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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F.
Заглавие : Lattice distortion generates bound states in the continuum
Колич.характеристики :1 с
Место публикации : Sci. China: Phys. Mech. Astron. - 2024. - Vol. 67, Is. 3. - Ст.234231. - ISSN 16747348 (ISSN), DOI 10.1007/s11433-023-2282-8. - ISSN 18691927 (eISSN)
Примечания : Cited References: 4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasnov A. I., Pankin P. S., Romanenko G. A., Sutormin V. S., Maksimov D. N., Vetrov S. Ya., Timofeev I. V.
Заглавие : Photonic bound states in the continuum governed by heating
Колич.характеристики :6 с
Место публикации : Phys. Rev. E. - 2024. - Vol. 109, Is. 5. - Ст.054703. - ISSN 24700045 (ISSN), DOI 10.1103/PhysRevE.109.054703. - ISSN 24700053 (eISSN)
Примечания : Cited References: 50. - This work was supported by the Russian Science Foundation under Grant No. 22-22-00687
Аннотация: A photonic crystal microcavity with the liquid crystal resonant layer tunable by heating has been implemented. The multiple vanishing resonant lines corresponding to optical bound states in the continuum are observed. The abrupt change in the resonant linewidth near the vanishing point can be used for temperature sensing.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jia, Bin, Huang, Lujun, Pilipchuk A. S., Huang, Sibo, Shen, Chen, Sadreev A. F., Li, Yong, Miroshnichenko, Andrey E.
Заглавие : Bound states in the continuum protected by reduced symmetry of three-dimensional open acoustic resonators
Место публикации : Phys. Rev. Appl. - 2023. - Vol. 19, Is. 5. - Ст.054001. - ISSN 23317019 (eISSN), DOI 10.1103/PhysRevApplied.19.054001
Примечания : 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
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Maksimov D. N., Pankin P. S., Ye, Ming-Jyun, Chen, Kuo-Ping, Timofeev I. V.
Заглавие : Enhanced light absorption in Tamm metasurface with a bound state in the continuum
Место публикации : Photonics Nanostruct. Fundam. Appl. - 2023. - Vol. 55. - Ст.101148. - ISSN 15694410 (ISSN), DOI 10.1016/j.photonics.2023.101148. - ISSN 15694429 (eISSN)
Примечания : Cited References: 47. - This research was funded by the Russian Science Foundation (project no. 22-42-08003). This work was supported by the Higher Education Sprout Project of the National Yang Ming Chiao Tung University and Ministry of Education and the National Science and Technology Council (NSTC 109-2628-E-007 -003 -MY3; 111-2923-E007 -008 -MY3; 111-2628-E-007-021)
Аннотация: We consider light absorption in a germanium grating placed on top of photonic-crystalline substrate. Such a system supports an optical Tamm state decoupled from the continuous spectrum with its frequency within the photonic band gap. We have demonstrated that application of the Tamm state makes in possible to engineer extremely narrow absorber which provides a 100 % absorption in a semiconductor grating in the critical coupling regime. The proposed design may be used at both normal and oblique incidence at the telecom wavelength.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molokeev M. S., Kostyukov A. S., Ershov A. E., Maksimov D. N., Gerasimov V. S., Polyutov S. P.
Заглавие : Infrared bound states in the continuum: random forest method
Колич.характеристики :4 с
Место публикации : Opt. Lett. - 2023. - Vol. 48, Is. 17. - P.4460-4463. - ISSN 01469592 (ISSN), DOI 10.1364/OL.494629. - ISSN 15394794 (eISSN)
Примечания : Cited References: 42. - Ministry of Science and Higher Education of the Russian Federation (FSRZ-2023-0006)
Аннотация: In this Letter, we consider optical bound states in the continuum (BICs) in the infrared range supported by an all-dielectric metasurface in the form of subwavelength dielectric grating. We apply the random forest machine learning method to predict the frequency of the BICs as dependent on the optical and geometric parameters of the metasurface. It is found that the machine learning approach outperforms the standard least square method at the size of the dataset of ≈4000 specimens. It is shown that the random forest approach can be applied for predicting the subband in the infrared spectrum into which the BIC falls. The important feature parameters that affect the BIC wavelength are identified.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aksenov S. V.
