Zobrazeno 1 - 10 of 124 pro vyhledávání: '"N. A. Bogolyubov"'
3
Quasiaverages and Degenerate Quantum Equilibriums of Magnetic Systems with SU(3) Symmetry of the Exchange Interaction
Autor: A. V. Glushchenko, N. N. Bogolyubov, M. Yu. Kovalevskii
Publikováno v: Theoretical and Mathematical Physics. 195:704-717
We consider magnetic systems with the SU(3) symmetry of the exchange interaction. For degenerate equilibriums with broken magnetic and phase symmetries, we formulate classification equations for the order parameter using the concept of residual symme
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7ff2fe3a35dad724b3f7508203ae467c
https://doi.org/10.1134/s0040577918050069
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4
Algebraic Aspects of the Dynamics of Quantum Multilevel Systems in the Projection Operator Technique
Autor: N. N. Bogolyubov, A. V. Soldatov
Publikováno v: Theoretical and Mathematical Physics. 194:220-235
Using the projection operator method, we obtain approximate time-local and time-nonlocal master equations for the reduced statistical operator of a multilevel quantum system with a finite number N of quantum eigenstates coupled simultaneously to arbi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e01defc576bc3a806d2f3a181791629
https://doi.org/10.1134/s0040577918020034
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5
Low-frequency fluorescence spectrum of a laser driven polar quantum emitter damped by squeezed vacuum with finite bandwidth
Autor: N N Bogolyubov, A V Soldatov
Publikováno v: Journal of Physics: Conference Series. 2056:012001
A two-level quantum emitter with broken inversion symmetry driven by external semiclassical monochromatic high-frequency electromagnetic (e.g., laser) field and damped by squeezed vacuum reservoir with finite bandwidth is presented. The squeezed vacu
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c214bdebcf0affd8d56a38d569bbae6d
https://doi.org/10.1088/1742-6596/2056/1/012001
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6
On improvable bounds for polaron systems in an external potential
Autor: N. N. Bogolyubov, A. V. Soldatov
Publikováno v: Moscow University Physics Bulletin. 71:356-362
A variational approach is proposed that allows one to obtain in a regular way a sequence of improvable upper bounds for the ground-state energy of various polaron models confined in an external electrostatic potential. The proposed approach can be us
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ce2d4ce16e69993f530c73f76c2eb6ba
https://doi.org/10.3103/s0027134916040020
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7
Electromagnetic radiation amplification by means of a driven two-level system damped by broadband squeezed vacuum reservoir
Autor: A. V. Soldatov, N. N. Bogolyubov
Publikováno v: Journal of Physics: Conference Series. 1560:012001
It is shown that a two-level quantum system with broken inversion symmetry possessing dipole moment operator with permanent non-equal diagonal matrix elements, driven by external semiclassical monochromatic high-frequency electromagnetic (laser) fiel
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ee1a807e2528fc44b3037064ef80f9c1
https://doi.org/10.1088/1742-6596/1560/1/012001
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9
Calculating the spectral characteristics of a waveguide with homogeneous bi-isotopic filling by using the finite element method
Autor: Yu. V. Mukhartova, N. A. Bogolyubov
Publikováno v: Mathematical Models and Computer Simulations. 7:323-330
In the present paper, a numerical algorithm is proposed for calculating propagation constants for the vector spectral problem in a rectangular waveguide with perfectly conducting walls and a homogeneous bi-isotropic filling. This algorithm rests on t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a510a54d350c642e2a21c7e31102e510
https://doi.org/10.1134/s2070048215040079
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10
Synthesis of layered waveguiding systems based on metamaterials
Autor: M. I. Svetkin, Yu. V. Muhartova, N. A. Bogolyubov, I. A. Butkarev
Publikováno v: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS).
An efficient algorithm for wide range of problems of waveguiding systems synthesis based on metamaterials is constructed. The algorithm is based on the use of the new formulation of the boundary value problem, in which not leads to nonphysical soluti
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6ff7a4899c1262e6dc6ef9d79a337a51
https://doi.org/10.1109/piers.2017.8262101
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