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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Eliseeva N. S., Krasnov P. O., Tomilin F. N., Fedorov A. S., Tolstaya A. V.
Заглавие : Possibility of a 2D SiC monolayer formation on Mg(0001) and MgO(111) substrates
Место публикации : Russ. J. Phys. Chem. A: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 87, Is. 8. - P.1332-1335. - ISSN 0036-0244, DOI 10.1134/S0036024413080141
Примечания : Cited References: 25
Предметные рубрики: AB-INITIO
THIN-FILMS
NANOTUBES
ENERGY
Ключевые слова (''Своб.индексиров.''): silicon carbide monolayer--density functional theory
Аннотация: The geometrical characteristics of a 2D SiC monolayer on Mg(0001) and MgO(111) plates regarded as potential materials for growing two-dimensional silicon carbide were studied. The most favorable positions of the atoms of 2D SiC on the substrates were determined. In the 2D SiC/Mg(0001) system, unlike in 2D SiC/MgO(111), the deviation of the carbon atom from the silicon carbide monolayer was insignificant (0.08 ). Consequently, magnesium can be used as a substrate for growing two-dimensional silicon carbide. The use of MgO(111) is not recommended because of a significant distortion of the 2D SiC surface.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Кузубов, Александр Александрович, Елисеева, Наталья Сергеевна, Краснов, Павел Олегович, Томилин, Феликс Николаевич, Федоров, Александр Семенович, Толстая А. В.
Заглавие : Возможность образования монослоя 2D SIC на подложках Mg(0001) и MgO(111)
Место публикации : Журн. физ. химии. - 2013. - Т. 87, № 8. - С. 1336-1340. - DOI 10.7868/S0044453713080189
Аннотация: Исследованы геометрические особенности монослоя 2D SiC на пластинках Mg(0001) и MgO(111), рассматриваемых в качестве потенциальных материалов для выращивания двумерного карбида кремния. Определены наиболее выгодные положения атомов 2D SiC на подложках. Показано, что величина выхода атома углерода из плоскости монослоя карбида кремния незначительна в системе 2D SiC/Mg(0001) в отличие от 2D SiC/MgO(111) и составляет 0.08 A. Следовательно, существует возможность использования магния в качестве подложки для выращивания двумерного карбида кремния. Использовать MgO(111) нецелесообразно из-за сильного искажения поверхности 2D SiC.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Popov Z. I., Fedorov D. A., Eliseeva N. S., Serjantova M. V., Kuzubov A. A.
Заглавие : DFT investigation of the influence of ordered vacancies on elastic and magnetic properties of graphene and graphene-like SiC and BN structures
Место публикации : Phys. Status Solidi B. - 2012. - Vol. 249, Is. 12. - P.2549-2552. - ISSN 0370-1972, DOI 10.1002/pssb.201200105
Примечания : Cited References: 32. - The work was supported by The Ministry of education and science of Russia, project 14.B37.21.0163. The authors express their gratitude to the Joint Supercomputer Center, Russian Academy of Sciences, Moscow and the supercomputer center of the Moscow State University (SKIF-MGU) for the possibility of using their computer clusters to perform all calculations.
Предметные рубрики: WALLED CARBON NANOTUBES
INITIO MOLECULAR-DYNAMICS
AB-INITIO
DEFECTS
STATE
MONOLAYER
POINTS
Ключевые слова (''Своб.индексиров.''): boron nitride--carbon silicide--elastic properties--graphene--magnetic properties--vacancies
Аннотация: Influence of ordered monovacancies on elastic properties of graphene is theoretically investigated by density functional theory (DFT) calculations. Inverse linear dependence of the graphene Young's modulus on the concentration of vacancies has been revealed and migration rate of the vacancies has been calculated as a function of applied strain. It is shown that the migration rate can be controlled by applying various strains or temperatures. The influence of ordered monovacancies on magnetic properties of graphene as well as graphene-like hexagonal carbon silicide (2D-SiC) and the boron nitride (h-BN) structures is investigated. It is established that the presence of vacancies in all systems yields the appearance of local magnetic moment. However, in 2D-SiC structure the magnetic moment occurs only in the case of a Si vacancy. Influence of the distance between vacancies on the ferromagnetic or anti-ferromagnetic ordering for all structures is established. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Eliseeva N. S., Krasnov P. O., Tomilin F. N., Fedorov A. S., Tolstaya A. V.