Заглавие : Probing Majorana bound states through an inhomogeneous Andreev double dot interferometer
Место публикации : Phys. Rev. B. - 2023. - Vol. 107, Is. 8. - Ст.085417. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.107.085417. - ISSN 24699969 (eISSN)
Примечания : Cited References: 60. - We thank A. D. Fedoseev and M. S. Shustin for fruitful discussions. The study was supported by Russian Science Foundation, Project No. 19-12-00167
Аннотация: In modern experiments with hybrid superconducting (SC)/semiconducting nanowires the presence of zero-energy Andreev bound states (ABSs), characterized by a partial overlap of the Majorana wave functions, is a common problem that significantly complicates the detection of a genuine Majorana bound state (MBS). In this article, taking into account spatial inhomogeneity of experimentally investigated nanowire samples, we study interference transport features of a curved heterostructure in which two normal wires (or arms) are separated by a superconducting wire. Since Andreev reflection on the two N/S interfaces with smoothly changing electrostatic and SC pairing potentials results in the emergence of bound states, the low-energy interference transport is described in the framework of the model of two noninteracting Andreev levels or the Andreev double quantum dot. A set of limiting cases is analyzed allowing us to highlight the interference properties that are unique for the different types of ABSs, such as bulk ABS, inhomogeneous ABS, and MBS. In particular, considerable attention is paid to the features of the Aharonov-Bohm (AB) effect. It is shown that the response of each state can be recognized analyzing both AB period and extrema positions of the conductance oscillations which take place without any fine-tuning of the system parameters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Каравайский, Андрей Юрьевич, Лукин, Юрий Иванович
Заглавие : Влияние диэлектрических релаксаций почвенной воды на температурную зависимость диэлектрической проницаемости почвы
Место публикации : Журн. радиоэлектрон. - 2023. - № 1. - Ст.4. - ISSN 16841719 (eISSN), DOI 10.30898/1684-1719.2023.1.4; J. Radio Electron.
Примечания : Библиогр.: 23. - Работа выполнена при финансовой поддержке Российского научного фонда и Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научного проекта № 22-27-20112
Аннотация: С помощью обобщенной рефракционной диэлектрической модели смеси изучено влияние спектров относительной диэлектрической проницаемости связанной и несвязанной воды в минеральной почве на характер температурной зависимости относительной диэлектрической проницаемости естественной минеральной почвы, с содержанием глинистой фракции 41,3 %, в диапазоне частот электромагнитного поля от 50 МГц до 15 ГГц. Изучены причины появления пересечений спектров относительной диэлектрической проницаемости минеральной почвы, полученных при различных температурах, но для образца одной влажности. Доказано, что появление такой точки пересечения в диапазоне частот до 1,5 ГГц связано с эффектом Максвелла-Вагнера в связанной воде. Изучены зависимости частоты точки пересечения спектров относительной диэлектрической проницаемости минеральной почвы от температуры и объемного содержания связанной и несвязанной воды.The influence of the dielectric constant spectra of bound and unbound water in mineral soil on the temperature dependences of the dielectric constant of mineral soil in the electromagnetic field frequency range from 50 MHz to 15 GHz was studied. The reasons for the appearance of the crossover frequency of the dielectric constant of mineral soil, obtained at different temperatures, but for a sample of the same moisture, were studied. It was proved that the appearance of crossover points in the frequency range up to 1.5 GHz is related to the Maxwell-Wagner effect in bound water. The dependences of the value of the crossover frequency of the dielectric constant of mineral soil on temperature and the volume content of bound and unbound water were studied.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Каравайский, Андрей Юрьевич, Лукин, Юрий Иванович, Погорельцев, Евгений Ильич
Заглавие : Диэлектрический метод измерения содержания незамерзшей воды в минеральной почве
Место публикации : Криосфера Земли. - 2023. - Т. 27, № 1. - С. 23-34. - ISSN 15607496 (ISSN), DOI 10.15372/KZ20230103; Earth’s Cryosphere. - ISSN 25419994 (ISSN eng. vers.)
