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

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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) : Kolovsky A. R.
Заглавие : Bogoliubov depletion of the fragmented condensate in the bosonic flux ladder
Место публикации : Phys. Rev. A: American Physical Society, 2017. - Vol. 95, Is. 3. - Ст.033622. - ISSN 10502947 (ISSN), DOI 10.1103/PhysRevA.95.033622
Примечания : Cited References: 31. - The author acknowledges discussions with A. Eckardt, the hospitality of MPIPKS in Dresden, and financial support from Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746.
Ключевые слова (''Своб.индексиров.''): bosons--crystal lattices--ladders--optical lattices--bogoliubov--dispersion relations--interacting bosons--ultracold atoms--ground state
Аннотация: We theoretically analyze the ground state of weakly interacting bosons in the flux ladder - the system that has been recently realized by means of ultracold atoms in the specially designed optical lattice [M. Atala, M. Aidelsburger, M. Lohse, J. T. Barreiro, B. Paredes, and I. Bloch, Nat. Phys. 10, 588 (2014)1745-247310.1038/nphys2998]. It is argued that, for the system parameters corresponding to two degenerate minima in the Bloch dispersion relation, the ground state is a fragmented condensate. We study the Bogoliubov depletion of this condensate and discuss the role of boundary conditions. © 2017 American Physical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R., Maksimov D. N.
Заглавие : Mott-insulator state of cold atoms in tilted optical lattices: Doublon dynamics and multilevel Landau-Zener tunneling
Место публикации : Phys. Rev. A: American Physical Society, 2016. - Vol. 94, Is. 4. - Ст.043630. - ISSN 10502947 (ISSN), DOI 10.1103/PhysRevA.94.043630
Примечания : Cited References: 34
Ключевые слова (''Своб.индексиров.''): crystal lattices--optical materials--analytical expressions--cold atoms--doublons--dynamical response--in-laboratory experiments--landau zener tunneling--mott insulator state--optical lattices
Аннотация: We discuss the dynamical response of strongly interacting Bose atoms in an adiabatically tilted optical lattice. The analysis is performed in terms of the multilevel Landau-Zener tunneling. Different regimes of tunneling are identified and analytical expressions for the doublon number, which is the quantity measured in laboratory experiments, are derived. © 2016 American Physical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beloshapkin V. V., Zaslavsky G. M., Tretyakov A. G.
Заглавие : Effect of the interaction of distant atoms on the structural states of an atomic chain
Место публикации : Fiz. Nizk. Temp. - 1984. - Vol. 10, Is. 11. - P.1197-1205. - ISSN 0132-6414
Примечания : Cited References: 11
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Wave-packet dynamics of cold atoms in 2D lattices subject to synthetic magnetic and electric fields
Коллективы : International symposium and school for young scientist "Modern problems of laser physics", Международный симпозиум и школа для молодых ученых "Современные проблемы лазерной физики", Институт лазерной физики Сибирского отделения РАН, Новосибирский государственный университет, Институт спектроскопии РАН, Московский государственный университет им. М.В. Ломоносова, Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений
Место публикации : Modern problems of laser physics: матер. симп. - Новосибирск: ЗАО ИПП "Офсет", 2016. - P.258 (Шифр 26519667)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : One- and two-dimensional Raman-induced diffraction gratings in atomic media
Место публикации : Phys. Rev. A. - 2018. - Vol. 98, Is. 1. - Ст.013838. - ISSN 2469-9926, DOI 10.1103/PhysRevA.98.013838. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 37
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
COLD ATOMS
ABSORPTION
Аннотация: We propose and analyze an efficient scheme for the one- and two-dimensional atomic gratings based on periodic spatial modulation of the Raman gain and dispersion, which we name the Raman-induced diffraction gratings (RIDGs). There are fundamentally different from those based on electromagnetically induced transparency. As the probe field propagates along the direction normal to the standing pump wave, it can be effectively diffracted into high-order directions. The grating is a hybrid grating, i.e. it represents a mixture of amplitude and phase gratings. We identify the conditions when all high-order diffractions are amplified. In addition, we also show that diffraction of a probe field could be dynamically controlled using an additional laser field. With its help, it is possible to suppress or amplify diffraction beams. The RIDGs can be considered as all-optical multibeam splitters with amplification.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Wannier-Stark states and topological phase transitions in tilted two-dimensional bipartite lattices
Коллективы : Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg, Vilnius University, Lithuanian Physical Society
Место публикации : Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids: conference materials. - 2018
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bychek A. A., Maksimov D. N., Kolovsky A. R.
Заглавие : NOON state of Bose atoms in the double-well potential via an excited-state quantum phase transition
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
Место публикации : Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст.063624. - ISSN 2469-9926, DOI 10.1103/PhysRevA.97.063624. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 60. - The authors acknowledge financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746.
