Journal
PHYSICAL REVIEW B
Volume 88, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.035302
Keywords
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Funding
- EU Seventh Framework Programme [237252]
- Deutsche Forschungsgemeinschaft
- Agence Nationale pour la Recherche
- Region Ile-de-France
- RFBR [13-02-00888-a]
- ESPCI
- Institut Universitaire de France
- Office of Naval Research (ONR) through the Naval Research Laboratory's Basic Research Program
- Alexander-von-Humboldt Foundation (Bonn, Germany)
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The spin dynamics in chemically synthesized CdSe/CdS core/shell nanocrystals (NCs) are studied by polarization- and time-resolved photoluminescence (PL) techniques in high magnetic fields and at low temperatures. Analysis of the recombination dynamics shows that the emission of thin-shell NCs is contributed by neutral excitons, while for thick-shell NCs it is dominated by charged excitons (trions). The sign of the PL polarization unambiguously demonstrates that these trions are negatively charged. A theoretical model of the PL polarization in an ensemble of randomly oriented NCs describes well magnetic field and time dependences of the PL polarization degree and allows us to determine the hole g factor in CdSe/CdS NCs, (gh) = -0.54. From direct measurements of the spin relaxation rate dependences on magnetic field and temperature, we identify the mechanism of the negative trion spin relaxation as two-phonon-assisted Raman scattering between the hole spin sublevels mixed by the applied magnetic field.
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