Примечания : Библиогр.: 41
Аннотация: Путем совместных измерений содержания незамерзшей воды в мерзлой естественной минеральной почве диэлектрическим, калориметрическим и контактным методами подтверждена возможность практического применения диэлектрического метода для измерения содержания незамерзшей воды. Количество незамерзшей воды в калориметрическом и контактном методах оценивалось путем измерения влажности образцов за счет содержания незамерзшей воды, в диэлектрическом методе - путем измерения максимального содержания связанной воды. Определено, что значения влажности за счет содержания незамерзшей воды, измеренные с помощью калориметрического метода для образцов одного типа почвы с разной первоначальной влажностью, различаются в пределах 17 %. Значения влажности за счет содержания незамерзшей воды, найденные контактным методом, и значения содержания связанной воды в мерзлой почве, найденные диэлектрическим методом, лежат в диапазоне значений, измеренных с помощью калориметрического метода. Значения содержания связанной воды, найденные диэлектрическим методом, и значения влажности за счет содержания незамерзшей воды, полученные контактным методом, различаются не более чем на 17 %.The possibility of using the dielectric method to determine the unfrozen water content in the frozen natural mineral soil was proved by establishing the relationship between the contents of soil water forms measured by the dielectric, calorimetric, and contact methods. The unfrozen water content in the sample was measured by the calorimetric and contact methods. In the dielectric method, it was estimated by measuring the maximum content of bound water. The unfrozen water content measured by the calorimetric method in the soil samples with different initial water contents varied within 17 %. The unfrozen water content measured by the contact method and the bound water content determined by the dielectric method were within the ranges of values determined by the calorimetric method. The values of the bound water content obtained by the dielectric method and the unfrozen water content obtained by the contact method differed by no more than 17 %.
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Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Bulgakov E. N., Pilipchuk A. S., Sadreev A. F.
Заглавие : Bound states in the continuum in dielectric resonators embedded into metallic waveguide
Место публикации : All-dielectric nanophotonics/ ed.: A. S. Shalin [et al.]: Elsevier, 2023. - Chapt. 7. - P.185-212. - (Nanophotonics series)
Примечания : Cited References: 97. - РНФ № 22-12-00070
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Bikbaev R. G., Tyryshkina L. E., Vetrov S. Ya., Timofeev I. V.
Заглавие : Tuning Q-factor and perfect absorption using coupled Tamm states on polarization-preserving metasurface
Колич.характеристики :12 с
Место публикации : Photonics. - 2023. - Vol. 10, Is. 12. - Ст.1391. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10121391
Примечания : Cited References: 58
Аннотация: The circular polarization of light flips its handedness after a conventional metallic mirror reflection. Therefore, a polarization-preserving metasurface is a crucially important element in a series of chiral photonic structures. They include tunable cholesteric LCs and anisotropic photonic crystals. Chiral structures are rich in interfacial localized modes including Tamm states. In this report, coupled modes formed as a result of the interaction between two chiral optical Tamm states or a chiral optical Tamm state and a chiral Tamm plasmon polariton are analytically and numerically investigated. It is shown that the effective control of coupled modes can be carried out by changing the pitch of the cholesteric and the angle between the optical axis of the cholesteric and the polarization-preserving anisotropic mirror. The influence of the metasurface period on the spectral characteristics of coupled modes is investigated. The possibility of realizing a bound state in the continuum of the Friedrich–Wintgen type, resulting from the destructive interference of coupled modes, which leads to the collapse of the resonance line corresponding to the chiral optical Tamm state, has been demonstrated.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karavayskiy A. Yu., Lukin Y. I.
Заглавие : Influence of dielectric relaxations of soil water on the temperature dependence of soil permittivity
Колич.характеристики :10 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 12. - P.1190-1199. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X24700206. - ISSN 15626911 (eISSN)
Примечания : Cited References: 23. - This work was supported by the Russian Science Foundation and the Krasnoyarsk Regional Fund of Science and Technology Support within the framework of scientific project no. 22-27-20112
Аннотация: Using a generalized refractive mixture dielectric model, the influence of the relative permittivity spectra of bound and unbound water in mineral soil on the nature of the temperature dependence of the relative permittivity of natural mineral soil, with a clay fraction content of 41.3%, was studied in the electromagnetic field frequency range from 50 MHz to 15 GHz. The causes of the emergence of intersections in the relative permittivity spectra of mineral soil, obtained at different temperatures but for a sample of the same moisture content, have been studied. It has been proved that the emergence of such an intersection point in the frequency range up to 1.5 GHz is due to the Maxwell–Wagner effect in bound water. The dependences of the frequency of the intersection point of the relative permittivity spectra of mineral soil on the temperature and volumetric content of bound and unbound water have been studied.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. S., Gerasimov V. S., Ershov A. E., Bulgakov E. N., Sadreev A. F.
