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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Chistyakov N. S., Tuschkov B. P.
Заглавие : Constituents measurement of complex superhighfrequency susceptibility of magnetic 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. - Section Ferromagnetic resonance, spin-wave resonance, high-frequency properties. - Ст.6-A.1. - P.59 (Шифр В37/H99-248389966)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KHOLOPOVA G. D., BONDARENKO V. S., KUZMIN V. I., RUBAILO A. I.
Заглавие : HYDROGEN COMPLEX OF PENTAFLUOROBENZENE WITH DIMETHYLSULFOXIDE
Место публикации : Khimicheskaya Fiz.: MEZHDUNARODNAYA KNIGA, 1984. - Vol. 3, Is. 4. - P618-619. - ISSN 0207-401X
Примечания : Cited References: 6
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GAVRICHKOV V. A.
Заглавие : DISTORTION OF A COMPLEX DEFECT WITH A WEAK BINDING
Место публикации : Semiconductors: AMER INST PHYSICS, 1993. - Vol. 27, Is. 10. - P921-924. - ISSN 1063-7826
Примечания : Cited References: 6
Аннотация: A simple non-self-consistent approach is used in an analysis of the distortion of a complex defect characterized by a weak binding. The dependences of the magnitude of the distortion of a two-component defect on the position of its local population levels and on the number of carriers in a band are given.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Varganov S. A., Avramov P. V., Ovchinnikov S. G.
Заглавие : Ab initio calculations of endo- and exohedral C-60 fullerene complexes with Li+ ion and the endohedral C-60 fullerene complex with Li-2 dimer
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 2. - P388-392. - ISSN 1063-7834, DOI 10.1134/1.1131218
Примечания : Cited References: 16
Предметные рубрики: ELECTRONIC-STRUCTURE
ENERGIES
C60
Аннотация: The results of ab initio Hartree-Fock calculations of endo- and exohedral C-60 fullerene complexes with the Li+ ion and Li-2 dimer are presented. The coordination of the Li+ ion and the Li-2 dimer in the endohedral complexes and the coordination of Li+ ion in the exohedral complex of C-60 fullerene are determined by the geometry optimization using the 3-21G basis set. In the endohedral Li+C60 complex, the Li+ ion is displaced from the center of the C-60 cage to the centers of carbon hexa- and pentagons by 0.12 nm. In the Li-2 dimer encapsulated inside the C-60 cage, the distance between the lithium atoms is 0.02 nm longer than that in the free molecule. The calculated total and partial one-electron densities of states of C-60 fullerene are in good agreement with the experimental photoelectron and X-ray emission spectra. Analysis of one-electron density of states of the endohedral Li+@C-60 complex indicates an ionic bonding between the Li atoms and the C-60 fullerene. In the Li+C60 and Li+@C-60 complexes, there is a strong electrostatic interaction between the Li+ ion and the fullerene. (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boehm M., Roessli B., Schefer J., Wills A. S., Ouladdiaf B., Lelievre-Berna E., Staub U., Petrakovskii G. A.
Заглавие : Complex magnetic ground state of CuB2O4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2003. - Vol. 68, Is. 2. - Ст.24405. - ISSN 1098-0121, DOI 10.1103/PhysRevB.68.024405
Примечания : Cited References: 16
Предметные рубрики: COPPER METABORATE
SCATTERING
Аннотация: The magnetic ground-state of copper metaborate CuB2O4 was investigated with unpolarized and polarized neutron scattering. A phase transition was found at T-N = 21 K to a commensurate weakly ferromagnetic state followed by a second transition at T* = 10 K to an incommensurate magnetic structure. Neutron diffraction revealed a continuously changing magnetic propagation vector below T*, and unusually asymmetric magnetic satellite reflections. Additionally, diffuse scattering is observed in the temperature range 1.5 K less than or equal to Tless than or equal to 30 K. The magnetic structure determined in both phases are shown to be consistent with results of symmetry analysis. In particular, we find that only one of the two inequivalent Cu2+ sublattice fully orders down to the lowest temperature. Our results show that the complex magnetic behavior of copper metaborate is a consequence of mutual interaction between the two Cu2+ sublattices with different ordering temperatures.
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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) : Sadreev A. F., Berggren K. F.
Заглавие : Signatures of quantum chaos in complex wavefunctions describing open billiards
Место публикации : J. Phys. A. - 2005. - Vol. 38, Is. 49. - P.10787-10804. - ISSN 0305-4470, DOI 10.1088/0305-4470/38/49/019
Примечания : Cited References: 103
Предметные рубрики: TIME-REVERSAL SYMMETRY
RANDOM-MATRIX
STATISTICAL-THEORY
ENERGY-LEVELS
S-MATRIX
CHARACTERISTIC VECTORS
PHASE SINGULARITIES
INFINITE DIMENSIONS
BORDERED MATRICES
NUCLEAR REACTIONS
Аннотация: We discuss signatures of quantum chaos in open chaotic billiards. Solutions for such a system are given by complex scattering wavefunctions psi = u + iv when a steady current flows through the billiard. For slightly opened chaotic billiards the current distributions are simple and universal. It is remarkable that the resonant transmission through integrable billiards also gives the universal current distribution. Cur-rents induced by the Rashba spin-orbit interaction can flow even in closed billiards. Wavefunction and current distributions for a chaotic billiard with weak and strong spin-orbit interactions have been derived and compared with numerics. Similarities with classical waves are considered. In particular we propose that the networks of electric resonance RLC circuits may be used to study wave chaos. However, being different from quantum billiards, there is a resistance from the inductors which gives rise to heat power and decoherence.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rotter I., Sadreev A. F.
