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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Sadreev A. F.
Заглавие : Ab-initio investigation of thermoactivated directional transport of hydrogen molecules inside narrow carbon nanotubes
Место публикации : Physica status solidi B - Basic Solid State Physics. - 2009. - Т. 246, № 11-12. - P.2598-2601. - ISSN 0370-1972, DOI 10.1002/pssb.200982285. - ISSN 1521-3951(eissn)
ГРНТИ : 31
РИНЦ
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Huang, Lujun, Huang, Sibo, Shen, Chen, Yves, Simon, Pilipchuk A. S., Ni, Xiang, Kim, Seunghwi, Chiang, Yan Kei, Powell, David A., Zhu, Jie, Cheng, Ya, Li, Yong, Sadreev A. F., Alu, Andrea, Miroshnichenko, Andrey E.
Заглавие : Acoustic resonances in non-Hermitian open systems
Колич.характеристики :17 с
Место публикации : Nat. Rev. Phys. - 2024. - Vol. 6, Is. 1. - P.11-27. - ISSN 25225820 (eISSN), DOI 10.1038/s42254-023-00659-z
Примечания : Cited References: 288. - L.H. and A.E.M. were supported by the Australian Research Council Discovery Project (DP200101353) and the UNSW Scientia Fellowship programme. S.H. and Y.L. were supported by the Shanghai Science and Technology Committee (grant nos. 21JC1405600). C.S. was supported by the US National Science Foundation under grant no. CMMI-2137749. S.Y., X.N., S.K. and A.A. were supported by the Air Force Office of Scientific Research and Simons Foundation. A.S.P and A.F.S acknowledge the state assignment of Kirensky Institute of Physics. Y.K.C. and D.A.P. were supported by the Australian Research Council Discovery Project (grant no. DP200101708)
Аннотация: Acoustic resonances in open systems, which are usually associated with resonant modes characterized by complex eigenfrequencies, play a fundamental role in manipulating acoustic wave radiation and propagation. Notably, they are accompanied by considerable field enhancement, boosting interactions between waves and matter, and leading to various exciting applications. In the past two decades, acoustic metamaterials have enabled a high degree of control over tailoring acoustic resonances over a range of frequencies. Here, we provide an overview of recent advances in the area of acoustic resonances in non-Hermitian open systems, including Helmholtz resonators, metamaterials and metasurfaces, and discuss their applications in various acoustic devices, including sound absorbers, acoustic sources, vortex beam generation and imaging. We also discuss bound states in the continuum and their applications in boosting acoustic wave–matter interactions, active phononics and non-Hermitian acoustic resonances, including phononic topological insulators and the acoustic skin effect.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berggren K. F., Sadreev A. F., Starikov A. A.
Заглавие : Crossover from regular to irregular behavior in current flow through open billiards
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2002. - Vol. 66, Is. 1. - Ст.16218. - ISSN 1539-3755, DOI 10.1103/PhysRevE.66.016218
Примечания : Cited References: 36
Предметные рубрики: PHASE SINGULARITIES
NODAL POINTS
WAVE-FIELDS
QUANTUM
STREAMLINES
CONDUCTANCE
VORTICES
CHAOS
Ключевые слова (''Своб.индексиров.''): eigenvalues and eigenfunctions--mathematical models--networks (circuits)--random processes--resonance--signal processing--spurious signal noise--bursting time series--coherence resonance--power spectrum--stochastic resonance--chaos theory
Аннотация: We discuss signatures of quantum chaos in terms of distributions of nodal points, saddle points, and streamlines for coherent electron transport through two-dimensional billiards, which are either nominally integrable or chaotic. As typical examples of the two cases we select rectangular and Sinai billiards. We have numerically evaluted distribution functions for nearest distances between nodal points and found that there is a generic form for open chaotic billiards through which a net current is passed. We have also evaluated the distribution functions for nodal points with specific vorticity (winding number) as well as for saddle points. The distributions may be used as signatures of quantum chaos in open systems. All distributions are well reproduced using random complex linear combinations of nearly monochromatic states in nominally closed billiards. In the case of rectangular billiards with simple sharp-cornered leads the distributions have characteristic features related to order among the nodal points. A flaring or rounding of the contact regions may, however, induce a crossover to nodal point distributions and current flow typical for quantum chaos. For an irregular arrangement of nodal points, as for example in the Sinai billiard, the quantum flow lines become very complex and volatile, recalling chaos among classical trajectories. Similarities with percolation are pointed out.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Mankov Y. I., Sadreev A. F.
Заглавие : Stochastic-instability of classical homogeneous SU(2) by U(1) fields with spontaneously broken symmetry
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1985. - Vol. 88, Is. 3. - P.705-714. - ISSN 0044-4510
Примечания : Cited References: 19
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5.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Balyzin M., Sadrieva Z., Belyakov M. A., Kapitanova P., Sadreev A. F., Bogdanov A.
