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    Chiral optical Tamm states: temporal coupled-mode theory / I. V. Timofeev [et al.] // Crystals. - 2017. - Vol. 7, Is. 4. - Ст. 113, DOI 10.3390/cryst7040113. - Cited References:71. - This work was financially sponsored by the Ministry of Science and Technology (MOST), Taiwan, under Grant No. 106-2923-M-009-002-MY3, the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, the Krasnoyarsk Region Science and Technology Support Fund to the research project No. 17-42-240464, the Scholarship of the President of the Russian Federation No. SP-227.2016.5 and by the Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (Project Nos. 0356-2015-0410 and 0356-2015-0411). The authors are thankful to A.F. Sadreev, E.N. Bulgakov, N.V. Rudakova, Y.-C. Hsiao and L.V. Pertseva for valuable discussions and comments. . - ISSN 2073-4352
   Перевод заглавия: Хиральные оптические Таммовские состояния: теория временной связанной моды

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
CHOLESTERIC LIQUID-CRYSTAL
SCULPTURED THIN-FILMS
PHOTONIC DEFECT
Кл.слова (ненормированные):
optical Tamm state -- cholesteric liquid crystal -- handedness-preserving mirror
Аннотация: The chiral optical Tamm state (COTS) is a special localized state at the interface of a handedness-preserving mirror and a structurally chiral medium such as a cholesteric liquid crystal or a chiral sculptured thin film. The spectral behavior of COTS, observed as reflection resonances, is described by the temporal coupled-mode theory. Mode coupling is different for two circular light polarizations because COTS has a helical structure replicating that of the cholesteric. The mode coupling for co-handed circularly polarized light exponentially attenuates with the cholesteric layer thickness since the COTS frequency falls into the stop band. Cross-handed circularly polarized light freely goes through the cholesteric layer and can excite COTS when reflected from the handedness-preserving mirror. The coupling in this case is proportional to anisotropy of the cholesteric and theoretically only anisotropy in magnetic permittivity can ultimately cancel this coupling. These two couplings being equal result in a polarization crossover (the Kopp-Genack effect) for which a linear polarization is optimal to excite COTS. The corresponding cholesteric thickness and scattering matrix for COTS are generally described by simple expressions.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Lab Nonlinear Opt & Spect, Krasnoyarsk 660041, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Natl Chiao Tung Univ, Coll Photon, Inst Imaging & Biomed Photon, Tainan 71150, Taiwan.

Доп.точки доступа:
Timofeev, I. V.; Тимофеев, Иван Владимирович; Pankin, Pavel S.; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Lee, Wei; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Ministry of Science and Technology (MOST), Taiwan [106-2923-M-009-002-MY3]; Russian Foundation for Basic Research; Krasnoyarsk Region Science and Technology [17-42-240464]; Scholarship of the President of the Russian Federation [SP-227.2016.5]; Siberian Branch of the Russian Academy of Sciences [0356-2015-0410, 0356-2015-0411]; Government of Krasnoyarsk Territory
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    Паршин, Александр Михайлович.
    Использование теории катастроф для изучения крупномасштабных флуктуаций в нематических каплях, изготовленных в присутствии магнитного поля / А. М. Паршин, В. Я. Зырянов, А. В. Шабанов // Жидк. кристаллы и их практич. использ. - 2017. - Т. 17, Вып. 1. - С. 83-92 ; Liquid Crystals and their Application, DOI 10.18083/LCAppl.2017.1.83. - Библиогр.: 19 . - ISSN 1991-3966
   Перевод заглавия: Use of catastrophe theory to the study of large-scale fluctuations in nematic droplets prepared under magnetic field
Кл.слова (ненормированные):
капсулированный полимером жидкий кристалл -- энергия сцепления -- катастрофа сборки -- управляющие параметры -- структурный переход -- Nematic -- Polymer -- Anchoring energy -- Cups catastrophe -- Control parameters -- Structural transition
Аннотация: В рамках теории катастроф изучены крупномасштабные флуктуации в каплях нематического жидкого кристалла 5ЦБ, изготовленных по растворной технологии в присутствии магнитного поля. Из анализа потенциальных кривых установлено, что флуктуации обусловлены вариацией директора нематика между потенциальными минимумами, связанными с энергией сцепления жидкий кристалл–полимер и магнитным полем. Определена связь управляющих параметров катастрофы сборки с параметрами сцепления. Рассмотрено влияние магнитного поля на управляющие параметры, ведущее к структурному переходу в капле жидкого кристалла, который соответствует трансформации директора из биполярной структуры с расширенными полюсами в радиальную конфигурацию. На основании проведенного анализа оценены значения энергий сцепления жидкого кристалла с полимерной поверхностью.
In the framework of catastrophe theory the large-scale fluctuations in droplets of nematic 5CB prepared by solution technology under magnetic field have been studied. From the analysis of the potential curves it was found that the fluctuations caused by the variation of the nematic director between potential minima connected with the anchoring energy of a liquid crystal-polymer and magnetic field. A relation between the control parameters of cusp catastrophe with the anchoring parameters has been determined. The influence of magnetic field on the control parameters leading to a structural transition in the droplet of the liquid crystal that corresponds to the director transformation of the bipolar structure with extended pole to a radial configuration has been analyzed. On the basis of the performed analysis the values of the anchoring energies of the liquid crystal with the polymer surface were estimated.

