L. Turyanska1, F. Moro1, O. Makarovsky1, A. Patanè1, M. W. Fay2, and P. C. M. Christianen3 1School of Physics and Astronomy, The University of Nottingham, NG7 2RD, UK 2Nottingham Nanotechnology and Nanoscience Centre, NG7 2RD, UK 3High Field Magnet Laboratory, Radboud University, Nijmegen 6525 ED, The Netherlands The controlled incorporation of dopant impurities in a single colloidal nanocrystal (Quantum dot, QD) is a challenging field of research with potential for numerous applications in nanotechnology. Here we report the successful incorporation of Mn in colloidal PbS. Our QDs combine within one structure, paramagnetic properties of transition metals with photoluminescence emission in the near-infrared wavelength range (850-1200 nm) [1]. The electron spin resonance (EPR) studies reveal magnetic resonance transitions between states that are split by the hyperfine interaction between d-shell electrons and the nuclear spins of individual Mn2+ ions in the QDs (Fig. 1a), and long spin coherence times (~ 4 ms at 5K) and Rabi oscillations [2]. Finally, we use high magnetic fields (up to 30T) to show that Mn-impurities provide a tool for engineering the effective exciton g-factor (Fig. 1b) [3]. The observation of quantum oscillations and tuneable g-factor makes these new nanocrystals attractive candidates for spin manipulation studies and quantum information applications. Dual functionality, i.e. NIR luminescence and paramagnetism, of PbS:Mn also opens up exciting prospects for their future exploitation as imaging labels for combined fluorescence and magnetic resonance imaging. [1] L. Turyanska, et. al., Part. Part. Syst. Charact. 30 945 (2013). [2] F. Moro, et. al., accepted in Phys. Rev. B (2014). [3] L. Turyanska, et. al., Nanoscale 6 8919 (2014).

Near-infrared paramagnetic manganese-doped PbS nanocrystals

249th National Meeting (2015)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.