Персона: Гришаков, Константин Сергеевич
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Институт нанотехнологий в электронике, спинтронике и фотонике
Институт ИНТЭЛ занимается научной деятельностью и подготовкой специалистов в области исследования физических принципов, проектирования и разработки технологий создания компонентной базы электроники гражданского и специального назначения, а также построения современных приборов на её основе.
Наша основная цель – это создание и развитие научно-образовательного центра мирового уровня в области наноструктурных материалов и устройств электроники, спинтроники, фотоники, а также создание эффективной инновационной среды в области СВЧ-электронной и радиационно-стойкой компонентной базы, источников ТГц излучения, ионно-кластерных технологий материалов.
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Константин Сергеевич
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- ПубликацияОткрытый доступСтатические и динамические характеристики резонансно-туннельных диодов в когерентной модели(МИФИ, 2017) Гришаков, К. С.; Гришаков, Константин Сергеевич; Елесин, В. Ф.
- ПубликацияТолько метаданныеNumerical Optimization of Grating Coupler Parameters for InP-based Photonic Circuits(2019) Grishakov, K. S.; Kargin, N. I.; Гришаков, Константин Сергеевич; Каргин, Николай Иванович© 2019 IEEE.We have performed 2D finite-difference time-domain (FDTD) simulations of fiber to chip coupling. The experimental semiconductor structure of the waveguide based on In-GaAsP /InGaAIAs compounds was used in the calculations. This structure is intended for use in electro-optical modulators constructed according to the Mach-Zehnder scheme. Our numerical calculations showed that a simple uniform grating couplers have extremely low coupling efficiency of about 5% for InP-based waveguides. We performed a global optimization of the grating coupler parameters such as etch depth, thickness, period, angle of the grating in relation to the waveguide, etc. We demonstrated a maximal coupling efficiency of about 60% which can be further increased by optimizing a number of other parameters.
- ПубликацияТолько метаданныеStability and energy characteristics of extended nitrogen nanotubes: Density functional theory study(2019) Grishakov, K. S.; Katin, K. P.; Gimaldinova, M. A.; Maslov, M. М.; Гришаков, Константин Сергеевич; Катин, Константин Петрович; Гимальдинова, Маргарита Александровна; Маслов, Михаил Михайлович© 2019, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.We apply the density functional theory with B3LYP exchange-correlation energy functional and the basis set 6-31G(d) to investigate structural, energetic, and electronic properties and stability of extended armchair and zigzag nitrogen nanotubes with a length of ≈ 3 nm. The capping effect, as well as the passivation of nanotubes’ ends by hydrogen atoms and hydroxyl groups on their stability, are studied. According to our calculations, pristine nitrogen nanotubes are unstable. Both capping and passivation of the nanotube ends provide thermodynamic stability only for (3, 0) and (4, 0) zigzag nitrogen nanotubes. Moreover, the calculated frequency spectra of considered systems confirm their dynamic stability. We stress the fact that some extended nitrogen nanotubes are found to be stable under ambient conditions, i. e., in the absence of external factors such as pressure, spatial confinement, etc. The calculated HOMO-LUMO gaps for these stable extended systems are of the order of 4 eV, so they can be assigned to the class of insulators. It is shown that nitrogen nanotubes are able to store a large amount of energy and can be used as a basis for new high-energy-density materials. We expect that the all-nitrogen tubes with the longer effective length of similar chiralities are also should be stable.
- ПубликацияТолько метаданныеEffect of a Nitrogen Doping and a Mechanical Stress on the Adsorption Capacity of Graphdiene(2019) Prudkovskii, V. S.; Dolinskii, I. Y.; Grishakov, K. S.; Гришаков, Константин Сергеевич© 2019, Pleiades Publishing, Ltd. Abstract: The quantum chemical simulation of adsorption of atomic hydrogen on pristine and nitrogen-doped graphdienes has been performed. The preferential sites, adsorption on which is most energetically beneficial, are indicated. The nitrogen presence is shown to substantially increase the adsorption capacity of the sheet. A capacity of the nitrogen-doped graphdiene to be reversibly stretched by 4% under action of external mechanical stress is demonstrated. A mechanical stretching is found to enable the control of the adsorption properties of pristine and also doped graphdienes.
