journal article·2023-06-13

The Role of Electrolytes in the Relaxation of Near-Surface Spin Defects in Diamond

Fabian A. Freire-Moschovitis, Roberto Rizzato, Anton Pershin, Moritz R. Schepp, Robin D. Allert, Lina M. Todenhagen, Martin S. Brandt, Adam Gali, Dominik B. Bucher

ACS Nano· Volume 17· Issue 11
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Abstract

Quantum sensing with spin defects in diamond, such as the nitrogen vacancy (NV) center, enables the detection of various chemical species on the nanoscale. Molecules or ions with unpaired electronic spins are typically probed by their influence on the NV center’s spin relaxation. Whereas it is well-known that paramagnetic ions reduce the NV center’s relaxation time ( T 1 ), here we report on the opposite effect for diamagnetic ions. We demonstrate that millimolar concentrations of aqueous diamagnetic electrolyte solutions increase the T 1 time of near-surface NV center ensembles compared to pure water. To elucidate the underlying mechanism of this surprising effect, single and double quantum NV experiments are performed, which indicate a reduction of magnetic and electric noise in the presence of diamagnetic electrolytes. In combination with ab initio simulations, we propose that a change in the interfacial band bending due to the formation of an electric double layer leads to a stabilization of fluctuating charges at the interface of an oxidized diamond. This work not only helps to understand noise sources in quantum systems but could also broaden the application space of quantum sensors toward electrolyte sensing in cell biology, neuroscience, and electrochemistry.
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Research context

OpenAlex topics: Diamond and Carbon-based Materials Research · High-pressure geophysics and materials · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany

Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany

Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, P.O. Box 49, Budapest H-1525, Hungary

Technical University of Munich, Walter Schottky Institut, Am Coulombwall 4, 85748 Garching, Germany

Technical University of Munich, TUM School of Natural Sciences, Department of Physics, James-Franck-Straße 1, 85748 Garching, Germany

Department of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Hungary

Funding

Bundesministerium f?r Bildung und Forschung · HORIZON EUROPE European Innovation Council · Munich Center for Quantum Science and Technology · Deutsche Forschungsgemeinschaft · QuantERA · Bayerisches Staatsministerium f?r Wissenschaft und Kunst · Nemzeti Kutat?si Fejleszt?si ?s Innov?ci?s Hivatal

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