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Draganyuk, O. N.
Effect of substitution of Mn and Ga atoms by Fe atom in the Mn2GaC MAX phase / O. N. Draganyuk, N. G. Zamkova, V. S. Zhandun // J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст. 169860, DOI 10.1016/j.jmmm.2022.169860. - Cited References: 40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project № 20-42-240004: “The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic M n+1 AX n (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases”. The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” ( http://ckp.urcki.ru ). The ternary phase diagrams for the calculation of formation enthalpies were taken from Materials Project ( https://materialsproject.org ) and OQMD ( https://oqmd.org/ ) databases . - ISSN 0304-8853
Кл.слова (ненормированные):
MAX phases -- First-principle calculations -- Doping -- Magnetic properties -- Ferromagnetism -- Monte-Carlo simulations
Аннотация: The magnetic properties of ordered and disordered MAX-phase Mn2-xFe2xGaC and Mn2Ga1-xFexC (x = 12.5, 25, and 50 at.%) have been studied within DFT-GGA. The investigation of phase stability of M2AX phases is performed by comparing the total energy of MAX phases to that of the set of competitive phases for calculation of the phase formation enthalpy. At the small concentration of Fe atoms (x = 12.5 %) compound remains stable. We have found that introducing Fe atom at A-site leads to the forming of ferromagnetic phase with large magnetic moments on magnetic atoms and magnetization. Through detailed group-theoretical analysis we have obtained that only ferromagnetic ordering is possible when Fe atom ordering over Ga sites. The study of exchange constants shows that the out-of-plane Fe-Mn exchange gives the main contribution in appearance of ferromagnetic phase. The temperature dependences of magnetization reveal the increase of Curie temperature in Mn2GaC with Fe atom incorporated into Ga-site.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal Univercity, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Драганюк, Оксана Николаевна
}
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Effect of substitution on magnetic moments of iron and chromium atoms in MAX phases of type (Cr4 – xFex)0.5SiC: Theoretical calculation / F. N. Tomilin, A. A. Shubin, V. V. Kozak [et al.] // Phys. Met. Metallogr. - 2022. - Vol. 123, Is. 7. - P. 640-644, DOI 10.1134/S0031918X22070195. - Cited References: 25. - The study is supported by the Russian Science Foundation (project no. 21-12-00226) and by the Interagency Supercomputer Center of the Russian Academy of Sciences (MVS-100K and MVS-10P) . - ISSN 0031-918X
Кл.слова (ненормированные):
theory of density functional -- MAX phases -- substitution effect
Аннотация: MAX phases are a family of ternary layered compounds with formal stoichiometry M2AX and have a layered hexagonal structure. Calculations with the B3LYP density functional show that, by varying the ratio between the chromium and iron in the MAX phase (Cr4 – xFex)0.5SiC, it is possible to change the lattice parameters and the magnetic moment on metal atoms. In this phase, a partial substitution of one metal for the other can be considered a technique of intended variation of their magnetic properties.

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Публикация на русском языке Влияние замещения на магнитные моменты атомов железа и хрома в МАХ-фазах вида (Cr4–xFex)0.5SiC. Теоретический расчет [Текст] / Ф. Н. Томилин, А. А. Шубин, В. В. Козак [и др.] // Физ. металлов и металловед. - 2022. - Т. 123 № 7. - С. 682-686

Держатели документа:
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kyungpook National University, Gyeongbuk Province, Daegu, South Korea

