Quantum-size Dependence of Fine Structure and Spin Lifetime in Self-assembled InAlAs/AlGaAs Quantum Dots

• Published in: SILICON Vol. 10; no. 1; pp. 147 - 151
• Main Authors: Sahli, A., Melliti, A., Maaref, M. A., Lemaître, A., Testelin, C.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2018; Springer Nature B.V; Springer
• Subjects: Chemistry; Chemistry and Materials Science; Electrons; Emission; Energy; Environmental Chemistry; Excitons; Fine structure; Indium aluminum arsenides; Inorganic Chemistry; Lasers; Lifetime; Magnetic fields; Materials Science; Optical Devices; Optics; Original Paper; Photoluminescence; Photonics; Physics; Polymer Sciences; Quantum dots; Self-assembly; Semiconductors; Splitting; Symmetry; A. Nanostructures; D. Electronic structure; D. Optical properties; A. Semiconductors
• ISSN: 1876-990X; 1876-9918
• DOI: 10.1007/s12633-015-9395-3

The quantum dot size dependence of spin lifetimes and fine structure are studied by polarization-resolved photoluminescence experiments on InAlAs self-assembled quantum dots. Hanle measurements reveal that the dots dimensions influence the scaled spin lifetime (
g
x
e
T
s
) and the transverse Landé-g factor (
g
x
e
)
increases with decreasing dots dimensions. Under magnetic field applied in Faraday geometry, we study the anisotropic exchange splitting of bright exciton states as a function of energy emission (QDs size).The fine structure splitting (FSS)
ℏ
ω
exc
increases from 12 to as much as 15
μ
eV with quantum dots energy emission.