 Subjects -> ELECTRONICS (Total: 207 journals)
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- Density and pseudo-spin rotons in a bilayer of soft-core bosons
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Authors: F Pouresmaeeli; S H Abedinpour B Tanatar
First page: 125001
Abstract: We study the dynamics of a bilayer system of bosons with repulsive soft-core Rydberg-dressed interactions within the mean-field Bogoliubov-de Gennes approximation. We find roton minima in both symmetric and asymmetric collective density modes of the symmetric bilayer. Depending on the density of bosons in each layer and the spacing between two layers, the homogeneous superfluid phase becomes unstable in either (or both) of these two channels, leading to density and pseudo-spin-density wave instabilities in the system. Breaking the symmetry between two layers, either with a finite counterflow or a density imbalance renormalizes the dispersion of collective modes and makes the system more susceptible to density-wave instability.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-25T23:00:00Z
DOI: 10.1088/1361-6455/acd599
Issue No: Vol. 56, No. 12 (2023)
- Relativistic calculations of molecular electric dipole moments of singly
charged aluminium monohalides-
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Authors: R Bala; V S Prasannaa B P Das
First page: 125101
Abstract: In this work, we have studied the permanent electric dipole moments of singly charged aluminum monohalides in their electronic ground state, , using Kramers-restricted relativistic configuration interaction method. We report our results from this method in the singles and doubles approximation with those of Dirac–Fock calculations. For our finite field computations, quadruple zeta basis sets were employed. We discuss the electron correlation trends that we find in our calculated properties and have compared our results with those from literature, wherever available.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-18T23:00:00Z
DOI: 10.1088/1361-6455/acd496
Issue No: Vol. 56, No. 12 (2023)
- Two-body bound and edge bound states in a ladder lattice with synthetic
flux-
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Authors: Yi Zheng; Shi-Jie Yang
First page: 125301
Abstract: We study the composite nature of two interacting bosons in the presence of a uniform synthetic flux on a two-leg ladder. We identify the existence of in-cell two-body bound states and nearest-neighbor bound pairs. Under open boundary condition, edge states associated to the bound spectra arise even for the chiral ladder that is topological trivial. We present effective models to characterize the appearance of bound states, as well as to capture the localization and chiral properties of the edge bound state (EBS). Moreover, we incorporate the diagonal coupling into the ladder, constituting a Creutz model which supports topological phase transition. We show that the interplay of non-trivial band topology and the two-body interaction leads to topological EBS that is robust against local potential defect.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-25T23:00:00Z
DOI: 10.1088/1361-6455/acd66f
Issue No: Vol. 56, No. 12 (2023)
- Topical Review: Extracting molecular frame photoionization dynamics from
experimental data-
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Authors: Paul Hockett; Varun Makhija
First page: 112001
Abstract: Methods for experimental reconstruction of molecular frame (MF) photoionization dynamics, and related properties—specifically MF photoelectron angular distributions (PADs) and continuum density matrices—are outlined and discussed. General concepts are introduced for the non-expert reader, and experimental and theoretical techniques are further outlined in some depth. Particular focus is placed on a detailed example of numerical reconstruction techniques for matrix-element retrieval from time-domain experimental measurements making use of rotational-wavepackets (i.e. aligned frame measurements)—the ‘bootstrapping to the MF’ methodology—and a matrix-inversion technique for direct MF-PAD recovery. Ongoing resources for interested researchers are also introduced, including sample data, reconstruction codes (the Photoelectron Metrology Toolkit, written in python, and associated Quantum Metrology with Photoelectrons platform/ecosystem), and literature via online repositories; it is hoped these resources will be of ongoing use to the community.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-10T23:00:00Z
DOI: 10.1088/1361-6455/acd03e
Issue No: Vol. 56, No. 11 (2023)
- Mass-ratio dependent strong-field dissociation of artificial helium
hydride isotopologues-
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Authors: F Oppermann; S Mhatre, S Gräfe M Lein
First page: 115101
Abstract: We study the effect of the nuclear-mass ratio in a diatomic molecular ion on the dissociation dynamics in strong infrared laser pulses. A molecular ion is a charged system, in which the dipole moment depends on the reference point and therefore on the position of the nuclear center of mass, so that the laser-induced dynamics is expected to depend on the mass asymmetry. Whereas usually both the reduced mass and the mass ratio are varied when different isotopologues are compared, we fix the reduced mass and artificially vary the mass ratio in a model system. This allows us to separate effects related to changes in the resonance frequency, which is determined by the reduced mass, from those that arise due to the mass asymmetry. Numerical solutions of the time-dependent Schrödinger equation are compared with classical trajectory simulations. We find that at a certain mass ratio, vibrational excitation is strongly suppressed, which decreases the dissociation probability by many orders of magnitude.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-03T23:00:00Z
DOI: 10.1088/1361-6455/accb75
Issue No: Vol. 56, No. 11 (2023)
- Theoretical study of the spectroscopic constants of the ground state of
the diatomic Ba-RG (RG = Kr, Xe, Rn) based on the coupled cluster theory
with spin–orbit coupling-
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Authors: Wei-Qi Xian; Zhi-Peng Zhang, Zhe-Yan Tu, Hu Zhou, Lian-Bi Li Ai-Min Chen
First page: 115102
