 Subjects -> ELECTRONICS (Total: 207 journals)
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- Benchmark of few-level quantum theory vs ab initio numerical solutions for
the strong-field
Autler–Townes effect in photoionization of hydrogen-
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Authors: D Younis; J H Eberly
First page: 164001
Abstract: The temporal and spectral consequences of an intermediate resonance en route to photoionization are
investigated theoretically in two ways: by solving few-level model equations and by ab initio
numerical solution of the time-dependent Schrödinger equation, in both cases for hydrogen in three
dimensions. The model consists of atomic states resonantly field-dressed in a three-level reduction
of the hydrogen atom that consists of the 2 p –3 d (Balmer) transition and one energetically-distant
continuum state. The model's level occupation probabilities are derived from three Schrödinger
amplitude equations and are benchmarked against an ab initio numerical solution for the hydrogen
electron's wavefunction under the same field. We examine contrasts between the results of the two
approaches with a particular focus on Autler–Townes doublets that appear in the photoelectron
spectrum.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-19T23:00:00Z
DOI: 10.1088/1361-6455/ac7d7f
Issue No: Vol. 55, No. 16 (2022)
- Effect of three-body interactions on Bénárd–von Kármán vortex street
in quasi-2D Bose–Einstein
condensate-
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Authors: Xiaobei Fan; Xueping Ren, Jing Wang, Kaihua Shao, Qingqing Wang, Yuexing Zhao, Hongjuan Meng Yuren Shi
First page: 165001
Abstract: The dynamical behaviors of a quasi-2D Bose–Einstein condensate (BEC) with three-body interactions
through a moving obstacle potential are studied numerically. Various vortex structures are
discovered under different strength of three-body interactions when the two-body interaction is
attractive or repulsive. When the width and moving velocity of the obstacle potential reach critical
value, periodic anti-symmetric double-row vortex pairs will be released alternately in BEC, and a
Bénárd–von Kármán (BvK) vortex street will be formed eventually. We noticed that the BvK vortex
street can be excited when the three-body interactions are taken into account even if the two-body
interaction is attractive. The mean value of the distance between two vortex rows to the distance
between two vortex pairs in the same row is about 0.2. It is slightly smaller than the stability
condition 0.28 without considering the three-body interaction. The parameter regions of vortex
patterns at different three-body interaction are determined. It is found that an appropriate value
of three-body interaction with larger velocity and lesser width is favorable to the formation of BvK
vortex street. In a pair of point vortices, the distance and angular velocity between them are
nearly invariant while they rotate around their center. The internal rule of vortex pair are also
analyzed by calculating the drag force acting on the obstacle potential. Finally, we proposed an
experimental protocol to realize the vortex street in 87 Rb BEC with three-body interactions.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-14T23:00:00Z
DOI: 10.1088/1361-6455/ac7ca5
Issue No: Vol. 55, No. 16 (2022)
- Calculations of shake-up satellites intensities in photoelectron spectra
by generalized
configuration interaction method-
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Authors: V G Yarzhemsky; L V Chernysheva
First page: 165002
Abstract: Satellites i.e. two-hole-one-particle states appear due to many-electron correlations in
photoelectron spectra in addition to main lines corresponding to one-hole states. The correct
assignment of these states is important for understanding the photoionization processes and for
materials analysis by photoelectron spectroscopy. In the present work two different existing
methods, which use overlap or Coulomb interaction matrix elements are considered and a new method is
proposed. In this technique many-electron effects of satellites origin and interactions between
satellite states are accounted for simultaneously by solving secular matrix. The method is applied
to satellite states 2 p −2 3 p (4 p ), 2 p −2 3 s , 2 p −2 3 d of Ne photoionization for which
contradiction between two interpretations existed. The results of calculations unambiguously support
one the interpretations.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-20T23:00:00Z
DOI: 10.1088/1361-6455/ac7e94
Issue No: Vol. 55, No. 16 (2022)
- HF, DF, TF: approximating potential curves, calculating rovibrational
states-
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Authors: Laura E Angeles-Gantes; Horacio Olivares-Pilón
First page: 165101
Abstract: A simple analytical expression for the potential energy curve for the ground state X 1 Σ + of the
hydrogen fluoride molecule HF obtained in the framework of the Born–Oppenheimer approximation is
proposed. This analytical expression for the potential energy curve is based in the two point Padé
approximation, which correctly reproduces the asymptotic behavior at small R → 0 and large R → ∞
internuclear distances, and position and depth of potential well, leading to the accuracy of 4–5
decimal digits when compared with experimental data. The rovibrational spectra of the diatomic
molecule HF is calculated by solving the Schrödinger equation for nuclear motion using the
Lagrange-mesh method. The ground state X 1 Σ + contains 21 vibrational states ( ν , 0) and 724
rovibrational states ( ν , L ) with maximal angular momentum equal to 55. The change of reduced mass
in the Schrödinger equation for nuclear motion allows us to obtain the rovibrational spectrum of the
ground state potential curve of the deuterium fluoride DF (contains 29 vibrational states ( ν , 0)
and 1377 rovibrational states ( ν , L )) and tritium fluoride TF (contains 35 vibrational states ( ν
, 0) and 1967 rovibrational states ( ν , L )) with maximal angular momenta 76 and 92, respectively.
