Subjects -> ELECTRONICS (Total: 202 journals)
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 Journal of Physics B: Atomic, Molecular and Optical PhysicsJournal Prestige (SJR): 0.85 Citation Impact (citeScore): 2Number of Followers: 31      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0953-4075 - ISSN (Online) 1361-6455 Published by IOP  [74 journals]
• Integrated photonic quantum walks
• Authors: Markus Gräfe; Alexander Szameit
First page: 073001
Abstract: Quantum walks (QWs) are one of the fundamental concepts in quantum information science, being an essential component for various new applications. Implementing QWs using integrated photonic waveguide lattices allows for realizing long evolution times, for exploring novel lattice geometries, and even for controllable coupling to the environment. This tutorial gives an introduction to the field of on-chip QWs of single photons and photon pairs featuring non-classical two-photon correlations.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-11T00:00:00Z
DOI: 10.1088/1361-6455/ab6cfc
Issue No: Vol. 53, No. 7 (2020)

• Electron–electron interaction energy in He-like isoelectronic sequence
with Z = 2–133
• Authors: Mingwu Zhang; Deyang Yu Xiaobin Ding
First page: 075003
Abstract: Via a differential comparison of the binding energies between H- and He-like ions, the electron–electron interaction energies of the states ##IMG## [http://ej.iop.org/images/0953-4075/53/7/075003/jpbab6d19ieqn1.gif] {$1{s}^{2},$} ##IMG## [http://ej.iop.org/images/0953-4075/53/7/075003/jpbab6d19ieqn2.gif] {${\left(1s,2s\right)}_{0,1},$} ##IMG## [http://ej.iop.org/images/0953-4075/53/7/075003/jpbab6d19ieqn3.gif] {${\left(1s,{\rm{n}}{p}_{1/2}\right)}_{0,1},$} ##IMG## [http://ej.iop.org/images/0953-4075/53/7/075003/jpbab6d19ieqn4.gif] {${\left(1s,{\rm{n}}{p}_{3/2}\right)}_{1,2},$} ##IMG## [http://ej.iop.org/images/0953-4075/53/7/075003/jpbab6d19ieqn5.gif] {${\left(2s,{\rm{n}}{p}_{1/2}\right)}_{0,1}$} and ##IMG## [http://ej.iop.org/images/0953-4075/53/7/075003/jpbab6d19ieqn6.gif] {${\left(2s,{\rm{n}}{p}_{3/2}\right)}_{1,2}$} ( ##IMG## {\${\...}
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-09T00:00:00Z
DOI: 10.1088/1361-6455/ab6d19
Issue No: Vol. 53, No. 7 (2020)

• Asymptotic quantum defect of singly excited two-electron atoms at the
critical charge
• Authors: Linhong Chen; James S Wright, Jacob Katriel Vladimir I Korobov
First page: 075004
Abstract: The validity of a conjecture concerning the asymptotic behavior of a singly-occupied atomic orbital of type nℓ outside an N -electron core, upon approaching the critical charge (below which this electron is not bound), is definitively demonstrated. According to this conjecture, this orbital becomes an infinitely diffuse hydrogenic orbital of type ( n − n ℓ ) ℓ , where n ℓ is the number of occupied (or partially occupied) core subshells with angular momentum ℓ . An indicator of this asymptotic behavior is the asymptotic value of the corresponding quantum defect lim Z → N δ n ℓ = n ℓ . To establish this limiting behavior for several singly-excited states of the two-electron atom, we apply the explicitly correlated Hylleraas-type variational exponential expansion to evaluate highly precise energies, that allow the critical charge ( Z c = 1) to be approached much more closely...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-11T00:00:00Z
DOI: 10.1088/1361-6455/ab6df8
Issue No: Vol. 53, No. 7 (2020)

• Generalized oscillator strengths of low-lying electronic excitations in
acetylene
• Authors: Noboru Watanabe; Masahiko Takahashi
First page: 075202
Abstract: This paper reports a theoretical study on electron-impact excitations of acetylene. Momentum-transfer-dependent generalized oscillator strengths (GOSs) or GOS profiles have been calculated using wavefunctions at the equation-of-motion coupled-cluster singles and doubles level. In the calculation the influence of molecular vibration has been taken into account. The computed results are in overall agreement with experimental GOS profiles reported in the literature. Our theoretical analysis has revealed prominent roles of bending vibrations in the low-lying valence excitations induced by electron impact.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-09T00:00:00Z
DOI: 10.1088/1361-6455/ab6cc5
Issue No: Vol. 53, No. 7 (2020)

• Fully differential cross sections for ionization of Li(2s) and Li(2p) by
16 MeV Li 2+ impact
• Authors: A Igarashi; L Gulyás
First page: 075203
Abstract: Fully differential cross sections for the single ionization of Li(2s) and Li(2p) by 16 MeV Li 2+ are discussed within the framework of the continuum distorted wave with eikonal initial sate approximation. The obtained results are compared with those of the measurements and other theoretical calculations (Ghanbari-Adivi et al 2017 J. Phys. B: At. Mol. Opt. Phys . 50 215202). Overall, good agreements are observed among results of the various calculations, and remarkable differences appear only in a few cases. The theoretical calculations reproduce well the angular distributions of the ejected electrons, however, deviations can be observed in the dependence of the cross sections on the projectile’s momentum transfer. Improved agreement between the theory and experiment is obtained when experimental uncertainties related to the determination of the momentum transfer values are taken into account in the evaluation. Asymmetries and double-peak structures ...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-10T00:00:00Z
DOI: 10.1088/1361-6455/ab6d93
Issue No: Vol. 53, No. 7 (2020)

