Exciton Footprint of Self-assembled AlGaAs Quantum Dots in Core-Shell Nanowires

Fontana, Y. ; Corfdir, P. ; Van Hattem, B. ; Russo-Averchi, E. ; Heiss, M. ; Sonderegger, S. ; Magen, C. (Universidad de Zaragoza) ; Arbiol, J. ; Phillips, R.T.

Resumen: Quantum-dot-in-nanowire systems constitute building blocks for advanced photonics and sensing applications. The electronic symmetry of the emitters impacts their function capabilities. Here we study the fine structure of gallium-rich quantum dots nested in the shell of GaAs-Al0.51 Ga0.49 As core-shell nanowires. We used optical spectroscopy to resolve the splitting resulting from the exchange terms and extract the main parameters of the emitters. Our results indicate that the quantum dots can host neutral as well as charged excitonic complexes and that the excitons exhibit a slightly elongated footprint, with the main axis tilted with respect to the long axis of the host nanowire. GaAs-AlxGa1-xAs emitters in a nanowire are particularly promising for overcoming the limitations set by strain in other systems, with the benefit of being integrated in a versatile photonic structure.

Idioma: Inglés

DOI: 10.1103/PhysRevB.90.075307

Año: 2014

Publicado en: Physical Review B. Condensed Matter and Materials Physics 90 (2014), 075307 [9 pp]
ISSN: 1098-0121

Factor impacto JCR: 3.736 (2014)

Categ. JCR: PHYSICS, CONDENSED MATTER rank: 14 / 67 = 0.209 (2014) - Q1 - T1

Financiación: info:eu-repo/grantAgreement/EC/FP7/312483/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM 2

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)