<?xml version="1.0" encoding="utf-8"?>
    <rss version="2.0">
      <channel xmlns:content="http://purl.org/rss/1.0/modules/content/">
        <title>Frontiers in Physics | Atomic and Molecular Physics section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/physics/sections/atomic-and-molecular-physics</link>
        <description>RSS Feed for Atomic and Molecular Physics section in the Frontiers in Physics journal | New and Recent Articles</description>
        <language>en-us</language>
        <generator>Frontiers Feed Generator,version:1</generator>
        <pubDate>2026-05-13T05:23:02.179+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1811840</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1811840</link>
        <title><![CDATA[Strain wave structure of electron and positron]]></title>
        <pubdate>2026-05-13T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Gurcharn S. Sandhu</author><author>Ishaan S. Dhindsa</author>
        <description><![CDATA[By treating physical space as an elastic continuum, we show that elementary particles and their fields can be represented by stress–strain wave packets in the elastic space continuum. Dynamic equilibrium equations of elasticity reduce to vector wave equations involving displacement vectors in this continuum. We derive the equivalence between displacement vector U and the magnetic vector potential A to show that electromagnetic fields are manifestations of stress–strain fields in this continuum. The structure of the electron is modeled on a spherically symmetrical strain wave solution of the vector wave equilibrium equation. The solution consists of a central standing strain wave core approximately 2 fm in radius, surrounded by a radially decaying field of phase waves propagating outward for the positron and inwards for the electron. Approximately 37.3% of the energy of the electron is contained in its wave field and the remaining in the central standing wave core. We also derive the Coulomb interaction between two electrons and verify Coulomb’s law of electrostatics. The intrinsic electrostatic field, intrinsic spin, and magnetic field effects of the electron are derived from its strain wave structure. We also verify the Biot–Savart law for motion-induced magnetic fields and indicate the origin of De Broglie matter waves.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1635859</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1635859</link>
        <title><![CDATA[Theoretical study of spin-orbit coupling and laser cooling for HBr molecule with first-overtone spectral calculations]]></title>
        <pubdate>2025-10-06T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Khadija Yassine</author><author>Nayla El-Kork</author><author>Nariman Abu El Kher</author><author>Ghassan Younes</author><author>Mahmoud Korek</author>
        <description><![CDATA[IntroductionThe electronic structure of the HBr molecule was investigated with particular attention to the spin–orbit coupling effect, aiming to assess its suitability for laser cooling applications.MethodsAb initio CASSCF/MRCI+Q calculations were carried out to obtain low-lying adiabatic potential energy curves with and without spin–orbit coupling taken into consideration. Static and transition dipole moments were evaluated, and the DUO and ExoCross programs were employed to simulate rovibronic spectra. Franck–Condon factors were calculated for transitions between the ground and excited electronic states.ResultsThe spectroscopic constants of several electronic states were derived and compared with available literature values, showing good agreement. The Franck–Condon factor analysis identified a transition as favorable for Doppler and Sisyphus laser cooling. Radiative lifetimes, branching ratios, Doppler and recoil temperatures, and slowing distances were determined. A four-laser cooling scheme in the deep-UV region was proposed. Simulated absorption spectra for the P(2) and R(7) transitions in the first-overtone (v = 0–2) band reproduced experimental data with reasonable accuracy.DiscussionThese findings confirm HBr as a promising candidate for laser cooling, supported by reasonably accurate ab initio potential and dipole moment curves. The proposed scheme and agreement with experimental spectra strengthen the feasibility of experimental implementation.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1527062</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1527062</link>
        <title><![CDATA[The cooling prospect of hydrogenated nitrogen ions for quantum defect integration]]></title>
        <pubdate>2025-07-18T00:00:00Z</pubdate>
        <category>Opinion</category>
        <author>Masatomi Iizawa</author><author>Yasuhito Narita</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1422098</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1422098</link>
        <title><![CDATA[Reverse degree-based topological indices study of molecular structure in triangular ϒ-graphyne and triangular ϒ-graphyne chain]]></title>