Entire rovibrational spectra is presented for the HF molecule and its two isotopologues DF and TF.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-17T23:00:00Z
DOI: 10.1088/1361-6455/ac7d26
Issue No: Vol. 55, No. 16 (2022)
- Study of electron impact elastic scattering from Kr@C60 and Xe@C60 using a
fully relativistic
approach-
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Authors: Dibyendu Mahato; Lalita Sharma, Saumyashree Baral, Subhasish Saha, Jobin Jose Rajesh Srivastava
First page: 165201
Abstract: In the present work, a detailed study has been reported on electron impact elastic scattering from
krypton (Kr) and xenon (Xe) atoms when confined in two different types of C 60 potentials viz (a)
hard annular square well (ASW) and (b) diffused Gaussian annular square well (GASW). The Dirac
equations are solved using these potentials for encaged Kr and Xe in C 60 . First, bound state
Dirac–Fock wave functions of these encaged Kr and Xe atoms are found by utilizing modified general
relativistic atomic structure package and thereafter, the charge densities and static potentials of
the endohedral Kr@C 60 and Xe@C 60 are obtained. Further, using these, the Dirac equations are
solved by the relativistic partial wave phase shift analysis method and the scattering amplitudes in
terms of phase shifts are obtained. Thereafter, the electron elastic differential and integrated
cross sections of Kr@C 60 and Xe@C 60 along with the C 60 are calculated in the range of 0.1–15 eV
incident electron energies. Presently, no experimental and theoretical results are available to
compare our electron scattering cross section results from Kr@C 60 and Xe@C 60 ; thus, we have shown
the cross section results obtained from ASW and GASW potential and compared them.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-11T23:00:00Z
DOI: 10.1088/1361-6455/ac7b59
Issue No: Vol. 55, No. 16 (2022)
- Twisted electron impact single ionization coincidence cross-sections for
noble gas atoms-
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Authors: Nikita Dhankhar; Soham Banerjee R Choubisa
First page: 165202
Abstract: We present the angular profiles of the triple differential cross-section (TDCS) for the (e, 2e)
process on the noble gas atoms, namely He (1s), Ne (2s and 2p), and Ar (3p), for the plane wave and
the twisted electron impact. We develop the theoretical formalism in the first Born approximation
(FBA). The present study compares the TDCS for different values of orbital angular momentum number m
and opening angles θ p of the twisted electron beam with that of the plane wave beam in co-planar
asymmetric geometry. In addition, we also investigate the TDCS for macroscopic targets to explore
the influence of the opening angle θ p of the twisted electron beam on the TDCS. Our results show
that the peaks in binary and recoil regions shift from the momentum transfer direction. The results
also show that for larger opening angles, the peaks for p -type orbitals split into double-peak
structures, which are not observed in the plane wave results for the given kinematics. The angular
profiles for averaged cross-section show the dependence of TDCS on the opening angles, especially
for the larger opening angles, which are significantly different from the plane wave TDCS.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-18T23:00:00Z
DOI: 10.1088/1361-6455/ac7d80
Issue No: Vol. 55, No. 16 (2022)
- Imbert–Fedorov shift at black phosphorus-coated surfaces
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Authors: Huan Chen; Honghua Ma, Yanyan Ding, Qianguang Li Xunong Yi
First page: 165401
Abstract: In this work, the Imbert–Fedorov (IF) shift is systematically investigated when a light beam is
incident on black phosphorus. Using the angular spectrum theory, we obtain the analytical
expressions of IF shifts for a p -polarized and s -polarized beam. Based on the theoretical
analysis, numerical calculations are performed. The results indicate that the IF shifts depend on
the incident angle, polarization and frequency of incident light, as well as the optical axis angle
and electron concentration of black phosphorus. These characteristics make it possible to accurately
measure the physical parameters of two-dimensional atomic materials based on IF shifts.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-18T23:00:00Z
DOI: 10.1088/1361-6455/ac7d25
Issue No: Vol. 55, No. 16 (2022)
- Cavity-assisted coherent feedback cooling of a mechanical resonator to the
ground-state in the
unresolved sideband regime-
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Authors: Daryoosh Mansouri; Behrooz Rezaie, Abolfazl Ranjbar N Abolghasem Daeichian
First page: 165501
Abstract: This paper presents a cavity-assisted coherent feedback scheme to cool a mechanical resonator to the
