Journal of Physics B: Atomic, Molecular and Optical Physics最新文献_第9页

Entanglement dynamics of two non-Hermitian qubits 两个非赫米提质子的纠缠动力学

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-26 DOI: 10.1088/1361-6455/ad34a0

Yi-Xi Zhang, Zhen-Tao Zhang, Xiao-Zhi Wei, Bao-Long Liang, Feng Mei, Zhen-Shan Yang

引用次数: 0

Derivation of Miller's rule for the nonlinear optical susceptibility of a quantum anharmonic oscillator 量子非谐振子非线性光学感度的米勒规则推导

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-21 DOI: 10.1088/1361-6455/ad369c

Maximilian Tim Meyer, A. Schindlmayr

{"title":"Derivation of Miller's rule for the nonlinear optical susceptibility of a quantum anharmonic oscillator","authors":"Maximilian Tim Meyer, A. Schindlmayr","doi":"10.1088/1361-6455/ad369c","DOIUrl":"https://doi.org/10.1088/1361-6455/ad369c","url":null,"abstract":"\u0000 Miller's rule is an empirical relation between the nonlinear and linear optical coefficients that applies to a large class of materials but has only been rigorously derived for the classical Lorentz model with a weak anharmonic perturbation. In this work, we extend the proof and present a detailed derivation of Miller's rule for an equivalent quantum-mechanical anharmonic oscillator. For this purpose, the classical concept of velocity-dependent damping inherent to the Lorentz model is replaced by an adiabatic switch-on of the external electric field, which allows a unified treatment of the classical and quantum-mechanical systems using identical potentials and fields. Although the dynamics of the resulting charge oscillations, and hence the induced polarizations, deviate due to the finite zero-point motion in the quantum-mechanical framework, we find that Miller's rule is nevertheless identical in both cases up to terms of first order in the anharmonicity. With a view to practical applications, especially in the context of ab initio calculations for the optical response where adiabatically switched-on fields are widely assumed, we demonstrate that a correct treatment of finite broadening parameters is essential to avoid spurious errors that may falsely suggest a violation of Miller's rule, and we illustrate this point by means of a numerical example.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140223587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced positron acceleration driven by femto-second laser pulses irradiating structured targets 飞秒激光脉冲照射结构化目标所驱动的增强型正电子加速度

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-21 DOI: 10.1088/1361-6455/ad31b1

S Chintalwad, S Krishnamurthy, S Ghosh, C P Ridgers, B Ramakrishna

{"title":"Enhanced positron acceleration driven by femto-second laser pulses irradiating structured targets","authors":"S Chintalwad, S Krishnamurthy, S Ghosh, C P Ridgers, B Ramakrishna","doi":"10.1088/1361-6455/ad31b1","DOIUrl":"https://doi.org/10.1088/1361-6455/ad31b1","url":null,"abstract":"We have proposed a compact scheme for generating high-density and high-energy positrons by irradiating different shaped targets with an ultra-intense laser pulse, using 2D particle-in-cell simulations and numerical analysis. Our simulations show that the Breit–Wheeler process dominates positron production during laser-target interaction when a laser with an intensity of <inline-formula>\u0000<tex-math><?CDATA $4 times 10^{23}~mathrm{W,cm}^{-2}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mn>23</mml:mn></mml:mrow></mml:msup><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi mathvariant=\"normal\">W</mml:mi><mml:mstyle scriptlevel=\"0\"></mml:mstyle><mml:mi>cm</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"bad31b1ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> is used. We obtain a positron beam with an energy of 2.5 GeV and a total number exceeding 109, which is an improvement by two orders of magnitude compared to previous work with the same laser intensity. By using different shaped targets, we are able to generate a high-energy positron beam with low divergence. The yield of positron pairs depends on both the target and the laser parameters, and we have investigated how the shape of the target can enhance pair production and reduce divergence. Both of our analytical and simulation results demonstrate that this high-flux and low-divergence positron beam has direct applications in the field of medical and astro-physics that can be explored in the upcoming high intensity laser facilities.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Generation of interferometrically stable pulse pairs from a free-electron laser using a birefringent interferometer 利用双折射干涉仪从自由电子激光器中产生干涉测量稳定脉冲对

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-20 DOI: 10.1088/1361-6455/ad2e2d

B Ardini, F Richter, L Uboldi, P Cinquegrana, M Danailov, A Demidovich, S D Ganeshamandiram, S Hartweg, G Kurdi, F Landmesser, M Michelbach, A Ngai, I Nikolov, N Rendler, F Stienkemeier, D Uhl, L Bruder, G Cerullo, C Manzoni

引用次数: 0

Imagining density distribution of molecular orbitals in IR+XUV co-rotating circular laser fields by frequency-domain theory 用频域理论想象红外+紫外共旋转圆形激光场中分子轨道的密度分布

