arXiv - PHYS - Atomic Physics最新文献

Photoionization of atoms and ions from endohedral anions 内面阴离子的原子和离子的光离子化

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-18 DOI: arxiv-2409.11670

V. K. Dolmatov, L. V. Chernysheva, V. G. Yarzhemsky

{"title":"Photoionization of atoms and ions from endohedral anions","authors":"V. K. Dolmatov, L. V. Chernysheva, V. G. Yarzhemsky","doi":"arxiv-2409.11670","DOIUrl":"https://doi.org/arxiv-2409.11670","url":null,"abstract":"We study the interconnection between the results of two qualitatively\u0000different approximate calculations of photoionization cross sections,\u0000$sigma_{nell}$, for neutral atoms ($A$) or their cations ($A^+$), centrally\u0000confined inside a fullerene-anion shell, $C_{N}^{q}$ , where $q$ represents the\u0000negative excess charge on the shell. One of the approximations, frequently\u0000employed in previous studies, assumes a uniform excess negative charge\u0000distribution over the entire fullerene shell, by analogy with a charged\u0000metallic sphere. The other approximation, not previously discussed in the\u0000literature, considers the quantum states of the excess electrons on the shell,\u0000determined by specific $n$ and $ell$ values of their quantum numbers.\u0000Remarkably, both methods yield photoionization cross sections for the\u0000encapsulated species that are close to each other. Consequently, we find that\u0000the photoionization of the encapsulated atoms or cations inside a $C_{N}^{q}$\u0000anion is minimally influenced by the quantum states of the excess electrons on\u0000the fullerene shell. Furthermore, we demonstrate that the aforementioned\u0000influence decreases even further with an increasing size of the confining\u0000fullerene shell. All this holds true at least under the assumption that the\u0000confined atom or cation is compact, i.e., its electron density remains\u0000primarily within itself rather than being drawn into the fullerene shell. This\u0000remarkable finding results from Hartree-Fock calculations combined with a\u0000popular modeling of the fullerene shell, where it is modeled by an attractive\u0000spherical annular potential.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265204","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

Doppler-free selective reflection spectroscopy of electric-quadrupole transitions 电四极跃迁的无多普勒选择性反射光谱学

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-18 DOI: arxiv-2409.12017

Eng Aik Chan, Syed Abdullah Aljunid, Athanasios Laliotis, David Wilkowski, Martial Ducloy

引用次数: 0

Proximity-Induced Topological Hall Effect in Fe-doped Monolayer WSe2 铁掺杂单层 WSe2 中近距离诱导的拓扑霍尔效应

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11222

Mengqi Fang, Siwei Chen, Chunli Tang, Zitao Tang, Min-Yeong Choi, Jae Hyuck Jang, Hee-Suk Chung, Maya Narayanan Nair, Wencan Jin, Eui-Hyeok Yang

{"title":"Proximity-Induced Topological Hall Effect in Fe-doped Monolayer WSe2","authors":"Mengqi Fang, Siwei Chen, Chunli Tang, Zitao Tang, Min-Yeong Choi, Jae Hyuck Jang, Hee-Suk Chung, Maya Narayanan Nair, Wencan Jin, Eui-Hyeok Yang","doi":"arxiv-2409.11222","DOIUrl":"https://doi.org/arxiv-2409.11222","url":null,"abstract":"The topological Hall effect (THE) has attracted great attention since it\u0000provides an important probe of the interaction between electron and topological\u0000spin textures. THE has been considered an experimental signature of the\u0000topological spin texture of skyrmions. While THE has been widely reported in\u0000chiral magnets, oxide heterostructures, and hybrid systems such as\u0000ferromagnet/heavy metal and ferromagnet/topological insulators, the study of\u0000monolayer structures is lacking, hindering the understanding of noncollinear\u0000spin textures at the atomically thin scale. Here, we show a discernible THE via\u0000proximity coupling of Fe-doped monolayer WSe2 (Fe:WSe2) synthesized using\u0000chemical vapor deposition on a Pt Hall bar. Multiple characterization methods\u0000were employed to demonstrate that Fe atoms substitutionally replace W atoms,\u0000making a two-dimensional (2D) van der Waals (vdW) dilute magnetic semiconductor\u0000(DMS) at room temperature. Distinct from the intrinsic anomalous Hall effect,\u0000we found the transverse Hall resistivity of Fe:WSe2 displaying two additional\u0000dip/peak features in the temperature-dependent measurements, consistent with\u0000the contribution of THE. The topological Hall effect is attributed to the\u0000magnetic skyrmions that emerge from the Dzyaloshinskii-Moriya interactions at\u0000the Fe:WSe2 and Pt interface. Our work shows that a DMS synthesized from 2D vdW\u0000transition metal dichalcogenides is promising for realizing magnetic skyrmions\u0000and spintronic applications.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265209","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

Quantitative comparison of TDDFT-calculated HHG yields in ring-shaped organic molecules 环形有机分子中 TDDFT 计算的 HHG 产量的定量比较

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11487

Stephanie N. Armond, Kyle A. Hamer, Ravi Bhardwaj, Francois Mauger, Kenneth Lopata, Kenneth J. Schafer, Mette B. Gaarde