Заглавие : Calculating the energy of vacancies and adatoms in a hexagonal SiC monolayer
Место публикации : Russ. J. Phys. Chem. A: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 86, Is. 7. - P.1091-1095. - ISSN 0036-0244, DOI 10.1134/S0036024412070138
Примечания : Cited References: 21
Предметные рубрики: INITIO MOLECULAR-DYNAMICS
ELECTRONIC-PROPERTIES
ABSORPTION-SPECTRA
Ключевые слова (''Своб.индексиров.''): silicon carbide--defects--adatoms--density functional method
Аннотация: It is noted that the development of semiconductor SiC-electronics is prevented by a low quality of grown silicon carbide single crystals. It is found that structural defects of a substrate penetrating into an epitaxial layer upon subsequent homoepitaxial growth can considerably degrade a device's characteristics. We investigate the effect of the deformation of a hexagonal SiC monolayer on vacancy stability and material properties, and study the processes of silicon and carbon adatom migration over a surface of SiC.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Zyryanov V. Ya., Konkolovich A. V., Misckevich A. A., Krakhalev M. N., Maschke U.
Заглавие : Investigation of transmittance and small-angle light scattering by monolayer of liquid crystal droplets with modified boundary conditions
Коллективы : International Topical Meeting: Optics of Liquid Crystals (14th; Sept 25 - Oct 1, 2011; Yerevan, Armenia)
Место публикации : Mol. Cryst. Liquid Cryst. - 2012. - Vol. 561, Is. 1. - P.194-202. - ISSN 1542-1406, DOI 10.1080/15421406.2012.687237
Примечания : Cited References: 24
Предметные рубрики: NEMATIC DROPLETS
ANOMALOUS DIFFRACTION
APPROXIMATION
FILM
Ключевые слова (''Своб.индексиров.''): light modulation--light scattering--polymer dispersed liquid crystal--optical transmittance
Аннотация: A numerical method for modelling transmittance and angular distribution of light scattered by a Polymer Dispersed Liquid Crystal (PDLC) film, containing droplets with inhomogeneous boundary conditions, is proposed. It is based on the anomalous diffraction approximation and an interference approximation. The internal structures of nematic LC droplets are calculated on the basis of the free energy minimization problem solution using the relaxation method. The results for a monolayer of spherical LC droplets with modified boundary conditions caused by the local increase of the concentration of surface-active ions at the polymer-LC interface are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuklin A. V., Kuzubov A. A., Eliseeva N. S., Tomilin F. N., Fedorov A. S., Krasnov P. O.
Заглавие : Theoretical investigation of the structure and properties of the VN(111) monolayer on the MgO(111) surface
Коллективы : Russian Foundation for Basic Research [12-02-31417mol_a_2012]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 2. - P.229-234. - ISSN 1063-7834, DOI 10.1134/S1063783414020164. - ISSN 1090-6460
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research (project no. 12-02-31417mol_a_2012).
Предметные рубрики: NANOCRYSTALLINE VANADIUM NITRIDE
INITIO MOLECULAR-DYNAMICS
1ST-PRINCIPLES
COATINGS
Аннотация: The VN(111) monolayer on the MgO(111) surface has been simulated and optimized in terms of the density functional theory (DFT) calculations. The most favorable arrangement of vanadium nitride on the surface of the magnesium oxide plate has been found. The band structure and densities of states for the VN(111) monolayer have been calculated. It has been concluded based on the densities of states for the VN monolayer on the MgO surface that this structure exhibits properties of a diluted magnetic semiconductor.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ohtomo M., Yamauchi Y., Kuzubov A. A., Eliseeva N. S., Avramov P. V., Entani S., Matsumoto Y., Naramoto H., Sakai S.