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-20 DOI: 10.1088/1361-6455/ad31b0

Yu-Hong Li, Facheng Jin, Yujun Yang, Fei Li, Ying-Chun Guo, Zhi-Yi Wei, Jing Chen, Xiaojun Liu, Bingbing Wang

{"title":"Imagining density distribution of molecular orbitals in IR+XUV co-rotating circular laser fields by frequency-domain theory","authors":"Yu-Hong Li, Facheng Jin, Yujun Yang, Fei Li, Ying-Chun Guo, Zhi-Yi Wei, Jing Chen, Xiaojun Liu, Bingbing Wang","doi":"10.1088/1361-6455/ad31b0","DOIUrl":"https://doi.org/10.1088/1361-6455/ad31b0","url":null,"abstract":"We have investigated the angle-resolved ATI spectrum of oriented molecules in the IR+XUV co-rotating circular laser fields. According to the different roles of IR and XUV laser in the ionization process, we purposefully adjust the photon energy of XUV and the intensity of IR laser to make the ionization spectrum of the molecule distributed in a suitable momentum region. Moreover, under the same laser conditions, the background fringes in the ionization spectrum of the molecule can be removed by using the ionization spectrum of the atom with the same ionization energy as the molecule, so that the molecular orbital density distribution in the suitable momentum region can be obtained. That is, for any unknown molecule, as long as the ionization energy of the molecule can be measured, the density distribution of the molecular orbital can be imaged in a definite momentum region by adjusting the laser field conditions, which may shed light on the experimental detection of molecular orbitals.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation transfer spectroscopy of the D1 transition of potassium: theory and experiment 钾 D1 转变的调制传递光谱学：理论与实验

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-20 DOI: 10.1088/1361-6455/ad31af

A D Innes, P Majumder, H R Noh, S L Cornish

{"title":"Modulation transfer spectroscopy of the D1 transition of potassium: theory and experiment","authors":"A D Innes, P Majumder, H R Noh, S L Cornish","doi":"10.1088/1361-6455/ad31af","DOIUrl":"https://doi.org/10.1088/1361-6455/ad31af","url":null,"abstract":"We report on a study of modulation transfer spectroscopy of the <inline-formula>\u0000<tex-math><?CDATA $4textrm{S}_{1/2}rightarrow 4textrm{P}_{1/2}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mn>4</mml:mn><mml:msub><mml:mtext>S</mml:mtext><mml:mrow><mml:mn>1</mml:mn><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mo stretchy=\"false\">→</mml:mo><mml:mn>4</mml:mn><mml:msub><mml:mtext>P</mml:mtext><mml:mrow><mml:mn>1</mml:mn><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"bad31afieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> (D1) transition of naturally abundant potassium in a room-temperature vapour cell. This transition is critical for laser cooling and optical pumping of potassium and our study is therefore motivated by the need for robust laser frequency stabilisation. Despite the absence of a closed transition, the small ground-state hyperfine splitting in potassium results in strong crossover features in the D1 modulation transfer spectrum. To emphasise this we compare the D1 and D2 spectra of potassium with those of rubidium. Further, we compare our experimental results with a detailed theoretical simulation, examining different pump–probe polarisation configurations to identify the optimal signals for laser frequency stabilisation. We find good agreement between the experiment and the theory, especially for the <inline-formula>\u0000<tex-math><?CDATA $textrm{lin} parallel textrm{lin}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mtext>lin</mml:mtext><mml:mo>∥</mml:mo><mml:mtext>lin</mml:mtext></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"bad31afieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> polarisation configuration.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum optics in MATLAB MATLAB 中的量子光学

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-18 DOI: 10.1088/1361-6455/ad2e2f

Nilakantha Meher

引用次数: 0

Charge exchange of slow highly charged ions from an electron beam ion trap with surfaces and 2D materials 来自电子束离子阱的慢速高电荷离子与表面和二维材料的电荷交换

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-18 DOI: 10.1088/1361-6455/ad2e2a

A Niggas, M Werl, F Aumayr, R A Wilhelm

引用次数: 0

Cavity output field nonreciprocal control via interference effects 通过干扰效应实现腔体输出场非互易控制

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-15 DOI: 10.1088/1361-6455/ad34a1

Yang Zhang, Yu-bo Ma, Hongyi Zhu, Chang-shui Yu

引用次数: 0

Interference effects in Compton scattering of keV photons at H+2 : a nonrelativistic analytical approach H+2 处 keV 光子康普顿散射的干涉效应：非相对论分析方法

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-15 DOI: 10.1088/1361-6455/ad34a3

M. Dieng, H. Bachau

引用次数: 0