- ПубликацияТолько метаданные“Tubular” Lanthanum Hydride: A New Class of High-Temperature Superconducting Materials(2019) Degtyarenko, N. N.; Grishakov, K. S.; Mazur, E. A.; Дегтяренко, Николай Николаевич; Гришаков, Константин Сергеевич; Мазур, Евгений Андреевич© 2019, Pleiades Publishing, Inc.Quantum calculations within density functional theory have predicted a new structure of lanthanum hydride La2H24 that is dynamically stable up to pressures about 150 GPa. It is a semimetal and has a low symmetry of crystal lattice P1 ¯. An important feature of this structure is the existence of quasimolecular hydrogen chains, which leads to the presence of phonon frequencies of about 420 meV, exceeding the maximum vibration frequency of the metallic hydrogen Fddd phase (ω ~ 360 meV). These properties make it possible to expect a high superconducting transition temperature for lanthanum hydride La2H24.
- ПубликацияОткрытый доступElectronic, phononic and superconducting properties of hydrides of yttrium and sulfur at high pressure(2019) Grishakov, K. S.; Degtyarenko, N. N.; Mazur, E. A.; Гришаков, Константин Сергеевич; Дегтяренко, Николай Николаевич; Мазур, Евгений Андреевич© Published under licence by IOP Publishing Ltd.The electronic, phononic, and superconducting properties of double hydrides YH6and H3S are analyzed and compared with that for triple hydride YS4H4 . A common physical and numerical approach was used to determine both the stability range and the critical superconducting temperature. The characteristics of the high-pressure phase of the triple hydride YS4H4 are obtained.
- ПубликацияОткрытый доступRelative stabilities of various fully functionalized graphene polymorphs under mechanical strain and electric field(2019) Prudkovskiy, V. S.; Grishakov, K. S.; Katin, K. P.; Maslov, M. M.; Гришаков, Константин Сергеевич; Катин, Константин Петрович; Маслов, Михаил Михайлович© 2018 Elsevier B.V. We present a density functional study of various polymorphs of graphene fully functionalized with hydrogen, chlorine, fluorine, and hydroxyl groups. We consider the influence of the constant electric field, sheet stretching and compression-induced ripples on relative stabilities of different polymorphs. We found that the effect of the electric field was negligible for all systems. Under mechanical distortions, chlorographene polymorphs decompose, whereas the graphanes, fluorinated and hydroxylated graphenes conserve their identities. Stretching results in moderate decreasing of the energy difference between the common chair-like polymorphs and other structures, but this is insufficient for obtaining the non-common polymorphs. Compression-induced ripples make non-common polymorphs of graphane as well as fluorinated and hydroxylated graphene as thermodynamically stable as the common ones. The ways of experimental observations of non-common polymorphs formed under compression are also discussed.
- ПубликацияТолько метаданныеElectron, Phonon, and Superconducting Properties of Yttrium and Sulfur Hydrides under High Pressures(2019) Grishakov, K. S.; Degtyarenko, N. N.; Mazur, E. A.; Гришаков, Константин Сергеевич; Дегтяренко, Николай Николаевич; Мазур, Евгений Андреевич© 2019, Pleiades Publishing, Inc. Abstract: We have analyzed the electron, phonon, and superconducting properties of binary hydrides YH 6 , H 3 S, YH 10 , UH 10 , and CaH 10 , as compared to the properties of ternary hydride YS 4 H 4 using a unified physical and computational approach to determining the stability range and the superconducting transition temperature. The normal and superconducting characteristics of ternary hydride YS 4 H 4 at high pressure are calculated. The results for ternary hydride YS 4 H 4 are compared with the properties of YH 6 , H 3 S, YH 10 , UH 10 , and CaH 10 compounds.