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- Title
Anisotropic Confinement, Electronic Coupling and Strain Induced Effects Detected by Valence-Band Anisotropy in Self-Assembled Quantum Dots.
- Authors
Villegas-Lelovsky, L; Teodoro, MD; Lopez-Richard, V; Calseverino, C; Malachias, A; Marega, E; Liang, BL; Mazur, Yu; Marques, GE; Trallero-Giner, C; Salamo, GJ
- Abstract
method to determine the effects of the geometry and lateral ordering on the electronic properties of an array of one-dimensional self-assembled quantum dots is discussed. A model that takes into account the valence-band anisotropic effective masses and strain effects must be used to describe the behavior of the photoluminescence emission, proposed as a clean tool for the characterization of dot anisotropy and/or inter-dot coupling. Under special growth conditions, such as substrate temperature and Arsenic background, 1D chains of InGa As quantum dots were grown by molecular beam epitaxy. Grazing-incidence X-ray diffraction measurements directly evidence the strong strain anisotropy due to the formation of quantum dot chains, probed by polarization-resolved low-temperature photoluminescence. The results are in fair good agreement with the proposed model.
- Subjects
ANISOTROPY; STRAINS &; stresses (Mechanics); CONDUCTION bands; MOLECULAR self-assembly; QUANTUM dots; ELECTRONIC structure; EFFECTIVE mass (Physics); PHOTOLUMINESCENCE; X-ray diffraction
- Publication
Nanoscale Research Letters, 2011, Vol 6, Issue 1, p1
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1007/s11671-010-9786-8