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Держатели документа:
Институт физики им. Л. В. Киренского, ФИЦ КНЦ СО РАН, Академгородок, 50, 660036 Красноярск, Россия
Сибирский федеральный университет, пр. Свободный, 79, 660041 Красноярск, Россия

Доп.точки доступа:
Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.; Шабанов, Александр Васильевич; Shabanov, A. V.; Parshin, A. M.

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    Kolovsky, A. R.
    Treating many-body quantum systems by means of classical mechanics / A. R. Kolovsky // Springer Proceedings in Physics. - 2017. - Vol. 191. - P. 37-48, DOI 10.1007/978-3-319-47810-4_4. - Cited References: 16 . - ISSN 0930-8989
   Перевод заглавия: Анализ квантовых много-частичных задач посредством классической механики
Кл.слова (ненормированные):
Dynamical systems -- Dynamics -- Hubbard model -- Optical lattices -- Quantum optics -- Classical mechanics -- Energy spectra -- Identical particles -- Many-body quantum systems -- Paradigmatic models -- Quantum many-body systems -- Quantum physics -- Semiclassical approaches -- Quantum theory
Аннотация: Many-body physics of identical particles is commonly believed to be a sovereign territory of Quantum Mechanics. The aim of this contribution is to show that it is actually not the case and one gets useful insights into a quantum many-body system by using the theory of classical dynamical systems. In the contribution we focus on one paradigmatic model of many-body quantum physics - the Bose– Hubbard model which, in particular, describes interacting ultracold Bose atoms in an optical lattice. We show how one can find/deduce the energy spectrum of the Bose–Hubbard model by using a kind of the semiclassical approach. © Springer International Publishing AG 2017.

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Доп.точки доступа:
Коловский, Андрей Радиевич; International Conference on Nonlinear Dynamics of Electronic Systems(23 ; 2015 ; 7 - 11 Sept. ; Como, Italy)
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Nikolaev, S.
Electronic structure and Fermi surface within the cluster perturbation theory in X-operators representation : Invited / S. Nikolaev, V. I. Kuz'min, S. G. Ovchinnikov // International workshop on actual problems of condensed matter physics : Program. Book of abstracts / Fed. Res. Center KSC SB RAS, Kirensky Inst. of phys., Sib. Fed. Univ. - Krasnoyarsk, 2017. - P,. 27

