Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rotter I., Sadreev A. F.
Заглавие : Influence of branch points in the complex plane on the transmission through double quantum dots
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2004. - Vol. 69, Is. 6. - Ст.66201. - ISSN 1539-3755, DOI 10.1103/PhysRevE.69.066201
Примечания : Cited References: 25
Предметные рубрики: ELECTRON-ATOM SCATTERING
S-MATRIX
DOUBLE POLES
CONTINUUM
SYSTEM
MODEL
Ключевые слова (''Своб.индексиров.''): eigenvalues and eigenfunctions--hamiltonians--mathematical models--matrix algebra--probability--resonance--scattering--wave propagation--branch points--open quantum systems--propagating modes--quantum computing devices--semiconductor quantum dots
Аннотация: We consider single-channel transmission through a double quantum dot system consisting of two single dots that are connected by a wire and coupled each to one lead. The system is described in the framework of the S matrix theory by using the effective Hamiltonian of the open quantum system. It consists of the Hamiltonian of the closed system (without attached leads) and a term that accounts for the coupling of the states via the continuum of propagating modes in the leads. This model allows one to study the physical meaning of branch points in the complex plane. They are points of coalesced eigenvalues and separate the two scenarios with avoided level crossings and without any crossings in the complex plane. They influence strongly the features of transmission through double quantum dots.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pichugin K., Schanz H., Seba P.
Заглавие : Effective coupling for open billiards
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2001. - Vol. 64, Is. 5. - Ст.56227. - ISSN 1063-651X, DOI 10.1103/PhysRevE.64.056227
Примечания : Cited References: 30
Предметные рубрики: QUANTUM CHAOTIC SCATTERING
MICROWAVE CAVITY
RESONANCE POLES
QUANTIZATION
STATISTICS
DYNAMICS
FORMULA
SYSTEMS
STATES
Аннотация: We derive an explicit expression for the coupling constants of individual eigenstates of a closed billiard that is opened by attaching a waveguide. The Wigner time delay and the resonance positions resulting from the coupling constants are compared to an exact numerical calculation. Deviations can be attributed to evanescent modes in the waveguide and to the finite number of eigenstates taken into account. The influence of the shape of the billiard and of the boundary conditions at the mouth of the waveguide are also discussed. Finally we show that the mean value of the dimensionless coupling constants tends to the critical value when the eigenstates of the billiard follow random-matrix theory.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Persson E., Pichugin K., Rotter I., Seba P.
Заглавие : Interfering resonances in a quantum billiard
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 1998. - Vol. 58, Is. 6. - P8001-8004. - ISSN 1063-651X, DOI 10.1103/PhysRevE.58.8001
Примечания : Cited References: 14
Предметные рубрики: MATRIX
POLES
Аннотация: We present a method for numerically obtaining the positions, widths, and wave functions of resonance states in a two-dimensional billiard connected to a waveguide. For a rectangular billiard, we study the dynamics of three resonance poles lying separated from the other ones. As a function of increasing coupling strength between the waveguide and the billiard two of the states become trapped while the width of the third one continues to increase for all coupling strengths. This behavior of the resonance poles is reflected in the time delay function, which can be studied experimentally. [S1063-651X(98)14112-0].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanov A. V., Presnyakov V. V., Zyryanov V. Y., Vetrov S. Y.