Предметные рубрики: EINSTEIN CONDENSATE
SUPERPOSITION STATES
NOBEL LECTURE
ENTANGLEMENT
Аннотация: We suggest a simple scheme for creating a NOON state of repulsively interacting Bose atoms in the double-well potential. The protocol consists of two steps. First, by setting atom-atom interactions to zero, the system is driven to the upper excited state. Second, the interactions are slowly increased and, simultaneously, the interwell tunneling is decreased to zero. We analyze fidelity of the final state to the NOON state depending on the number of atoms, ramp rate, and fluctuations of the system parameters. It is shown that for a given fidelity the ramp rate scales algebraically with the number of atoms.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drozdova A. K., Cherepanov V. N., Svetlichny V. A., Kveglis L. I., Volochaev M. N., Velikanov D. A.
Заглавие : Structure and magnetic properties of titanium nickelide nanoparticles synthesized by pulsed laser ablation method
Коллективы : International Conference on Films and Coatings
Место публикации : J. Phys. Conf. Ser.: IOP, 2017. - Vol. 857, Is. 1. - Ст.012007. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/857/1/012007
Примечания : Cited References: 9
Ключевые слова (''Своб.индексиров.''): ablation--coatings--high resolution transmission electron microscopy--laser ablation--nanomagnetics--nanoparticles--synthesis (chemical)--titanium--transmission electron microscopy--equiatomic composition--magnetization values--ti atoms--titanium nickelide--pulsed lasers
Аннотация: We have successfully synthesized magnetic titanium nickelide nanoparticles with equiatomic composition by pulsed laser ablation method. Using transmission electron microscopy and microanalysis was revealed that particles represent the homogeneous conglomerates containing identical amount of Ni and Ti atoms. The magnetization value of nanoparticles was estimated.
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10.

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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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V.
Заглавие : Magnetooptical activity of allowed electron transitions in atoms in free state and in crystals
Место публикации : Phys. Status Solidi B. - 1990. - Vol. 159, Is. 2. - P.883-892. - ISSN 0370-1972, DOI 10.1002/pssb.2221590236
Примечания : Cited References: 15
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Di Valentin C., Neyman K. M., Risse T., Sterrer M., Fischbach E., Freund H. J., Nasluzov V. A., Pacchioni G., Rosch N.
Заглавие : Density-functional model cluster studies of EPR g tensors of F-s(+) centers on the surface of MgO
Разночтения заглавия :авие SCOPUS: Density-functional model cluster studies of EPR g tensors of F s + centers on the surface of MgO
Место публикации : J. Chem. Phys.: AMER INST PHYSICS, 2006. - Vol. 124, Is. 4. - Ст.44708. - ISSN 0021-9606, DOI 10.1063/1.2161190
Примечания : Cited References: 37
Предметные рубрики: ELECTRONIC G-TENSORS
CORRELATION-ENERGY
MGO(001) SURFACE
OXYGEN VACANCIES
SPIN-ORBIT
G-VALUES
ATOMS
APPROXIMATION
COMPLEXES
MOLECULES
Ключевые слова (''Своб.индексиров.''): density-functional model cluster--single-crystalline thin films--spin-orbit interaction--anisotropy--paramagnetic resonance--single crystals--tensors--thin films--magnesium compounds
Аннотация: We report g tensors of surface color centers, so-called F-s(+) centers, of MgO calculated with two density-functional approaches using accurately embedded cluster models. In line with recent UHV measurements on single-crystalline MgO film, we determined only small g-tensor anisotropies and negative shifts Delta g equivalent to g-g(e) for all F-s(+) sites considered, namely, (001)-terrace, step, edge, and corner sites. The g values are very sensitive to the local structure of the defect: relaxation reverses the sign of Delta g. However, accounting for the spin-orbit interaction either self-consistently or perturbatively yields very similar results. In addition to the values of the tensor components, their direction with respect to the surface was determined. In contrast to edges, significant deviations from ideal C-2v symmetry were found for F-s(+) centers at steps. Recent data on single-crystalline thin films are reevaluated in the light of these results. (c) 2006 American Institute of Physics.
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14.

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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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Persistent current of atoms in a ring optical lattice
Место публикации : New J. Phys.: IOP PUBLISHING LTD, 2006. - Vol. 8. - Ст.197. - ISSN 1367-2630, DOI 10.1088/1367-2630/8/9/197
Примечания : Cited References: 22
Предметные рубрики: SUPERFLUIDITY
Ключевые слова (''Своб.индексиров.''): fluid dynamics--random processes--spectrum analysis--high energy spectra--quasimomentum--random matrix theory--high energy physics
Аннотация: We consider a small ensemble of Bose atoms in a ring optical lattice with weak disorder. The atoms are assumed to be initially prepared in a superfluid state with nonzero quasimomentum and, hence, may carry matter current. It is found that the atomic current persists in time for a low value of the quasimomentum but decays exponentially for a high (around one quarter of the Brillouin zone) quasimomentum. The explanation is given in terms of low- and high-energy spectra of the Bose-Hubbard model, which we describe using the Bogoliubov and random matrix theories, respectively.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov A. K., Myslivets S. A., Gao J. Y., Zhang H. Z., Wellegehausen B.