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Shubin, A. A.; Kozak, V. V.; Ivanova, D. A.; Fedorova, N. A.; Ol’shevskaya, Y. S.; Kovaleva, A. V.; Avramov, P. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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    Potential energy surfaces of adsorption and migration of transition metal atoms on nanoporus materials: The case of nanoporus bigraphene and G-C3N4 / I. Melchakova, K. M. Nikolaeva, E. A. Kovaleva [et al.] // Appl. Surf. Sci. - 2021. - Vol. 540. - Ст. 148223, DOI 10.1016/j.apsusc.2020.148223. - Cited References: 39. - The authors would like to thank Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk; and Information Technology Centre, Novosibirsk State University for providing the access to their supercomputers. Publication was supported by Project FSWM-2020-0033 of Russian Ministry of Science and Education . - ISSN 0169-4332
   Перевод заглавия: Поверхностная потенциальная энергия адсорбции и миграции атомов переходных металлов на нанопористых материалах: случай нанопористого биграфена и G-C3N4
Кл.слова (ненормированные):
Bigraphene -- g-C3N4 -- Transition metal -- Adsorption -- Migration
Аннотация: First-row transition metal (TM) atoms adsorption and migration on nanoporus 2D materials like bigraphene with double vacancies and g-C3N4 as the active sites for TM nanocluster's growth was studied within the framework of density functional theory. Both thermodynamic and kinetic aspects of composite synthesis were discussed. It was found that potential barriers of adatom's migration from bigraphene's outer surface to the interlayer space through the double vacancy are rather low values. High potential barriers of TM migration along the carbon plane prevents TM clusterization due to enhanced chemical activity of double vacancies which gives a possibility to capture the surface adatoms. As was shown for the monolayer graphene, the decrease of vacancies concentration reduces the barrier of adatom migration along the surface while the second graphene sheet in bigraphene stabilizes the structure. The behavior of TM-atom regarding g-CN2 and g-CN1 nanosheets was investigated. Potential energy surfaces were obtained and discussed. The migration barriers were found surmountable that means high probability of migration of TM adatoms to global minima and formation of TM vacancies. Comparison of barriers values with Boltzmann factor demonstrated that just standalone temperature fluctuations cannot initiate structural transitions. The properties of designed structures can be of interest of catalysts and biosensors for biomedical applications.

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Держатели документа:
Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, South Korea
Siberian Federal University, 79 Svobodny Pr., Krasnoyarsk, 660041, Russian Federation
Tomsk State University, 36 Lenin Ave., Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, FRC KSC SB RAS, 50 Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Melchakova, I.; Nikolaeva, K. M.; Kovaleva, E. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Tchaikovskaya, O. N.; Avramov, P. V.; Kuzubov, A. A.
}
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    Atomic layer deposition ZnO on porous Al2O3 nanofibers film / A. S. Voronin, A. N. Masiygin, M. S. Molokeev, S. V. Khartov // J. Phys. Conf. Ser. - 2020. - Vol. 1679, Is. 2. - Ст. 022072DOI 10.1088/1742-6596/1679/2/022072. - Cited References: 10. - Studies by scanning electron microscopy and X-ray powder diffraction were performed on the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS». The transmission electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation
   Перевод заглавия: Нанесение атомного слоя ZnO на пленку из пористых нановолокон Al2O3
Кл.слова (ненормированные):
Alumina -- Aluminum oxide -- Atomic layer deposition -- Atoms -- Composite structures -- High resolution transmission electron microscopy -- II-VI semiconductors -- Nanofibers -- Oxide minerals -- Scanning electron microscopy
Аннотация: The paper presents the results of the formation and study of the morphological and structural characteristics of the mesoporous ZnO / Al2O3 nanofibers film (ZANF). The deposition of a ZnO layer on Al2O3 nanofibers film (ANF) ~ 1 µm thick was carried out by the method of atomic layer deposition. The morphology of the mesoporous composite layer ZnO / Al2O3 (ZANF) has been studied by scanning and transmission electron microscopy. It is shown that in the process of atomic layer deposition, the ZnO layer grows according to the Stranski-Krastanov mechanism. A ZnO layer less than 5 nm thick gives an island structure in which Al2O3 nanofibers are uniformly coated with ZnO particles, an increase in the ZnO layer thickness to 15 nm demonstrates a continuous coating of Al2O3 nanofibers. The system has a core-shell structure. The resulting composite structures are promising for applications in photocatalysis and gas sensing.