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Доп.точки доступа:
Ovchinnikov, S. G. \предс. прогр. ком.\; Овчинников, Сергей Геннадьевич; Kuz'min, V. I.; Ovchinnikov, S. G.; Federal Research Center KSC SB RAS; Kirensky Institute of Physics; Siberian Federal Univercity; International Workshop on Actual Problems of Condensed Matter Physics(27 Mar. - 1 Apr. 2017 ; Krasnoyarsk / Cheremushki)
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    Temperature and Eu2+-doping induced phase selection in NaAlSiO4 polymorphs and the controlled yellow/blue emission / M. Zhao [et al.] // Chem. Mater. - 2017. - Vol. 29, Is. 15. - P. 6552-6559, DOI 10.1021/acs.chemmater.7b02548. - Cited References: 48. - The present work was supported by the National Natural Science Foundation of China (Grants 91622125 and 51572023 and 11574003), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-16-002A3). L.N. acknowledges the support from the Special and Excellent Research Fund of Anhui Normal University. . - ISSN 0897-4756
   Перевод заглавия: Фазовый переход индуцированный температурой и допированием Eu2+ в NaAlSiO4, и контролируемое излучение желтого/голубого света
Кл.слова (ненормированные):
Chemical modification -- Coordination reactions -- Europium -- Light emitting diodes -- Photoluminescence -- Functional properties -- High color rendering index -- Local coordination structures -- Near ultraviolet excitations -- Structural transformation -- Synthesis temperatures -- Temperature dependent -- White light emitting diodes -- Density functional theory
Аннотация: The union of temperature-dependent phase transition and relating structural transformation via modification of chemical compositions is of fundamental importance for the discovery of new materials or their functional properties optimization. Herein, the synthesis temperature and Eu2+-doping content induced phase selection and variations of the local structures in nepheline, low-carnegieite and high-carnegieite types of NaAlSiO4 polymorphs were studied in detail. The luminescence of Eu2+ in low-carnegieite and nepheline phases shows blue (460 nm) and yellow (540 nm) broad-band emissions, respectively, under near-ultraviolet excitation. The photoluminescence evolution can be triggered by the different synthesis temperatures in relation to the Eu2+-doping concentration, as corroborated by density functional theory calculations on the local coordination structures and corresponding mechanical stabilities in terms of the Debye temperature. The fabricated white light-emitting diode device with high color rendering index demonstrates that the multicolor phosphors from one system provides a new gateway for the photoluminescence tuning. © 2017 American Chemical Society.

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Держатели документа:
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Anhui Key Laboratory of Optoelectronic Materials Science and Technology, Department of Physics, Anhui Normal University, Wuhu, Anhui, China

Доп.точки доступа:
Zhao, M.; Xia, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ning, L.; Liu, Q.
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Martynov, S. N.
Continual approach at T=0 in the mean field theory of incommensurate magnetic states in the frustrated Heisenberg ferromagnet with an easy axis anisotropy / S. N. Martynov, V. I. Tugarinov, A. S. Martynov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 47-49, DOI 10.1016/j.jmmm.2016.12.086. - Cited References:9 . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
FERRIMAGNET
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Soliton lattice -- Continual approach
Аннотация: The algorithm of approximate solution was developed for the differential equation describing the anharmonical change of the spin orientation angle in the model of ferromagnet with the exchange competition between nearest and next nearest magnetic neighbors and the easy axis exchange anisotropy. The equation was obtained from the collinearity constraint on the discrete lattice. In the low anharmonicity approximation the equation is resulted to an autonomous form and is integrated in quadratures. The obvious dependence of the angle velocity and second derivative of angle from angle and initial condition was derived by expanding the first integral of the equation in the Taylor series in vicinity of initial condition. The ground state of the soliton solutions was calculated by a numerical minimization of the energy integral. The evaluation of the used approximation was made for a triple point of the phase diagram.

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Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Martynov, A. S.; Мартынов, Александр Сергеевич; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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Ovchinnikov, S. G.
Multiphonon contribution to the polaron formation in cuprates with strong electron correlations and strong electron-phonon interaction / S. G. Ovchinnikov, I. A. Makarov, P. A. Kozlov // Proceedings of SPIE - The International Society for Optical Engineering : SPIE, 2017. - Vol. 10105, DOI 10.1117/12.2266799. - Cited References: 17. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Кл.слова (ненормированные):
High-temperature superconductivity -- Cuprates -- Strong electronic correlations -- Cluster form of perturbation theory -- Hubbard operator -- Three-band p-d model -- Electron-phonon interaction -- Polaron -- Franck-Condon broadening
Аннотация: In this work dependences of the electron band structure and spectral function in the HTSC cuprates on magnitude of electron-phonon interaction (EPI) and temperature are investigated. We use three-band p-d model with diagonal and offdiagonal EPI with breathing and buckling phonon mode in the frameworks of polaronic version of the generalized tight binding (GTB) method. The polaronic quasiparticle excitation in the system with EPI within this approach is formed by a hybridization of the local multiphonon Franck-Condon excitations with lower and upper Hubbard bands. Increasing EPI leads to transfer of spectral weight to high-energy multiphonon excitations and broadening of the spectral function. Temperature effects are taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Increasing the temperature results in band structure reconstruction, spectral weight redistribution, broadening of the spectral function peak at the top of the valence band and the decreasing of the peak intensity. The effect of EPI with two phonon modes on the polaron spectral function is discussed. © 2017 SPIE.

