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Accueil du site > Vie du laboratoire > Congrès / Colloques / Conférences > Optical Properties of Individual Nanowires and Quantum Dots in High Magnetic Field, Septembre 2014 > Programme du workshop > Magneto-photoluminescence on Quantum Dot Emitters in Nanowire Shells : From a Fixed to a Tridimensional Perspective

English

Magneto-photoluminescence on Quantum Dot Emitters in Nanowire Shells : From a Fixed to a Tridimensional Perspective

Y. Fontana1,P. Corfdir2,B. Van Hattem2,E. Russo-Averchi1,M. Heiss1,S. Sonderegger3,C. Magen4,J. Arbiol5,R. T. Phillips2, and A. Fontcuberta i Morral1

 

1Laboratoire des Materiaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, Switzerland.2Cavendish Laboratory, University of Cambridge, United Kingdom. 3Attolight AG, Switzerland. 4Laboratorio de Microscopias Avanzadas - Instituto de Nanocienciade Aragon and Departamento de Fisica de la Materia Condensada,Universidad de Zaragoza, Spain. 5Institució Catalana de Recerca i Estudis Avançats (ICREA)and Institut de Ciència de Materials de Barcelona,Spain.

 

Quantum dots (QDs) in nanowires (NWs) are the object of a growing interest as they can potentially make up for the main shortcoming of planar QDs : the efficient outcoupling of the emitted light to the far-field. It was shown recently that NWs with a GaAs core and an AlGaAs shell can embed in the latter very efficient single-photon sources [1]. Yet few is known about these light emitters, as only advanced imaging techniques can provide direct structural knowledge. Photoluminescence in an external magnetic field can provide interesting information, including on the morphology, despite being indirect. The gain is then that the electronic structure is unveiled as well [2]. This is particularly the case when the observation is done with several orientations of the magnetic field. In this case, a tridimensional footprint of the emitter can be measured, allowing to estimate important parameters like size, orientation and isotropy of the emitter in addition to properties intimately linked with the electronic structure like 3D-Landé coefficients.

 

[1] M. Heiss, Y. Fontana, A. Gustafsson, G. Wüst, C. Magen, D. O’Regan, J. W. Luo, B. Ketterer, S. Conesa-Boj, A. Kuhlmann, J. Houel, E. Russo-Averchi, J. R. Morrante, M. Cantoni, N. Marzari, J. Arbiol, A. Zunger, R. Warburton, and A. Fontcuberta i Morral, Nature Mater. 12, 439 (2013)

[2] Y. Fontana, P. Corfdir, B. van Hattem, E. Russo-Averchi, M. Heiss, S. Sonderegger, C. Magen, J. Arbiol, R. T. Philips and A. Fontcuberta i Morral, arXiv:1406.0163 (2014)