        <pubdate>2024-08-14T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Abdul Hakeem</author><author>Nek Muhammad Katbar</author><author>Hisamuddin Shaikh</author><author>Fikadu Tesgera Tolasa</author><author>Oshaque Ali Abro</author>
        <description><![CDATA[Topological indices are mathematical descriptors of the structure of a molecule that can be used to predict its properties. They are derived from the graph theory, which describes the topology of a molecule and its connectivity. The main objective is mathematical modeling and topological properties of ϒ-graphyne. Current research focuses on two structures made from hexagonal honeycomb graphite lattices named triangular ϒ-graphyne and triangular ϒ-graphyne chains. The authors have simultaneously computed the first and second Reverse Zagreb indices, reverse hyper-Zagreb indices, and their polynomials. This research also derives mathematical closed-form formulas for some of its fundamental degree-based molecular descriptors. Researchers have been trying to synthesize a novel carbon form called Graphyne. For over a decade but with no success. Recently, some researchers have made a breakthrough in generating Carbons elusive allotrope and solved a long-standing problem in carbon materials. This wonder material is created to rival the conductivity of graphene but with control. These results opened new ways of research in the fields of semiconductors, electronics and optics. Furthermore, graphical and tabular results will help to investigate the structure-property relationships in γ-graphyne.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1453868</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1453868</link>
        <title><![CDATA[Erratum: Revealing quantum effects in bosonic Josephson junctions: a multi-configuration atomic coherent state approach]]></title>
        <pubdate>2024-07-08T00:00:00Z</pubdate>
        <category>Erratum</category>
        <author>Frontiers Production Office </author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1361070</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1361070</link>
        <title><![CDATA[Commentary: Solutions of the Schrodinger equation of the shifted screened Kratzer potential and its thermodynamic functions using the extended Nikiforov–Uvarov method]]></title>
        <pubdate>2024-04-30T00:00:00Z</pubdate>
        <category>General Commentary</category>
        <author>Francisco M. Fernández</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1362594</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1362594</link>
        <title><![CDATA[Energy losses of highly charged Arq+ ions during grazing incidence on tungsten surfaces]]></title>
        <pubdate>2024-03-21T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Zun Xie</author><author>Xianwen Luo</author>
        <description><![CDATA[In this study, we investigate the energy loss of highly charged ions interacting with various tungsten surfaces. The analysis primarily focuses on elucidating the impact of electron density distributions on energy loss of ions. Furthermore, we explore the correlation between surface azimuthal angles and energy loss under both uniform and inhomogeneous electron density distributions. Utilizing the classical over-the-barrier model (COBM), simulations involving trajectory calculations, energy loss, charge-exchange processes, and surface electron distributions, etc., were performed. Remarkably, the significant influence of axial channeling of surfaces on ion energy loss is observed. For the comparison of ion energy loss under uniform and inhomogeneous electron density distributions, the results reveal a more pronounced effect of electron density inhomogeneity on ion energy loss at higher energy-loss values. Additionally, the calculated energy-loss spectra of Ar16+ ions grazing on graphite surfaces show reasonable agreement with experimental data. These findings are crucial for understanding the surface structure of crystals.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1377829</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1377829</link>
        <title><![CDATA[Experiment and analysis of state preparation for atom interferometry]]></title>
        <pubdate>2024-03-08T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Xu Zhang</author><author>Qi-Xue Li</author><author>Huan-Kai Zhang</author><author>Ji-Xun Liu</author><author>Guo-Chao Wang</author><author>Xiao-Xiao Ma</author><author>Ling-Xiao Zhu</author><author>Shu-Hua Yan</author>
        <description><![CDATA[The state preparation is a crucial procedure in atom interferometry; however, there is a shortage of detailed experimental studies on determining the optimal method for achieving this. This paper investigates and compares two methods for state preparation: the combined use of microwave and Raman light (M-R) and the combined use of optical pumping, microwave, and Raman light (O-M-W). The experimental results demonstrate that the M-R method improves the efficiency of Raman transitions for atom interference, which is helpful in enhancing the contrast of the interference fringes. The O-M-R method increases the quantity of prepared atoms, thereby enhancing the signal-to-noise ratio of the detected signals. This work helps provide a useful experimental basis and reference for researchers to design a suitable state preparation scheme.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1325239</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1325239</link>