ground-state in a weak optomechanical coupling setup. Based on the theory of sideband cooling,
resolved sideband regime is a mandatory condition for the ground-state cooling (GSC) in
optomechanical systems. Assisted cooling and feedback cooling methods have been proposed and shown
to be beneficial for cooling in unresolved sideband cases. In this paper, a cooling method is
proposed by combining both approaches. In the proposed method, a coherent feedback loop is added to
a cavity-assisted optomechanical system to enhance the cooling performance. The proposed feedback
aims to reach the mechanical ground-state in the unresolved sideband regime (USR). Rate equations of
the mechanical resonator are derived, and then, by applying Fermi's golden rule and analyzing the
fluctuation spectrum of the optical force, optimal conditions for cooling are obtained. Results show
that applying coherent feedback, improves the cooling performance of the system significantly and it
is possible to achieve GSC in USR. Moreover, it is shown that the proposed method is capable of
cooling the mechanical resonator to much lower energy levels than it is achievable in cavity
assisted method.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-13T23:00:00Z
DOI: 10.1088/1361-6455/ac7d27
Issue No: Vol. 55, No. 16 (2022)
- Optical pumping and relaxation of atomic population in assorted conditions
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Authors: Saptarshi Roy Chowdhury; Swarupananda Pradhan
First page: 165502
Abstract: Precise control and knowledge over atomic dynamics is central to the advancement of quantum
technology. The different experimental conditions namely, atoms in a vacuum, antirelaxation coated
and buffer gas filled atomic cells provide complementary platforms for such investigations. The
extent of changes in optical pumping, velocity changing collision and hyperfine changing collision
rates associated with these conditions are discussed. There is a phenomenal change in the optical
density by a factor of>25 times in the presence of a control field in a buffer gas environment. We
found confinement induced enhanced optical pumping as the mechanism behind the observed transparency
in buffer gas cell. The diffusive velocity of atoms were measured to be ∼25 ± 12 m s −1 and ⩽8 ±
4 m s −1 for antirelaxation coated and buffer gas filled cells respectively. The measurements were
carried out for 85 Rb atoms in natural isotopic composition using pump–probe spectroscopy. The
studies will have useful application in measurements of relaxation rates, quantum memory, quantum
repeaters and atomic devices.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-17T23:00:00Z
DOI: 10.1088/1361-6455/ac7ca6
Issue No: Vol. 55, No. 16 (2022)
- Exploring symmetries in photoelectron holography with two-color linearly
polarized fields-
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Authors: T Rook; C Figueira de Morisson Faria
First page: 165601
Abstract: We investigate photoelectron holography in bichromatic linearly polarized fields of commensurate
frequencies rω and sω , with emphasis on the existing symmetries and for which values of the
relative phase between the two driving waves they are kept or broken. Using group-theoretical
methods, we show that, additionally to the well-known half-cycle symmetry, which is broken for r + s
odd, there are reflection symmetries around the field zero crossings and maxima, which may or may
not be kept, depending on how both waves are dephased. The three symmetries are always present for
monochromatic fields, while for bichromatic fields this is not guaranteed, even if r + s is even and
the half-cycle symmetry is retained. Breaking the half-cycle symmetry automatically breaks one of
the other two, while, if the half-cycle symmetry is retained, the other two symmetries are either
both kept or broken. We analyze how these features affect the ionization times and saddle-point
equations for different bichromatic fields. We also provide general expressions for the relative
phases ϕ which retain specific symmetries. As an application, we compute photoelectron momentum
distributions for ω − 2 ω fields with the Coulomb quantum orbit strong-field approximation and
assess how holographic structures such as the fan, the spider and interference carpets behave,
focusing on the reflection symmetries. The features encountered can be traced back to the field
gradient and amplitude affecting ionization probabilities and quantum interference in different
momentum regions.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2022-07-12T23:00:00Z
DOI: 10.1088/1361-6455/ac7bbf
Issue No: Vol. 55, No. 16 (2022)
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