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    Wyświetlanie 1-9 z 9
    Tytuł:
    Spontaneous Currents in a Bosonic Ring
    Autorzy:
    Makieła, D.
    Maśka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398603.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Lm
    03.75.Kk
    64.60.Ht
    Opis:
    Nonequilibrium dynamics of non-interacting bosons in a one-dimensional ring-shaped lattice is studied by means of the kinetic Monte Carlo method. The system is approximated by the classical XY model (the kinetic term is neglected) and then the simulations are performed for the planar classical spins. We study the dynamics that follows a finite-time quench to zero temperature. If the quench is slow enough the system can equilibrate and finally reaches the ground state with uniform spin alignment. However, we show that if the quench is faster than the relaxation rate, the system can get locked in a current-carrying metastable state characterized by a nonzero winding number. We analyze how the zero-temperature state depends on the quench rate.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 569-572
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extracting Information from Non Adiabatic Dynamics: Excited Symmetric States of the Bose-Hubbard Model
    Autorzy:
    Łącki, M.
    Delande, D.
    Zakrzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492502.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    67.85.Hj
    03.75.Kk
    03.75.Lm
    Opis:
    Using Fourier transform on a time series generated by unitary evolution, we extract many-body eigenstates of the Bose-Hubbard model corresponding to low energy excitations, which are generated when the insulator-superfluid phase transition is realised in a typical experiment. The analysis is conducted in a symmetric external potential both without and with a disorder. A simple classification of excitations in the absence disorder is provided. The evolution is performed assuming the presence of the parity symmetry in the system rendering many-body quantum states either symmetric or antisymmetric. Using symmetry-breaking technique, those states are decomposed into elementary one-particle processes.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-178-A-184
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluctuations between the BCS and BEC Limits in the System of Ultracold Alkali Atoms
    Autorzy:
    Domański, T.
    Donabidowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046728.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Mn
    03.75.Kk
    03.75.Ss
    Opis:
    We investigate the fluctuations induced by time-dependent interchange between the Bardeen-Cooper-Schrieffer and Bose-Einstein condensation regimes in the ultracold gas of fermion atoms. Such crossover can be triggered by varying the external magnetic field across the Feshbach resonance. Experimental realization is usually done via very fast switching which leads to the nonequilibrium effects. In this paper we focus on the ground state properties. In particular, we analyze time dependence of the wave function and consider fluctuations of the order parameters.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 471-476
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bright Solitons in Asymmetrically Trapped Bose-Einstein Condensates
    Autorzy:
    Golam Ali, Sk.
    Talukdar, B.
    Roy, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047288.pdf
    Data publikacji:
    2007-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.-b
    03.75.Kk
    05.30.Jp
    Opis:
    We study the dynamics of bright solitons in a Bose-Einstein condensate confined in a highly asymmetric trap. While working within the framework of a variational approach we carry out the stability analysis of the Bose-Einstein condensate solitons against collapse. When the number of atoms in the soliton exceeds a critical number N$\text{}_{c}$, it undergoes the so-called primary collapse. We find an analytical expression for N$\text{}_{c}$ in terms of appropriate experimental quantities that are used to produce and confine the condensate. We further demonstrate that, in the geometry of the problem considered, the width of the soliton varies inversely as the number of constituent atoms.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 3; 289-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Trapping and Propagation of Nonresonantly Driven One-Dimensional Exciton-Polariton Condensate
    Autorzy:
    Opala, A.
    Pieczarka, M.
    Sęk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033879.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    67.85.De
    71.36.+c
    03.75.Kk
    Opis:
    We study theoretically a nonresonant optical creation of a one-dimensional exciton-polariton condensate in a semiconductor microcavity. The polariton condensate is treated in the mean-field approach, taking into consideration an antitrapping potential created by the reservoir of noncondensed particles. Polariton condensates are excited by multiple lasers, with a combination of continuous wave and pulsed sources. The proposed pump-probe configuration leads to the realisation of various experimental schemes, e.g. optical trapping of a polariton condensate in real space. Moreover, it can be utilised for investigation of elementary excitations in the time domain when polariton condensates from two sources interact with each other.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 401-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultra-Cold Bosons in Optical Lattice: Time-of-Flight Imaging of Atom-Atom Correlations
    Autorzy:
    Zaleski, T.
    Kopeć, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431254.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Kk
    05.30.Jp
    67.85.Hj
    Opis:
    In the present paper, we investigate a system of strongly interacting bosons confined in two-dimensional optical lattice. We propose a combination of the Bogoliubov method with the quantum rotor approach and determine the spatial atom-atom correlations. This allows us to calculate time-of-flight absorption images, which exhibit all the characteristic features present in experimental results, namely transition from superfluid peaks to Mott insulating blob.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 796-800
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cold Atomic Gases in Optical Lattices with Disorder
    Autorzy:
    Schulte, T.
    Drenkelforth, S.
    Kruse, J.
    Ertmer, W.
    Arlt, J. J.
    Kantian, A.
    Sanchez-Palencia, L.
    Santos, L.
    Sanpera, A.
    Sacha, K.
    Zoller, P.
    Lewenstein, M.
    Zakrzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044614.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Kk
    03.75.Lm
    05.30.Jp
    64.60.Cn
    Opis:
    Cold atomic gases placed in optical lattices enable studies of simple condensed matter theory models with parameters that may be tuned relatively easily. When the optical potential is randomized (e.g. using laser speckle to create a random intensity distribution) one may be able to observe Anderson localization of matter waves for non-interacting bosons, the so-called Bose glass in the presence of interactions, as well as the Fermi glass or quantum spin glass for mixtures of fermions and bosons.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 89-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudogap and Other Precursor Signatures in the Systems with Local Fermion Pairs
    Autorzy:
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038382.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Mn
    71.10.Li
    03.75.Kk
    Opis:
    We consider precursor effects of the superconducting order which possibly show up in the normal state of high temperature superconducting materials. The local pairs of electrons or holes are formed there well above the transition temperature T$\text{}_{c}$. Due to strong quantum fluctuations the single particle density of states can be partly depleted near the Fermi energy leading to the pseudogap. We claim that this feature should go hand in hand with emergence of the Bogoliubov-type quasiparticles. In the normal state they are expected to be damped and acquire the long lifetime upon passing T$\text{}_{c}$. These Bogoliubov-type quasiparticles may nevertheless become correlated on a finite spatial and temporal scale. We discuss how such short-range pair correlations can be detected experimentally.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 553-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of the Hydrodynamic Properties of Bose-Einstein Condensate of $\text{}^{87}Rb$ Atoms in a Magnetic Trap
    Autorzy:
    Bylicki, F.
    Zawada, M.
    Gawlik, W.
    Noga, A.
    Zachorowski, J.
    Jastrzębski, W.
    Szczepkowski, J.
    Witkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813495.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Hh
    03.75.Kk
    67.85.Bc
    67.85.De
    Opis:
    We report details of the apparatus and the experimental procedure leading to production of the Bose-Einstein condensate of $\text{}^{87}Rb$ atoms. Basic hydrodynamic properties of the condensate, like quadrupole oscillations and free fall expansion, are investigated. They provide also characteristics of the magnetic trap crucial for interpretation of future experiments.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 691-705
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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