening in a semiconductor matrix. The goal of this project is to achieve the first proof for SR within an ensemble of individual emitters embedded in a nanostructured semiconductor. To this aim, we will focus our efforts on donor-bound-excitons (D0X), which are excitons (Coulomb correlated electron-hole pairs) localized on donor impurities in a semiconductor, for instance Si replacing Ga atoms in a GaAs lattice. D0Xs are characterized by small, sub-meV, inhomogeneous broadening, large oscillator strength and a few hundreds ps lifetime - all acting in favor for inducing SR. Our approach will employ methods of both linear (PL, streak camera) and nonlinear (up-conversion) time-resolved optical spectroscopy.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: https://op.europa.eu/en/web/eu-vocabularies/euroscivoc.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: https://op.europa.eu/en/web/eu-vocabularies/euroscivoc.
- natural sciences physical sciences electromagnetism and electronics optoelectronics
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors optical sensors
- natural sciences physical sciences electromagnetism and electronics semiconductivity
- natural sciences physical sciences optics laser physics
- natural sciences physical sciences optics spectroscopy
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP7-PEOPLE-2010-RG
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
75794 PARIS
France
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