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1.


   
    Analyzing the symmetry of the Raman spectra of crystals according to angular dependences / E. V. Golovkina, S. N. Krylova, A. N. Vtyurin, A. S. Krylov // Bull. Russ. Acad. Sci. Phys. - 2024. - Vol. 88, Is. 5. - P. 773-778, DOI 10.1134/S1062873824706573. - Cited References: 32. - This work was supported by the Russian Foundation for Basic Research, project no. 21-52-12018. The authors are grateful to Dr. Irena Senkovska for providing our DUT-8(Ni) samples . - ISSN 1062-8738. - ISSN 1934-9432
Кл.слова (ненормированные):
angular dependences of Raman scattering -- metal–organic framework crystals
Аннотация: The authors propose a way of reconstructing the Raman tensor by studying the angular dependences of the intensities of the Raman lines of unoriented microcrystals. The technique is verified using familiar calomel Hg2Cl2 crystals. It is shown that the lines on DUT-8 (Ni) crystals indicating phases with open and closed pores have different types of symmetries. The technique can be used to reconstruct the Raman tensor for any unoriented crystalline sample.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia

Доп.точки доступа:
Golovkina, E. V.; Головкина, Елена Вячеславовна; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич
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2.


   
    Bound states in the continuum protected by reduced symmetry of three-dimensional open acoustic resonators / B. Jia, L. Huang, A. S. Pilipchuk [et al.] // Phys. Rev. Appl. - 2023. - Vol. 19, Is. 5. - Ст. 054001, DOI 10.1103/PhysRevApplied.19.054001. - Cited References: 30. - L. Huang and A.E. Miroshnichenko were supported by the Australian Research Council Discovery Project (DP200101353) and the UNSW Scientia Fellowship program. B. Jia, S. Huang, and Y. Li are supported by the National Natural Science Foundation of China (Grant No. 12074286), and Shanghai Science and Technology Committee under Grant No. 21JC1405600 . - ISSN 2331-7019
Аннотация: Bound states in the continuum (BICs) have been demonstrated as a powerful tool for trapping acoustic fields in an acoustic resonator. It has been widely recognized that symmetry-protected (SP) BICs result from symmetry incompatibility of some eigenmodes of a resonator with propagating modes of waveguides. The most typical example of SP BIC is the odd eigenmode of the resonator with the eigenfrequency embedded into the propagating band of even propagating eigenmodes of the waveguide. In this work, we consider a more sophisticated case of an acoustic cuboid resonator that is opened by the attachment of two cylindrical waveguides. We show that BICs can be sustained in an open acoustic resonator with reduced symmetry. For symmetrical positions of waveguides, the eigenmodes of the cuboid can also be classified as SP BICs and show different stability against the shifts of waveguides from the positions of symmetry of the cuboid. We fabricate a series of coupled waveguide resonators and experimentally verify the existence of these BICs by identifying the vanished linewidth of Fano resonance in transmission spectra. Besides, we also show that evanescent modes of waveguides play a role in the formation of BICs in a nonaxisymmetric waveguide-resonator system by tuning the angle θ between two waveguides. Consequently, the eigenmodes remain SP BICs for θ = 0° and θ = 180° but convert into accidental BICs at θ ≈ 85° or θ ≈ 275°. Such accidental BICs are also experimentally verified. Our results enrich the understanding of SP BICs and accidental BICs, and provide alternative methods of routing acoustic waves and designing acoustic devices requiring fine spectrum features, such as filters and sensors.

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Держатели документа:
Institute of Acoustics, Tongji University, Shanghai, 200092, People's Republic of China
School of Physics and Electronic Sciences, East China Normal University, Shanghai, 200241, People's Republic of China
School of Engineering and Information Technology, University of New South Wales, Canberra, Northcott Drive, Australian Capital Territory, 2600, Australia
L. V. Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAN, Krasnoyarsk 660036, Russia
Department of Mechanical Engineering, Rowan University, Glassboro, New Jersey, 08028, USA

Доп.точки доступа:
Jia, Bin; Huang, Lujun; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Huang, Sibo; Shen, Chen; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Li, Yong; Miroshnichenko, Andrey E.
}
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3.