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Держатели документа:
Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences (KSC SB RAS), Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Reshetnev Siberian State University Science and Technology, Krasnoyarsk, 660037, Russian Federation
Kirensky Institute of Physics (FRC KSC SB RAS), Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Voronin, A. S.; Masiygin, A. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Khartov, S. V.; International Scientific Conference on Applied Physics, Information Technologies and Engineering(2nd ; 25 September - 4 October 2020 ; Krasnoyarsk, Russian Federation)
}
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    Single-Component White-Light Emission in 2D Hybrid Perovskites with Hybridized Halogen Atoms / G. Zhou [et al.] // Adv. Opt. Mater. - 2019. - Vol. 7, Is. 24. - Ст. 1901335, DOI 10.1002/adom.201901335. - Cited References: 35. - G.J.Z. and M.Z.L. contributed equally to this work. The present work was supported by the National Natural Science Foundations of China (Grant Nos. 51722202 and 51972118), the Fundamental Research Funds for the Central Universities (D2190980), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004). . - ISSN 2195-1071
   Перевод заглавия: Однокомпонентное вещество, излучающее белый свет, из ряда двумерных гибридных перовскитов с гибридизованными атомами галогенов
Кл.слова (ненормированные):
2D halide perovskites -- photoluminescence -- white-light emission
Аннотация: With single-component photoinduced white-light (WL) emission, low-dimensional hybrid halide perovskites have emerged as a new generation of luminescent materials; however, the effect of halogens on the intrinsic light emissions and the corresponding mechanisms is still unknown. Herein, the investigation of a family of two-dimensional (2D) hybrid perovskites R2PbBr4−xClx (R = BA+, PMA+, PEA+; x = 0, 1, 2, 3, 4) highlights the influence of halogens on intrinsic emission to reveal the dependence of the photoluminescence on the nature and contribution of the halogens. Ultrabroad emissions covering the entire visible‐light region are achieved in the halogen hybrid systems with the stoichiometry of R2PbBr2Cl2 (R = BA+, PMA+, PEA+), showing their potential as single‐component WL phosphors in solid‐state lighting devices. The origin of the WL emissions is the synergistic recombination emission of free excitons and self‐trapped excitons. The ratio of halogens (Br/Cl) is confirmed to be a critical factor to fine‐tune the intrinsic emission properties. This work provides a feasible strategy to achieve single‐component WL emission in 2D hybrid perovskites, and proposes a method for regulating halogen contents for optimizing luminescent properties.

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Держатели документа:
The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Sciences and Engineering University of Science and Technology Beijing, Beijing 100083, P. R. China
Laboratory of Crystal Physics Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Engineering Physics and Radioelectronics Siberian Federal University, Krasnoyarsk 660041, Russia
Department of Physics Far Eastern State Transport University, Khabarovsk 680021, Russia
State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology, Guangzhou 510641, P. R. China

Доп.точки доступа:
Zhou, Guojun; Li, Mingze; Zhao, Jing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo
}
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    Role of Halogen Atoms on High-Efficiency Mn2+ Emission in Two-Dimensional Hybrid Perovskites / G. J. Zhou [et al.] // J. Phys. Chem. Lett. - 2019. - Vol. 10, Is. 16. - P. 4706-4712, DOI 10.1021/acs.jpclett.9b01996. - Cited References: 37. - This work is supported by the National Natural Science Foundation of China (No. 51722202 and 51572023), the Natural Science Foundations of Beijing (2172036), the Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004). . - ISSN 1948-7185
   Перевод заглавия: Роль атомов галогенов в высокоэффективном излучении Mn2 + в двумерном гибридном перовските

