Publication date: 3rd July 2020
The incorporation of diluted concentrations of magnetic impurities in bulk or epitaxially grown semiconductors has been of great interest in the past, for the regulation of magneto-optical properties. The topic received a renewed interest in recent times in colloidal nanostructures, in which a giant enhancement of carrier-to-dopant spin interactions led to new physical phenomena, like gaint magnetization and spin polarized emission. Magnetic doping was implemented extensively in colloidal quantum dots, but with alimited way in anisotropic structures. The discussed work deals with a control and characterization of spin degrees of freedom of photo-generated carriers in colloidal seeded nanorods (sNRs) upon implementation of magnetic doping. The material under consideration is CdSe/CdSe:Mn sNRs, including diluted concentration of Mn2+ ions across the rod.
The spin degrees of freedom in the mentioned materials were monitored by an optically detected magnetic resonance (ODMR) spectroscopy, providing a significant information on exact location of host carriers and dopants, as well as examine the interaction between them. The extracted physical parameters from the ODMR experiments included: g-factors and their anisotropy, spin exchange interactions, angular momentum, carrier-dopant coupling constants, radiative and spin-lattice relaxation times.
The temporaly resolved ODMR measurements deconvoluted a few recombination events: band-to-band, trap-to-band and trap-to-trap processes, where carriers' trapping occurred at the seed/rod interface. Those trapped carriers already possess unpaired spins, endowing selective magneto-optical properties along with a relatively long radiative and spin-relaxation times. The dominant interaction with the magnetic dopant takes place along the seed/rod interface, leading to further enhancement of spin helicity and moreover, bestows an order of magnitude extension of spin-lattice relaxation time in doped sNRs (0.1 msec) with respect to that of the pristine material (0.01 msec), with an extreme importance for practical applications. The mentioned spin-properties in confined systems, undoubtedly can play an important role in the development of new spin-based technologies.
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