The polarization response in InAs quantum dots: theoretical correlation between composition and electronic properties.
Nanotechnology
; 23(16): 165202, 2012 Apr 27.
Article
em En
| MEDLINE
| ID: mdl-22469563
ABSTRACT
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Arsenicais
/
Cristalização
/
Pontos Quânticos
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Índio
/
Modelos Químicos
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Irlanda