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Atomic, Molecular & Chemical
Рубрики:
ENERGY-TRANSFER
   LIGHT-EMISSION
   DOPING MN2+
   LEAD-FREE
   NANOCRYSTALS
Аннотация: Doped halide pervoskites as highly efficient light emitters have recently fascinated the research community, while the influence of halogen atoms X (X = Cl, Br, I) on the hybrid energy levels and photoluminescence properties remains a challenge. Here, the role of X compositions in the two-dimensional hybrid perovskite BA2PbX4 (BA = C4H9NH3) on the doped Mn2+ emission is identified, wherein Mn2+ reveals a strong luminescence dependence on the nature of the halogen, and optimum Mn2+ emission with a record quantum yield of 60.1% has been achieved in BA2PbBr4. Density functional theory calculations show that BA2PbBr4 holds low Br vacancy concentration and unique coupled states of the Mn-3d level and Pb-6p level at the conduction band minimum, leading to efficient energy transfer from the host to Mn2+. Our work sheds new light on the methods to realize strong exciton–dopant exchange coupling for achieving high-efficiency dopant luminescence.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Beihang Univ, Sch Phys, Minist Educ, Key Lab Micronano Measurement Manipulat & Phys, Beijing 100191, Peoples R China.
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Zhou, Guojun; Jia, Xiaofang; Guo, Shaoqiang; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Junying; Xia, Zhiguo
}
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Arkhipkin, V. G.
One- and two-dimensional Raman-induced diffraction gratings in atomic media / V. G. Arkhipkin, S. A. Myslivets // Phys. Rev. A. - 2018. - Vol. 98, Is. 1. - Ст. 013838, DOI 10.1103/PhysRevA.98.013838. - Cited References: 37 . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
ELECTROMAGNETICALLY INDUCED TRANSPARENCY
COLD ATOMS
ABSORPTION
Аннотация: We propose and analyze an efficient scheme for the one- and two-dimensional atomic gratings based on periodic spatial modulation of the Raman gain and dispersion, which we name the Raman-induced diffraction gratings (RIDGs). There are fundamentally different from those based on electromagnetically induced transparency. As the probe field propagates along the direction normal to the standing pump wave, it can be effectively diffracted into high-order directions. The grating is a hybrid grating, i.e. it represents a mixture of amplitude and phase gratings. We identify the conditions when all high-order diffractions are amplified. In addition, we also show that diffraction of a probe field could be dynamically controlled using an additional laser field. With its help, it is possible to suppress or amplify diffraction beams. The RIDGs can be considered as all-optical multibeam splitters with amplification.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Myslivets, S. A.; Мысливец, Сергей Александрович; Архипкин, Василий Григорьевич
}
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Bychek, A. A.
NOON state of Bose atoms in the double-well potential via an excited-state quantum phase transition / A. A. Bychek, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст. 063624, DOI 10.1103/PhysRevA.97.063624. - Cited References: 60. - The authors acknowledge financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746. . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
EINSTEIN CONDENSATE
   SUPERPOSITION STATES
   NOBEL LECTURE
   ENTANGLEMENT
Аннотация: We suggest a simple scheme for creating a NOON state of repulsively interacting Bose atoms in the double-well potential. The protocol consists of two steps. First, by setting atom-atom interactions to zero, the system is driven to the upper excited state. Second, the interactions are slowly increased and, simultaneously, the interwell tunneling is decreased to zero. We analyze fidelity of the final state to the NOON state depending on the number of atoms, ramp rate, and fluctuations of the system parameters. It is shown that for a given fidelity the ramp rate scales algebraically with the number of atoms.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Бычек, Анна Андреевна; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
}
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Kolovsky, A. R.
Atomtronics: Landauer-Büttiker equation for bosonic carriers / A. R. Kolovsky, S. M. Wimberger // Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids : conference materials. - 2018

Материалы конференции,
Смотреть тезисы

Доп.точки доступа:
Wimberger, Sandro; Коловский, Андрей Радиевич; Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg(2018 ; July 29 - August 2 ; Vilnius, Lithuania); Vilnius UniversityLithuanian Physical Society
}
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10.

Kolovsky, A. R.
Wannier-Stark states and topological phase transitions in tilted two-dimensional bipartite lattices / A. R. Kolovsky // Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids : conference materials. - 2018

Материалы конференции,
Смотреть тезисы

Доп.точки доступа:
Коловский, Андрей Радиевич; Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg(2018 ; July 29 - August 2 ; Vilnius, Lithuania)Vilnius University; Lithuanian Physical Society
}
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11.