    Enkova, Eugenia O..
    Symmetry analysis of radial profiles of magnetic skyrmions / E. O. Enkova, V. A. Stepanenko, M. S. Shustin // J. Sib. Fed. Univ. Math. Phys. - 2023. - Vol. 16, Is. 6. - P. 811-819 ; Журн. СФУ. Матем. и физ. - Cited References: 16. - S.M.S. thanks Maria Potkina as the author of magnetic skyrmionium ansantz, for fruitful discussions and her enormous contribution to this work. The authors thank D. M. Dzebisashvili for useful discussions. The work was carried out within the state assignment of Kirensky Institute of Physics. The work was supported by the Foundation for the Development of Theoretical Physics and Mathematics "BASIS" (project no. 23-1-3-52-1), Krasnoyarsk Mathematical Center of the Ministry of Science and Higher Education of the Russian Federation, Agreement no. 75-02-2023-936 . - ISSN 1997-1397. - ISSN 2313-6022
   Перевод заглавия: Анализ симметрии радиальных профилей магнитных скирмионов
Кл.слова (ненормированные):
magnetic skyrmions -- chiral interactions -- symmetry analysis of differential equations -- skyrmion bags -- магнитные скирмионы -- киральные взаимодействия -- симметрийный анализ дифференциальных уравнений -- скирмионные мешки
Аннотация: The search for analytical profiles of chiral magnetic structures such as 2D magnetic skyrmions (MS) is important for their theoretical study. Since the Euler–Lagrange (EL) equations for such excita- tions are not solved exactly, the MSs are described using analytical ansatzs. In this work, we validate one of the widely used ansatzs based on a symmetry analysis of the 1D analog of the EL equations, which characterizes the radial profile of the MS. As a development of this approach, a profiles of skyrmion bags are proposed.
Поиск аналитических профилей киральных магнитных структур типа 2D магнитных скирмионов (МС) является важным при их теоретическом описании. Поскольку уравнения Эйлера–Лагранжа (ЭЛ) для таких возбуждений не решаются точно, описание МС проводят с помощью аналитических пробных функций — анзацев. В настоящей работе проводится обоснование одного из широко используемых анзацей на основе симметрийного анализа 1D версии уравнений ЭЛ, определяющего радиальный профиль МС. В развитии такого подхода предлагаются профили скирмионных мешков с топологическими зарядами Q ≥ 0.

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

Доп.точки доступа:
Stepanenko, Vitaly A.; Shustin, M. S.; Шустин, Максим Сергеевич

}
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4.


    Shadrina, G. V.
    Optical bistability and symmetry breaking at resonance scattering of light by a finite photonic crystal with a nonlinear resonant cavity / G. V. Shadrina, E. N. Bulgakov // J. Exp. Theor. Phys. - 2022. - Vol. 135, Is. 5. - P. 632-641, DOI 10.1134/S1063776122110176. - Cited References: 50. - This study was supported by the Russian Science Foundation, grant no. 22-12-00070 . - ISSN 1063-7761. - ISSN 1090-6509
Аннотация: Optical bistability and symmetry breaking under the conditions of plane wave incidence on a system of coupled photonic crystal microcavities containing an inclusion with Kerr susceptibility have been studied. The T-matrix modal method has been generalized for the case of nonlinear microcavities supporting one monopole mode. It has been shown that both phenomena considerably depend not only on external field strength but also on angle of incidence and photonic crystal size.

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Публикация на русском языке Шадрина, Галина Владимировна. Оптическая бистабильность и нарушение симметрии при резонансном рассеянии света на конечном фотонном кристалле с нелинейной резонансной полостью [Текст] / Г. В. Шадрина, Е. Н. Булгаков // Журн. эксперим. и теор. физ. - 2022. - Т. 162 Вып. 5. - С. 646-656

Держатели документа:
Institute of Computational Modeling, Federal Research Center “Krasnoyarsk Science Center”, Siberian Branch, Russian Academy of Sciences, 660036, Akademgorodok, Krasnoyarsk, Russia
Kirenskii Institute of Physics, Federal Research Center “Krasnoyarsk Science Center”, Siberian Branch, Russian Academy of Sciences, 660036, Akademgorodok, Krasnoyarsk, Russia

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Шадрина, Галина Владимировна
}
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5.


