arXiv - PHYS - Atomic Physics最新文献_第3页

Magneto-optical trapping of a heavy polyatomic molecule for precision measurement 用于精确测量的多原子重分子磁光捕获技术

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-08 DOI: arxiv-2409.04948

Zack D. Lasner, Alexander Frenett, Hiromitsu Sawaoka, Loic Anderegg, Benjamin Augenbraun, Hana Lampson, Mingda Li, Annika Lunstad, Jack Mango, Abdullah Nasir, Tasuku Ono, Takashi Sakamoto, John M. Doyle

引用次数: 0

Quantum error correction of motional dephasing using optical dressing 利用光学敷料对运动去相进行量子纠错

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-07 DOI: arxiv-2409.04769

Yuechun Jiao, Changcheng Li, Jiabei Fan, Jingxu Bai, XiaoFeng Shi, Suotang Jia, Jianming Zhao, C. Stuart Adams

引用次数: 0

Quasi-analytical lineshape for the 1S-2S laser spectroscopy of antihydrogen and hydrogen 反氢和氢的 1S-2S 激光光谱准分析线形

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-06 DOI: arxiv-2409.04509

Levi Oliveira de Araujo Azevedo, Claudio Lenz Cesar

{"title":"Quasi-analytical lineshape for the 1S-2S laser spectroscopy of antihydrogen and hydrogen","authors":"Levi Oliveira de Araujo Azevedo, Claudio Lenz Cesar","doi":"arxiv-2409.04509","DOIUrl":"https://doi.org/arxiv-2409.04509","url":null,"abstract":"The accuracy of high precision and fundamental measurements of atomic\u0000transition frequencies via laser spectroscopy depends upon fitting the spectral\u0000data with a lineshape. With atomic hydrogen and antihydrogen 1S-2S two-photon\u0000spectroscopy, computer intensive Monte-Carlo simulations have been used to\u0000compute the optical Bloch equations in order to match and interpret the\u0000experimental spectra. For the highest resolutions, one tries to minimize\u0000saturation effects going to regimes of low excitation probability, where\u0000perturbation theory can provide reliable results. Here we describe an\u0000analytical approach to the lineshape based on perturbation theory accounting\u0000for the AC-Stark shift and ionization. The expressions can be used for beam\u0000experiments or integrated over the magnetic field profile for a trapped sample.\u0000Theses lineshapes, providing fast results, allow for studies of many systematic\u0000effects that influence the accuracy of the determination of the central\u0000frequency. This development has relevance to hydrogen beam experiments and to\u0000trapped hydrogen and antihydrogen, as developed by the ALPHA collaboration at\u0000CERN, for tests of the CPT-symmetry and the highest accuracy measurement on\u0000antimatter.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ab initio quantum dynamics as a scalable solution to the exoplanet opacity challenge: A case study of CO$_2$ in hydrogen atmosphere 作为系外行星不透明度挑战的可扩展解决方案的 Ab initio 量子动力学：氢大气中 CO$_2$ 的案例研究

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-06 DOI: arxiv-2409.04439

Laurent Wiesenfeld, Prajwal Niraula, Julien de Wit, Nejmeddine Jaïdane, Iouli E. Gordon, Robert J. Hargreaves

{"title":"Ab initio quantum dynamics as a scalable solution to the exoplanet opacity challenge: A case study of CO$_2$ in hydrogen atmosphere","authors":"Laurent Wiesenfeld, Prajwal Niraula, Julien de Wit, Nejmeddine Jaïdane, Iouli E. Gordon, Robert J. Hargreaves","doi":"arxiv-2409.04439","DOIUrl":"https://doi.org/arxiv-2409.04439","url":null,"abstract":"Light-matter interactions lie at the heart of our exploration of exoplanetary\u0000atmospheres. Interpreting data obtained by remote sensing is enabled by\u0000meticulous, time- and resource-consuming work aiming at deepening our\u0000understanding of such interactions (i.e., opacity models). Recently,\u0000citet{Niraula2022} pointed out that due primarily to limitations on our\u0000modeling of broadening and far-wing behaviors, opacity models needed a timely\u0000update for exoplanet exploration in the JWST era, and thus argued for a\u0000scalable approach. In this Letter, we introduce an end-to-end solution from ab\u0000initio calculations to pressure broadening, and use the perturbation framework\u0000to identify the need for precision to a level of $sim$10%. We focus on the\u0000CO$_2$-H$_2$ system as CO$_2$ presents a key absorption feature for exoplanet\u0000research (primarily driven by the observation of gas giants) at $sim$4.3$mu$m\u0000and yet severely lack opacity data. We compute elastic and inelastic\u0000cross-sections for the collision of {ortho-}H$_2$ ~with CO$_2$, in the ground\u0000vibrational state, and at the coupled-channel fully converged level. For\u0000scattering energies above $sim$20~cm$^{-1}$, moderate precision\u0000inter-molecular potentials are indistinguishable from high precision ones in\u0000cross-sections. Our calculations agree with the currently available measurement\u0000within 7%, i.e., well beyond the precision requirements. Our proof-of-concept\u0000introduces a computationally affordable way to compute full-dimensional\u0000interaction potentials and scattering quantum dynamics with a precision\u0000sufficient to reduce the model-limited biases originating from the pressure\u0000broadening and thus support instrument-limited science with JWST and future\u0000missions.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shapiro steps in strongly-interacting Fermi gases 强相互作用费米气体中的夏皮罗阶跃