Заглавие : Size-selective optical trapping of nanoparticles with bound states in the continuum
Колич.характеристики :6 с
Место публикации : Opt. Lasers Eng. - 2023. - Vol. 171. - Ст.107797. - ISSN 01438166 (ISSN), DOI 10.1016/j.optlaseng.2023.107797. - ISSN 18730302 (eISSN)
Примечания : Cited References: 46. - The work was supported by Russian Science Foundation Grant No. 22-12-00070
Аннотация: We consider a waveguide with a symmetrically integrated silicon cylinder. This design supports a symmetry protected bound state in the continuum (BIC) with Q-factor controlled by slight displacement of the cylinder. When excited by a TE10 electromagnetic wave, the BIC leads to giant optical forces near the cylinder. These forces have a strong impact on nanoparticles being dragged by liquid flow over the waveguide as they approach the cylinder. At the same time, the nanoparticles perturb the resonant frequency of the BIC with a value proportional to their volume and proximity to the cylinder. Therefore, the interplay between the resonant width of the BIC and the nanoparticle frequency perturbation determines the positions of the nanoparticles trapped around the cylinder. This paradigm demonstrates resonant self-trapping and sorting of nanoparticles by size through BIC excitation. We highlight the extreme sensitivity of these effects to the frequency of the injected TE wave. Additionally, we show that these results remain valid when considering the finite conductivity of metal waveguides.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Shadrina, Galina, Sadreev A. F., Pichugin K. N.
Заглавие : Super-bound states in the continuum through merging in grating
Колич.характеристики :11 с
Место публикации : Phys. Rev. B. - 2023. - Vol. 108, Is. 12. - Ст.125303. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.108.125303. - ISSN 24699969 (eISSN)
Примечания : Cited References: 70. - We thankful Yi Xu and Zhanyuan Zhang for numerous fruitful discussions. The work was supported by Russian Science Foundation Grant No. 22-12-00070
Аннотация: We consider bound states in the continuum (BICs) in grating composed of infinitely long silicon rods of rectangular cross-section. We reveal merging off-Γ Friedrich-Wintgen BIC with symmetry protected BIC. We present CMT and multipole decomposition theory, complementing each other, to analyze the merging phenomenon. The theories show a crossover of the behavior of Q factor from standard inverse square law k-2x,z towards extremely fast boosting law k-6x,z in momentum space. In turn that crossover gives rise to another crossover from Q ~ N2 to Q ~ N3 for symmetry protected quasi-BIC in finite grating of N rods owing to suppression of radiation leakage of quasi-BIC mode from surface of grating. As a result, the Q factor of quasi-BIC is determined by residual leakage from ends of grating. We show numerically that this leakage can also be suppressed considerably if grating is stretched from the ends.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Precise size sorting of nanoparticles by bound states in the continuum in a dual finite grating
Колич.характеристики :4 с
Место публикации : Opt. Lett. - 2023. - Vol. 48, Is. 17. - P.4705-4708. - ISSN 01469592 (ISSN), DOI 10.1364/OL.496198. - ISSN 15394794 (eISSN)
Примечания : Cited References: 37. - We acknowledge discussions with K.N. PichuginThe work was supported by Russian Science Foundation; grant no. 22-12-00070
Аннотация: We consider two parallel dielectric gratings (dual grating) which support accidental bound states in the continuum (BICs) mostly localized between gratings. As distinctive to true periodical BICs in an infinite dual grating, the enveloping intensity of quasi-BICs in a finite dual grating behaves as a standing wave. That behavior is a key property to trap nanoparticles into selected cells of the dual grating sorted by sizes of nanoparticles dragged by liquid flowing between gratings. For excitation of quasi-BIC with high quality factor by an electromagnetic plane wave with normal incidence and power 1 mW/µm2 we show high efficiency of sorting of nanoparticles by sizes.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Gerasimov V. S., Bogdanov A. A., Polyutov S. P.