Заглавие : Bound state in the continuum in 1D chain of dielectric disks: Theory and experiment
Коллективы : International Conference on Metamaterials and Nanophotonics
Место публикации : J. Phys. Conf. Ser. - 2018. - Vol. 1092: 3rd International Conference on Metamaterials and Nanophotonics, METANANO 2018 (17 - 21 September 2018). - Ст.012012. - , DOI 10.1088/1742-6596/1092/1/012012
Примечания : Cited References: 11. - This work is supported by RSF (17-12-01581)
Ключевые слова (''Своб.индексиров.''): 1-d chains--bound state--ceramic disks--dielectric disks--ghz frequencies--material loss--quadratic growth--zero angular momentum
Аннотация: In this work we experimentally observe a symmetry protected optical bound state in the continuum (BIC) with zero angular momentum in 1D array of ceramic disks at GHz frequencies. We analyze the dependence of Q factor of BIC on the number of the disks and the level of the material losses. We confirmed theoretical prediction about quadratic growth of the Q factor with the number of the disks and its following saturation due to material losses.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E.N., Sadreev A.F.
Заглавие : Bound States in Photonic Fabry-Perot Resonator with Nonlinear Off Channel Defects
Место публикации : Phys. Rev. B. - 2010. - Vol. 81. - С. 115128-12
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyapina A. A., Maksimov D. N., Pilipchuk A. S., Sadreev A. F.
Заглавие : Bound states in the continuum in open acoustic resonators
Место публикации : J. Fluid Mech. - 2015. - Vol. 780. - P.370-387. - ISSN 0022-1120, DOI 10.1017/jfm.2015.480
Примечания : Cited References: 48. - This work has been supported by Russian Science Foundation through grant 14-12-00266.
Предметные рубрики: TRAPPED MODES
FANO RESONANCES
COMPLEX RESONANCES
PARALLEL PLATES
SIDE-BRANCHES
WAVE-GUIDES
ABSORPTION
TRANSPORT
CHANNELS
SYSTEM
Ключевые слова (''Своб.индексиров.''): aeroacoustics--noise control--wave scattering
Аннотация: We consider bound states in the continuum (BSCs) or embedded trapped modes in two- and three-dimensional acoustic axisymmetric duct-cavity structures. We demonstrate numerically that, under variation of the length of the cavity, multiple BSCs occur due to the Friedrich-Wintgen two-mode full destructive interference mechanism. The BSCs are detected by tracing the resonant widths to the points of the collapse of Fano resonances where one of the two resonant modes acquires infinite life-time. It is shown that the approach of the acoustic coupled mode theory cast in the truncated form of a two-mode approximation allows us to analytically predict the BSC frequencies and shape functions to a good accuracy in both two and three dimensions. © 2015 Cambridge University Press.
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F., Rotter I.
Заглавие : Bound states in the continuum in open Aharonov-Bohm rings
Место публикации : JETP Letters. - 2006. - Vol. 84, Is. 8. - P.430-435. - ISSN 0021-3640, DOI 10.1134/S0021364006200057
Примечания : Cited References: 33
Предметные рубрики: WAVE-GUIDE
QUANTUM
TRANSMISSION
SCATTERING
BILLIARDS
ELECTRON
Аннотация: Using the formalism of the effective Hamiltonian, we consider bound states in a continuum (BIC). They are nonhermitian effective Hamiltonian eigenstates that have real eigenvalues. It is shown that BICs are orthogonal to open channels of the leads, i.e., disconnected from the continuum. As a result, BICs can be superposed to a transport solution with an arbitrary coefficient and exist in a propagation band. The one-dimensional Aharonov-Bohm rings that are opened by attaching single-channel leads to them allow exact consideration of BICs. BICs occur at discrete values of the energy and magnetic flux; however, it's realization strongly depends on the way to the BIC point.
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9.

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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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pankin P. S., Yang J.-H., Wu B.-R., Chen K. -P., Vetrov S. Ya., Timofeev I. V., Sadreev A. F.
Заглавие : Brewster-tilted Tamm plasmon-polariton with tunable Q factor
Коллективы : Progress in Electromagnetics Research Symposium
Место публикации : Progress in Electromagnetics Research Symposium: Abstracts. - 2018. - P.789
Примечания : Cited References: 3
Аннотация: Tamm plasmon polariton (TPP) is an electromagnetic state at the interface of a metal and a dielectric Bragg mirror with slow propagation along the interface [1] similar to the Tamm state of electron localized at a semiconductor or metal surface. Generally the TPP supports both TE- and TM-polarizations. It can be utilized for narrowband filters, sensors, absorbers, emitters and polariton lasers. We consider a one-dimensional photonic crystal conju- gated with an opaque metal layer (Fig. 1(a)). Although made of isotropic materials the photonic crystal differentiates polarizations. At Brewster angle it becomes transparent for TM-waves (mag- netic field orthogonal to the incidence plane) and still maintains opaqueness for TE-waves. So, Brewster-tilted TPP is TE-polarized only. For the purpose of the TPP energy release into TM- wave we introduce a thin anisotropic layer at the interface. Then we can freely rotate the sample in the plane of the layers or equivalently rotate the incident light beam along the Brewster-angled cone. The azimuthal angle φ between the incidence plane and the anisotropic layer optical axis governs the Q factor of the Brewster-tilted TPP by coupling to the TM-wave relaxation channel (Fig. 1(b)). At φ = 0◦ the Brewster-tilted TPP can be considered as a symmetry-protected bound state in the continuum [2]. This keeps valid for deviations from Brewster angle until TM-stopband is narrow. The considered layered structure is easier in fabrication compared to previously proposed in [3], which facilitates numerous applications.
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