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Identification of Si-vacancy related room-temperature qubits in 4H silicon carbide
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Hungarian Academic Science, Hungary.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
National Institute Quantum and Radiol Science and Technology, Japan.
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 16, 161114Article in journal (Refereed) Published
Abstract [en]

The identification of a microscopic configuration of point defects acting as quantum bits is a key step in the advance of quantum information processing and sensing. Among the numerous candidates, silicon-vacancy related centers in silicon carbide (SiC) have shown remarkable properties owing to their particular spin-3/2 ground and excited states. Although, these centers were observed decades ago, two competing models, the isolated negatively charged silicon vacancy and the complex of negatively charged silicon vacancy and neutral carbon vacancy [Phys. Rev. Lett. 115, 247602 (2015)], are still argued as an origin. By means of high-precision first-principles calculations and high-resolution electron spin resonance measurements, we here unambiguously identify the Si-vacancy related qubits in hexagonal SiC as isolated negatively charged silicon vacancies. Moreover, we identify the Si-vacancy qubit configurations that provide room-temperature optical readout.

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AMER PHYSICAL SOC , 2017. Vol. 96, no 16, 161114
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URN: urn:nbn:se:liu:diva-142978DOI: 10.1103/PhysRevB.96.161114ISI: 000413848300001OAI: oai:DiVA.org:liu-142978DiVA: diva2:1156554
Note

Funding Agencies|Knut & Alice Wallenberg Foundation project Strong Field Physics and New States of Matter; Ministry of Education and Science of the Russian Federation [14.Y26.31.0005]; Swedish Research Council [VR 2016-04068]; Carl-Trygger Stiftelse for Vetenskaplig Forskning [CTS 15:339]; JSPS KAKENHI [A 17H01056]; Hungarian NKFIH Grant [NVKP_16-1-2016-0152958]

Available from: 2017-11-13 Created: 2017-11-13 Last updated: 2017-12-07Bibliographically approved

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