    Fedchenko, Dmitry P..
    Photonic topological insulator based on frustrated total internal reflection in array of coupled prism resonators / D. P. Fedchenko, P. N. Kim, I. V. Timofeev // Symmetry. - 2022. - Vol. 14, Is. 12. - Ст. 2673, DOI 10.3390/sym14122673. - Cited References: 19 . - ISSN 2073-8994
   Перевод заглавия: Фотонный топологический изолятор на основе нарушенного полного внутреннего отражения в массиве призменных резонаторов
Кл.слова (ненормированные):
geometric optics -- topological insulator -- frustrated total internal reflection
Аннотация: Total internal reflection occurs at the interface between two media with different refractive indices during propagation of light rays from a medium with a higher refractive index to a medium with a lower refractive index. If the thickness of the second medium is comparable to a specific light wavelength, then total internal reflection is violated partially or completely. Based on the frustrated total internal reflection, herein we discuss a two-dimensional photonic topological insulator in an array consisting of triangular, quadrangular, or hexagonal transparent prism resonators with a narrow gap between them. An array of prism resonators allows topologically stable edge solutions (eigenwaves) similar to those studied in ring resonators. Moreover, total internal reflection occurs at different angles of incidence of light. This makes it possible to obtain a set of fundamentally new edge solutions. The light is presumably concentrated at the surface; however, in the new solutions it penetrates relatively deep into the photonic topological insulator and excites several layers of prisms positioned beyond the surface. Remarkably, the direction of light propagation is precisely biased, and therefore new solutions exhibit lower symmetry than the resonator array symmetry.

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Держатели документа:
L.V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Siberian Federal University, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Kim, Petr N.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Федченко, Дмитрий Петрович
}
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6.


   
    Electro-optical response of a monolayer polymer dispersed nematic liquid crystal film doped with surfactant / V. A. Loiko, A. V. Konkolovich, A. A. Miskevich [et al.] // Liquid Crystal Polymer Nanocomposites : Woodhead Publishing, 2022. - Chapter 7. - P. 163-211, DOI 10.1016/B978-0-12-822128-0.00006-6. - Cited References: 86
Кл.слова (ненормированные):
Polymer dispersed liquid crystal film -- Liquid crystal droplet -- Transmission -- Angular distribution of scattered light -- Quenching effect -- Symmetry breaking effect -- Photonic band gap
Аннотация: Light scattering and transmission by a monolayer polymer dispersed liquid crystal film containing liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface is considered theoretically and experimentally. The developed optical model is based on the anomalous diffraction and interference approximations of the theory of scattering of waves. It is applied to describe the interference quenching effect for the coherently transmitted light and electrically controllable symmetry breaking effect in small-angle structure of light scattered by film containing droplets with inhomogeneous anchoring. The analysis of transmittance and reflectance of the one-dimensional photonic crystals composed of monolayers is carried out. The formation of the photonic band gaps is analyzed.

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Держатели документа:
Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus
Kirensky Institute of Physics, Federal Research Center-Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Military Academy of the Republic of Belarus, Belarus

Доп.точки доступа:
Loiko, V. A.; Konkolovich, A. V.; Miskevich, A. A.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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7.


