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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

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