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-05 DOI: arxiv-2409.03448

Giulia Del Pace, Diego Hernández-Rajkov, Vijay Pal Singh, Nicola Grani, Marcia Frómeta Fernández, Giulio Nesti, Jorge Amin Seman, Massimo Inguscio, Luigi Amico, Giacomo Roati

{"title":"Shapiro steps in strongly-interacting Fermi gases","authors":"Giulia Del Pace, Diego Hernández-Rajkov, Vijay Pal Singh, Nicola Grani, Marcia Frómeta Fernández, Giulio Nesti, Jorge Amin Seman, Massimo Inguscio, Luigi Amico, Giacomo Roati","doi":"arxiv-2409.03448","DOIUrl":"https://doi.org/arxiv-2409.03448","url":null,"abstract":"We report the observation of Shapiro steps in a periodically driven Josephson\u0000junction between strongly-interacting Fermi superfluids of ultracold atoms. We\u0000observe quantized plateaus in the current-potential characteristics, the height\u0000and width of which mirror the external drive frequency and the junction\u0000nonlinear response. Direct measurements of the current-phase relationship\u0000showcase how Shapiro steps arise from the synchronization between the relative\u0000phase of the two reservoirs and the external drive. Such mechanism is further\u0000supported by the detection of periodic phase-slippage processes, in the form of\u0000vortex-antivortex pairs. Our results are corroborated by a circuital model and\u0000numerical simulations, overall providing a clear understanding of Shapiro\u0000dynamics in atomic Fermi superfluids. Our work demonstrates phase-coherent and\u0000synchronization effects in driven strongly-interacting superfluids, opening\u0000prospects for studying emergent non-equilibrium dynamics in quantum many-body\u0000systems under external drives.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"2016 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoelectron -- residual-ion entanglement in streaked shake-up ionization of helium 氦的条纹振荡电离中的光电子-残余离子纠缠

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-05 DOI: arxiv-2409.03622

Hongyu Shi, Uwe Thumm

{"title":"Photoelectron -- residual-ion entanglement in streaked shake-up ionization of helium","authors":"Hongyu Shi, Uwe Thumm","doi":"arxiv-2409.03622","DOIUrl":"https://doi.org/arxiv-2409.03622","url":null,"abstract":"Streaked photoelectron emission spectra access the correlated dynamics of\u0000photoelectrons and residual target electrons with attosecond temporal\u0000resolution. We calculated ab initio single-ionization spectra for photoemission\u0000from helium atoms by co-linearly polarized ultrashort XUV and assisting\u0000few-femtosecond IR pulses. Distinguishing direct and shake-up ionization\u0000resulting in ground-state and excited (n=2,3) He+ residual ions, respectively,\u0000we examined the effects of the correlated photoemission dynamics on the\u0000photoelectron phase-accumulation as a function of the observable photoelectron\u0000detection direction and kinetic energy, and XUV-IR pulse delay. We tracked the\u0000dynamical evolution of the residual ion in relative streaked photoemission\u0000delays and found dominant contributions for shake-up emission from the residual\u0000ion - photoelectron interaction. These are in very good and fair agreement,\u0000respectively, for n=2 and n=3 shake-up photoemission along the\u0000pulse-polarization directions, with previous experimental and theoretical\u0000investigations [Ossiander et. al. 2017] and reveal a strong\u0000photoemission-direction dependence for shake-up ionization due to the coupling\u0000between the photoelectron and evolving residual-ion charge distribution in the\u0000IR-laser field.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Signatures of Linearized Gravity in Atom Interferometers: a Simplified Computational Framework 原子干涉仪中的线性引力特征：简化计算框架