Kudashkin, K.
Spectral properties of the Bose-Hubbard model within the cluster perturbation theory in X-operators representation / K. Kudashkin, S. Nikolaev, S. Ovchinnikov // J. Supercond. Nov. Magn. - 2017. - Vol. 30, Is. 1. - P. 103-107, DOI 10.1007/s10948-016-3781-y. - Cited References:16. - This work was supported by RFBR grant 16-02-00098, Government of Krasnoyarsk Territory and RFBR according to the research projects 16-42-243048, 16-42-240511, and 16-42-240769, and the Russian President Grant NSh-7559.2016.2. . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
TRANSITION
   SUPERFLUID
   INSULATOR
   ATOMS
Кл.слова (ненормированные):
Bose-Hubbard model -- Ultracold gases -- Cluster perturbation theory -- Density of states -- Spectral properties
Аннотация: We study the two-dimensional ultracold Bose gas in optical lattice. We use cluster perturbation theory based on Hubbard X-operators to calculate the spectral function and phase diagram of Bose-Hubbard model which is minimal model to describe behavior of ultracold gases in optical lattices. We have analyzed spectral properties of spinless bosons in a square lattice taking into account the short-range correlation.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; RFBR [16-02-00098, 16-42-243048, 16-42-240511, 16-42-240769]; Government of Krasnoyarsk Territory; Russian President Grant [NSh-7559.2016.2]
}
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12.

Kolovsky, A. R.
Bogoliubov depletion of the fragmented condensate in the bosonic flux ladder / A. R. Kolovsky // Phys. Rev. A. - 2017. - Vol. 95, Is. 3. - Ст. 033622, DOI 10.1103/PhysRevA.95.033622. - Cited References: 31. - The author acknowledges discussions with A. Eckardt, the hospitality of MPIPKS in Dresden, and financial support from Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746. . - ISSN 1050-2947
Кл.слова (ненормированные):
Bosons -- Crystal lattices -- Ladders -- Optical lattices -- Bogoliubov -- Dispersion relations -- Interacting bosons -- Ultracold atoms -- Ground state
Аннотация: We theoretically analyze the ground state of weakly interacting bosons in the flux ladder - the system that has been recently realized by means of ultracold atoms in the specially designed optical lattice [M. Atala, M. Aidelsburger, M. Lohse, J. T. Barreiro, B. Paredes, and I. Bloch, Nat. Phys. 10, 588 (2014)1745-247310.1038/nphys2998]. It is argued that, for the system parameters corresponding to two degenerate minima in the Bloch dispersion relation, the ground state is a fragmented condensate. We study the Bogoliubov depletion of this condensate and discuss the role of boundary conditions. © 2017 American Physical Society.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Коловский, Андрей Радиевич
}
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13.

Kolovsky, A. R.
Microscopic models of source and sink for atomtronics / A. R. Kolovsky // Phys. Rev. A. - 2017. - Vol. 96, Is. 1. - Ст. 011601, DOI 10.1103/PhysRevA.96.011601. - Cited References:26. - The author acknowledges financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746. . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
BOSE-HUBBARD MODEL
   ANDERSON LOCALIZATION
   BLOCH OSCILLATIONS
   ATOMS
Аннотация: We analyzemicroscopic models of the particle source or sink which consist of a one- or two-site Bose-Hubbard model (the system) weakly coupled to amany-site Bose-Hubbard model (the reservoir). Assuming unequal filling factors for the system and reservoir, we numerically study equilibration dynamics and compare it with the solution of the master equation on the reduced density matrix of the system. Necessary conditions for the validity of the master equation approach are formulated.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Коловский, Андрей Радиевич; Russian Foundation; Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
}
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14.

