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    Wyświetlanie 1-27 z 27
    Tytuł:
    Approximations by Graphs and Emergence of Global Structures
    Autorzy:
    Exner, P.
    Hejčík, P.
    Šeba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044581.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    Opis:
    We study approximations of billiard systems by lattice graphs. It is demonstrated that under natural assumptions the graph wave functions approximate solutions of the Schrödinger equation with energy rescaled by the billiard dimension. As an example, we analyze a Sinai billiard with attached leads. The results illustrate emergence of global structures in large quantum graphs and offer interesting comparisons with patterns observed in complex networks of a different nature.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 23-31
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relativistic Scattering States of the Hellmann Potential
    Autorzy:
    Yazarloo, B.
    Mehraban, H.
    Hassanabadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398666.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    03.65.Pm
    Opis:
    In this letter, the scattering state solutions of the Dirac equation for spin and pseudospin symmetries are obtained for the Hellmann potential. The normalized wave functions and scattering phase shifts are calculated for both spin and pseudospin symmetries. Scattering properties for Coulomb-like and Yukawa-like potentials are also studied as limiting cases.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 684-688
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Semi-Relativistic Scattering States of the Hulthén and Hyperbolic-Type Potentials
    Autorzy:
    Hassanabadi, H.
    Yazarloo, B.
    Hassanabadi, S.
    Zarrinkamar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399494.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Pm
    03.65.Nk
    Opis:
    In this paper, the scattering states of the spinless-Salpeter equation are investigated for Hulthén and hyperbolic-type potentials for any arbitrary l-state. Approximate analytical formulae of the wave functions and the scattering phase shifts are reported.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 20-22
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Relativistic Transmission and Reflection Coefficients for Woods-Saxon Potential
    Autorzy:
    Yazarloo, B.
    Mehraban, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398910.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    03.65.Ge
    03.65.Pm
    Opis:
    The relativistic problem of spin-1/2 particles subject to the Woods-Saxon potential is investigated by using the functional analysis method. We obtain scattering and bound state solutions of the one-dimensional Dirac equation with the Woods-Saxon potential in terms of the Jacobi polynomials. We also calculated the transmission and reflection coefficients by using behavior of the wave functions at infinity.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1089-1092
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Studies of One-Dimensional and Three-Dimensional Chaotic Open Systems
    Autorzy:
    Ławniczak, M.
    Hul, O.
    Bauch, Sz.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585119.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    We present the results of experimental studies of microwave irregular networks and a three-dimensional microwave rough cavity in the presence of absorption. Microwave networks are also analyzed numerically. Microwave networks simulate one-dimensional quantum graphs. The networks consist of coaxial cables connected by joints and attenuators to control absorption. Three-dimensional microwave rough cavities have no formal analog in quantum 3D systems. However, some statistical properties of their spectra such as the level spacing distribution confirms that they belong to the wave-chaotic systems. Absorption of the cavity was changed by using a foam microwave absorber.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 749-755
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Persistent Currents and Bethe Ansatz
    Autorzy:
    Kiršanskas, G.
    Matulis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505510.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    03.65.Nk
    Opis:
    The system of two electrons interacting with a single impurity in 1D metallic ring is considered illustrating the applicability of the Bethe Ansatz.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 158-160
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Reflection Coefficient and Wigners Reaction Matrix for Microwave Graphs
    Autorzy:
    Hul, O.
    Bauch, S.
    Ławniczak, M.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047825.pdf
    Data publikacji:
    2007-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    We present the results of experimental study of the distribution P(R) of the reflection coefficient R and the distributions of Wigner's reaction K matrix for irregular, tetrahedral microwave graphs (networks) in the presence of absorption. Our experimental results are in good agreement with the exact theoretical predictions of Savin et al.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 4; 655-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering Properties of Chaotic Microwave Billiards
    Autorzy:
    Stöckmann, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585125.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    05.45.Mt
    Opis:
    Reflection and transmission measurements in microwave billiards with attached antennas allow the determination of all components of the scattering matrix including their phases. This is an extraordinary situation, since in usual scattering experiments in nuclear or atomic physics only reduced information such as the scattering cross-section can be obtained where the phase information is completely lost. This allows experimental tests of theoretical predictions of scattering theory inaccessible by any other method. As an example the distribution of reflection coefficients and of the line widths in a chaotic microwave billiard are discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 783-789
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Experimental Studies of the Elastic Enhancement Factor for 2D Open Systems
    Autorzy:
    Ławniczak, M.
    Białous, M.
    Yunko, V.