Заглавие : Inversionless gain in a three-level system driven by a strong field and collisions
Место публикации : Chin. Phys. - 2000. - Vol. 9, Is. 2. - P.124-130. - ISSN 1009-1963
Примечания : Cited References: 45
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
POPULATION-INVERSION
LIGHT AMPLIFICATION
QUANTUM COHERENCE
REFRACTIVE-INDEX
LASER
INTERFERENCE
TRANSITIONS
SODIUM
ATOMS
Аннотация: Inversionless gain in a degenerate three-level system driven by a strong external field and by collisions with a buffer gas is investigated. The mechanism of population distribution in upper laser level, contributed by the collision transfer, as well as by relaxation, induced by pressure of a buffer gas, is discussed in detail. Explicit formulae for analysis of optimal conditions are derived. The idea developed here for the incoherent pump could be generalized to other systems.
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17.

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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Donkov A., Eremin I., Knolle J., Korshunov M. M.
Заглавие : Electron-Phonon Interaction and Phonon Renormalization in the Lamellar Cobaltate NaxCoO2
Разночтения заглавия :авие SCOPUS: Electron-phonon interaction and phonon renormalization in the lamellar cobaltate Na x CoO 2
Место публикации : J. Supercond. Nov. Magn.: SPRINGER, 2009. - Vol. 22: International Conference on Quantum Phenomena in Complex Matters (JUL 26-AUG 01, 2008, Erice, ITALY), Is. 1. - P37-40. - ISSN 1557-1939, DOI 10.1007/s10948-008-0372-6
Примечания : Cited References: 16
Предметные рубрики: SUPERCONDUCTIVITY
Ключевые слова (''Своб.индексиров.''): electron-phonon interaction--superconductivity--sodium cobaltate--electron-phonon interaction--sodium cobaltate--superconductivity--brillouin zones--cobaltate--conducting electrons--conduction electrons--doping dependences--feedback effects--matrix elements--phonon frequencies--phonon modes--raman experiments--renormalization--sodium cobaltate--sodium cobaltates--atoms--cobalt compounds--critical current density (superconductivity)--electric conductivity--electron-phonon interactions--electrons--flow interactions--penetration depth (superconductivity)--sodium--superconductivity--phonons
Аннотация: We study theoretically the electron-phonon interaction in NaxCoO2. For the A(1g) and E-1g phonon modes found in Raman experiments, we calculate the matrix elements of the electron-phonon interaction. Analyzing the feedback effect of the conduction electrons on the phonon frequency., we investigate the doping dependence of these two phonon modes. Due to the momentum dependence of the electron-phonon interaction, we find the strongest renormalization of the E-1g mode around the Brillouin zone boundary which should be observed in the neutron scattering. At the same time, the A(1g) mode shows the strongest coupling to the conducting electrons around the G point and reveals its doping dependence in the Raman experiments. Our results shed light on the possible importance of the electron-phonon interaction in the lamellar sodium cobaltates.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KAZANTSEV A. P., KRASNOV I. V.
Заглавие : DEEP POTENTIAL WELLS AND ROTATION OF ATOMS IN A LIGHT-FIELD
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 1988. - Vol. 127, Is. 1. - P33-36. - ISSN 0375-9601, DOI 10.1016/0375-9601(88)90960-7
Примечания : Cited References: 15
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavriliuk A. P., Isaev I. L., Karpov S. V., Krasnov I. V., Shaparev N. Y.
Заглавие : Brownian dynamic of laser cooling and crystallization of electron-ion plasma
Место публикации : Phys. Rev. E. - 2009. - Vol. 80, Is. 5. - Ст.56404. - ISSN 1539-3755, DOI 10.1103/PhysRevE.80.056404
Примечания : Cited References: 29
Предметные рубрики: ULTRACOLD NEUTRAL PLASMAS
OPTICAL MOLASSES
LIQUIDS
ATOMS
TRAP
Ключевые слова (''Своб.индексиров.''): brownian motion--laser cooling--plasma collision processes--plasma light propagation--plasma nonlinear processes--plasma simulation--plasma transport processes--brownian dynamics--brownian dynamics simulations--electron ion plasma--electron subsystem--friction force--ionic structure--nonlinear dependence--plasma cooling--brownian movement--crystallization--ions--laser cooling--lasers--cooling
Аннотация: Laser cooling and crystallization of electron-ion plasma is studied using the Brownian dynamics simulation technique and taking into consideration the interaction of ions with the electron subsystem. It has been shown that the nonlinear dependence of laser friction force on the velocity of ions has to be taken into account in order to simulate in an adequate manner the cooling dynamics and obtain a correct estimate for minimum temperatures. It has been found that times required for formation of an ordered ionic structure can be much longer than the typical plasma cooling time.
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