Surface spin magnetism controls the polarized exciton emission from CdSe nanoplatelets
arXiv:1909.13700 · doi:10.1038/s41565-019-0631-7
Abstract
The surface of nominally diamagnetic colloidal CdSe nanoplatelets can demonstrate paramagnetism owing to the uncompensated spins of dangling bonds (DBSs). We reveal that by optical spectroscopy in high magnetic fields up to 15 Tesla using the exciton spin as probe of the surface magnetism. The strongly nonlinear magnetic field dependence of the circular polarization of the exciton emission is determined by the DBS and exciton spin polarization as well as by the spin-dependent recombination of dark excitons. The sign of the exciton-DBS exchange interaction can be adjusted by the nanoplatelet growth conditions.
References in corpus (5)
- Direct evidence for ferromagnetic spin polarization in gold nanoparticles
- Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets
- Electron and hole g-factors and spin dynamics of negatively charged excitons in CdSe/CdS colloidal nanoplatelets with thick shells
- Exciton spin dynamics and photoluminescence polarization of CdSe/CdS dot-in-rod nanocrystals in high magnetic fields
- Single and double electron spin-flip Raman scattering in CdSe colloidal nanoplatelets
Cited by in corpus (6)
- Magneto-optics of excitons interacting with magnetic ions in CdSe/CdMnS colloidal nanoplatelets
- Excitonic Spin-Coherence Lifetimes in CdSe Nanoplatelets Increase Significantly with Core/Shell Morphology
- Optical and electronic properties of colloidal CdSe Quantum Rings
- Nature and Control of Shakeup Processes in Colloidal Nanoplatelets
- Theory of single and double electron spin-flip Raman scattering in semiconductor nanoplatelets
- Bright-Dark Exciton Interplay Evidenced by Spin Polarization in CdSe/CdMnS Nanoplatelets