Заглавие : Contact-induced spin polarization of monolayer hexagonal boron nitride on Ni(111)
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2014. - Vol. 104, Is. 5. - Ст.51604. - ISSN 0003-6951, DOI 10.1063/1.4863324. - ISSN 1077-3118
Примечания : Cited References: 20. - This study was supported by the Grant-in-Aid for Scientific Research (Grant Nos. 23860067 and 24760033) from the Japan Society for the Promotion of Science.
Предметные рубрики: METASTABLE DEEXCITATION SPECTROSCOPY
METAL-SURFACES
FILMS
TRANSITION
Аннотация: Hexagonal boron nitride (h-BN) is a promising barrier material for graphene spintronics. In this Letter, spin-polarized metastable de-excitation spectroscopy (SPMDS) is employed to study the spin-dependent electronic structure of monolayer h-BN/Ni(111). The extreme surface sensitivity of SPMDS enables us to elucidate a partial filling of the in-gap states of h-BN without any superposition of Ni 3d signals. The in-gap states are shown to have a considerable spin polarization parallel to the majority spin of Ni. The positive spin polarization is attributed to the pi-d hybridization and the effective spin transfer to the nitrogen atoms at the h-BN/Ni(111) interface. (C) 2014 AIP Publishing LLC.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kagan M. Y., Mitskan V. A., Korovushkin M. M.
Заглавие : Kohn-Luttinger superconductivity in monolayer and bilayer semimetals with the Dirac spectrum
Коллективы : RAS Division of Physical Sciences [II.3.1], Russian Foundation for BasicResearch [14-02-00058, 14-02-31237], Russian Federation [MK-526.2013.2], "Dynasty" foundation
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 119, Is. 6. - P.1140-1149. - ISSN 1063, DOI 10.1134/S1063776114120048. - ISSN 10906509(eISSN)
Примечания : Cited References:70. - This work was performed under the Program of the RAS Division ofPhysical Sciences (project no. II.3.1) and was supported financially bythe Russian Foundation for Basic Research (project nos. 14-02-00058 and14-02-31237) and by the President of the Russian Federation (grant no.MK-526.2013.2). One of the authors (M.M.K.) thanks the "Dynasty"foundation for financial support.
Предметные рубрики: FERMI-SURFACE
REPULSIVE INTERACTIONS
DOPED GRAPHENE
HUBBARD-MODEL
Аннотация: The effect of Coulomb interaction in an ensemble of Dirac fermions on the formation of superconducting pairing in monolayer and bilayer doped graphene is studied using the Kohn-Luttinger mechanism disregarding the Van der Waals potential of the substrate and impurities. The electronic structure of graphene is described using the Shubin-Vonsovsky model taking into account the intratomic, interatomic, and interlayer (in the case of bilayer graphene) Coulomb interactions between electrons. The Cooper instability is determined by solving the Bethe-Saltpeter integral equation. The renormalized scattering amplitude is obtained with allowance for the Kohn-Luttinger polarization contributions up to the second order of perturbation theory in the Coulomb interaction. It plays the role of effective interaction in the Bethe-Salpeter integral equation. It is shown that the allowance for the Kohn-Luttinger renormalizations as well as intersite Coulomb interaction noticeably affects the competition between the superconducting phases with the f-wave and d + id-wave symmetries of the order parameter. It is demonstrated that the superconducting transition temperature for an idealized graphene bilayer with significant interlayer Coulomb interaction between electrons is noticeably higher than in the monolayer case.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kagan M. Y., Mitskan V. A., Korovushkin M. M.