   
    Structure and properties of exotic nano- and mesodiamonds with pentagonal symmetry / F. N. Tomilin, V. A. Pomogaev, Y. A. Melchakova [et al.] // Russ. Phys. J. - 2022. - Vol. 64, Is. 11. - P. 2046-2051, DOI 10.1007/s11182-022-02553-0. - Cited References: 16. - These results were obtained within the framework of the State Assignment of the Russian Ministry of Education and Science (No. 0721-2020-0033) . - ISSN 1064-8887
Кл.слова (ненормированные):
dodecahedral symmetry -- icosahedral symmetry -- twinned diamonds -- mesoparticles
Аннотация: A comprehensive critical survey of structures of exotic nano-, meso- and microdiamonds with dodecahedral and icosahedral symmetry (N/MDPS) is presented. Due to their high dodecahedral or icosahedral symmetry, the unique complex atomic and electronic structure of N/MDPS leads to transport and mechanical properties very promising for photonic, quantum, and nanomechanical applications. To explain the nature of diamonds, theoretical models have been proposed based on the formation of twinned structures consisting of either 5 or 20 symmetrically equivalent tetrahedral and prismatic fragments of the face-centered cubic lattice with the formation of star-shaped or icosahedral clusters, respectively. It has been shown that these twinned nano- and mesodiamonds have limited dimensions due to accumulation of uncompensated structural stresses arising from the deviation of the angles between diamond <111> facets from perfect 72° in tetrahedral fragments of the face-centered cubic lattice to 70.5° between five symmetrically equivalent twinned fragments.

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Публикация на русском языке Структура и свойства экзотических нано- и мезоалмазов пентагональной симметрии [Текст] / Ф. Н. Томилин, В. А. Помогаев, Ю. А. Мельчакова [и др.] // Изв. вузов. Физика. - 2021. - Т. 64 № 11. - С. 55-60

Держатели документа:
L. V. Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
National Research Tomsk State University, Tomsk, Russian Federation
Kyungpook National University, Daegu, South Korea
Novosibirsk State University, Novosibirsk, Russian Federation
Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
Federal Research Center Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Siences, Novosibirsk, Russian Federation

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Pomogaev, V. A.; Melchakova, Y. A.; Artyushenko, P. V.; Shubin, A. A.; Volodin, A. M.; Zilberberg, I. L.; Avramov, P. V.
}
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8.


    Makarov, I. A.
    Enhanced s*-wave component of the superconducting gap in overdoped HTSC cuprates with orthorhombic distortion / I. A. Makarov, S. G. Ovchinnikov // Phys. Lett. A. - 2022. - Vol. 444. - Ст. 128226, DOI 10.1016/j.physleta.2022.128226. - Cited References: 67. - We would like to especially thank A. Bianconi for new ideas, useful discussions, and suggestions. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project “Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016 . - ISSN 0375-9601
   Перевод заглавия: Увеличенная s*-волновая компонента сверхпроводящей щели в передопированных ВТСП купратах с орторомбическим искажением
Кл.слова (ненормированные):
High-Tc superconductors -- Orthorhombic cuprates -- Hubbard model -- Superconductivity theory -- Fermi contour -- Superconducting gap symmetry
Аннотация: In this work, the concentration and temperature dependence of the superconducting gap of the HTSC cuprate in the orthorhombic phase are obtained within the framework of the Hubbard model taking into account the exchange mechanism of pairing. To elucidate the reasons for the unexpectedly large s*-wave component of the superconducting gap in the overdoped regime, the electronic structure of low-energy excitations and the k-dependent contributions of pair states to the gap components were investigated. It is shown that the s*-wave component growth results from the shallowing of the electron pocket in the region of the s*-wave component maximum.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
}
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9.