Заглавие : Enhanced sensitivity of an all-dielectric refractive index sensor with an optical bound state in the continuum
Место публикации : Phys. Rev. A. - 2022. - Vol. 105, Is. 3. - Ст.033518. - ISSN 24699926 (ISSN), DOI 10.1103/PhysRevA.105.033518
Примечания : Cited References: 49. - The theoretical part of the research was supported by the Ministry of Science and High Education of Russian Federation, Project No. FSRZ-2020-0008, by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (Grant No. 20-42-240003). The numerical part is supported by the Russian Science Foundation (21-72-30018)
Аннотация: The sensitivity of a refractive index sensor based on an optical bound state in the continuum is considered. Applying Zel'dovich perturbation theory we derived an analytic expression for bulk sensitivity of an all-dielectric sensor utilizing symmetry protected in-Γ optical bound states in a dielectric grating. The upper sensitivity limit is obtained. A recipe is proposed for obtaining the upper sensitivity limit by optimizing the design of the grating. It is shown that the maximal sensitivity can be achieved regardless to the permittivity of the constituent dielectric of the system. The results are confirmed through direct numerical simulations.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aksenov S. V.
Заглавие : Manifestation of Majorana modes overlap in the Aharonov-Bohm effect
Место публикации : J. Phys. Condens. Matter. - 2022. - Vol. 34, Is. 25. - Ст.255301. - ISSN 1361648X (ISSN), DOI 10.1088/1361-648X/ac62a7
Примечания : Cited References: 52. - We acknowledge fruitful discussions with A D Fedoseev and M S Shustin. The reported study was funded by Russian Foundation for Basic Research (Project No. 20-02-00015), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project ‘Study of edge states in one- and two-dimensional topological superconductors’ (No. 20-42-243005)
Аннотация: One of the key features of the Majorana bound states emerging in topological superconducting (SC) wires is increasing oscillations of their energy under the growth of magnetic field or chemical potential due to concomitant enhancement of hybridization of the Majorana mode wave functions initially localized at the opposite edges of the structure. In this study we found that the other consequence of it is a shift of Aharonov–Bohm (AB) oscillations of linear-response conductance in an interference device where two ends of the SC wire connected with a normal contact via non-SC wires (arms). In addition, it is accompanied by an oscillation period doubling. The numerical calculations for the spinful system are supported by the analytical results for different spinless models allowing to track the conductance evolution as the hybridization of the Majorana modes increases. It is shown that since the coupling between the different arms and normal contact is implemented only via the different-type Majoranas the AB oscillations acquire a fundamental π/2 shift in comparison with the effect for an analogous system of zero-energy quantum dots.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Bulgakov E. N., Pilipchuk A. S., Miroshnichenko A., Huang L.
Заглавие : Degenerate bound states in the continuum in square and triangular open acoustic resonators
Место публикации : Phys. Rev. B. - 2022. - Vol. 106, Is. 8. - Ст.085404. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.106.085404
Примечания : Cited References: 43
Аннотация: We consider square and equilateral triangular open acoustic resonators with the C4v and C3v symmetries, respectively. There is a unique property of square and triangular resonators of accidental number fourfold degeneracy of eigenstates that gives rise to twofold-degenerate Friedrich-Wintgen (FW) bound states in the continuum (BICs). Compared to usual FW BICs, the degenerate FW BICs maintain high Q factor in wide range of the size of resonators. That removes the fabrication difficulties of the proper choice of resonator. The presence of degenerate BICs in triangular resonators is extremely sensitive to switch output flows by small perturbations with 100% efficiency.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. S., Gerasimov V. S., Ershov A. E., Bulgakov E. N.
Заглавие : Ring of bound states in the continuum in the reciprocal space of a monolayer of high-contrast dielectric spheres
Коллективы : RFBR Russian Foundation for Basic Research (RFBR); Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [20-42-240003]; Ministry of Science and Higher Education of the Russian Federation [FSRZ-20200008]
Место публикации : Phys. Rev. B. - 2022. - Vol. 105, Is. 7. - Ст.075404. - ISSN 2469-9950, DOI 10.1103/PhysRevB.105.075404. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 43. - This research was supported by RFBR, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, Project No. 20-42-240003, by the Ministry of Science and Higher Education of the Russian Federation, Project No. FSRZ-20200008
Предметные рубрики: PHOTONIC BAND-STRUCTURE
FANO RESONANCES
SCATTERING
Аннотация: We consider light scattering by two-dimensional arrays of high-index dielectric spheres arranged into a triangular and square lattices. We demonstrate the appearance of the double degenerate accidental super-BIC modes with extremely suppressed radiative losses in the vicinity of the Γ point of the leaky band of the triangular lattice. Two rings of BICs (circular lines of BICs in reciprocal space) with different polarization appear at the point of the super-BIC destruction. The radius of the ring BIC (RBIC) changes as a function of the sphere's radius. We propose a generic analytical expression to describe the behavior of the guided mode decay rate as a function of the sphere radii and the wave vector in the vicinity of the RBIC. The results are explained using a multipolar approach.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Shustin M. S., Aksenov S. V., Zlotnikov A. O., Fedoseev A. D., Mitskan V. A., Kagan M. Yu.