    Bauch, S.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400561.pdf
    Data publikacji:
    2015-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    We present the results of numerical and experimental studies of the elastic enhancement factor W for microwave rough and rectangular cavities simulating two-dimensional chaotic and partially chaotic quantum billiards in the presence of moderate absorption. We show that for the frequency range ν=15.0-18.5 GHz, in which the coupling between antennas and the system is strong enough, the values of W for the microwave rough cavity lie below the predictions of random matrix theory and on average above the theoretical results of V. Sokolov and O. Zhirov, Phys. Rev. E 91, 052917 (2015). We also show that for the partially chaotic rectangular billiard the enhancement factor W calculated by applying the Potter-Rosenzweig model with κ=2.8±0.5 is close to the experimental one.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 6; 974-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isoscattering Microwave Networks - The Role of the Boundary Conditions
    Autorzy:
    Ławniczak, M.
    Bauch, S.
    Sawicki, A.
    Kuś, M.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399050.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    05.45.Ac
    Opis:
    The recent paper by Hul et al. (Phys. Rev. Lett. 109, 040402 (2012)}, see Ref. [7]) addresses an important mathematical problem whether scattering properties of wave systems are uniquely connected to their shapes? The analysis of the isoscattering microwave networks presented in this paper indicates a negative answer to this question. In this paper the sensitivity of the spectral properties of the networks to boundary conditions is tested. We show that the choice of the proper boundary conditions is extremely important in the construction of the isoscattering networks.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1078-1081
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Determination of the Autocorrelation Function of Level Velocities for Microwave Networks Simulating Quantum Graphs
    Autorzy:
    Ławniczak, M.
    Borkowska, A.
    Hul, O.
    Bauch, S.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492514.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    The autocorrelation function c(x) of level velocities is studied experimentally. The measurements were performed for microwave networks simulating quantum graphs. One and two ports measurements of the scattering matrix Ŝ necessary for determining c(x) were realized for the networks possessing 5 and 6 vertices, respectively. The network with six vertices was fully connected. In the case of the networks with five vertices, additionally to the fully connected configuration, we measured the networks without the bond connecting input/output vertices. The obtained experimental results besides the autocorrelation function of level velocities, also the nearest-neighbor spacing distribution and parametric velocities distribution are compared to the predictions of random matrix theory and numerical results.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-185-A-190
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymptotics of Resonances Induced by Point Interactions
    Autorzy:
    Lipovský, J.
    Lotoreichik, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030012.pdf
    Data publikacji:
    2017-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Ge
    03.65.Nk
    02.10.Ox
    Opis:
    We consider the resonances of the self-adjoint three-dimensional Schrödinger operator with point interactions of constant strength supported on the set X={xₙ}_{n=1}^{N}. The size of X is defined by V_{X} = max_{π ∈ Π_{N}} ∑_{n=1}^{N} |xₙ - x_{π(n)}|, where Π_{N} is the family of all the permutations of the set {1,2,...,N}. We prove that the number of resonances counted with multiplicities and lying inside the disc of radius R behaves asymptotically linear W_{X}/πR + O(1) as R → ∞, where the constant W_{X} ∈ [0,V_{X}] can be seen as the effective size of X. Moreover, we show that there exist a configuration of any number of points such that W_{X}=V_{X}. Finally, we construct an example for N=4 with W_{X} < V_{X}, which can be viewed as an analogue of a quantum graph with non-Weyl asymptotics of resonances.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 6; 1677-1682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudo-Orbit Expansion for the Resonance Condition on Quantum Graphs and the Resonance Asymptotics
    Autorzy:
    Lipovský, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189973.pdf
    Data publikacji:
    2015-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Ge
    03.65.Nk
    02.10.Ox
    Opis:
    In this note we explain the method how to find the resonance condition on quantum graphs, which is called pseudo-orbit expansion. In three examples with standard coupling we show in detail how to obtain the resonance condition. We focus on non-Weyl graphs, i.e. the graphs which have fewer resonances than expected. For these graphs we explain benefits of the method of "deleting edges" for simplifying the graph.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 6; 968-973
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Wavefunctions and Energy Eigenvalues of the Schrodinger Equation for Different Potentials Due to the Virial Theorem
    Autorzy:
    Arslan, H.