Abstract: The spectroscopic constants including equilibrium distance, harmonic frequency and binding energy of the ground state of the diatomic Ba-RG (RG = Kr, Xe, Rn) are studied by using the closed-shell coupled-cluster theory with spin–orbit coupling (SOC) at the singles, doubles, and non-iterative triples level [CCSD(T)] based on the two-component relativistic pseudo-potentials. The advantage of the adopted computational protocol is that the SOC is incorporated in the post-Hartree–Fock part (i.e. the couple-cluster iteration) which makes it possible to significantly improve the computational efficiency. The extrapolation to the complete basis set (CBS) limit is used to provide the most accurate computational values in the framework of the adopted theoretical approach. The computational values to the CBS limit show that the SOC effect decreases the equilibrium distance by 0.067 Å while the binding energy increases by 21.023 cm−1 for the heaviest Ba-Rn, but not significant in the Ba-Kr and Ba-Xe. To date, both experimental and theoretical spectroscopic constants for Ba-Rn are unavailable, the present work thus provides the reliable theoretical results of the ground state of Ba-Rn for the future investigations.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-10T23:00:00Z
DOI: 10.1088/1361-6455/accf70
Issue No: Vol. 56, No. 11 (2023)
- Enhanced the Bi-(Tri-)partite entanglement between three magnons in a
cavity magnomechanics system-
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Authors: Abdelkader Hidki; Ya-long Ren, Abderrahim Lakhfif, Jamal El Qars Mostafa Nassik
First page: 115401
Abstract: We propose a scheme to generate steady-state bipartite and tripartite entanglement in the cavity magnomechanical system, which consists of a microwave (MW) cavity field, three magnons, and a phonon mode. The three magnons are coupled to the MW cavity via the magnetic dipole interaction, and one of them is also coupled to the phonon mode through the magnetostrictive force. By utilizing the nonlinearity of the magnetostrictive force and the cavity-magnon interaction, the three magnons become mutually entangled, and the steady-state of the system displays a genuine tripartite entanglement. We found that there are optimum parameters, including the detunings and the cavity-magnon coupling, which lead to maximum entanglement. Moreover, the entanglement is robust against thermal effects.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-04T23:00:00Z
DOI: 10.1088/1361-6455/acce11
Issue No: Vol. 56, No. 11 (2023)
- Optical manipulation and conversion in whispering gallery mode resonators
with pump depletion-
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Authors: Liu Guo; Cong-Hua Yan
First page: 115402
Abstract: In this work, we study optical manipulation and conversion in the high-power regime, and thus the unavoidable intrinsic coupling between the pump light and the signal light, i.e. pump depletion, needs to be included. Compared with the transmission properties that are insensitive to the power of the signal light in the low-power regime with pump non-depletion, our results in the high-power regime with pump depletion show that the resonant transmission coefficients of the nonlinearity can be manipulated from 0 to non-zero by adjusting the intensities of the signal light, and thus it behaves as an intensity-dependent all-optical switch. Although the resonant conversion efficiencies from four-wave mixing of the nonlinearity are generally suppressed by power-dependent frequency shifts as a result of self-phase modulation (SPM) and cross-phase modulation (XPM) in the high-pump regime, the conversion efficiencies can be amplified by tuning the frequency detuning of the signal and pump lights. The optical transmission coefficients and conversion efficiencies can also be enhanced by utilizing the interplay between and nonlinearities in the high-pump regime. The mechanism of enhancing the conversion efficiencies to overcome the suppression from SPM and XPM provides a new way to convert frequency with high efficiencies.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-05-10T23:00:00Z
DOI: 10.1088/1361-6455/acccc2
Issue No: Vol. 56, No. 11 (2023)
- Simulating noisy quantum channels via quantum state preparation algorithms
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Authors: Marcelo S Zanetti; Douglas F Pinto, Marcos L W Basso Jonas Maziero
First page: 115501
Abstract: In Xin et al (2017 Phys. Rev. A 96 062303) and Wei et al (2018 Sci. China Phys. Mech. Astron.61 70311), the authors reported an algorithm to simulate, in a circuit-based quantum computer, a general quantum channel (QC). However, the application of their algorithm is limited because it entails the solution of intricate non-linear systems of equations in order to obtain the quantum circuit to be implemented for the simulation. Motivated by this issue, in this article we identify and discuss a simple way to implement the simulation of QCs on any d-level quantum system through quantum state preparation algorithms, that have received much attention in the quantum information science literature lately. We exemplify the versatility of our protocol applying it to most well known qubit QCs, to some qudit QCs, and to simulate the effect of Lorentz transformations on spin states. We also regard the application of our protocol for initial mixed states. Most of the given application examples are demonstrated using IBM’s quantum computers.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-04-27T23:00:00Z
DOI: 10.1088/1361-6455/accb76
Issue No: Vol. 56, No. 11 (2023)
- Multi-stage Stern–Gerlach experiment modeled
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Authors: Lihong V Wang
First page: 105001
Abstract: In the classic multi-stage Stern–Gerlach experiment conducted by Frisch and Segrè, the Majorana (Landau–Zener) and Rabi formulae diverge far from the experimental observation while the physical mechanism for electron-spin collapse remains unidentified. Here, introducing the physical co-quantum concept provides a plausible physical mechanism and predicts the experimental observation in absolute units without fitting (i.e. no parameters adjusted), with a p-value less than one per million, which is the probability that the co-quantum theory happens to match the experimental observation purely by chance. Further, the co-quantum concept is corroborated by exactly statistically reproducing the wave function, density operator, and uncertainty relation for electron spin in Stern–Gerlach experiments.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2023-04-24T23:00:00Z
DOI: 10.1088/1361-6455/acc149
Issue No: Vol. 56, No. 10 (2023)
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