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-05 DOI: arxiv-2409.03828

Leonardo Badurina, Yufeng Du, Vincent S. H. Lee, Yikun Wang, Kathryn M. Zurek

{"title":"Signatures of Linearized Gravity in Atom Interferometers: a Simplified Computational Framework","authors":"Leonardo Badurina, Yufeng Du, Vincent S. H. Lee, Yikun Wang, Kathryn M. Zurek","doi":"arxiv-2409.03828","DOIUrl":"https://doi.org/arxiv-2409.03828","url":null,"abstract":"We develop a general framework for calculating the leading-order,\u0000fully-relativistic contributions to the gravitational phase shift in\u0000single-photon atom interferometers within the context of linearized gravity. We\u0000show that the atom gradiometer observable, which only depends on the atom\u0000interferometer propagation phase, can be written in terms of three distinct\u0000contributions: the Doppler phase shift, which accounts for the tidal\u0000displacement of atoms along the baseline, the Shapiro phase shift, which\u0000accounts for the delay in the arrival time of photons at atom-light interaction\u0000points, and the Einstein phase shift, which accounts for the gravitational\u0000redshift measured by the atoms. For specific atom gradiometer configurations,\u0000we derive the signal and response functions for two physically-motivated\u0000scenarios: ($i$) transient gravitational waves in the transverse-traceless\u0000gauge and, for the first time, in the proper detector frame, and ($ii$)\u0000transient massive objects sourcing weak and slow-varying Newtonian potentials.\u0000We find that the Doppler contribution of realistic Newtonian noise sources\u0000($e.g.$, a freight truck or a piece of space debris) at proposed atom\u0000gradiometer experiments, such as AION, MAGIS and AEDGE, can exceed the shot\u0000noise level and thus affect physics searches if not properly subtracted.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Second-order hyperfine structure in strontium and impact on new physics searches using isotope shift spectroscopy 锶的二阶超正弦结构及其对利用同位素位移光谱搜索新物理学的影响

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-03 DOI: arxiv-2409.01530

Julian C. Berengut, Natalia S. Oreshkina

引用次数: 0

Achieving ultra-high anisotropy in thermal conductivity of plastic crystal through megapascal pressure of hot pressing 通过兆帕压力热压实现塑料晶体热导率的超高各向异性

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-03 DOI: arxiv-2409.01846

Zhipeng Wu, Mingzhi Fan, Yangjun Qin, Guangzu Zhang, Nuo Yang

{"title":"Achieving ultra-high anisotropy in thermal conductivity of plastic crystal through megapascal pressure of hot pressing","authors":"Zhipeng Wu, Mingzhi Fan, Yangjun Qin, Guangzu Zhang, Nuo Yang","doi":"arxiv-2409.01846","DOIUrl":"https://doi.org/arxiv-2409.01846","url":null,"abstract":"Plastic crystals, owing to their exceptional properties, are gradually\u0000finding applications in solid-state refrigeration and ferroelectric fields.\u0000However, their inherently low thermal conductivity restricts their utilization\u0000in electronic devices. This study demonstrates that applying megapascal\u0000pressure of hot pressing can enhance the thermal conductivity of plastic\u0000crystal films. Most importantly, it induces significant anisotropy in thermal\u0000conductivity. Such anisotropy in thermal conductivity is beneficial for\u0000specialized thermal management applications, such as directing heat flow paths\u0000in electronic devices. In this study, [(CH3)4N][FeCl4] PCs films were prepared\u0000by hot pressing. At a pressure of 16 MPa, the ratio of in-plane to cross-plane\u0000thermal conductivity in the film reaches a remarkable 5.5. This is attributed\u0000to the preferential orientation along the (002) crystal plane induced by\u0000uniaxial pressure, leading to the formation of a layered structure and the\u0000creation of a flat and dense film. Furthermore, according to molecular dynamics\u0000simulations, the thermal conductivity along the [100] and [010] directions\u0000(parallel to the (002) crystal plane) is higher than in other directions.\u0000Therefore, significant modulation of anisotropy in thermal conductivity is\u0000achieved in [(CH3)4N][FeCl4] films by applying uniaxial hot pressing pressure.\u0000This phenomenon has the potential to greatly broaden the application of plastic\u0000crystals in the field of flexible electronic devices.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An extrapolation method for polarizability assessments of ion-based optical clocks 离子光学钟偏振性评估的外推法

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-02 DOI: arxiv-2409.01476

K. J. Arnold, M. D. Barrett

引用次数: 0