Probing the light hole / heavy hole switching with correlated magneto-optical spectroscopy and chemical analysis on a single quantum dot
| Autor: | K. Moratis, M. Den Hertog, Eric Robin, Fabrice Donatini, Edith Bellet-Amalric, J. F. Motte, Joel Cibert, David Ferrand, Pamela Rueda-Fonseca, Régis André, Yann-Michel Niquet, Alberto Artioli |
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| Přispěvatelé: | Nanophysique et Semiconducteurs (NEEL - NPSC), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanophysique et Semiconducteurs (NPSC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Nanofabrication (NEEL - Nanofab), Optique & Microscopies (NEEL - POM), Matériaux, Rayonnements, Structure (NEEL - MRS), Laboratoire d'Etude des Matériaux par Microscopie Avancée (LEMMA ), Modélisation et Exploration des Matériaux (MEM), Laboratory of Atomistic Simulation (LSIM ), Nanofab (Nanofab ), Optique et microscopies (POM), Matériaux, Rayonnements, Structure (MRS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanowire Bioengineering Cathodoluminescence 02 engineering and technology semiconductors 010402 general chemistry 01 natural sciences Molecular physics Condensed Matter::Materials Science molecular beam epitaxy General Materials Science Electrical and Electronic Engineering Spectroscopy optical spectroscopy business.industry Mechanical Engineering quantum dot cathodoluminescence General Chemistry 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 0104 chemical sciences Magnetic field Semiconductor nanowires Mechanics of Materials Quantum dot [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology Ground state business Molecular beam epitaxy |
| Zdroj: | Nanotechnology Nanotechnology, 2019, 30 (17), pp.175301. ⟨10.1088/1361-6528/aaff17⟩ Nanotechnology, Institute of Physics, 2019, 30 (17), pp.175301. ⟨10.1088/1361-6528/aaff17⟩ |
| ISSN: | 0957-4484 1361-6528 |
| Popis: | International audience; A whole series of complementary studies have been performed on the same, single nanowire containing a quantum dot: cathodoluminescence spectroscopy and imaging, micro-photoluminescence spectroscopy under magnetic field and as a function of temperature, and energy-dispersive X-ray spectrometry and imaging. The ZnTe nanowire was deposited on a Si 3 N 4 membrane with Ti/Al patterns. The complete set of data shows that the CdTe quantum dot features the heavy-hole state as a ground state, although the compressive mismatch strain promotes a light-hole ground state as soon as the aspect ratio is larger than unity (elongated dot). A numerical calculation of the whole structure shows that the transition from the heavy-hole to the light-hole configuration is pushed toward values of the aspect ratio much larger than unity by the presence of a (Zn,Mg)Te shell, and that the effect is further enhanced by a small valence band offset between the semiconductors in the dot and around it. |
| Databáze: | OpenAIRE |
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