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Unraveling the role of boron dimers in the electrical anisotropy and superconductivity in boron-doped diamond
Abstract
We use quantum mechanics (QM) to determine the states formed by B dopants in diamond. We find that isolated B sites prefer to form BB dimers and that the dimers pair up to form tetramers (BBCBB) that prefer to aggregate parallel to the (111) surface in the <110> direction, one double layer below the H-terminated surface double layer. These tetramers lead to metallic character (Mott metal Insulator Transition) with holes in the valence band near the point and electrons in the BBCBB tetramer promoted band along the X direction. Our experiments find very significant anisotropy in the superconductivity for boron-doped diamond thin films prepared with Microwave Plasma Assisted Chemical Vapor Deposition using deuterium-rich plasma. This leads to much higher conductivity in the X direction than the Y direction, as predicted by the QM. This phase transition to the anomalous phase is linked with the emergence of boson quantum entanglement states behaving as a bosonic insulating state. These anisotropic superconducting properties of the diamond film might enable applications such as single-photon detectors. We expect that this formation of a dirty superconductivity state is related to the BBCBB tetramers found in our QM calculations.
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Authors (11)
-
Soonho Kwon
-
Paweł P. Michałowski
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Bogdan Rutkowski
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Dongying Wang
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Xinwei Li
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Marc Bockrath
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William A. Goddard III prof
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Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
CARBON
no. 228,
ISSN: 0008-6223 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Sobaszek M., Kwon S., Klimczuk T., Michałowski P. P., Ryl J., Rutkowski B., Wang D., Li X., Bockrath M., Bogdanowicz R., Goddard III W. A.: Unraveling the role of boron dimers in the electrical anisotropy and superconductivity in boron-doped diamond// CARBON -Vol. 228, (2024), s.119337-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.carbon.2024.119337
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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