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

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Vortex phase diagram of F=1 spinor Bose-Einstein condensates
Место публикации : Phys. Rev. Lett.: AMERICAN PHYSICAL SOC, 2003. - Vol. 90, Is. 20. - Ст.200401. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.90.200401
Примечания : Cited References: 15
Предметные рубрики: ATOMS
CREATION
GASES
Аннотация: We have calculated the F=1 ground state of a spinor Bose-Einstein condensate trapped harmonic potential with an applied Ioffe-Pitchard magnetic field. The vortex phase diagram is found in the plane spanned by perpendicular and longitudinal magnetic fields. The ferromagnetic condensate has two vortex phases which differ by winding number in the spinor components. The two vortices for the F-z=-1 antiferromagnetic condensate are separated in space. Moreover, we considered an average local spin \[(S) over right arrow]\ to testify to what extent it is parallel to magnetic field (the nonadiabatic effects). We have shown that the effects are important at vortex cores.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KRASNOV I. V.
Заглавие : STRAIGHTENING EFFECT OF RADIATION POWER AND LIGHT-INDUCED PHENOMENA OF TRANSFER IN RESONANCE GASES
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 107, Is. 4. - P1135-1152. - ISSN 0044-4510
Примечания : Cited References: 18
Предметные рубрики: FORCE
ATOMS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kudashkin K., Nikolaev S. V., Ovchinnikov S. G.
Заглавие : Spectral properties of the Bose-Hubbard model within the cluster perturbation theory in X-operators representation
Коллективы : RFBR [16-02-00098, 16-42-243048, 16-42-240511, 16-42-240769]; Government of Krasnoyarsk Territory; Russian President Grant [NSh-7559.2016.2]
Место публикации : J. Supercond. Nov. Magn.: Springer, 2017. - Vol. 30, Is. 1. - P.103-107. - ISSN 1557-1939, DOI 10.1007/s10948-016-3781-y. - ISSN 1557-1947(eISSN)
Примечания : Cited References:16. - This work was supported by RFBR grant 16-02-00098, Government of Krasnoyarsk Territory and RFBR according to the research projects 16-42-243048, 16-42-240511, and 16-42-240769, and the Russian President Grant NSh-7559.2016.2.
Предметные рубрики: TRANSITION
SUPERFLUID
INSULATOR
ATOMS
Ключевые слова (''Своб.индексиров.''): bose-hubbard model--ultracold gases--cluster perturbation theory--density of states--spectral properties
Аннотация: We study the two-dimensional ultracold Bose gas in optical lattice. We use cluster perturbation theory based on Hubbard X-operators to calculate the spectral function and phase diagram of Bose-Hubbard model which is minimal model to describe behavior of ultracold gases in optical lattices. We have analyzed spectral properties of spinless bosons in a square lattice taking into account the short-range correlation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slabko V. V., Khachatryan G. G., Aleksandrovsky A. S.
Заглавие : Self-organized aggregation of small metal particles controlled by an external light field
Место публикации : JETP Letters. - 2006. - Vol. 84, Is. 6. - P.300-304. - ISSN 0021-3640, DOI 10.1134/S0021364006180056
Примечания : Cited References: 16
Предметные рубрики: CLUSTERS
ATOMS
Аннотация: Using simplest two- and three-particle models, it is shown that there exists a possibility of controlled aggregation of silver nanoparticles in an external light field. The aggregation occurs as a result of the dipole-dipole interaction of particles, whose energy has a minimum at a certain particle configuration and at corresponding frequency and polarization of the field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Alekseev K. N., Alekseeva N. V., Perina J.
Заглавие : Quantum-classical correspondence and nonclassical state generation in dissipative quantum optical systems
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2000. - Vol. 90, Is. 4. - P592-599. - ISSN 1063-7761, DOI 10.1134/1.559142
Примечания : Cited References: 32
Предметные рубрики: 2ND-HARMONIC GENERATION
STATISTICAL PROPERTIES
HARMONIC-GENERATION
SQUEEZED STATES
CHAOS
LIGHT
NONLINEARITIES
INSTABILITIES
DYNAMICS
ATOMS
Аннотация: We develop a semiclassical method to determine the nonlinear dynamics of dissipative quantum optical systems in the limit of large number of photons N; it is based on the 1/N-expansion and the quantum-classical correspondence. The method is used to tackle two problems: the study of the dynamics of nonclassical state generation in higher order anharmonic dissipative oscillators and the establishment of the difference between the quantum and classical dynamics of the second-harmonic generation in a self-pulsing regime. In addressing the first problem, we obtain an explicit time dependence of the squeezing and the Fano factor for an arbitrary degree of anharmonism in the short-time approximation. For the second problem, we analytically find a characteristic time scale at which the quantum dynamics differs insignificantly from the classical one. (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Quantum phase transitions in two-dimensional tilted optical lattices
Место публикации : Phys Rev A: American Physical Society, 2016. - Vol. 93, Is. 3. - Ст.033626. - ISSN 10502947 (ISSN), DOI 10.1103/PhysRevA.93.033626
Примечания : Cited References: 19. - The author acknowledges fruitful discussions with M. Fleischhauer and F. Grusdt; the hospitality of the University of Kaiserslautern, where a part of this work was conducted; and financial support from Russian Foundation for Basic Research through Project No. 15-02-00463, Wannier-Stark states and Bloch oscillations of a quantum particle in a generic two-dimensional lattice.