    Structure and magnetic properties of titanium nickelide nanoparticles synthesized by pulsed laser ablation method / A. K. Drozdova [et al.] // J. Phys. Conf. Ser. - 2017. - Vol. 857, Is. 1. - Ст. 012007, DOI 10.1088/1742-6596/857/1/012007. - Cited References: 9 . - ISSN 1742-6588
   Перевод заглавия: Структура и магнитные свойства наночастиц никелида титана, синтезированных методом импульсной лазерной абляции
Кл.слова (ненормированные):
Ablation -- Coatings -- High resolution transmission electron microscopy -- Laser ablation -- Nanomagnetics -- Nanoparticles -- Synthesis (chemical) -- Titanium -- Transmission electron microscopy -- Equiatomic composition -- Magnetization values -- Ti atoms -- Titanium nickelide -- Pulsed lasers
Аннотация: We have successfully synthesized magnetic titanium nickelide nanoparticles with equiatomic composition by pulsed laser ablation method. Using transmission electron microscopy and microanalysis was revealed that particles represent the homogeneous conglomerates containing identical amount of Ni and Ti atoms. The magnetization value of nanoparticles was estimated.

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Доп.точки доступа:
Drozdova, A. K.; Cherepanov, V. N.; Svetlichny, V. A.; Kveglis, L. I.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; International Conference on Films and Coatings(13 ; 18-20 April 2017 ; St. Petersburg)
}
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15.

    Kolovsky, A. R.
    Bose-Hubbard Hamiltonian: Quantum chaos approach / A. R. Kolovsky // Int. J. Mod. Phys. B. - 2016. - Vol. 30, Is. 10. - Ст. 1630009, DOI 10.1142/S0217979216300097. - Cited References:42 . - ISSN 0217-9792. - ISSN 1793-6578
   Перевод заглавия: Гамильтониан Бозе-Хаббарда: подход с точки зрения квантового хаоса

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
Optical lattice
   Dynamics
   Atoms
   States
   Model
Кл.слова (ненормированные):
Cold atoms in optical lattices -- quantum transport -- nonlinear dynamics and chaos
Аннотация: We discuss applications of the theory of quantum chaos to one of the paradigm models of many-body quantum physics - the Bose-Hubbard (BH) model, which describes, in particular, interacting ultracold Bose atoms in an optical lattice. After preliminary, pure quantum analysis of the system we introduce the classical counterpart of the BH model and the governing semiclassical equations of motion. We analyze these equations for the problem of Bloch oscillations (BOs) of cold atoms where a number of experimental results are available. The paper is written for nonexperts and can be viewed as an introduction to the field.

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Доп.точки доступа:
Коловский, Андрей Радиевич
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16.

Kolovsky, A. R.
Mott-insulator state of cold atoms in tilted optical lattices: Doublon dynamics and multilevel Landau-Zener tunneling / A. R. Kolovsky, D. N. Maksimov // Phys. Rev. A. - 2016. - Vol. 94, Is. 4. - Ст. 043630, DOI 10.1103/PhysRevA.94.043630. - Cited References: 34 . - ISSN 1050-2947
Кл.слова (ненормированные):
Crystal lattices -- Optical materials -- Analytical expressions -- Cold atoms -- Doublons -- Dynamical response -- In-laboratory experiments -- Landau zener tunneling -- Mott insulator state -- Optical lattices
Аннотация: We discuss the dynamical response of strongly interacting Bose atoms in an adiabatically tilted optical lattice. The analysis is performed in terms of the multilevel Landau-Zener tunneling. Different regimes of tunneling are identified and analytical expressions for the doublon number, which is the quantity measured in laboratory experiments, are derived. © 2016 American Physical Society.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Коловский, Андрей Радиевич
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17.

Kolovsky, A. R.
Wave-packet dynamics of cold atoms in 2D lattices subject to synthetic magnetic and electric fields / A. Kolovsky // Modern problems of laser physics : матер. симп. - Новосибирск : ЗАО ИПП "Офсет", 2016. - P. 258

РИНЦ,
Материалы чсимпозиума,
Материалы симпозиума

Доп.точки доступа:
Коловский, Андрей Радиевич; International symposium and school for young scientist "Modern problems of laser physics"(7 ; )(2016 ; 22.08 - 28.08 ; Novosibirsk)Международный симпозиум и школа для молодых ученых "Современные проблемы лазерной физики"(7 ; )(2016 ; 22.08 - 28.08 ; Новосибирск); Институт лазерной физики Сибирского отделения РАН; Новосибирский государственный университет; Институт спектроскопии РАН; Московский государственный университет им. М.В. Ломоносова; Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений
Нет сведений об экземплярах (Источник в БД не найден)
}
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18.