Заглавие : Characteristics of the process of reorientation of bipolar drops of a nematic with rigidly fixed poles
Место публикации : JETP Letters. - 1998. - Vol. 67, Is. 9. - P.733-737. - ISSN 0021-3640, DOI 10.1134/1.567739
Примечания : Cited References: 9
Аннотация: The director configuration in a bipolar drop of a nematic with rigidly fixed poles is calculated as a function of the electric field directed perpendicular to the symmetry axis of the drop. It is shown that the reorientation of the drop is a dual process: a threshold process in the region where the initial director orientation is orthogonal to the electric field, and a nonthreshold process elsewhere in the drop. A relation for determining the critical field is obtained. Experimental investigations of the characteristics of scattered light for a film of polymer-encapsulated liquid crystals confirm the computational results. (C) 1998 American Institute of Physics. [S0021-3640(98)01709-5].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Director configurations in nematic droplets with tilted surface anchoring
Коллективы : Russian Foundation for Basic Research (RFBR) [15-02-06924, 16-32-00164]; Siberian Branch of the Russian Academy of Sciences (SB RAS) [II.2P 0358-2015-0010]; RFBR [16-32-60036]
Место публикации : Liq. Cryst.: Taylor & Francis, 2017. - Vol. 44, Is. 2. - P.355-363. - ISSN 0267-8292, DOI 10.1080/02678292.2016.1205225. - ISSN 1366-5855(eISSN)
Примечания : Cited References:32. - This work was supported by Russian Foundation for Basic Research (RFBR) under Grants 15-02-06924 and 16-32-00164 and Siberian Branch of the Russian Academy of Sciences (SB RAS) under Complex Program [II.2P 0358-2015-0010], and V.S.S. acknowledges financial support from RFBR [16-32-60036].
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
RIGIDLY FIXED POLES
ELECTRIC-FIELD
POLYMER
Ключевые слова (''Своб.индексиров.''): polymer dispersed liquid crystal--nematic droplet--director--configuration--boundary conditions--surface anchoring strength--optical--texture
Аннотация: The polymer dispersed nematic liquid crystal (LC) with the tilted surface anchoring has been studied. The droplet orientational structures with two point surface defects – boojums and the surface ring defect – are formed within the films. The director tilt angle α = 40° ± 4° at the droplet interface and LC surface anchoring strength Ws ~ 10–6 (J m−2) have been estimated. The bipolar axes within the studied droplets of oblate ellipsoidal form can be randomly oriented are oriented randomly relatively to the ellipsoid axes as opposed to the droplets with homeotropic and tangential anchoring.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudyak V. Yu., Krakhalev M. N., Sutormin V. S., Prishchepa O. O., Zyryanov V. Ya., Liu J. H., Emelyanenko A. V., Khokhlov A. R.
Заглавие : Electrically induced structure transition in nematic liquid crystal droplets with conical boundary conditions
Коллективы : Russian Science Foundation [16-43-03010]; Ministry of Science and Technology of Taiwan [MOST 105-2923-E-006-007]
Место публикации : Phys. Rev. E. - 2017. - Vol. 96, Is. 5. - Ст.052701. - ISSN 2470-0045, DOI 10.1103/PhysRevE.96.052701. - ISSN 2470-0053(eISSN)
Примечания : Cited References:36. - This study was supported by the joint project of the Russian Science Foundation (Project No. 16-43-03010) and Ministry of Science and Technology of Taiwan (Contract No. MOST 105-2923-E-006-007). The simulations have been performed using the facilities of the Lomonosov Moscow State University Research Computational Center [37].
Предметные рубрики: RIGIDLY FIXED POLES
FRIEDERICKSZ THRESHOLD
ISOTROPIC LIQUID
FIELD
Аннотация: Polymer-dispersed liquid crystal composites have been a focus of study for a long time for their unique electro-optical properties and manufacturing by "bottom-up" techniques at large scales. In this paper, nematic liquid crystal oblate droplets with conical boundary conditions (CBCs) under the action of electric field were studied by computer simulations and polarized optical microscopy. Droplets with CBCs were shown to prefer an axial-bipolar structure, which combines a pair of boojums and circular disclinations on a surface. In contrast to droplets with degenerate planar boundary conditions (PBCs), hybridization of the two structure types in droplets with CBCs leads to a two-minima energy profile, resulting in an abrupt structure transition and bistable behavior of the system. The nature of the low-energy barrier in droplets with CBCs makes it highly sensitive to external stimuli, such as electric or magnetic fields, temperature, and light. In particular, the value of the electric field of the structure reorientation in droplets with CBCs was found to be a few times smaller than the one for droplets with PBCs, and the droplet state remained stable after switching off the voltage.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Belyaev B. A., Khodenkov S. A.
