Optically Detected Magnetic Resonance Study of Core-Shell and Alloy Nanocrystals of HgTe and CdS
TECHNION - ISRAEL INST OF TECH HAIFA
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The synthesis of HgTe nanocrystals NCs, coated with a CdS shell, presumably results in the formation of HgTeCdS, HgTeCdHgS core-shell structures or separated CdHgS alloys. Photoluminescence PL, continuous-wave cw and time-resolved optically detected magnetic resonance ODMR spectroscopy examined the magneto-optical properties of the dominating resonance aforementioned products. The cw ODMR measurements indicated that the NCs exhibit a band, centered at 0.39 Tesla, corresponding to an excited state electron e and hole h spin manifold, with total angular momentum FSL Fsub e12 and Fsub h32, respectively. Theoretical simulation of the ODMR hand revealed an anisotropy of the g-factor, indicating the existence of trapped carriers at a mixed Cd-Hg tetrahedral site, confirming the formation of an alloy component. The time-resolved ODMR measurements reveal a characteristic radiative decay time and spin-lattice relaxation time of these trapped carriers of hundreds of microseconds.
- Properties of Metals and Alloys
- Electricity and Magnetism