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Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Kozlov, P. A.; Козлов, Пётр Александрович; Овчинников, Сергей Геннадьевич; Oxide-Based Materials and Devices(8 ; 2017 ; 29 Jan. - 1 Feb.)
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Komogortsev, S. V.
Law of approach to magnetic saturation in nanocrystalline and amorphous ferromagnets with improved transition behavior between power-law regimes / S. V. Komogortsev, R. S. Iskhakov // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 213-216, DOI 10.1016/j.jmmm.2016.12.145. - Cited References: 41. - The work has been supported by Russian Foundation for Basic Research, Grant nos. 16-03-00256, 15-08-06673 and RFBR-KRFS 15–42-04171. . - ISSN 0304-8853
Кл.слова (ненормированные):
Ferromagnetic materials -- Ferromagnetism -- Magnetic anisotropy -- Magnetism -- Magnets -- Nanocrystals -- Perturbation techniques -- Asymptotic regimes -- Law of approaches -- Nanocrystalline and amorphous -- Perturbation theory -- Power law regime -- Random magnetic anisotropies -- Transition behavior -- Transition modes -- Saturation magnetization
Аннотация: New law of the approach to magnetic saturation is proposed based on scaling in ferromagnets with random magnetic anisotropy. This law is consistent with the known laws derived within perturbation theory in extreme cases, but it describes the transition mode between the power-low asymptotic regimes better. The improved law is proper for reliable fitting the approach magnetization to saturation in nanocrystalline and amorphous ferromagnets. © 2017 Elsevier B.V.

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Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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    Nikolaev, S. V.
    Spin and charge susceptibilities of the two-orbital model within the cluster perturbation theory for Fe-based materials / S. V. Nikolaev, M. M. Korshunov // J. Supercond. Nov. Magn. - 2016. - Vol. 29, Is. 12. - P. 3093-3097, DOI 10.1007/s10948-016-3784-8. - Cited References: 40. - We acknowledge partial support by RFBR (grants 12-02-31534, 13-02-01395, and 16-02-00098), and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). . - ISSN 1557-1939
   Перевод заглавия: Спиновая и зарядовая восприимчивости соединений железа в двухзонной модели в рамках кластерной теории возмущений
Кл.слова (ненормированные):
Fe-based superconductors -- Mutiorbital models -- Cluster perturbation theory
Аннотация: Cluster perturbation theory is used to calculate band structure, spectral functions, Fermi surface, and spin and charge susceptibilities for the two-orbital model of iron pnictides with the on-site multiorbital Hubbard interactions. Susceptibilities are calculated within the approximation combining the cluster perturbation theory for the self-energy corrections and the random-phase approximation (RPA) for the vertex renormalizations. Calculations for the small values of Hubbard repulsion U ≤ 2 eV confirm that the rigid band approximation and RPA for the spin and charge susceptibilities are suitable approaches for the case of weak interactions. © 2016, Springer Science+Business Media New York.

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Держатели документа:
Kirensky Institute of Physics, Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Николаев, Сергей Викторович
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10.

Maximova, O. M.
Neural-net modeling for direct and inverse problems of shell theory / O. M. Maximova, O. A. Maximova // IOP Conf. Ser.: Mater. Sci. Eng. - 2016. - Vol. 155, Is. 1. - Ст. 012031, DOI 10.1088/1757-899X/155/1/012031. - Cited References:5
Аннотация: Effectiveness of the use of neural-net technology for the solving of shell theory problems is shown. Some results of neural-net interpolation and extrapolation for direct and inverse problems are discussed. Exact accuracy of neural-net solving opens wide latitude for shell constructions engineering design and optimization.

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Доп.точки доступа:
Maximova, O. A.; Максимова, Ольга Александровна; International Scientific and Research Conference on Topical Issues(12 ; 2016 ; Apr ; 11-15 ; Krasnoyarsk)
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