    Hulaguhanoglu, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194111.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    03.65.Sq
    03.65.-w
    83.10.Ff
    Opis:
    The derivation of the virial theorem is presented both in classical and quantum mechanical approach. The kinetic energy and potential energy of the mechanical energy is converted to each other due to the virial theorem. Some of the different potentials are considered. For some of these potentials, the wavefunctions and energy eigenvalues of the Schrödinger Equation are derived.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 914-916
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaotic Scattering: Exact Results and Microwave Experiments
    Autorzy:
    Guhr, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190089.pdf
    Data publikacji:
    2015-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    24.60.Dr
    Opis:
    Scattering experiments are indispensable for the study of classical and quantum systems. In the Heidelberg approach, universal features are addressed by assuming that the reaction zone is fully quantum chaotic. Although it stems from nuclear physics, it later on turned out to be applicable to a large variety of systems on different scales, including classical wave systems. For a long time, the distribution of the off-diagonal scattering-matrix elements resisted analytical treatment. I review two recent studies in which my collaborators and I fully solved this problem. We also carried out a comparison with data from microwave experiments.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 6; 963-967
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Inverse Problem for Quantum Graphs with One Cycle
    Autorzy:
    Kurasov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585121.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    73.63.-b
    85.35.-p
    Opis:
    Quantum graphs having one cycle are considered. It is shown that if the cycle contains at least three vertices, then the potential on the graph can be uniquely reconstructed from the corresponding Titchmarsh-Weyl function (Dirichlet-to-Neumann map) associated with graph's boundary, provided certain non-resonant conditions are satisfied.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 765-771
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probing Eigenfunction Nonorthogonality by Parametric Shifts of Resonance Widths
    Autorzy:
    Savin, D.
    De Vaulx, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399049.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    05.45.Mt
    05.60.Gg
    Opis:
    Recently, it has been shown that the change of resonance widths in an open system under a perturbation of its interior is a sensitive indicator of the nonorthogonality of resonance states. We apply this measure to quantify parametric motion of the resonances. In particular, a strong redistribution of the widths is linked with the maximal degree of nonorthogonality. Then for weakly open chaotic systems we discuss the effect of spectral rigidity on the statistical properties of the parametric width shifts, and derive the distribution of the latter in a picket-fence model with equidistant spectrum.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1074-1077
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fidelity in Quasi-1D Systems as a Probe for Anderson Localization
    Autorzy:
    Bodyfelt, J.
    Zheng, M.
    Kottos, T.
    Kuhl, U.
    Stöckmann, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585120.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Dd
    72.15.Rn
    03.65.Nk
    03.65.Yz
    Opis:
    We analyze the echo dynamics in quasi-one-dimensional random media to investigate how the transition from localization to delocalization is encoded in its temporal decay properties. Our analysis extends from the standard perturbative regime corresponding to small perturbations (with respect to the mean level spacing) in the echo dynamics, out to the Wigner decay regime. On the theoretical side, our results rely on a banded random matrix modeling, and show in the localized regime under small perturbations a novel decay of the fidelity (Loschmidt echo), differing from the typical Gaussian decay seen within both diffusive and chaotic systems. For larger perturbation strengths, typical Wigner exponential decays are observed. Scattering echo measurements are performed experimentally within a quasi-1D microwave cavity randomly populated with point-like scatterers. Agreements are observed between experiments, numerics, and theoretical predictions.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 756-764
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Elastic Collision of Two H-Like Atoms Including the Exotic Ps and Mu
    Autorzy:
    Ray, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030031.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    03.65.Nk
    34.50.Cx
    Opis:
    Elastic collision between two H-like atoms using the ab initio static-exchange model (SEM) and a modified static-exchange model (MSEM) at cold energies are investigated in the center of mass frame considering the system as a four-body Coulomb problem where all the Coulomb interaction terms in the direct and exchange channels are treated exactly. The importance of an exact calculation to find basic physics is highlighted. In addition, the dependence of scattering length on the van der Waals interaction between the atoms and the dependence of scattering length on reduced-mass of the system are derived which is completely new information in the field of science.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1473-1477
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Spectral Gap for Laplacians on Metric Graphs
    Autorzy:
    Kurasov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399045.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    73.63.-b
    85.35.-p
    Opis:
    We discuss lower and upper estimates for the spectral gap of the Laplace operator on a finite compact connected metric graph. It is shown that the best lower estimate is given by the spectral gap for the interval with the same total length as the original graph. An explicit upper estimate is given by generalizing Cheeger's approach developed originally for Riemannian manifolds.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1060-1062
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse Problems for Quantum Graphs: Recent Developments and Perspectives
    Autorzy:
    Kurasov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492443.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    73.63.-b
    85.35.-p
    Opis:
    An introduction into the area of inverse problems for the Schrödinger operators on metric graphs is given. The case of metric finite trees is treated in detail with the focus on matching conditions. For graphs with loops we show that for almost all matching conditions the potential on the loop is not determined uniquely by the Titchmarsh-Weyl function. The class of all admissible potentials is characterized.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-132-A-141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Scattering of Neutron in the Magnetic Field οf 180° Bloch Wall
    Autorzy:
    Sazonov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538632.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    03.75.Be
    75.60.Ch
    02.30.Gp
    Opis:
    The exact solution of the Pauli equation has been derived for neutron wave propagating in magnetized continuum containing the magnetization non-uniformity such as the 180° Bloch wall, whose structure corresponds to the Landau-Lifshitz model. The scattering coefficients with and without neutron spin flip are presented as functions of ratio of neutron energy to the media's magnetic induction value. The possibility of narrow (≲100 Å) domain wall width measurement is discussed by the example of $YFe_{11}Ti$ alloy.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 449-453
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluctuations and Correlations in Scattering on a Resonance Coupled to a Chaotic Background
    Autorzy:
    Savin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030015.pdf
    Data publikacji:
    2017-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    05.60.Gg
    24.60.-k
    Opis:
    We discuss and briefly overview recent progress with studying fluctuations in scattering on a resonance state coupled to the background of many chaotic states. Such a problem arises naturally, e.g., when dealing with wave propagation in the presence of a complex environment. Using a statistical model based on random matrix theory, we obtain a number of nonperturbative results for various statistics of scattering characteristics. This includes the joint and marginal distributions of the reflection and transmission intensities and phases, which are derived exactly at arbitrary coupling to the background with finite absorption. The intensities and phases are found to exhibit highly non-trivial statistical correlations, which remain essential even in the limit of strong absorption. In the latter case, we also consider the relevant approximations and their accuracy. As an application, we briefly discuss the statistics of the phase rigidity (or mode complexness) in such a scattering situation.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 6; 1688-1694
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Localization in Left-Handed Media
    Autorzy:
    Rusek, M.
    Orłowski, A.
    Mostowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047827.pdf
    Data publikacji:
    2007-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    41.20.Jb
    72.10.Fk
    72.15.Rn
    Opis:
    Localized waves in disordered left-handed materials are studied using a generalized coupled-dipole model. Resonances in an open system consisting of randomly distributed electric and magnetic dipoles are investigated. A new type of long-lived resonance modes localized at the boundary of the system is found. They resemble evanescent waves responsible for a superfocusing phenomenon by a left-handed lens.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 4; 673-680
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering of Elastic Waves in a Quasi-One-Dimensional Cavity: Theory and Experiment
    Autorzy:
    Báez, G.
    Cobián-Suárez, M.
    Martínez-Argüello, A.
    Martínez-Mares, M.
    Méndez-Sánchez, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399047.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.40.Cd
    62.30.+d
    03.65.Nk
    73.21.Fg
    Opis:
    We study the scattering of torsional waves through a quasi-one-dimensional cavity both from the experimental and theoretical points of view. The experiment consists of an elastic rod with square cross-section. In order to form a cavity, a notch at a certain distance of one end of the rod was grooved. To absorb the waves, at the other side of the rod, a wedge, covered by an absorbing foam, was machined. In the theoretical description, the scattering matrix S of the torsional waves was obtained. The distribution of S is given by Poisson's kernel. The theoretical predictions show an excellent agreement with the experimental results. This experiment corresponds, in quantum mechanics, to the scattering by a delta potential, in one dimension, located at a certain distance from an impenetrable wall.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1069-1073
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation Functions of Impedance and Scattering Matrix Elements in Chaotic Absorbing Cavities
    Autorzy:
    Savin, D. V.
    Fyodorov, Y. V.
    Sommers, H.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044586.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    24.60.-k
    42.25.Bs
    03.65.Nk
    Opis:
    Wave scattering in chaotic systems with a uniform energy loss (absorption) is considered. Within the random matrix approach we calculate exactly the energy correlation functions of different matrix elements of impedance or scattering matrices for systems with preserved or broken time-reversal symmetry. The obtained results are valid at any number of arbitrary open scattering channels and arbitrary absorption. Elastic enhancement factors (defined through the ratio of the corresponding variance in reflection to that in transmission) are also discussed.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 53-64
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aspects of the Scattering and Impedance Properties of Chaotic Microwave Cavities
    Autorzy:
    Hemmady, S.
    Zheng, X.
    Antonsen, T.
    Ott, E.
    Anlage, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044605.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    11.55.-m
    03.50.De
    84.40.-x
    84.40.Az
    Opis:
    We consider the statistics of the impedance Z of a chaotic microwave cavity coupled to a single port. We remove the non-universal effects of the coupling from the experimental Z data using the radiation impedance obtained directly from the experiments. We thus obtain the normalized impedance whose probability density function is predicted to be universal in that it depends only on the loss (quality factor) of the cavity. We find that impedance fluctuations decrease with increasing loss. The results apply to scattering measurements on any wave chaotic system.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 65-71
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-27 z 27

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