Предметные рубрики: Atoms
Аннотация: We discuss the quantum phase transition between the Mott-insulator state and the density-wave state of cold Bose atoms in a two-dimensional (2D) square lattice as the lattice is adiabatically tilted along one of its primary axes. It is shown that a small misalignment of the tilt drastically changes the result of the adiabatic passage and, instead of the density-wave state, one obtains a disordered state. An intrinsic relation of the problem to Bloch oscillations of hard-core bosons in a 2D lattice is illuminated. © 2016 American Physical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R., Grusdt F., Fleischhauer M.
Заглавие : Quantum particle in a parabolic lattice in the presence of a gauge field
Коллективы : TU Kaiserslatern; [DFG/GSC 266]
Место публикации : Phys. Rev. A: American Physical Society, 2014. - Vol. 89, Is. 3. - Ст.33607. - ISSN 1050-2947, DOI 10.1103/PhysRevA.89.033607. - ISSN 1094-1622
Примечания : Cited References: 22. - A.K. acknowledge the hospitality and financial support of TU Kaiserslatern, where this work was completed. F.G. was supported by a fellowship through the Excellence Initiative (DFG/GSC 266).
Предметные рубрики: TOPOLOGICAL EDGE STATES
OPTICAL LATTICES
ATOMS
Аннотация: We analyze the eigenstates of a two-dimensional lattice with additional harmonic confinement in the presence of an artificial magnetic field. While the softness of the confinement makes a distinction between bulk and edge states difficult, the interplay of harmonic potential and lattice leads to a different classification of states in three energy regions: In the low-energy regime, where lattice effects are small, all states are transporting topologically nontrivial states. For large energies above a certain critical value, the periodic lattice causes localization of all states through a mechanism similar toWannier-Stark localization. In the intermediate energy regime transporting, topologically nontrivial states coexist with topologically trivial countertransporting chaotic states. The character of the eigenstates, in particular their transport properties, are studied numerically and are explained using a semiclassical analysis.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R., Buchleitner A.
Заглавие : Quantum chaos in the Bose-Hubbard model
Место публикации : Europhys. Lett. - 2004. - Vol. 68, Is. 5. - P.632-638. - ISSN 0295-5075, DOI 10.1209/epl/i2004-10265-7
Примечания : Cited References: 22
Предметные рубрики: EINSTEIN CONDENSATE
DOUBLE-WELL
TRANSITION
SUPERFLUID
INSULATOR
ATOMS
Аннотация: We present a numerical study of the spectral properties of the 1D Bose-Hubbard model. Unlike the 1D Hubbard model for fermions, this system is found to be non-integrable, and exhibits Wigner-Dyson spectral statistics under suitable conditions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Microscopic models of source and sink for atomtronics
Коллективы : Russian Foundation; Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
Место публикации : Phys. Rev. A: American Physical Society, 2017. - Vol. 96, Is. 1. - Ст.011601. - ISSN 2469-9926, DOI 10.1103/PhysRevA.96.011601. - ISSN 2469-9934(eISSN)
Примечания : Cited References:26. - The author acknowledges financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746.
Предметные рубрики: BOSE-HUBBARD MODEL
ANDERSON LOCALIZATION
BLOCH OSCILLATIONS
ATOMS
Аннотация: We analyzemicroscopic models of the particle source or sink which consist of a one- or two-site Bose-Hubbard model (the system) weakly coupled to amany-site Bose-Hubbard model (the reservoir). Assuming unequal filling factors for the system and reservoir, we numerically study equilibration dynamics and compare it with the solution of the master equation on the reduced density matrix of the system. Necessary conditions for the validity of the master equation approach are formulated.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Yakobson B. I., Scuseria G. E.
Заглавие : Mechanisms of inelastic scattering of low-energy protons by C6H6, C-60, C6F12, and C60F48 molecules
Разночтения заглавия :авие SCOPUS: Mechanisms of inelastic scattering of low-energy protons by C 6H6, C60, C6F12, and C60F48 molecules
Место публикации : Phys. Solid State: SPRINGER, 2006. - Vol. 48, Is. 1. - P177-184. - ISSN 1063-7834, DOI 10.1134/S106378340601032X
Примечания : Cited References: 23
Предметные рубрики: DYNAMICS SIMULATIONS
FULLERENES
COMPLEXES
BUCKMINSTERFULLERENE
HELIUM
ATOMS
Аннотация: The mechanisms of inelastic scattering of low-energy protons with a kinetic energy of 2-7 eV by C6H6, C6F12, C-60, and C60F48 molecules are studied using the methods of quantum chemistry and nonempirical molecular dynamics. It is shown that, for the C6H6 + proton and C-60 + proton systems, starting from a distance of 6 angstrom from the carbon skeleton, the electronic charge transfer from the aromatic molecule to H+ occurs with a probability close to unity and transforms the H+ ion into a hydrogen atom and the neutral C6H6 and C-60 molecules into cation radicals. The mechanism of interaction of low-energy protons with C6F12 and C60F48 molecules has a substantially different character and can be considered qualitatively as the interaction between a neutral molecule and a point charge. The Coulomb perturbation of the system arising from the interaction of the noncompensated proton charge with the Mulliken charges of fluorine atoms results in an inversion of the energies of the electronic states localized, on the one hand, on the positively charged hydrogen ion and, on the other hand, on the C6F12 and C60F48 molecules. As a result, the neutral molecule + proton state becomes the ground state. In turn, this inversion makes the electronic charge transfer energetically unfavorable. Quantum-chemical and molecular-dynamics calculations on different levels of theory showed that, for fluorine derivatives of some aromatic structures (C6F12, C60F48), the barriers to proton penetration through carbon hexagons are two to four times lower than for the corresponding parent systems (C6H6, C-60). This effect is explained by the absence of active pi-electrons in the case of fluorinated molecules.
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