        <title><![CDATA[Quantum physics cannot be captured by classical linear hidden variable theories even in the absence of entanglement]]></title>
        <pubdate>2024-02-29T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Kawthar Al Rasbi</author><author>Lewis A. Clark</author><author>Almut Beige</author>
        <description><![CDATA[Recent experimental tests of Bell inequalities confirm that entangled quantum systems cannot be described by local classical theories but still do not answer the question whether or not quantum systems could, in principle, be modeled by linear hidden variable theories. In this paper, we study the quantum trajectories of a single qubit that experiences a sequence of repeated generalized measurements. It is shown that this system, which constitutes a hidden quantum Markov model, is more likely to produce complex time correlations than any classical hidden Markov model with two output symbols. From this, we conclude that quantum physics cannot be replaced by linear hidden variable theories. Indeed, it has already been recognized that not only entanglement but also non-classical time correlations of quantum systems with quantum feedback are a valuable resource for quantum technology applications.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1312930</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1312930</link>
        <title><![CDATA[Enhanced microwave-atom coupling via quadrupole transition-dressed Rydberg atoms]]></title>
        <pubdate>2024-02-06T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yijie Du</author><author>Nan Cong</author><author>Yao Liu</author><author>Ziyao Lyu</author><author>Jun He</author><author>Renfu Yang</author>
        <description><![CDATA[The power broadening of a coupling laser can be converted into two-photon detuning by electromagnetically induced transparency (EIT), resulting in a residual Doppler effect. The residual Doppler effect in a ladder-type EIT in a room-temperature atom ensemble is further amplified through a wavelength mismatch effect between the probe and coupling laser beams, which reduces the atomic coupling of light or microwaves. We measured the Rydberg spectra of the electric dipole (E1) and electric quadrupole (E2) microwave transitions, demonstrating that the reduction in the Rydberg EIT signal can be recovered through far-off-resonance E2 microwave transition dressing and achieving an 8-dB enhancement in the Rydberg EIT signal. The frequency-dependent dressing of the E2 transition enables the shift of the dressed Rydberg states to be tuned, thereby providing a scalable approach to optimize the interaction between the Rydberg state and microwave field.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1257370</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1257370</link>
        <title><![CDATA[Evolution of Bose–Einstein condensate systems beyond the Gross–Pitaevskii equation]]></title>
        <pubdate>2023-11-23T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Yuli Lyanda-Geller</author>
        <description><![CDATA[While many phenomena in cold atoms and other Bose–Einstein condensate (BEC) systems are often described using the mean-field approaches, understanding the kinetics of BECs requires the inclusion of particle scattering via the collision integral of the quantum Boltzmann equation. A rigorous approach for many problems in the dynamics of the BEC, such as the nucleation of the condensate or the decay of the persistent current, requires, in the presence of factors making a symmetry breaking possible, considering collisions with thermal atoms via the collision integral. These collisions permit the emergence of vorticity or other signatures of long-range order in the nucleation of the BEC or the transfer of angular momentum to thermal atoms in the decay of persistent current, due to corresponding terms in system Hamiltonians. Here, we also discuss the kinetics of spin–orbit-coupled BEC. The kinetic equation for the particle spin density matrix is derived. Numerical simulations demonstrate significant effects of the collision integral on the dynamics of the spin–orbit-coupled BEC upon quenching of the Raman coupling that generates synthetic electric and magnetic fields.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1287860</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1287860</link>
        <title><![CDATA[Quantum Otto engine driven by quantum fields]]></title>
        <pubdate>2023-11-09T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Kensuke Gallock-Yoshimura</author><author>Vaishant Thakur</author><author>Robert B. Mann</author>