Заглавие : Anomalous superconductivity and superfluidity in repulsive fermion systems
Место публикации : Phys. Usp.: Turpion, 2015. - Vol. 58, Is. 8. - P.733-761. - ISSN 10637869 (ISSN), DOI 10.3367/UFNe.0185.201508a.0785
Примечания : Cited References: 369. - We are grateful to M A Baranov, A V Chubukov, D V Efremov, M V Feigel'man, V V Kabanov, K I Kugel', M S Marienko, N M Plakida, N V Prokorev, A Ya Tzalenchuk, and V V Val'kov for the fruitful discussions and constant attention to our work. The work was supported by the Russian Foundation for Basic Research (project nos. 14-02-00058 and 14-02-31237). M Yu K thanks the Program of Basic Research of the National Research University Higher School of Economics for support. The work of MM K was supported by grant of the President of the Russian Federation (SP-1361.2015.1) and the Dinasty Foundation
Предметные рубрики: HEXAGONAL BORON-NITRIDE
SCANNING-TUNNELING-MICROSCOPY
2-DIMENSIONAL HUBBARD-MODEL
HIGH-TC SUPERCONDUCTIVITY
ELECTRON-ENERGY SPECTRUM
P-WAVE SUPERCONDUCTIVITY
DOUBLE-LAYER GRAPHENE
2D KONDO-LATTICE
GROUND-STATE
TRANSITION-TEMPERATURE
Ключевые слова (''Своб.индексиров.''): anomalous superconductivity--kohn-luttinger mechanism--superfluidity--repulsive fermi gas--hubbard and t-jmodel--shubin vonsovsky model--graphene monolayer--graphene bilayer
Аннотация: We discuss the mechanisms of unconventional superconductivity and superfluidity in 3D and 2D fermionic systems with purely repulsive interaction at low densities. We construct phase diagrams of these systems and find the areas of the superconducting state in free space, as well as on the lattice in the framework of the Fermi-gas model with hard-core repulsion, the Hubbard model, the Shubin-Vonsovsky model, and the t-J model. We demonstrate that the critical superconducting temperature can be greatly increased in the spin-polarized case or in a two-band situation already at low densities. The proposed theory is based on the Kohn-Luttinger mechanism or its generalizations and explains or predicts anomalous p-, d-, and f-wave pairing in various materials, such as high-temperature superconductors, the idealized monolayer and bilayer of doped graphene, heavy-fermion systems, layered organic superconductors, superfluid 3He, spin-polarized 3He mixtures in 4He, ultracold quantum gases in magnetic traps, and optical lattices.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kagan M.Yu., Mitskan V. A., Korovushkin M. M.
Заглавие : Effect of the long-range Coulomb interaction on the phase diagram of the Kohn–Luttinger superconducting state in Idealized graphene
Место публикации : J. Low Temp. Phys.: Springer/Plenum Publishers, 2015. - Vol. - P.1-7. - ISSN 0022, DOI 10.1007/s10909-015-1427-2. - ISSN 15737357(eISSN)
Ключевые слова (''Своб.индексиров.''): unconventional superconductivity--kohn-luttinger mechanism--graphene monolayer
Аннотация: The effect of the long-range Coulomb interaction on the formation of the Kohn–Luttinger superconductivity in monolayer doped graphene is studied disregarding the Van der Waals potential of the substrate and both magnetic and non-magnetic impurities. It is shown that the allowance for the Kohn–Luttinger renormalizations up to the second order in perturbation theory in the on-site Hubbard interaction inclusively, as well as in the intersite Coulomb interaction, significantly affects the interplay between the superconducting phases with the f-wave, p+ip-wave, and d+id-wave symmetries of the order parameter. It is demonstrated that taking Coulomb repulsion of electrons located at the next-nearest neighboring atoms in such a system into account changes qualitatively the phase diagram and enhances the critical temperature of the transition to the superconducting phase.
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