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Общее количество найденных документов : 116
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1.


    Kolovsky, A. R.
    Topological phase transitions in tilted optical lattices / A. R. Kolovsky // Phys. Rev. A. - 2018. - Vol. 98, Is. 1. - Ст. 013603, DOI 10.1103/PhysRevA.98.013603. - Cited References: 17 . - ISSN 2469-9926. - ISSN 2469-9934
РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
BLOCH OSCILLATIONS
   REALIZATION

   BANDS

   MODEL

Аннотация: We analyze the energy spectrum and eigenstates of cold atoms in a tilted brick-wall optical lattice. When the tilt is applied, the system exhibits a sequence of topological phase transitions reflected in an abrupt change of the eigenstates. It is demonstrated that these topological phase transitions can be easily detected in a laboratory experiment by observing Bloch oscillations of cold atoms.

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Держатели документа:
RAS, VL Kirensky Inst Phys SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Коловский, Андрей Радиевич
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2.


    Kolovsky, A. R.
    Landauer-Buttiker equation for bosonic carriers / A. R. Kolovsky, Z. Denis, S. Wimberger // Phys. Rev. A. - 2018. - Vol. 98, Is. 4. - Ст. 043623, DOI 10.1103/PhysRevA.98.043623. - Cited References: 37 . - ISSN 2469-9926. - ISSN 2469-9934
РУБ Optics + Physics, Atomic, Molecular & Chemical

Аннотация: We study the current of Bose particles between two reservoirs connected by a one-dimensional channel. We analyze the problem from first principles by considering a microscopic model of conductivity in the noninteracting limit. Equations for the transient and the stationary current are derived analytically. The asymptotic current has a form similar to the Landauer-Buttiker equation for electronic current in mesoscopic devices.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Paris Diderot, Sorbonne Paris Cite, F-75013 Paris, France.
Univ Parma, Dipartimento Sci Matemat Fis & Informat, Campus Univ,Parco Area Sci 7-A, I-43124 Parma, Italy.
INFN, Sez Milano Bicocca, Grp Collegato Parma, I-43124 Parma, Italy.

Доп.точки доступа:
Denis, Zakari; Wimberger, Sandro; Коловский, Андрей Радиевич
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3.


    Коловский, Андрей Радиевич.
    Генетический код Андрея Коловского / А. Р. Коловский // Новая университетская жизнь : газета Сибирского Федерального университета. - 2017. - 20 апреля, № 6. - С. 8-9

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Кириченко, Вера \сост.\; Kolovsky, A. R.; \о нем\
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4.


    Kolovsky, A. R.
    Microscopic models of source and sink for atomtronics / A. R. Kolovsky // Phys. Rev. A. - 2017. - Vol. 96, Is. 1. - Ст. 011601, DOI 10.1103/PhysRevA.96.011601. - 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. . - ISSN 2469-9926. - ISSN 2469-9934
РУБ Optics + Physics, Atomic, Molecular & Chemical
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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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Коловский, Андрей Радиевич; Russian Foundation; Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
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5.


    Kolovsky, A. R.
    Topological flat Wannier-Stark bands / A. R. Kolovsky, A. Ramachandran, S. Flach // Phys. Rev. B. - 2018. - Vol. 97, Is. 4. - Ст. 045120, DOI 10.1103/PhysRevB.97.045120. - Cited References: 32 . - ISSN 2469-9950
Аннотация: We analyze the spectrum and eigenstates of a quantum particle in a bipartite two-dimensional tight-binding dice network. In the absence of a dc bias, it hosts a chiral flatband with compact localized eigenstates. In the presence of a dc bias, the energy spectrum consists of a periodic repetition of one-dimensional energy band multiplets, with one member in the multiplet being strictly flat. The corresponding flatband eigenstates cease to be compact, and are localized exponentially perpendicular to the dc field direction, and superexponentially along the dc field direction. The band multiplets are characterized by a topological quantized winding number (Zak phase), which changes at specific values of the varied dc field strength. These changes are induced by gap closings between the flat and dispersive bands, and reflect the number of these closings.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
IBS Center for Theoretical Physics of Complex Systems, Daejeon, South Korea

Доп.точки доступа:
Ramachandran, A.; Flach, S.; Коловский, Андрей Радиевич
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6.


    Bychek, A. A.
    NOON state of Bose atoms in the double-well potential via an excited-state quantum phase transition / A. A. Bychek, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст. 063624, DOI 10.1103/PhysRevA.97.063624. - 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. . - ISSN 2469-9926. - ISSN 2469-9934
РУБ Optics + Physics, Atomic, Molecular & Chemical
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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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Бычек, Анна Андреевна; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
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7.