        <description><![CDATA[We consider a quantum Otto engine using an Unruh-DeWitt particle detector model which interacts with a quantum scalar field in curved spacetime. We express a generic condition for extracting positive work in terms of the effective temperature of the detector. This condition reduces to the well-known positive work condition in the literature under the circumstances where the detector reaches thermal equilibrium with the field. We then evaluate the amount of work extracted by the detector in two scenarios: an inertial detector in a thermal bath and a circulating detector in the Minkowski vacuum, which is inspired by the Unruh quantum Otto engine.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1176519</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1176519</link>
        <title><![CDATA[Research on vertical GaN devices based on gradient Al components]]></title>
        <pubdate>2023-11-02T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yonghe Chen</author><author>Ye Yang</author><author>Jianghui Zhai</author><author>Yuanyuan Sun</author>
        <description><![CDATA[A groove-gate power device with a linearly gradient Al composition P-type AlGaN superjunction (abbreviated as LG-SJCAVET) is proposed, which uses polarized P-type AlGaN material instead of the traditional P-type GaN buried layer, avoiding the technical bottleneck of achieving high-aspect-ratio P-type doping in GaN materials. Simulation results show that, under the same structural parameters, the breakdown voltage of LG-SJCAVET reaches 2954V, and the on-resistance is 1.669 mΩ⋅cm2, which is due to no current flowing through the P-pillar, resulting in an increase in on-resistance, while affecting the DC characteristics of the device. The power figure of merit of the device is 5.27 GW/cm2, which is 67.11% and 27.38% higher than that of the traditional device and P-type GaN buried layer device, respectively. Therefore, the LG-SJCAVET device solves the problems of the high technical difficulty of the traditional P-type GaN buried layer process, difficulty in activating acceptor impurities, and poor thermal stability of the device, exhibiting superior breakdown voltage characteristics.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1227652</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1227652</link>
        <title><![CDATA[Many-body theory calculations of positron scattering and annihilation in noble-gas atoms via the solution of Bethe–Salpeter equations using the Gaussian-basis code EXCITON+]]></title>
        <pubdate>2023-09-28T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>J. Hofierka</author><author>C. M. Rawlins</author><author>B. Cunningham</author><author>D. T. Waide</author><author>D. G. Green</author>
        <description><![CDATA[Scattering phase shifts and annihilation rates for low-energy positrons interacting with noble gas atoms are calculated ab initio using many-body theory implemented in the Gaussian-orbital code EXCITON+. Specifically, we construct the positron–atom correlation potential (self-energy) as the sum of three classes of infinite series describing the screened polarization, virtual positronium formation, and positron-hole repulsion found via the solution of Bethe–Salpeter equations for the two-particle propagators. The normalization of the continuum states is determined using the shifted pseudostates method [A. R. Swann and G. F. Gribakin, Phys. Rev. A 101, 022702 (2020)]. Comparison with the previous sophisticated B-spline many-body approach, which is restricted to atoms [J. Ludlow, D. G. Green, and G. F. Gribakin, Phys. Rev. A 90, 032712 (2014)], validates the EXCITON+ code, which can be used for multicentered targets including molecules, clusters, and condensed matter. Moreover, the relative effects of higher-order diagrams are quantified. It is found that the screening of the electron–positron Coulomb interaction represented by the infinite ring-diagram series (random-phase approximation) is compensated effectively by the additional electron-hole attraction corrections to it (the Bethe–Salpeter equation approximation) and that the use of the screened Coulomb interaction (screened at BSE level) in place of the bare Coulomb interaction in the virtual positronium and positron-hole ladder diagrams has negligible effect on both the phase shifts and Zeff. Our scattering length for Ne and Kr is in improved agreement with the convergent close-coupling result, and for Ar, the scattering length is in better agreement with the experiment compared with the previous B-spline many-body approach.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1221614</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1221614</link>
        <title><![CDATA[Revealing quantum effects in bosonic Josephson junctions: a multi-configuration atomic coherent state approach]]></title>
        <pubdate>2023-08-03T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yulong Qiao</author><author>Frank Grossmann</author>
