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Spin manipulation and spin-lattice interaction in magnetic colloidal quantum dots

Moro, Fabrizio; Patanè, Amalia


Fabrizio Moro

Amalia Patanè


We report on the spin-lattice interaction and coherent manipulation of electron spins in Mn-doped colloidal PbS quantum dots (QDs) by electron spin resonance. We show that the phase memory time,TM, is limited by Mn–Mn dipolar interactions, hyperfine interactions of the protons (1H) on the QD capping ligands with Mn ions in their proximity ([less than] 1 nm), and surface phonons originating from thermal fluctuations of the capping ligands. In the low Mn concentration limit and at low temperature, we achieve a long phase memory time constant TM∼0.9μs, thus enabling the observation of Rabi oscillations. Our findings suggest routes to the rational design of magnetic colloidal QDs with phase memory times exceeding the current limits of relevance for the implementation of QDs as qubits in quantum information processing.

Journal Article Type Article
Publication Date Nov 21, 2014
Journal Physical Review B - Condensed Matter and Materials Physics
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 90
Issue 20
Article Number 205428
APA6 Citation Moro, F., Turyanska, L., Granwehr, J., & Patanè, A. (2014). Spin manipulation and spin-lattice interaction in magnetic colloidal quantum dots. Physical review B: Condensed matter and materials physics, 90(20),
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