Заглавие : 8-order filter based on 2-D photonic crystal with dual-mode microstrip resonators
Коллективы : International Scientific Conference Reshetnev Readings
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2017. - Vol. 255, Is. 1. - Ст.012020. - , DOI 10.1088/1757-899X/255/1/012020
Примечания : Cited References: 5. - The authors would like to acknowledge the Zhejiang Boen Company and MAPEI Company for providing gratuitously, respectively, the steel fibers and micro silica fume. The first author would also like to acknowledge the grant obtained under the scope of the Erasmus Mundus - Marhaba project. The third author wishes to acknowledge the grant SFRH/BSAB/114302/2016 provided by FCT.
Ключевые слова (''Своб.индексиров.''): bandpass filters--crystal filters--microwave filters--photonic crystals--poles--resonators
Аннотация: The design of 8-order band-pass filter based on 2-D photonic crystal is suggested. Strip conductors in all dual-mode resonators are in the form of irregular rectangular frame with a gap and are connected at certain points with the ground. At optimal placement of such resonators on a substrate attenuation pole is observed on the amplitude-frequency characteristic of the filter, near low and high bandwidth slope that significantly improves its frequency-selective properties. The change of gap between input and output resonators allows to control the frequency of these poles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Лексиков, Александр Александрович, Tyurnev V. V., Serzhantov A. M.
Заглавие : Miniature suspended-substrate bandpass filter
Место публикации : Prog. Electromagn. Res. C. - 2010. - Vol. 15. - С. 219-231. - ISSN 19378718 (ISSN), DOI 10.2528/PIERC10070604
Ключевые слова (''Своб.индексиров.''): attenuation poles--narrow band filter--optimization method--pass-band edge--resonator filters--strip conductors--stripline structures--microwave filters--resonators--strip telecommunication lines--bandpass filters
Аннотация: A new quasi-lumped suspended-substrate stripline structure admitting implementation of miniature highly selective narrowband filters is studied. Appreciable improvement of the device selectivity is achieved with supplementary strip conductors introduced between the resonators, which induce attenuation poles near both passband edges. Furthermore, these supplementary conductors reducing the coupling between the resonators allow diminishing the interresonator spacing and the total size. A four-resonator filter is synthesized using the intelligence optimization method. Experimental results of the manufactured filter are presented.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Presnyakov V. V., Zyryanov V. Ya., Shabanov V. F., Vetrov S. Ya.
Заглавие : Friedericksz threshold field in bipolar droplets with rigidly fixed poles
Коллективы : International Liquid Crystal Conference
Место публикации : 17th International Liquid Crystal Conference (ILCC 1998): program and abstract book. - 1998. - P.253
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sivkov N. I., Shishkov A. G., Pynko V. G.
Заглавие : On application of powder patterns method for definition of wall poles in thin films
Коллективы : Академия наук СССР, Научный совет по комплексной проблеме "Физика твердого тела" АН СССР, Институт физики им. Л.В. Киренского Сибирского отделения РАН, Иркутский государственный педагогический институт, International colloquium on physics of magnetic films, Международный коллоквиум по физике магнитных пленок
Место публикации : International colloquium on physics of magnetic films: [program and abstracts]/ chairman L. V. Kirensky ; vice-chaiman: V. A. Buravikhin, R. V. Telesnin ; progr. and publ. com. N. M. Salansky ; progr. com.: V. A. Ignatchenko, Yu. V. Zakharov [et al]. - Irkutsk, 1968. - General session Domain structure. - Ст.3.8. - P.45 (Шифр В37/H99-248389966)
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