Study of interaction between transition metal atoms and bigraphene monovacancy by means of quantum chemistry / A. A. Kuzubov [et al.] // Comput. Mater. Sci. - 2016. - Vol. 112, Part A. - P. 269-275, DOI 10.1016/j.commatsci.2015.11.002. - Cited References: 39. - The authors would like to thank Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; and L.V. Kirensky Institute of Physics of SB RAS, Krasnoyarsk, for providing the access to their supercomputers. This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1500.2014/K). . - ISSN 0927-0256

РУБ Materials Science, Multidisciplinary
Рубрики:
INITIO MOLECULAR-DYNAMICS
   MASSLESS DIRAC FERMIONS
   GRAPHENE
   VACANCIES
   POINTS
   GAS
Кл.слова (ненормированные):
Bigraphene -- Spintronics -- Transition metal -- Adsorption -- Migration
Аннотация: First-row transition metal atoms adsorption on bigraphene monovacancy was studied within the framework of DFT in periodic boundary conditions. Electronic and magnetic properties of composites were analyzed and their potential utilization in spintronics was discussed. Barriers of metal atoms migration from bigraphene surface to the interlayer space through the vacancy were estimated in order to consider both thermodynamic and kinetic aspects of composites experimental preparation. Formation of metal atoms inner-sorbed on bigraphene was found to demand harsh synthesis conditions; whereas outer-sorbed composites demonstrate significantly higher degree of spin polarization which makes them perspective for usage in spintronic devices. © 2015 Elsevier B.V.

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Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
L.V. Kirensky Institute of Physics, 50 Akademgorodok, Krasnoyarsk, Russian Federation
Kyungpook National University, 80 Daehakro, Bukgu, Daegu, South Korea

Доп.точки доступа:
Kuzubov, A. A.; Кузубов, Александр Александрович; Avramov, P. V.; Аврамов, Павел Вениаминович; Nikolaeva, K. M.; Mikhaleva, N. S.; Kovaleva, E. A.; Kuklin, A. V.; Куклин, Артем Валентинович; Fedorov, A. S.; Федоров, Александр Семенович
}
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19.

Kolovsky, A. R.
Quantum phase transitions in two-dimensional tilted optical lattices / A. R. Kolovsky // Phys Rev A. - 2016. - Vol. 93, Is. 3. - Ст. 033626, DOI 10.1103/PhysRevA.93.033626. - Cited References: 19. - The author acknowledges fruitful discussions with M. Fleischhauer and F. Grusdt; the hospitality of the University of Kaiserslautern, where a part of this work was conducted; and financial support from Russian Foundation for Basic Research through Project No. 15-02-00463, Wannier-Stark states and Bloch oscillations of a quantum particle in a generic two-dimensional lattice. . - ISSN 1050-2947

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
Atoms
Аннотация: We discuss the quantum phase transition between the Mott-insulator state and the density-wave state of cold Bose atoms in a two-dimensional (2D) square lattice as the lattice is adiabatically tilted along one of its primary axes. It is shown that a small misalignment of the tilt drastically changes the result of the adiabatic passage and, instead of the density-wave state, one obtains a disordered state. An intrinsic relation of the problem to Bloch oscillations of hard-core bosons in a 2D lattice is illuminated. © 2016 American Physical Society.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Коловский, Андрей Радиевич
}
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20.

Kolovsky, A. R.
Edge-induced Bloch oscillations and ordinary conductivity in the presence of a gauge field / A. R. Kolovsky // Topological effects and synthetic gauge/magnetic fields fo atoms and fotons : book of abstracts. - Zagreb, 2015. - С. 28

Материалы конференции

Доп.точки доступа:
Коловский, Андрей Радиевич; Workshop on topological effects and synthetic gauge/magnetic fields fo atoms and fotons(2015 ; 29 Sept.-1 Oct. ; Zagreb, Croatia)University of Zagreb
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