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Theoretical model of dynamic spin polarization of nuclei coupled to paramagnetic point defects in diamond and silicon carbide
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Hungarian Academic Science, Hungary.
Hungarian Academic Science, Hungary.
University of Chicago, IL 60637 USA; IBM Corp, NY 10598 USA.
University of Chicago, IL 60637 USA; University of Calif Santa Barbara, CA 93106 USA.
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2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 11, 115206- p.Article in journal (Refereed) Published
Abstract [en]

Dynamic nuclear spin polarization (DNP) mediated by paramagnetic point defects in semiconductors is a key resource for both initializing nuclear quantum memories and producing nuclear hyperpolarization. DNP is therefore an important process in the field of quantum-information processing, sensitivity-enhanced nuclear magnetic resonance, and nuclear-spin-based spintronics. DNP based on optical pumping of point defects has been demonstrated by using the electron spin of nitrogen-vacancy (NV) center in diamond, and more recently, by using divacancy and related defect spins in hexagonal silicon carbide (SiC). Here, we describe a general model for these optical DNP processes that allows the effects of many microscopic processes to be integrated. Applying this theory, we gain a deeper insight into dynamic nuclear spin polarization and the physics of diamond and SiC defects. Our results are in good agreement with experimental observations and provide a detailed and unified understanding. In particular, our findings show that the defect electron spin coherence times and excited state lifetimes are crucial factors in the entire DNP process.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2015. Vol. 92, no 11, 115206- p.
National Category
Physical Sciences Chemical Sciences
URN: urn:nbn:se:liu:diva-121891DOI: 10.1103/PhysRevB.92.115206ISI: 000361370600003OAI: diva2:860769

Funding Agencies|Knut and Alice Wallenberg Foundation "Isotopic Control for Ultimate Materials Properties"; Swedish Research Council (VR) [621-2011-4426, 621-2011-4249]; Swedish Foundation for Strategic Research program SRL [10-0026]; Grant of Ministry of Education and Science of the Russian Federation [14.Y26.31.0005]; Tomsk State University Academic D. I. Mendeleev Fund Program []; Swedish National Infrastructure for Computing Grants [SNIC 2013/1-331]; "Lendulet program" of Hungarian Academy of Sciences

Available from: 2015-10-13 Created: 2015-10-12 Last updated: 2016-10-11
In thesis
1. Development of theoretical approaches for post-silicon information processing
Open this publication in new window or tab >>Development of theoretical approaches for post-silicon information processing
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Despite knowing the fundamental equations in most of the physics research areas, still there is an unceasing need for theoretical method development, thanks to the more and more challenging problems addressed by the research community. The investigation of post-silicon, non-classical information processing is one of the new and rapidly developing areas that requires tremendous amount of theoretical support, new understanding, and accurate theoretical predictions. My thesis focuses on theoretical method development for solid-state quantum information processing, mainly in the field of point defect quantum bits (qubits) in silicon carbide (SiC) and diamond. Due to recent experimental breakthroughs in this field, there are diverse theoretical problems, ranging from functional development for accurate first principles description of point defects, through complete theoretical characterization of qubits, to the modeling and simulation of actual quantum information protocols, that are needed to be addressed. The included articles of this thesis cover the development of (i) hybrid-DFT+Vw approach for the first principles description of mixed correlated and uncorrelated systems, (ii) zero-field-splitting tensor calculation for solid-state quantum bit characterization, (iii) a comprehensive model for dynamic nuclear spin polarization of solid-state qubits in semiconductors, and (iv) group theoretical description of qubits and novel twodimensional materials for topologically protected states.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2016. 74 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1792
National Category
Condensed Matter Physics Other Physics Topics Other Engineering and Technologies not elsewhere specified Computer Science Other Computer and Information Science
urn:nbn:se:liu:diva-131853 (URN)10.3384/diss.diva-131853 (DOI)9789176856826 (Print) (ISBN)
Public defence
2016-11-11, Plank, Fysikhuset, Campus Valla, Linköping, 10:15 (English)
Knut and Alice Wallenberg Foundation
Available from: 2016-10-11 Created: 2016-10-11 Last updated: 2016-10-21Bibliographically approved

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