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1
Content available Use of Bersons-Kulsh Form Factor of Short-Pulse Approximation in Rydberg-State Physics
100%
Parzyński R. , Sobczak M.
Acta Physica Polonica A
|
2003
|
tom 103
|
nr 1
13-23
EN
The experiments on high Rydberg states interacting with short electromagnetic pulses were hitherto mainly explained by using numerical integration of the time-dependent Schrödinger equation in a restricted state basis. In this study we apply a different approach based on the Bersons-Kulsh analytical form factor of the short-pulse approximation. This analytical approach is shown to well reproduce the recent experimental results and those of numerical integration of the time-dependent Schrödinger equation both in the case of terahertz half-cycle pulses and optical many-cycle pulses. This fact enables a recommendation of the analytical Bersons-Kulsh form factor as an alternative and efficient method of quantum calculations of electromagnetically induced Rydberg state redistribution.
2
Content available One-Dimensional versus Three-Dimensional Approaches to the Rydberg Wave Packet Dynamics
100%
Kopyciuk T. , Parzyński R.
Acta Physica Polonica A
|
2006
|
tom 110
|
nr 1
41-49
EN
We show that a one-dimensional approximation to a real three-dimensional atom offers good results for a selected group of the Rydberg states. It is demonstrated in the context of evolution of the Rydberg wave packets produced by the so-called half-cycle pulses.
3
Content available remote Effective Mass of Bound and Resonant Two-Electron Pairs in a Simple Cubic Lattice
100%
Bak M.
Acta Physica Polonica A
|
2015
|
tom 127
|
nr 2
290-292
EN
Effective masses m* of bound 2-electron pairs on a simple cubic lattice were investigated within tUWJ model within symmetry channels. Linear increase of m* with |W| for intersite pairs and nonlinear behavior and sign change of m* in case of pairs with on-site component were found. |m*| turned out to be larger than twice free electron mass.
4
Content available remote Simplified Solving Procedure for the One-Dimensional Schrodinger Equation with Asymmetrical Boundary Conditions
100%
Puszkarski H.
Acta Physica Polonica A
|
1999
|
tom 96
|
nr 3-4
327-331
EN
We propose a new simplified procedure for finding the analytical solutions of the stationary one-dimensional Schrodinger equation, with asymmetric boundary conditions imposed on the equation. The essence of the method consists in expressing the general solution explicitly in terms of the boundary parameters in a form which, by itself, satisfies one of the boundary conditions involved; then, the other boundary condition gives straightforwardly the characteristic equation. This method may turn out to be beneficial with regard to the recently growing interest in one-dimensional quantum systems.
5
Content available remote Dirac-Deng-Fan Problem with Coulomb-Hulthen Tensor Interactions
80%
Ikot A. , Hassanabadi H. , Yazarloo B. , Umo M. , Zarrinkamar S.
Acta Physica Polonica A
|
2014
|
tom 126
|
nr 3
656-662
EN
The relativistic symmetries of the Dirac equation within the framework of spin and pseudospin symmetries is investigated for Deng-Fan potential including the Coulomb-like and Hulthen-type potential tensor interaction terms. The energy eigenvalues and the corresponding wave function are obtained using the parametric generalization of Nikiforov-Uvarov method. We have also reported some numerical results and figures to show the effect of the tensor interactions.
6
Content available remote Exact Solution of Klein-Gordon with the Pöschl-Teller Double-Ring-Shaped Coulomb Potential
80%
Hassanabadi H. , Ikot A. , Zarrinkamar S.
Acta Physica Polonica A
|
2014
|
tom 126
|
nr 3
647-652
EN
Analytical solution of the Klein-Gordon equation under the equal scalar and vector Pöschl-Teller double-ring-shaped Coulomb potentials is obtained. We have used the Nikiforov-Uvarov method in our calculations. The radial wave function in terms of the Laguerre polynomials is presented and the angular wave functions are expressed in terms of the Jacobi polynomials. We have also considered some special cases of the Pöschl-Teller double-ring-shaped Coulomb potential and represented the energy eigenvalues and the corresponding wave functions.
