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Optical Polarization of Nuclear Spins in Silicon Carbide
University of Chicago, IL 60637 USA; IBM TJ Watson Research Centre, NY 10598 USA.
University of Chicago, IL 60637 USA; University of Calif Santa Barbara, CA 93106 USA; Hungarian Academic Science, Hungary.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Hungary.
Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Hungary; Eotvos Lorand University, Hungary.
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2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 24, 247603- p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate optically pumped dynamic nuclear polarization of Si-29 nuclear spins that are strongly coupled to paramagnetic color centers in 4H- and 6H-SiC. The 99% +/- 1% degree of polarization that we observe at room temperature corresponds to an effective nuclear temperature of 5 mu K. By combining ab initio theory with the experimental identification of the color centers optically excited states, we quantitatively model how the polarization derives from hyperfine-mediated level anticrossings. These results lay a foundation for SiC-based quantum memories, nuclear gyroscopes, and hyperpolarized probes for magnetic resonance imaging.

Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 114, no 24, 247603- p.
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-120166DOI: 10.1103/PhysRevLett.114.247603ISI: 000356407600010OAI: diva2:841482

Funding Agencies|Air Force Office of Scientific Research (AFOSR); AFOSR Multidisciplinary Research Program of the University Research Initiative; National Science Foundation; Material Research Science and Engineering Center; Knut and Alice Wallenberg Foundation "Isotopic Control for Ultimate Materials Properties"; Lendulet program of the Hungarian Academy of Sciences; National Supercomputer Center in Sweden

Available from: 2015-07-13 Created: 2015-07-13 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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