| The polarization response in InAs quantum dots: theoretical correlation between composition and electronic properties. | |
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MedLine Citation:
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PMID: 22469563 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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III-V growth and surface conditions strongly influence the physical structure and resulting optical properties of self-assembled quantum dots (QDs). Beyond the design of a desired active optical wavelength, the polarization response of QDs is of particular interest for optical communications and quantum information science. Previous theoretical studies based on a pure InAs QD model failed to reproduce experimentally observed polarization properties. In this work, multi-million atom simulations are performed in an effort to understand the correlation between chemical composition and polarization properties of QDs. A systematic analysis of QD structural parameters leads us to propose a two-layer composition model, mimicking In segregation and In-Ga intermixing effects. This model, consistent with mostly accepted compositional findings, allows us to accurately fit the experimental PL spectra. The detailed study of QD morphology parameters presented here serves as a tool for using growth dynamics to engineer the strain field inside and around the QD structures, allowing tuning of the polarization response. |
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Authors:
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Muhammad Usman; Vittorianna Tasco; Maria Teresa Todaro; Milena De Giorgi; Eoin P O'Reilly; Gerhard Klimeck; Adriana Passaseo |
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Publication Detail:
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Type: Journal Article Date: 2012-04-02 |
Journal Detail:
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Title: Nanotechnology Volume: 23 ISSN: 1361-6528 ISO Abbreviation: Nanotechnology Publication Date: 2012 Apr |
Date Detail:
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Created Date: 2012-04-03 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101241272 Medline TA: Nanotechnology Country: England |
Other Details:
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Languages: eng Pagination: 165202 Citation Subset: IM |
Affiliation:
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Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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