Microwave-Assisted Cross-Polarization of Nuclear Spin Ensembles from Optically Pumped Nitrogen-Vacancy Centers in Diamond.

Autor: Shagieva F; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Zaiser S; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Neumann P; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Dasari DBR; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Stöhr R; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Denisenko A; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Reuter R; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Meriles CA; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany., Wrachtrup J; Institute for Quantum Science and Technology (IQST) , University of Stuttgart , Third Institute of Physics, Stuttgart 70569 , Germany.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2018 Jun 13; Vol. 18 (6), pp. 3731-3737. Date of Electronic Publication: 2018 May 04.
DOI: 10.1021/acs.nanolett.8b00925
Abstrakt: The ability to optically initialize the electronic spin of the nitrogen-vacancy (NV) center in diamond has long been considered a valuable resource to enhance the polarization of neighboring nuclei, but efficient polarization transfer to spin species outside the diamond crystal has proven challenging. Here we demonstrate variable-magnetic-field, microwave-enabled cross-polarization from the NV electronic spin to protons in a model viscous fluid in contact with the diamond surface. Further, slight changes in the cross-relaxation rate as a function of the wait time between successive repetitions of the transfer protocol suggest slower molecular dynamics near the diamond surface compared to that in bulk. This observation is consistent with present models of the microscopic structure of a fluid and can be exploited to estimate the diffusion coefficient near a solid-liquid interface, of importance in colloid science.
Databáze: MEDLINE
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