Заглавие : Avoided level crossings, diabolic points, and branch points in the complex plane in an open double quantum dot
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2005. - Vol. 71, Is. 3. - Ст.36227. - ISSN 1063-651X, DOI 10.1103/PhysRevE.71.036227
Примечания : Cited References: 49
Предметные рубрики: BERRY TOPOLOGICAL PHASE
EXCEPTIONAL POINTS
GEOMETRIC PHASES
NUCLEAR REACTIONS
RESONANCE STATES
UNIFIED THEORY
S-MATRIX
CONTINUUM
REPULSION
INTERFEROMETER
Ключевые слова (''Своб.индексиров.''): branch points in the complex plane (bpcp)--diabolic points (dp)--geometric phases--riemann sheets--eigenvalues and eigenfunctions--electron energy levels--functions--hamiltonians--quantum theory--resonance--topology--semiconductor quantum dots
Аннотация: We study the spectrum of an open double quantum dot as a function of different system parameters in order to receive information on the geometric phases of branch points in the complex plane (BPCP). We relate them to the geometrical phases of the diabolic points (DPs) of the corresponding closed system. The double dot consists of two single dots and a wire connecting them. The two dots and the wire are represented by only a single state each. The spectroscopic values follow from the eigenvalues and eigenfunctions of the Hamiltonian describing the double dot system. They are real when the system is closed, and complex when the system is opened by attaching leads to it. The discrete states as well as the narrow resonance states avoid crossing. The DPs are points within the avoided level crossing scenario of discrete states. At the BPCP, width bifurcation occurs. Here, different Riemann sheets evolve and the levels do not cross anymore. The BPCP are physically meaningful. The DPs are unfolded into two BPCP with different chirality when the system is opened. The geometric phase that arises by encircling the DP in the real plane, is different from the phase that appears by encircling the BPCP. This is found to be true even for a weakly opened system and the two BPCP into which the DP is unfolded.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasil'ev A. D., Molokeev M. S., Golovnev N.N., Churilov G. N.
Заглавие : Preparation and crystal structure of hydrated crystalline complex of ciprofloxacin and copper tetrachloride
Место публикации : J. Struct. Chem. - 2005. - Vol. 46, Is. 2. - P.363-370. - ISSN 0022-4766, DOI 10.1007/s10947-006-0055-8
Примечания : Cited Reference Count: 16
Аннотация: Synthesis of a complex formed by ciprofloxacin (cfH) and copper(II) chloride is described; its crystal structure is reported and analyzed in comparison to related compounds. The obtained compound (ctH(3))CuCl4 center dot H2O (cfH(3)(2+) - double protonated cfH molecule) crystallizes as platelets of P2(1)/c symmetry having the unit cell parameters a = 13.491 (1) angstrom, b = 11.0459(7) angstrom, c = 16.299(1) angstrom; beta = 1.392(7)degrees. Carbonyl oxygen O(1) is protonated, and hydrogen atom combined with it forms an intramolecular hydrogen bond with carboxylic O(2) oxygen (O(1) center dot center dot center dot O(2) = 2.642(5) angstrom). Terminal nitrogen atom N(3) of the piperazinyl group is also protonated, and two its hydrogen atoms participate in hydrogen bonds of N-H center dot center dot center dot Cl type. The structure also has hydrogen bonds O-H center dot center dot center dot O, O-H... Cl with the participation of water molecules which occupy hydrophilic channels. Molecular ions cfH(3)(2+), make couples with intrapair pi center dot center dot center dot pi interactions.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Rotter I., Sadreev A. F.
Заглавие : Phase rigidity and avoided level crossings in the complex energy plane
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2006. - Vol. 74, Is. 5. - Ст.56204. - ISSN 1539-3755, DOI 10.1103/PhysRevE.74.056204
Примечания : Cited References: 40
Предметные рубрики: OPEN QUANTUM-SYSTEMS
FANO RESONANCES
S-MATRIX
DOT
CONTINUUM
TRANSMISSION
COHERENCE
TRANSPORT
BILLIARDS
PROBE
Ключевые слова (''Своб.индексиров.''): eigenvalues and eigenfunctions--hamiltonians--resonance--rigidity--semiconductor quantum dots--biorthogonal eigenfunctions--open quantum system--phase rigidity--quantum theory
Аннотация: We consider the effective Hamiltonian of an open quantum system, its biorthogonal eigenfunctions phi(lambda), and define the value r(lambda)=(phi(lambda)parallel to phi(lambda))/phi(lambda)parallel to phi(lambda) that characterizes the phase rigidity of the eigenfunctions phi(lambda). In the scenario with avoided level crossings, r(lambda) varies between 1 and 0 due to the mutual influence of neighboring resonances. The variation of r(lambda) is an internal property of an open quantum system. In the literature, the phase rigidity rho of the scattering wave function Psi(E)(C) is considered. Since Psi(E)(C) can be represented in the interior of the system by the phi(lambda), the phase rigidity rho of the Psi(E)(C) is related to the r(lambda) and therefore also to the mutual influence of neighboring resonances. As a consequence, the reduction of the phase rigidity rho to values smaller than 1 should be considered, at least partly, as an internal property of an open quantum system in the overlapping regime. The relation to measurable values such as the transmission through a quantum dot, follows from the fact that the transmission is, in any case, resonant at energies that are determined by the real part of the eigenvalues of the effective Hamiltonian. We illustrate the relation between phase rigidity rho and transmission numerically for small open cavities.
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