7
Content available remote Bound States for Pseudoharmonic Potential of the Dirac Equation with Spin and Pseudo-Spin Symmetry via Laplace Transform Approach
80%
Biswas B. , Debnath S.
Acta Physica Polonica A
|
2016
|
tom 130
|
nr 3
692-696
EN
Bound state solutions of the Dirac equation for the pseudoharmonic potential with spin and pseudo-spin symmetry are studied in this paper. To obtain the exactly normalized bound state wave function and energy expressions we have used the Laplace transform approach.
8
Content available Adiabatic Processes in Quantum Optics
80%
Stenholm S.
Acta Physica Polonica A
|
2002
|
tom 101
|
nr 3
425-435
EN
This paper reviews the use of adiabatic approximations in quantum optics.The general principle is explained in terms of the Landau-Zener model and the recently developed stimulated Raman adiabatic passage scheme. The features characteristic of adiabatic evolution are extracted from these examples. Our recent work on adiabatic level preparation and cavity mode transfer of excitation is presented and discussed.
9
Content available remote Pseudo-Orbit Expansion for the Resonance Condition on Quantum Graphs and the Resonance Asymptotics
80%
Lipovský J.
Acta Physica Polonica A
|
2015
|
tom 128
|
nr 6
968-973
EN
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.
10
Content available remote The Puzzle of the 0.7 Anomaly in Conductance of Quantum Point Contact Reexamined
80%
Figielski T.
Acta Physica Polonica A
|
2013
|
tom 124
|
nr 5
841-842
EN
A novel approach to the solution of the long-standing problem, called 0.7 anomaly in quantum point contact, is proposed. It is based on fundamental principles of quantum mechanics and can explain all main properties of the anomaly.
11
Content available remote Engineering and Advanced Digitalization of Photonic Structures with Bound Field in the Continuum
80%
Prodanović N. , Milanović V. , Radovanović J.
Acta Physica Polonica A
|
2009
|
tom 116
|
nr 4
607-610
EN
We describe a method for generation of complex optical potentials which support a bound state of the electric field in continuous part of the spectrum. It is based on deep analogy between quantum mechanical and electromagnetic phenomena and relies on the application of supersymmetric quantum mechanics to generate a smoothly varying complex optical potential, together with the corresponding electric field function for the (single) localized state. However, the obtained potential profile is generally a strongly oscillating function which requires additional processing to make it suitable for practical realization. With this goal in mind, i.e. the construction of a realizable photonic crystal with complex permittivity which supports one bound state in continuum, we have developed an original scheme of digital grading. It approximates the values of the complex relative permittivity in such manner that the final structure may be realized by assembling layers of homogeneous materials.
12
Content available remote Complete Analytical Solutions of the Mie-Type Potentials in N-Dimensions
80%
Agboola D.
Acta Physica Polonica A
|
2011
|
tom 120
|
nr 3
371-377
EN
The exact solutions of the N-dimensional Schrödinger equation with the Mie-type potentials are obtained. The energy levels are worked out and the corresponding wave functions are obtained in terms of the Laguerre polynomial. Some energy levels of some diatomic molecules are given using the modified Kratzer-type potential. The expectation values 〈r^{-1}〉 and 〈r^{-2}〉 and the virial theorem are also obtained in N-dimensions using the Hellmann-Feynman theorem. The ladder operators are also constructed for the Mie-type potentials in N-dimensions and the matrix elements of some operators r and r·d/dr are analytically obtained from the ladder operators. The general results reduce to the 3-dimensional case when N = 3.
13
Content available remote Exact Solutions and Light Bullet Soliton Solutions of the Two-Dimensional Generalized Nonlinear Schrödinger Equation with Distributed Coefficients
80%
Huang W. , Mu C. , Xu Y. , Ding B.