   
    Multicomponent flux growth and composition control of Cu2MnBO5:Ga ludwigites / E. Moshkina, A. Krylov, D. Kokh [et al.] // CrystEngComm. - 2022. - Vol. 24, Is. 19. - P. 3565-3575, DOI 10.1039/d2ce00258b. - Cited References: 26. - This study was supported by the Russian Science Foundation (Grant No. 21-72-00130). The Raman, X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 1466-8033
Кл.слова (ненормированные):
Bismuth compounds -- Boron compounds -- Copper compounds -- Crystal symmetry -- Energy dispersive spectroscopy -- Gallium -- Manganese oxide -- Positive ions -- Sodium compounds
Аннотация: To reach the concentration phase boundary between antiferromagnetic Cu2GaBO5 and ferrimagnetic Cu2MnBO5 ludwigites, solid solutions Cu2Mn1−xGaxBO5 (x = 0.05, 0.1, 0.15, 0.175) were grown by the flux technique using a multi-component solvent based on Bi2Mo3O12 with the addition of Na2B4O7 which significantly influenced the crystal formation and cation composition of the studied compounds. The content of the flux system was corrected taking into account the earlier established relationship of the partition coefficients of Mn2O3 and Ga2O3. The influence of the solvent components on the ludwigite crystallization was analyzed. The maximum size of the grown crystal was 1 × 1 × 4 mm3. The structure and cation composition of the grown compounds were studied using X-ray (X-ray diffraction, EDX (energy-dispersive X-ray spectroscopy)) and vibrational (Raman) spectroscopy techniques. The phase boundary of Cu2MnBO5–Cu2GaBO5 was found to be in the concentration range of x = 0.15–0.175, corresponding to a change in the monoclinic axis direction and a leap in the lattice parameters. The symmetry evolution of metal–oxygen octahedra for four nonequivalent cation positions was analyzed, and the unique crystal structure of Cu2MnBO5 demonstrated high rigidity relative to the introduction of Ga3+ cations. The polarized Raman spectra of monoclinic ludwigites were obtained and studied for the first time. A comparison of the spectra of the studied samples in both phases and orthorhombic ludwigites was made. A number of spectral features due to the monoclinic distortions in the crystal were found. In agreement with the Raman experiment, the concentration phase boundary was close to 0.15.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660037, Russian Federation
Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
St Petersburg University, St Petersburg, 199034, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Krylov, A. S.; Крылов, Александр Сергеевич; Kokh, D.; Shabanova, K.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Plyaskin, M.; Пляскин, Михаил Е.; Rostovtsev, N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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10.


   
    Plasmonic enhancement of local fields in ultrafine metal nanoparticles / L. K. Sorensen, A. D. Utyushev, V. I. Zakomirnyi [et al.] // J. Phys. Chem. C. - 2021. - Vol. 125, Is. 5. - P. 13900-13908, DOI 10.1021/acs.jpcc.1c01424. - Cited References: 65. - The work was supported by the Russian Science Foundation (project no. 18-13-00363). L.K.S acknowledges the support of Carl Tryggers Stifetelse, project CTS 18-441 . - ISSN 1932-7447
Кл.слова (ненормированные):
Crystal structure -- Electric fields -- Electromagnetic fields -- Metal nanoparticles -- Plasmonics -- Discrete interaction -- External fields -- High symmetry -- Metallic nanoparticles -- Nanoscale particles -- Near field imaging -- Optical response -- Plasmon field -- Plasmonic nanoparticles
Аннотация: We present an analysis of ultrafine metallic nanoparticles (1-15 nm) with respect to electromagnetic field generation by plasmonic excitations. A number of structures with different symmetries and geometries are studied in order to analyze the distributions of plasmonically generated near-electric fields and the concentration of hot and cold spots around the particles. The study is made possible by the recent development of an extended discrete interaction model (Ex-DIM) where the explicit dependency of the plasmonic spectra on the structure and composition of particles in the range of 1-15 nm is accounted for. With the Ex-DIM, the optical response of the internal crystal structure of the nanoscale particles can be visualized, thereby making it possible to predict the dependence of the generated local fields with respect to the position of the particles relative to the external field polarization. The results indicate rather surprising concentrations of the plasmon fields in very confined hot spots also in cases when the particles retain a high symmetry. The consequence of the findings of this study when using small symmetric nanoparticles for near-field imaging is briefly discussed.

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Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, SE-751 20, Sweden
Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, Stockholm, SE-10691, Sweden
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Computational Modelling, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
L. V. Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
Federal Siberian Research Clinical Centre under Fmba of Russia, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Sorensen, L. K.; Utyushev, A. D.; Zakomirnyi, V. I.; Gerasimov, V. S.; Ershov, A. E.; Polyutov, S. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Agren, H.
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