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

Moro, Fabrizio; Turyanska, Lyudmila; Granwehr, Josef; Patan�, Amalia

Abstract

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.

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), Article 205428. https://doi.org/10.1103/PhysRevB.90.205428

• Journal Article Type: Article
• Acceptance Date: Feb 9, 2014
• Online Publication Date: Nov 21, 2014
• Publication Date: Nov 21, 2014
• Deposit Date: Feb 21, 2020
• Publicly Available Date: Feb 28, 2020
• 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
• DOI: https://doi.org/10.1103/PhysRevB.90.205428
• Public URL: https://nottingham-repository.worktribe.com/output/3159474
• Publisher URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.90.205428