    Kolovsky, A. R.
    Wannier-Stark states and topological phase transitions in tilted two-dimensional bipartite lattices / A. R. Kolovsky // Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids : conference materials. - 2018

Материалы конференции,
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Доп.точки доступа:
Коловский, Андрей Радиевич; Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg(2018 ; July 29 - August 2 ; Vilnius, Lithuania)Vilnius University; Lithuanian Physical Society
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8.


    Бычек, Анна Андреевна.
    Спектральные и динамические характеристики холодных Бозе атомов в оптическом потенциале нескольких ям / А. А. Бычек, А. Р. Коловский // XXII конф. мол. ученых ФИЦ КНЦ СО РАН : сборник тезисов. - Красноярск, 2019. - С. 13. - Библиогр.: 3

Материалы конференции
Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Коловский, Андрей Радиевич; Kolovsky, A. R.; Bychek, A. A.; Конференция молодых ученых ФИЦ КНЦ СО РАН(22 ; 2019 ; апр. ; 18 ; Красноярск)
}
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9.


    Bychek, A. A.
    Probing quantum chaos in many-body quantum systems by the induced dissipation / A. A. Bychek, P. S. Muraev, A. R. Kolovsky // Phys. Rev. A. - 2019. - Vol. 100, Is. 1. - Ст. 013610, DOI 10.1103/PhysRevA.100.013610. - Cited References: 29. - This work has been supported through Russian Science Foundation Grant N19-12-00167. The authors are grateful to D. N. Maksimov for stimulating discussions. . - ISSN 2469-9926. - ISSN 2469-9934
   Перевод заглавия: Исследование квантового хаоса в многочастичных квантовых системах при помощи диссипации
РУБ Optics + Physics, Atomic, Molecular & Chemical

Аннотация: We theoretically analyze the depletion dynamics of an ensemble of cold atoms in a quasi-one-dimensional optical lattice where atoms in one of the lattice sites are subject to decay. Unlike the previous studies of this problem in Labouvie et al., Phys. Rev. Lett. 116, 235302 (2016), we focus on the case where the system is brought to the chaotic regime, which crucially modifies the depletion dynamics as compared to the regular case. It is shown that depletion of the affected site results in gradual depletion of the neighboring sites according to the t1/3 scaling law. We also show that by measuring occupations of the lattice sites one can extract important information on chaotic dynamics of the original conservative system.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Muraev, Pavel S.; Kolovsky, A. R.; Коловский, Андрей Радиевич; Бычек, Анна Андреевна; Russian Science Foundation [N19-12-00167]
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10.


    Kolovsky, A. R.
    Evaporative Cooling and Self-Thermalization in an Open System of Interacting Fermions / A. R. Kolovsky, D. L. Shepelyansky // Ann. Phys.-Berlin. - 2019. - Vol. 531, Is. 12. - Ст. 1900231, DOI 10.1002/andp.201900231. - Cited References: 24. - For D.L.S. this work was supported in part by the Programme Investissements d'Avenir ANR-11-IDEX-0002-02, reference ANR-10-LABX-0037-NEXT (project THETRACOM). For A.R.K. this work was supported in part by Russian Science Foundation through the grant N19-12-00167. . - ISSN 0003-3804. - ISSN 1521-3889
   Перевод заглавия: Испарительное охлаждение и само-термализация в открытой системе взаимодействующих фермионов
Рубрики:
QUANTUM CHAOS
   DISTRIBUTIONS

   STATISTICS

Кл.слова (ненормированные):
open quantum systems -- quantum chaos -- self-thermalization
Аннотация: Depletion dynamics of an open system of weakly interacting fermions with two-body random interactions is studied. In this model, fermions are escaping from the high-energy one-particle orbitals, that mimics the evaporation process used in laboratory experiments with neutral atoms to cool them to ultra-low temperatures. It is shown that due to self-thermalization the system instantaneously adjusts to the new temperature which decreases with the course of time.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Toulouse, UPS, Lab Phys Theor, IRSAMC,CNRS, F-31062 Toulouse, France

Доп.точки доступа:
Shepelyansky, Dima L.; Коловский, Андрей Радиевич; Programme Investissements d'AvenirFrench National Research Agency (ANR) [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]; Russian Science FoundationRussian Science Foundation (RSF) [N19-12-00167]
}
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