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Wiring quantum dots - phase separation inducing new functionality

Applicant Fontcuberta i Morral Anna
Number 134506
Funding scheme Project funding
Research institution Laboratoire des matériaux semiconducteurs EPFL - STI - IMX - LMSC
Institution of higher education EPF Lausanne - EPFL
Main discipline Material Sciences
Start/End 01.08.2011 - 31.07.2015
Approved amount 258'656.00
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All Disciplines (2)

Discipline
Material Sciences
Condensed Matter Physics

Keywords (3)

nanowires; quantum dots; phase separation

Lay Summary (English)

Lead
Lay summary

Today, most modern technology relies mainly on materials with reduced dimensionalities, such as thin films (2D), nanowires (1D), and quantum dots (0D). An extreme success in synthesis, characterization, and application of the respective - but separated - material classes has been achieved within the past 30 years.

In this research proposal we merge: (a) three young and important research groups out of Switzerland, Austria and Germany, as well as (b) two of the most important nanostructures for future applications: quantum dots and nanowires, which will result into nano-materials with superior functionality. The synthesis techniques will be based on the use of phase separation as a vehicle for creating inhomogeneities within particular nanowire materials. Three promising approaches will be investigated within our research: (i) synthesis of stoichiometrically unstable compounds during growth, (ii) subse­quent ion implantation beyond solubility limits, and (iii) controlled phase conversion by dif­fusion. The resulting “wired quantum dots” will need a comprehensive structural characterization using e.g. electron microscopy, X-Ray diffraction and Raman scattering so that the optimum synthesis parameters can be identified. The main focus of this project is the investigation of the correlation between the structure and functionality of the wired quantum dots, in order to enable novel electronic and photonic devices.

A long term goal of the project includes the realization of a proto-type light emitting diode device and an electrical memory transistor with high-performance properties.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Quantum dots in the GaAs/AlGaAs core-shell nanowires: statistical occurrence as a function of the shell thickness’
Luca Francaviglia, Yannik Fontana, Sonia Conesa-Boj, Gözde Tutuncuoglu, Mihaela Tanasescu, Leo Duchene, Federico Matteini, Anna Fontcuberta i Morral (2015), Quantum dots in the GaAs/AlGaAs core-shell nanowires: statistical occurrence as a function of the shell thickness’, in Applied Physics Letters, 107, 033106.
Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires
Fontana Y, Corfdir P. et al (2014), Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires, in Physical Review B, 90, 075307.
Quantum dot opto-mechanics in a fully self-assembled nanowire
Montinaro Michele, Wust Gunter, Munsch Matthieu, Fontana Yannik, Russo-Averchi Eleonora, Fontcuberta i Morral Anna, Warburton Richard, Poggio Martino (2014), Quantum dot opto-mechanics in a fully self-assembled nanowire, in Nano Letters, 14, 4454-4460.
Three-dimensional nanoscale study of Al segregation and QD formation in GaAs/AlGaAs core-shell nanowires’
Lorenzo Mancini, Yannik Fontana, Sonia Conesa-Boj, I Vlum, F Vurpillot, Luca Francaviglia, Eleonora Russo-Averchi, Martin Heiss, Jordi Arbiol, Anna Fontcuberta i Morral, Lorenzo Rigutti (2014), Three-dimensional nanoscale study of Al segregation and QD formation in GaAs/AlGaAs core-shell nanowires’, in Applied Physics Letters, 105, 243106.
Tuning the g-factor of excitons and charged excitons confined to self-assembled (Al,Ga)As shell quantum dots’
Pierre Corfdir, Yannik Fontana, Barbara van Hattem, Eleonora Russo-AVerchi, Martin Heiss, Anna Fontcuberta i Morral, Robert T Phillips (2014), Tuning the g-factor of excitons and charged excitons confined to self-assembled (Al,Ga)As shell quantum dots’, in Applied Physics Letters, 105, 223111.
Self-assembled quantum dots in a nanowire system for quantum photonics
heiss martin, fontana yannik, fontcuberta i morral Anna (2013), Self-assembled quantum dots in a nanowire system for quantum photonics, in Nature Materials, 12, 439-444.

Collaboration

Group / person Country
Types of collaboration
Universität Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Richard Philips, Cambridge U. Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Universität Jena Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Spring Meeting of the Materials Research Society Talk given at a conference Excitonic Structure of Shell-Quantum Dots in GaAs-AlGaAs Core-Shell Nanowires 06.04.2015 San Francisco, United States of America Fontcuberta i Morral Anna; Fontana Yannik;
International Conference on Quantum Dots Talk given at a conference Self-assembled quantum dots for photonics 11.05.2014 Pisa, Italy Fontana Yannik;
Nanowires Talk given at a conference Fine structure of self-assembled quantum dots in nanowires 11.11.2013 Rehovot, Israel Fontcuberta i Morral Anna; Fontana Yannik;
7th nanowire growth workshop Poster Self assembled quantum dots in nanowires 10.06.2013 Lausanne, Switzerland Fontana Yannik; Fontcuberta i Morral Anna;
International Conference on Semiconductor Physics Talk given at a conference Nanowire and related heterostructures for quantum photonics and solar cells 29.07.2012 Zürich, Switzerland Fontcuberta i Morral Anna; Fontana Yannik;
General meeting of NCCR Talk given at a conference Self-assembled quantum dots in a nanowire system 01.02.2012 Arosa, Switzerland Fontana Yannik;


Awards

Title Year
Emy Noether Distinction of the European Physical Society 2015
Rodolphe et Rene Haeny Prize 2012

Associated projects

Number Title Start Funding scheme
144954 Cryogen-free scanning confocal microscopy for direct-correlation between structure and function. 01.05.2013 R'EQUIP
133832 Multi-chamber PECVD cluster system 01.08.2011 R'EQUIP
121758 Catalyst-free direct doping of MBE grown III-V nanowires 01.01.2009 Project funding
129775 Direct correlation between structure and optical properties of single nanowires 01.06.2010 Project funding

Abstract

Today, most modern technology relies mainly on materials with reduced dimensionalities, such as thin films (2D), nanowires (1D), and quantum dots (0D). An extreme success in synthesis, characterization, and application of the respective - but separated - material classes has been achieved within the past 30 years. In this research proposal we merge: (a) three young and important research groups out of Switzerland, Austria and Germany, as well as (b) two of the most important nanostructures for future applications: quantum dots and nanowires, which will result into nano-materials with superior functionality. The synthesis techniques will be based on the use of phase separation as a vehicle for creating inhomogeneities within particular nanowire materials. Three promising approaches will be investigated within our research: (i) synthesis of stochiometrically unstable compounds during growth, (ii) subse¬quent ion implantation beyond solubility limits, and (iii) controlled phase conversion by dif¬fusion. The resulting “wired quantum dots” will need a comprehensive structural characterization using e.g. electron microscopy, X-Ray diffraction and Raman scattering so that the optimum synthesis parameters can be identified. The main focus of this project is the investigation of the correlation between the structure and functionality of the wired quantum dots, in order to enable novel electronic and photonic devices. A long term goal of the project includes indeed the realization of a proto-type light emitting diode device or an electrical memory transistor with high-performance properties.
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