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http://elar.urfu.ru/handle/10995/111431
Название: | Magnetic, Charge, and Transport Properties of Graphene Nanoflakes |
Авторы: | Protsenko, V. S. Katanin, A. A. |
Дата публикации: | 2021 |
Издатель: | American Physical Society American Physical Society (APS) |
Библиографическое описание: | Protsenko V. S. Magnetic, Charge, and Transport Properties of Graphene Nanoflakes / V. S. Protsenko, A. A. Katanin // Physical Review B. — 2021. — Vol. 104. — Iss. 24. — 245139. |
Аннотация: | We investigate magnetic, charge, and transport properties of hexagonal graphene nanoflakes (GNFs) connected to two metallic leads by using the functional renormalization group method. The interplay between the on-site and long-range interactions leads to a competition of semimetal (SM), spin-density-wave (SDW), and charge-density-wave (CDW) phases. The ground-state phase diagrams are presented for the GNF systems with screened realistic long-range electron interaction [T. O. Wehling et al., Phys. Rev. Lett. 106, 236805 (2011)10.1103/PhysRevLett.106.236805], as well as uniformly screened long-range Coulomb potential ∝1/r. We demonstrate that the realistic screening of Coulomb interaction by σ bands causes moderate (strong) enhancement of critical long-range interaction strength, needed for the SDW (CDW) instability, compared to the results for the uniformly screened Coulomb potential. This enhancement gives rise to a wide region of stability of the SM phase for realistic interaction, such that freely suspended GNFs are far from both SM-SDW and SM-CDW phase-transition boundaries and correspond to the SM phase. Close relation between the linear conductance and the magnetic or charge states of the systems is discussed. A comparison of the results with those of other studies on GNF systems and infinite graphene sheets is presented. ©2021 American Physical Society. |
Ключевые слова: | CHARGE DENSITY WAVES DENSITY (OPTICAL) ELECTRIC FIELDS GRAPHENE GROUND STATE MAGNETISM PHASE DIAGRAMS SPIN DENSITY WAVES STATISTICAL MECHANICS TRANSPORT PROPERTIES ELECTRON'S INTERACTIONS FUNCTIONAL RENORMALIZATION GROUP GRAPHENE NANOFLAKE GROUND STATE PHASE DIAGRAM LONG RANGE INTERACTIONS LONGER-RANGE INTERACTION MAGNETIC CHARGES MAGNETIC TRANSPORT METALLIC LEADS RENORMALIZATION GROUP METHODS CHARGE DENSITY |
URI: | http://elar.urfu.ru/handle/10995/111431 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор РИНЦ: | 47548866 |
Идентификатор SCOPUS: | 85122019322 |
Идентификатор WOS: | 000737276900011 |
Идентификатор PURE: | 29206862 |
ISSN: | 2469-9950 |
DOI: | 10.1103/PhysRevB.104.245139 |
Сведения о поддержке: | The authors are grateful to A. Valli and M. Capone for stimulating discussions. The work was performed within the state assignment from the Ministry of Science and Higher Education of Russia (theme “Quant” AAAA-A18-118020190095-4) and partly supported by RFBR Grant No. 20-02-00252a. A.A.K. also acknowledges the financial support from the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2021-606). The calculations were performed on the Uran supercomputer at the IMM UB RAS. |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
Файлы этого ресурса:
Файл | Описание | Размер | Формат | |
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2-s2.0-85122019322.pdf | 14,57 MB | Adobe PDF | Просмотреть/Открыть |
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