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http://elar.urfu.ru/handle/10995/102957
Название: | Electronic correlations at paramagnetic (001) and (110) NiO surfaces: Charge-transfer and Mott-Hubbard-type gaps at the surface and subsurface of (110) NiO |
Авторы: | Leonov, I. Biermann, S. |
Дата публикации: | 2021 |
Издатель: | American Physical Society |
Библиографическое описание: | Leonov I. Electronic correlations at paramagnetic (001) and (110) NiO surfaces: Charge-transfer and Mott-Hubbard-type gaps at the surface and subsurface of (110) NiO / I. Leonov, S. Biermann. — DOI 10.1103/PhysRevB.103.165108 // Physical Review B. — 2021. — Vol. 103. — Iss. 16. — 165108. |
Аннотация: | We explore the interplay of electron-electron correlations and surface effects in the prototypical correlated insulating material, NiO. In particular, we compute the electronic structure, magnetic properties, and surface energies of the (001) and (110) surfaces of paramagnetic NiO using a fully charge self-consistent DFT+ dynamical mean-field theory method. Our results reveal a complex interplay between electronic correlations and surface effects in NiO, with the electronic structure of the (001) and (110) NiO surfaces being significantly different from that in bulk NiO. We obtain a sizable reduction of the band gap at the surface of NiO, which is most significant for the (110) NiO surface. This suggests a higher catalytic activity of the (110) NiO surface than that of the (001) NiO one. Our results reveal a charge-transfer character of the (001) and (110) surfaces of NiO. Most notably, for the (110) NiO surface we observe a remarkable electronic state characterized by an alternating charge-transfer and Mott-Hubbard character of the band gap in the surface and subsurface NiO layers, respectively. This novel form of electronic order stabilized by strong correlations is not driven by lattice reconstructions but of purely electronic origin. We notice the importance of orbital differentiation of the Ni eg states to characterize the Mott-Hubbard insulating state of the (001) and (110) NiO surfaces. The unoccupied Ni eg surface states are seen to split from the lower edge of the conduction band to form strongly localized states in the fundamental gap of bulk NiO. Our results for the surface energies of the (001) and (110) NiO surfaces show that the (001) facet of NiO has significantly lower energy. This implies that the relative stability of different surfaces, at least from a purely energetic point of view, does not depend on the presence or absence of magnetic order in NiO. © 2021 authors. |
Ключевые слова: | CATALYST ACTIVITY CHARGE TRANSFER ELECTRON CORRELATIONS ELECTRONIC STRUCTURE ENERGY GAP INTERFACIAL ENERGY MEAN FIELD THEORY NICKEL PARAMAGNETISM DYNAMICAL MEAN-FIELD THEORY ELECTRON-ELECTRON CORRELATION ELECTRONIC CORRELATION ELECTRONIC ORDERING ELECTRONIC ORIGIN MOTT-HUBBARD CHARACTER RELATIVE STABILITIES STRONG CORRELATION NICKEL OXIDE |
URI: | http://elar.urfu.ru/handle/10995/102957 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор РИНЦ: | 46039355 |
Идентификатор SCOPUS: | 85104407188 |
Идентификатор WOS: | 000647126400001 |
Идентификатор PURE: | 21870133 4ffa06e3-bc11-4a45-82ea-4542f0d124e2 |
ISSN: | 24699950 |
DOI: | 10.1103/PhysRevB.103.165108 |
Сведения о поддержке: | We thank S. Backes, S. Panda, D. D. Sarma, and I. A. Abrikosov for valuable discussions. The calculations and theoretical analysis of the electronic properties of (001) and (110) NiO were supported by the state assignment of Minobrnauki of Russia (theme “Electron” No. AAAA-A18-118020190098-5). The calculations of magnetic properties of (001) and (110) NiO were supported by Russian Science Foundation (Project No. 19-72-30043). S.B. acknowledges support from the European Research Council under Grant Agreement No. 617196, Project CORRELMAT, and from IDRIS/GENCI Orsay under Project No. t2021091393. |
Карточка проекта РНФ: | 19-72-30043 |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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2-s2.0-85104407188.pdf | 1,24 MB | Adobe PDF | Просмотреть/Открыть |
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