• Controllable splitting dynamics of a doubly quantized vortex in a
ring-shaped condensate
• Authors: Bo Xiong; Tao Yang, Yu-Ju Lin Daw-Wei Wang
First page: 075301
Abstract: We prepared a ring-shaped Bose–Einstein condensate with quantized circulation by imprinting a linear azimuthal phase. A doubly quantized vortex (DQV) can be generated and exist stably in the middle of the condensate cloud after the system is released into a rotationally symmetric harmonic trap. For an asymmetric trap with a small degree of anisotropy the generated DQV initially splits into two singly quantized vortices and revives again but eventually evolves into two unit vortices due to the dynamic instability. For the degree of anisotropy above a critical value, the DQV is extremely unstable and decays rapidly into two singlet vortices. The geometry-dependent lifetime of the DQV and vortex-induced excitations are also discussed intensively.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-11T00:00:00Z
DOI: 10.1088/1361-6455/ab707d
Issue No: Vol. 53, No. 7 (2020)

• A macrorealistic test in hybrid quantum optomechanics
• Authors: Marta Marchese; Hannah McAleese, Angelo Bassi Mauro Paternostro
First page: 075401
Abstract: We discuss a scheme for macrorealistic theories of the Leggett–Garg form (Leggett and Garg 1985 Phys. Rev. Lett. 54 857). Our scheme is based on a hybrid optomechanical system. It seems reasonable to test these inequalities with an optomechanical system, since in an optomechanical cavity it is possible to create non-classical states of the mirror through a projective measurement on the cavity field. We will present the protocol to generate such non-classicality for a general optomechanical cavity and after we will carry out a theoretical test for one of the possible formulations of these inequalities using a hybrid optomechanical system. Specifically, the inequality will be investigated for an harmonic oscillator coupled to a two-level system, which replaces the light field of the cavity. The aim is to reproduce, with this system, the evolution of a single spin-1/2 for which the inequality is violated; this is achievable through the conditioning of the two-level sy...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-09T00:00:00Z
DOI: 10.1088/1361-6455/ab6d18
Issue No: Vol. 53, No. 7 (2020)

• Complex structures in cavities with media displaying EIT: coexistence,
defects and selection mechanism
• Authors: M Eslami; R Kheradmand G-L Oppo
First page: 075402
Abstract: A cavity filled with a medium displaying electromagnetically induced transparency is shown to exhibit coexistence of complex transverse structures often leading to pattern competition. Because of multi-stability of the solutions, the asymptotic state in such a cavity crucially depends on the values of the control parameters and the initial conditions. The pattern competition can result in coexisting regions of pattern structures of different geometry separated by stable or metastable fronts. Here we propose a selection technique based on external periodic modulations for directing the system to a single pattern state of choice and thus removing the separation fronts. The control technique takes the system close to sub-sections in the phase space providing the operator with the choice of the final state from different multi-stable solutions. We extend the use of the technique to stationary or drifting structures composed of regions made of a single pattern state with different or...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-10T00:00:00Z
DOI: 10.1088/1361-6455/ab6d92
Issue No: Vol. 53, No. 7 (2020)

• Weak measurement amplification based on thermal noise effect
• Authors: Gang Li; Tao Wang He-Shan Song
First page: 075501
Abstract: Most studies for postselected weak measurement focus on using the pure Gaussian state as a pointer, which can only give an amplification limit reaching the level of the ground state fluctuation. When the pointer is initialized in a thermal state, we find that the amplification limit after the postselection can reach the level of thermal fluctuation, indicating that the amplification effect achieving the level of thermal fluctuation is also increased with the temperature growth, and also that the amplification mechanism is different from that with pure Gaussian-state pointer. To illustrate these results, we propose two schemes to implement room temperature amplification of the mechanical oscillator’s displacement caused by a single photon in the optomechanical system. The two schemes both enhance the mechanical oscillator’s original displacement by nearly seven orders of magnitude, attaining sensitivity to displacements of ∼0.26 nm. Such amplification effect can be used to observ...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-12T00:00:00Z
DOI: 10.1088/1361-6455/ab6d91
Issue No: Vol. 53, No. 7 (2020)

• Circular dichroism in XUV-assisted high-order harmonic generation
• Authors: T S Sarantseva; D V Knyazeva, N L Manakov M V Frolov
First page: 075601
Abstract: The effect of circular dichroism (CD) is predicted for high-order harmonic generation (HHG) by unpolarized atoms subjected to an intense linearly polarized infrared laser field and a weak (perturbative) elliptically polarized extreme ultraviolet (XUV) field. The CD effect is analyzed within the phenomenological consideration of the HHG amplitude in terms of intrinsic vectors of the problem. We show that the CD effect originates from a specific interference between the real and imaginary parts of the HHG amplitude corresponding to the zero- and first-order of perturbation theory in the XUV field. Conditions optimal for observation of the CD effect are discussed and a quantitative estimate for its magnitude is obtained within the time-dependent effective range model.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2020-03-11T00:00:00Z
DOI: 10.1088/1361-6455/ab6cc6
Issue No: Vol. 53, No. 7 (2020)

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