Search

Your search keyword '"SORBA L."' showing total 25 results
Start Over Author "SORBA L." Publisher iop publishing
25 results on '"SORBA L."'

23. Ordered systems of site-controlled pyramidal quantum dots incorporated in photonic crystal cavities.

Author

Surrente, A., Felici, M., Gallo, P., Dwir, B., Rudra, A., Biasiol, G., Sorba, L., and Kapon, E.

Subjects
QUANTUM dots, PHOTONIC crystals, PHOTOLUMINESCENCE, EXCITED states, POLARIZATION (Nuclear physics)
Abstract

The coupling of a prescribed number of site-controlled pyramidal quantum dots (QDs) with photonic crystal (PhC) cavities was studied by polarization and power-dependent photoluminescence measurements. The energy of the cavity mode could be readily tuned, making use of the high spectral uniformity of the QDs and designing PhC cavities with different hole radii. Efficient coupling of the PhC cavity modes both to the ground state and to the excited state transitions of the QDs was observed, whereas no evidence for far off-resonant coupling was found. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

24. Controlling the diameter distribution and density of InAs nanowires grown by Au-assisted methods

Author

Fabio Beltram, Lucia Sorba, Valentina Zannier, Daniele Ercolani, U P Gomes, Gomes, UMESH PRASAD, Ercolani, Daniele, Zannier, V, Beltram, Fabio, and Sorba, L.

Subjects
Materials science, diameter distribution, business.industry, Scanning electron microscope, Annealing (metallurgy), Au film, Nanowire, InAs nanowires, Nanoparticle, Nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Colloidal nanoparticles, Colloid, Semiconductor, colloids, Materials Chemistry, Electrical and Electronic Engineering, business, Electronic properties
Abstract

III-V semiconductor nanowires have attracted intensive research interest because of their promising optical and electronic properties that can be manipulated by tailoring nanowire composition and morphology. Therefore, it is crucial to measure and control the diameter distribution of the grown nanowires. In this study, we analyze the diameter distribution of Au-catalyzed InAs nanowires. Au colloidal nanoparticles dispersed on InAs (111) B substrates and nanoparticles obtained by the thermal annealing of Au films were used as catalysts for InAs nanowire growth. The annealing time and temperature, the thickness of the Au film and the colloid sizes were systematically varied not only to understand their influence on nanowire diameter distribution, but also to find the optimal parameters for realizing samples with uniform and controlled diameter distribution. Morphological characterization was performed by scanning electron microscopy measurements and the image analysis was carried out using in-house-developed automated image analysis software to accurately determine the diameter distribution of the nanowires. A description of the image analysis software is also presented. The thermal annealing of films turned out to be the most suitable method for uniformity and density control, while the colloidal nanoparticles yielded narrow and more reproducible diameter distributions.

Published
2015
Full Text
View/download PDF

25. Electronic properties of quantum dot systems realized in semiconductor nanowires

Author

F Beltram, Igor G. Savelyev, Stefano Roddaro, Joe Salfi, Marina Blumin, Harry E. Ruda, Daniele Ercolani, Lucia Sorba, Salfi, J, Roddaro, S, Ercolani, Daniele, Sorba, L, Savelyev, I, Blumin M. a, Ruda H. E., and Beltram, Fabio

Subjects
Nanostructure, business.industry, Chemistry, Quantum wire, Nanowire, Nanotechnology, 02 engineering and technology, Electronic structure, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Characterization (materials science), Condensed Matter::Materials Science, Semiconductor, Quantum dot, 0103 physical sciences, Materials Chemistry, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, business, Spin-½
Abstract

Catalyst-assisted growth of semiconductor nanowires has opened up several new and exciting possibilities for low-dimensional semiconductor structures. The authors review progress on the realization of quantum dots in semiconductor nanowires, and their characterization by transport spectroscopy. Emphasis is placed on the wide range electronic properties exhibited due to flexibility of the growth process in terms of nanostructure composition and size. Particular attention is placed on studies of spin in few-electron quantum dots.

Published
2010
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results