        <description><![CDATA[The mean-field approach to two-site Bose–Hubbard systems is well-established and leads to non-linear classical equations of motion for population imbalance and phase difference. It can, for example, be based on the representation of the solution of the time-dependent Schrödinger equation either by a single Glauber state or by a single atomic (SU(2)) coherent state [S. Wimberger et al., Phys. Rev. A 103, 023326 (2021)]. We demonstrate that quantum effects beyond the mean-field approximation are easily uncovered if, instead, a multiconfiguration ansatz with a few time-dependent SU(2) basis functions is used in the variational principle. For the case of plasma oscillations, the use of just two basis states, whose time-dependent parameters are determined variationally, already gives a good qualitative agreement of the phase space dynamics with numerically exact quantum solutions. In order to correctly account for more non-trivial effects, like macroscopic quantum self-trapping, moderately more basis states are needed. For the onset of spontaneous symmetry breaking, however, a multiplicity of 2 gives a significant improvement already. In any case, the number of variational trajectories needed for good agreement with the full quantum results is orders of magnitude smaller than that in the semi-classical case, which is based on multiple mean-field trajectories.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1198477</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1198477</link>
        <title><![CDATA[The two-body collision controlled by the magnetic field and laser field near magnetic Feshbach resonance]]></title>
        <pubdate>2023-07-05T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Bing-Kuan Lyu</author><author>Bo-Wen Si</author><author>Zong-Han Yu</author><author>Gao-Ren Wang</author><author>Shu-Lin Cong</author>
        <description><![CDATA[It is crucial to control the collision between ultracold atoms by applying external fields. We developed a theoretical model for investigating the s-wave scattering of ultracold atoms controlled by the magnetic field and laser field. The calculation is performed by using the close-coupling method and mapped Fourier grid method. Due to the interference between the photoassociation and bound-to-bound transitions, the bound state in the continuum, which is a resonance with a vanishing width, occurs at the magnetic field position near the magnetic Feshbach resonance. The widths of resonances in the neighborhood of the bound state in the continuum are narrow. Changing the laser intensity can shift the magnetic field position where the bound state in the continuum occurs through modifying the ground molecular state to induce wide resonances at desired magnetic field positions. By increasing the resonance width, the tunability of the real part of the scattering length at resonances can be significantly improved. Changing the laser intensity can also adjust the coupling between the ground and excited molecular states. When the coupling between the ground and excited molecular states approaches zero, a resonance is induced, and the photoassociation and bound-to-bound transitions are both significantly suppressed at this resonance. Therefore, the atomic loss peak due to spontaneous emission does not appear at this resonance. The magnetic field position of this resonance is stable against the change in laser frequency.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1176783</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1176783</link>
        <title><![CDATA[Design and realization of a 3-K cryostat for a 10-cm ultrastable silicon cavity]]></title>
        <pubdate>2023-06-22T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Wen-Wei Wang</author><author>Zhi-Ang Chen</author><author>Han Zhang</author><author>Shize Du</author><author>Rui Wu</author><author>Chang Qiao</author><author>Shiyin Kuang</author><author>Xibo Zhang</author>
        <description><![CDATA[Crystalline optical cavities operating at cryogenic temperatures provide a promising route for realizing the next generation of ultrastable lasers with extremely low thermal noise floor. However, it remains challenging to realize a closed-cycle cryostat for cooling a relatively long cavity to very low temperatures. Here we report on the design and experimental realization of a cryostat operating continuously at 3.1 K for an ultrastable 10-cm silicon cavity. Based on a combination of active temperature control and passive thermal damping, we realize at 3.1 K a two-second temperature instability of 6 × 10−8 K for the cavity. By implementing separate supporting structures for the cryocooler and the sample chamber, we realize vibration control on the 1 × 10−7g level at one second in each spatial direction, where g is the gravitational acceleration. With all these features, our cryostat can support an ultrastable silicon cavity with instability near its fundamental thermal noise floor at averaging time of 1–50 s. With proper upgrading, our platform holds promise for realizing ultrastable lasers with 3 × 10−17 or better frequency stability, which will in turn enable numerous studies on precision metrology and quantum many-body physics.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1181399</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1181399</link>
