Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking
High symmetry epitaxial quantum dots (QDs) with three or more symmetry planes provide a very promising route for the generation of entangled photons for quantum information applications. The great challenge to fabricate nanoscopic high symmetry QDs is further complicated by the lack of structural ch...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/17/10/103017 |
| _version_ | 1797751090817531904 |
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| author | K F Karlsson D Y Oberli M A Dupertuis V Troncale M Byszewski E Pelucchi A Rudra P O Holtz E Kapon |
| author_facet | K F Karlsson D Y Oberli M A Dupertuis V Troncale M Byszewski E Pelucchi A Rudra P O Holtz E Kapon |
| author_sort | K F Karlsson |
| collection | DOAJ |
| description | High symmetry epitaxial quantum dots (QDs) with three or more symmetry planes provide a very promising route for the generation of entangled photons for quantum information applications. The great challenge to fabricate nanoscopic high symmetry QDs is further complicated by the lack of structural characterization techniques able to resolve small symmetry breaking. In this work, we present an approach for identifying and analyzing the signatures of symmetry breaking in the optical spectra of QDs. Exciton complexes in InGaAs/AlGaAs QDs grown along the [111]B crystalline axis in inverted tetrahedral pyramids are studied by polarization resolved photoluminescence spectroscopy combined with lattice temperature dependence, excitation power dependence and temporal photon correlation measurements. By combining such a systematic experimental approach with a simple theoretical approach based on a point-group symmetry analysis of the polarized emission patterns of each exciton complex, we demonstrate that it is possible to achieve a strict and coherent identification of all the observable spectral patterns of numerous exciton complexes and a quantitative determination of the fine structure splittings of their quantum states. This analysis is found to be particularly powerful for selecting QDs with the highest degree of symmetry ( C _3 _v and ${D}_{3h}$ ) for potential applications of these QDs as polarization entangled photon sources. We exhibit the optical spectra when evolving towards asymmetrical QDs, and show the higher sensitivity of certain exciton complexes to symmetry breaking. |
| first_indexed | 2024-03-12T16:43:24Z |
| format | Article |
| id | doaj.art-4e52c32dea9f4bf68e3b7d769b0c13b5 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:43:24Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-4e52c32dea9f4bf68e3b7d769b0c13b52023-08-08T14:21:16ZengIOP PublishingNew Journal of Physics1367-26302015-01-01171010301710.1088/1367-2630/17/10/103017Spectral signatures of high-symmetry quantum dots and effects of symmetry breakingK F Karlsson0D Y Oberli1M A Dupertuis2V Troncale3M Byszewski4E Pelucchi5A Rudra6P O Holtz7E Kapon8Ecole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland; Linköping University, Department of Physics , Chemistry, and Biology (IFM), Semiconductor Materials, SE-58183 Linköping, SwedenEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandLinköping University, Department of Physics , Chemistry, and Biology (IFM), Semiconductor Materials, SE-58183 Linköping, SwedenEcole Polytechnique Fédérale de Lausanne (EPFL) , Laboratory of Physics of Nanostructures, CH-1015 Lausanne, SwitzerlandHigh symmetry epitaxial quantum dots (QDs) with three or more symmetry planes provide a very promising route for the generation of entangled photons for quantum information applications. The great challenge to fabricate nanoscopic high symmetry QDs is further complicated by the lack of structural characterization techniques able to resolve small symmetry breaking. In this work, we present an approach for identifying and analyzing the signatures of symmetry breaking in the optical spectra of QDs. Exciton complexes in InGaAs/AlGaAs QDs grown along the [111]B crystalline axis in inverted tetrahedral pyramids are studied by polarization resolved photoluminescence spectroscopy combined with lattice temperature dependence, excitation power dependence and temporal photon correlation measurements. By combining such a systematic experimental approach with a simple theoretical approach based on a point-group symmetry analysis of the polarized emission patterns of each exciton complex, we demonstrate that it is possible to achieve a strict and coherent identification of all the observable spectral patterns of numerous exciton complexes and a quantitative determination of the fine structure splittings of their quantum states. This analysis is found to be particularly powerful for selecting QDs with the highest degree of symmetry ( C _3 _v and ${D}_{3h}$ ) for potential applications of these QDs as polarization entangled photon sources. We exhibit the optical spectra when evolving towards asymmetrical QDs, and show the higher sensitivity of certain exciton complexes to symmetry breaking.https://doi.org/10.1088/1367-2630/17/10/103017quantum dotsymmetryexciton complexesphotoluminescencespectroscopygroup theory |
| spellingShingle | K F Karlsson D Y Oberli M A Dupertuis V Troncale M Byszewski E Pelucchi A Rudra P O Holtz E Kapon Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking New Journal of Physics quantum dot symmetry exciton complexes photoluminescence spectroscopy group theory |
| title | Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking |
| title_full | Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking |
| title_fullStr | Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking |
| title_full_unstemmed | Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking |
| title_short | Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking |
| title_sort | spectral signatures of high symmetry quantum dots and effects of symmetry breaking |
| topic | quantum dot symmetry exciton complexes photoluminescence spectroscopy group theory |
| url | https://doi.org/10.1088/1367-2630/17/10/103017 |
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