Acta Physica Polonica A
|
2013
|
tom 124
|
nr 4
622-625
EN
A generalized G'/G-expansion method is extended to construct exact solutions to the two-dimensional generalized nonlinear Schrödinger equation with distributed coefficients. Hyperbolic function solution, trigonometric function solution and rational exact solution with parameters are obtained. Selecting parameters and parameter functions properly, novel light bullet soliton solutions with or without the chirp are presented.
14
Content available remote Commutative vs. Noncommutative Space Statistical Properties of Two-Dimensional Harmonic Oscillator in Magnetic Field
80%
Hassanabadi H. , Derakhshani Z. , Zarrinkamar S.
Acta Physica Polonica A
|
2016
|
tom 129
|
nr 1
3-7
EN
We consider the Schrödinger equation in presence of an external magnetic field in commutative and noncommutative spaces and by solving the equation in an exact analytical manner, report the statistical quantities of the system.
15
Content available remote Asymptotics of Resonances Induced by Point Interactions
80%
Lipovský J. , Lotoreichik V.
Acta Physica Polonica A
|
2017
|
tom 132
|
nr 6
1677-1682
EN
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.
16
Content available remote Solutions of the Schrödinger equation for Dirac delta decorated linear potential
80%
Uncu H. , Erkol H. , Demiralp E. , Beker H.
Open Physics
|
2005
|
tom 3
|
nr 2
303-323
EN
We have studied bound states of the Schrödinger equation for a linear potential together with any finite number (P) of Dirac delta functions. Forx [...] where 0f; 0x 1x 2x P , theσ i are arbitrary real numbers, and the potential is infinite forx
17
Content available remote Solutions of One-Dimensional Effective Mass Schrödinger Equation for PT-Symmetric Scarf Potential
80%
Zhang A. , Shi P. , Ling Y. , Hua Z.
Acta Physica Polonica A
|
2011
|
tom 120
|
nr 6
987-991
EN
The one-dimensional effective mass Schrödinger equation for PT-symmetric Scarf potential is investigated. The analytical expressions of energy eigenvalue and corresponding wave function are presented. They are accomplished by using an appropriate coordinate transformation to map the transformed exactly solvable one-dimensional Schrödinger equation with constant mass into the position-dependent mass equation. In the computation, three different forms of mass distributions are considered.
18
Content available remote Relativistic Paschen-Back Effect for the Two-Dimensional H-Like Atoms
80%
Poszwa A. , Rutkowski A.
Acta Physica Polonica A
|
2010
|
tom 117
|
nr 3
439-444
EN
The classification of states based on good quantum numbers for the two-dimensional Coulomb problem is proposed. The first order magnetic energy corrections are calculated using exact field-free analytic solutions of the Dirac equation as a zero-order approximation.
19
Content available remote Exact Solutions of Bose-Einstein Condensate in Linear Magnetic Field and Time-Dependent Laser Field
80%
Huang W. , Mao J. , Qiu W.
Acta Physica Polonica A
|
2011
|
tom 119
|
nr 3
294-297
EN
A generalized G'/G-expansion method is extended to construct exact solutions for the Gross-Pitaevskii equation with weak bias magnetic and time-dependent laser fields. Many types of exact solutions including hyperbolic function solution, trigonometric function solution and rational exact solution with parameters are obtained. In addition, soliton solutions are found.
20
Content available remote S-Wave Bound- and Resonant States of Two Fermions in Simple Cubic Lattice
80%
Bak M.
|
|
nr 4
808-811
EN
Resonant two-electron states are examined in attractive Hubbard model on simple cubic lattice and exact formula for scattering cross section in the limit of low density (empty lattice) is calculated. S-wave pair is considered by means of lattice Green functions (LGF). Analytical form of these functions found by Joyce is used facilitating calculations, which were greatly hindered before by the necessity of using LGF's tabulated values. It is found that the actual peak of scattering cross-section is formed on the lower band boundary in discrepancy with formulae of the theory of scattering in solids.
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