        <title><![CDATA[The suppression of the probe laser pumping effect in SERF atomic magnetometer]]></title>
        <pubdate>2023-06-01T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Qian Cao</author><author>Yueyang Zhai</author><author>Binyue Huang</author><author>Renjie Li</author><author>Jiajie Li</author>
        <description><![CDATA[Introduction: A spin exchange relaxation free atomic magnetometer, as an ultra-highly sensitive magnetic field sensor, is limited by the performance of the probe laser system. The probe laser pumping effect (PLPE) hinders the increase in the performance of probe laser system.Methods: This study investigated the PLPE and proposed a method for suppressing the same. Through changes to the angle of a quarter wave plate and the addition of a triangular modulated magnetic field to the alkali atoms, the suppression point was determined.Results and discussion: Further, related parameters were measured for different degree of polarizations of the probe laser, which confirmed that the influence of PLPE on the magnetic field was the least at the suppressed point.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1187537</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1187537</link>
        <title><![CDATA[Matter-antimatter rearrangements using the R-matrix method]]></title>
        <pubdate>2023-05-26T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Elliott Kasoar</author><author>Martin Plummer</author><author>Lara Van Lydon</author><author>Mark M. Law</author>
        <description><![CDATA[Antihydrogen atoms, H―, are now routinely created and can be stored for long enough to allow comparison with ordinary matter. A major goal of these efforts is to test potential physics beyond the Standard Model. This will require further developments in the experiments including the accumulation of more antihydrogen atoms and their storage over longer times. The latter is limited by the unavoidable presence of normal hydrogen molecules. Interactions of H― with H2 lead to the destruction of the hard-won antimatter. Little is known about these interactions but quantitative information will be crucial in guiding experimental developments. Physically realistic modelling of rearrangement scattering of “heavy” antimatter particles (antiprotons, p―, and antihydrogen atoms) by normal matter molecules, such as H2 + H―→ Pn + Ps + H (where Pn represents protonium and Ps positronium), requires the development of new theoretical and computational methodologies. R-matrix theory offers a strong prospect for tackling such problems having proved itself in atomic, molecular and optical physics. It divides the problem into a computationally demanding but energy-independent inner region and simpler energy-dependent outer regions. We propose to adapt the new RmatReact ultracold chemistry approach for the more complex molecular matter-antimatter problems. Here, developments required for the inner region, the boundary and outer regions are outlined. We also report some preliminary bound-state calculations on the {p,p,p―} system and a study of the required mixed coordinate systems for the general effective 3-body case and their transformations at the R-matrix boundary surfaces.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2023.1177359</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2023.1177359</link>
        <title><![CDATA[Controlling multiple returnings in non-sequential double ionization with orthogonal two-color laser pulses]]></title>
        <pubdate>2023-05-24T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Xiaomeng Ma</author><author>Xiaofan Zhang</author><author>Aihong Tong</author>
        <description><![CDATA[With the three-dimensional semi-classical ensemble model, we studied the non-sequential double ionization by orthogonal two-color laser pulses. Our calculations show that the proportion of events experiencing multiple returnings, the sum of the final energies of two electrons, and the ion momentum distribution depend on the relative phase of the two-color fields, exhibiting oscillatory behavior with a period of π. Back analysis of these trajectories reveals that we can control the recollision energy of the electron by changing the relative phase of the two-color laser pulse. As a consequence, the trajectories of multiple-returning ions change with the relative phase, resulting in relative-phase-dependent ion momentum distributions. The result shows that the momentum distribution of the ions in the trajectories of multiple returnings is clearly wider than that for the case of single returning. For the multiple-returning events, the binary recollision leads to a smaller scattering angle of the first electron.]]></description>
      </item>
      </channel>
    </rss>