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    Wyświetlanie 1-6 z 6
    Tytuł:
    Manifold Approach for a Many-Body Wannier-Stark System: Localization and Chaos in Energy Space
    Autorzy:
    Parra-Murillo, C.
    Wimberger, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399053.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    05.45.Mt
    Opis:
    We study the resonant tunneling effect in a many-body Wannier-Stark system, realized by ultracold bosonic atoms in an optical lattice subjected to an external Stark force. The properties of the many-body system are effectively described in terms of upper-band excitation manifolds, which allow for the study of the transition between regular and quantum chaotic spectral statistics. We show that our system makes it possible to control the spectral statistics locally in energy space by the competition of the force and the interparticle interaction. By a time-dependent sweep of the Stark force the dynamics is reduced to a Landau-Zener problem in the single-particle setting.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1091-1097
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resonant Tunneling Controlled by Laser and Constant Electric Fields
    Autorzy:
    Kamiński, J.
    Saczuk, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419694.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    72.20.Dp
    73.40.Gk
    Opis:
    We develop the concept of scattering matrix and we use it to perform stable numerical calculations of resonant tunneling of electrons through a multiple potential barrier in a semiconductor heterostructure. Electrons move in two external nonperturbative electric fields: constant and oscillating in time. We apply our algorithm for different strengths and spatial configurations of the fields.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 53-62
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Delay in Thin Slabs with Kerr-Type Nonlinearity
    Autorzy:
    Radovanović, J.
    Milanović, V.
    Isić, G.
    Ikonić, Z.
    Indjin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047864.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Bs
    42.65.Hw
    42.6.Tg
    03.65.Xp
    Opis:
    In this paper we analyzed the following model: a thin slab with Kerr nonlinearity placed between two semi-infinite samples of linear and nonmagnetic materials. A general relation between the bidirectional group delay and the dwell time is derived for the thin slab. It is shown that the group delay is equal to the dwell time plus a self-interference delay. Particular attention is given to solving the Helmholtz equation for this case. Detailed and rigorous treatment revealed that the solutions of the Helmholtz equation are given via elliptic functions of the first kind. The boundary conditions at the interfaces are determined precisely. Finally, we provide an overall procedure for numerical calculation of the dwell times.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 987-992
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Goos-Hänchen Shift on Tunneling Times in Dispersive Nonlinear Media
    Autorzy:
    Ilić, I.
    Beličev, P.
    Milanović, V.
    Radovanović, J.
    Hadžievski, Lj.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795625.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    42.25.Bs
    42.65.Hw
    78.20.Ci
    Opis:
    The Goos-Hänchen effect is an optical phenomenon defined as a displacement of the reflected beam of linearly polarized light after the total internal reflection, which occurs perpendicularly to the direction of propagation. Due to this effect, when an optical wave propagates through a barrier, tunneling times may change accordingly. In this paper, we consider the impact of the Goos-Hänchen effect on group delay and dwell time for electromagnetic wave propagating through a nonlinear dispersive slab placed inside linear dispersive surroundings. Numerical calculations are performed for the special case, namely a double negative index metamaterial embedded into a material with a saturable nonlinearity, when a background medium is vacuum. The numerical results for tunneling times are calculated when the Goos-Hänchen effect is observed. It is shown that this approach gives more accurate expressions for tunneling times when the angle of incidence has a non-zero value.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 638-641
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity
    Autorzy:
    Beličev, P.
    Ilić, I.
    Radovanović, J.
    Milanović, V.
    Hadžievski, Lj.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808066.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    41.20.Jb
    42.25.Bs
    42.70.Nq
    Opis:
    Time delays for an intense transverse electric wave propagating through a slab with saturable nonlinearity are investigated. The nonlinearity is assumed in a form of the Vinetskii-Kukhtarev model, which is relevant for the slabs made of nonlinear photorefractive crystals, such as GaAs and $LiNbO_3$, which feature a saturable nonlinearity. The expressions for the group delay and the dwell time are derived and the relation between them is studied. It is shown that the difference between them has three different contributions. The first one corresponds to the self-interference associated with the dispersion of the medium surrounding the slab. The other two appear due to the nonlinearity of the slab and oblique incidence of the transverse electric wave. All the results are compared with the case of dielectric slabs with cubic (Kerr) nonlinearity.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 834-837
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Group Delay in Semiconductor Structures with Energy Dependent Effective Mass
    Autorzy:
    Kočinac, S.
    Milanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047876.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    73.21.Fg
    73.40.Gk
    73.43.Jn
    Opis:
    We investigate tunneling times of a particle with energy dependent effective mass for a one-dimensional real potential. General relations between phase, group and dwell times are obtained for a desired potential shape. For the textbook case of a real rectangular potential barrier the explicit relations for relevant times are derived, which reveal that the nonparabolicity, depending on the energy of incident particle, may substantially increase the group time in realistic structures. Further, we extend this theory to the case of absorptive media described by complex potentials, via introduction of a new absorptive tunneling time τ$\text{}_{a}$. Depending on whether the short wavelength or long wavelength limit is considered, maximization of τ$\text{}_{a}$ results in a very different shape of a complex rectangular potential.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1037-1042
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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