Заглавие : Topological superconductivity and Majorana states in low-dimensional systems
Место публикации : Phys.-Usp. - 2022. - Vol. 65, Is. 1. - P.2-39. - ISSN 10637869 (ISSN), DOI 10.3367/UFNe.2021.03.038950
Примечания : Cited References: 320. - This review was prepared in the framework of the Russian Foundation for Basic Research (RFBR) grant 19-12-50087. Part of the presented results were obtained in the framework of RFBR projects 19-02-00348, 20-32-70059, and 20-02-00015. S V A expresses his gratitude for support through a grant from the President of the Russian Federation, MK-1641.2020.2. A O Z and M S Sh express their gratitude to the Theoretical Physics and Math ematics Advancement Foundation “BASIS”. M Yu K thanks the Program for Basic Research of the NationalResearch University Higher School of Economics for support
Аннотация: We discuss the properties of topologically nontrivial superconducting phases and the conditions for their realization in condensed matter, the criteria for the appearance of elementary Majorana-type excitations in solids, and the corresponding principles and experimental methods for identifying Majorana bound states (MBSs). Along with the well-known Kitaev chain and superconducting nanowire (SW) models with spin-orbit coupling in an external magnetic field, we discuss models of quasi-two-dimensional materials in which MBSs are realized in the presence of noncollinear spin ordering. For finite-length SWs, we demonstrate a cascade of quantum transitions occurring with a change in the magnetic field, accompanied by a change in the fermion parity of the ground state. The corresponding anomalous behavior of the magnetocaloric effect can be used as a tool for identifying MBSs. We devote considerable attention to the analysis of the transport characteristics of devices that contain topologically nontrivial materials. The results of studying the conductance of an Aharonov-Bohm ring whose arms are connected by an SW are discussed in detail. An important feature of this device is the appearance of Fano resonances in the dependence of conductance on the magnetic field when the SW is in a topologically nontrivial phase. We establish a relation between the characteristics of such resonances and the spatial structure of the lowest-energy SW state. The conditions for the occurrence of an MBS in the phase of the coexistence of chiral d+id superconductivity and 120-degree spin ordering are determined in the framework of the t-J-V model on a triangular lattice. We take electron-electron interactions into account in discussing the topological invariants of low-dimensional superconducting materials with noncollinear spin ordering. The formation of Majorana modes in regions with an odd value of a topological ℤ invariant is demonstrated. The spatial structure of these excitations in the Hubbard fermion ensemble is determined.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankin P. S., Maksimov D. N., Timofeev I. V.
Заглавие : Bound state in the continuum in an anisotropic photonic crystal supported by a full-wave phase plate
Место публикации : J. Opt. Soc. Am. B. - 2022. - Vol. 39, Is. 4. - P.968-972. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.451034
Примечания : Cited References: 34. - Council on Grants of the President of the Russian Federation (MK-4012.2021.1.2). The authors are grateful to V.A. Stepanenko (Siberian Federal University) for helpful discussions. P. S. Pankin is grateful for the support of the President of the Russian Federation
Аннотация: We consider bound states in the continuum (BICs) in a 1D multilayered system of an anisotropic defect layer embedded into an anisotropic photonic crystal. We analytically demonstrate that an anisotropic defect layer embedded into anisotropic photonic crystal supports accidental BICs. These BICs can be transformed to high-Q resonances by variation of one of the system's parameters. At the same time, the BICs are remarkably robust in the sense that a true BIC can be recovered by further tuning any of the system's other parameters, leading to tunability of the resonance position.
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