Resonant Excitation and Imaging of Nonequilibrium Exciton Spins in Single Core−Shell GaAs−AlGaAs Nanowires

Nonequilibrium spin distributions in single GaAs/AlGaAs core−shell nanowires are excited using resonant polarized excitation at 10 K. At all excitation energies, we observe strong photoluminescence polarization due to suppressed radiative recombination of excitons with dipoles aligned perpendicular...

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Bibliographic Details
Published in:Nano letters 2007-03, Vol.7 (3), p.588-595
Main Authors: Hoang, Thang Ba, Titova, Lyubov V, Yarrison-Rice, Jan M, Jackson, Howard E, Govorov, Alexander O, Kim, Yong, Joyce, Hannah J, Tan, H. Hoe, Jagadish, Chennupati, Smith, Leigh M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Nanoscale materials and structures: fabrication and characterization
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other topics in nanoscale materials and structures
Photoluminescence
Physics
Quantum wires
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Summary:Nonequilibrium spin distributions in single GaAs/AlGaAs core−shell nanowires are excited using resonant polarized excitation at 10 K. At all excitation energies, we observe strong photoluminescence polarization due to suppressed radiative recombination of excitons with dipoles aligned perpendicular to the nanowire. Excitation resonances are observed at 1- or 2-LO phonon energies above the exciton ground states. Using rate equation modeling, we show that, at the lowest energies, strongly nonequilibrium spin distributions are present and we estimate their spin relaxation rate.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl062383q