{"title":"Quantitative comparison of TDDFT-calculated HHG yields in ring-shaped organic molecules","authors":"Stephanie N. Armond, Kyle A. Hamer, Ravi Bhardwaj, Francois Mauger, Kenneth Lopata, Kenneth J. Schafer, Mette B. Gaarde","doi":"arxiv-2409.11487","DOIUrl":"https://doi.org/arxiv-2409.11487","url":null,"abstract":"We compare the high-harmonic-generation (HHG) yield driven by a mid-infrared\u0000laser in three organic ring-shaped molecules, calculated using time-dependent\u0000density-functional theory (TDDFT). We average the yield over the relative\u0000orientation of the molecules and the linearly-polarized, 1825 nm driving laser\u0000pulse in order to compare to experimental spectra obtained by Alharbi et al.,\u0000Phys. Rev. A 92, 041801 (2015). We find that the raw TDDFT-calculated HHG yield\u0000in cyclohexane (CHA) is strongly overestimated compared to those of benzene and\u0000cyclohexene, and that this can be attributed to unphysically large\u0000contributions from CHA orbitals lying well below the highest-occupied molecular\u0000orbital. We show that implementing a simple orbital-resolved scaling factor,\u0000which corrects the yield of the tunneling ionization contribution to the first\u0000step in the HHG process, leads to much better comparisons with experimental\u0000results. Our results are encouraging for the use of TDDFT in systematic\u0000computations of HHG in large molecules.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265206","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

Temperature sensitivity of a Thorium-229 solid-state nuclear clock 钍-229 固态核钟的温度敏感性

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11590

Jacob S. Higgins, Tian Ooi, Jack F. Doyle, Chuankun Zhang, Jun Ye, Kjeld Beeks, Tomas Sikorsky, Thorsten Schumm

{"title":"Temperature sensitivity of a Thorium-229 solid-state nuclear clock","authors":"Jacob S. Higgins, Tian Ooi, Jack F. Doyle, Chuankun Zhang, Jun Ye, Kjeld Beeks, Tomas Sikorsky, Thorsten Schumm","doi":"arxiv-2409.11590","DOIUrl":"https://doi.org/arxiv-2409.11590","url":null,"abstract":"Quantum state-resolved spectroscopy of the low energy thorium-229 nuclear\u0000transition was recently achieved. The five allowed transitions within the\u0000electric quadrupole splitting structure were measured to the kilohertz level in\u0000a calcium fluoride host crystal, opening the field of nuclear-based optical\u0000clocks. Central to the performance of solid-state clock operation is an\u0000understanding of systematic shifts such as the temperature dependence of the\u0000clock transitions. In this work, we measure the four strongest transitions of\u0000thorium-229 in the same crystal at three temperature values: 150 K, 229 K, and\u0000293 K. We find shifts of the unsplit frequency and the electric quadrupole\u0000splittings, corresponding to decreases in the electron density, electric field\u0000gradient, and field gradient asymmetry at the nucleus as temperature increases.\u0000The $textit{m}$ = $pm 5/2 rightarrow pm 3/2$ line shifts only 62(6) kHz\u0000over the temperature range, i.e., approximately 0.4 kHz/K, representing a\u0000promising candidate for a future solid-state optical clock. Achieving\u000010$^{-18}$ precision requires crystal temperature stability of 5$mu$K.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265205","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

On the effect of "glancing" collisions in the cold atom vacuum standard 冷原子真空标准中 "闪烁 "碰撞的影响

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-17 DOI: arxiv-2409.11226

Stephen P. Eckel, Daniel S. Barker, James A. Fedchak, Jacek Kłos, Julia Scherschligt, Eite Tiesinga

{"title":"On the effect of \"glancing\" collisions in the cold atom vacuum standard","authors":"Stephen P. Eckel, Daniel S. Barker, James A. Fedchak, Jacek Kłos, Julia Scherschligt, Eite Tiesinga","doi":"arxiv-2409.11226","DOIUrl":"https://doi.org/arxiv-2409.11226","url":null,"abstract":"We theoretically investigate the effect of ``glancing\" collisions on the\u0000ultra-high vacuum (UHV) pressure readings of the cold atom vacuum standard\u0000(CAVS), based on either ultracold $^7$Li or $^{87}$Rb atoms. Here, glancing\u0000collisions are those collisions between ultracold atoms and room-temperature\u0000background atoms or molecules in the vacuum that do not impart enough kinetic\u0000energy to eject an ultracold atom from its trap. Our model is wholly\u0000probabilistic and shows that the number of the ultracold atoms remaining in the\u0000trap as a function of time is non-exponential. We update the recent results of\u0000a comparison between a traditional pressure standard -- a combined flowmeter\u0000and dynamic expansion system -- to the CAVS [D.S. Barker, et al.,\u0000arXiv:2302.12143] to reflect the results of our model. We find that the effect\u0000of glancing collisions shifts the theoretical predictions of the total loss\u0000rate coefficients for $^7$Li colliding with noble gases or N$_2$ by up to $0.6$\u0000%. Likewise, we find that in the limit of zero trap depth the experimentally\u0000extracted loss rate coefficients for $^{87}$Rb colliding with noble gases or\u0000N$_2$ shift by as much as 2.2 %.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265208","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

Dispersion of first sound in a weakly interacting ultracold Fermi liquid: an exact calculation 弱相互作用超冷费米液体中第一声的弥散：精确计算

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-16 DOI: arxiv-2409.10099

Thomas Repplinger, Songtao Huang, Yunpeng Ji, Nir Navon, Hadrien Kurkjian

{"title":"Dispersion of first sound in a weakly interacting ultracold Fermi liquid: an exact calculation","authors":"Thomas Repplinger, Songtao Huang, Yunpeng Ji, Nir Navon, Hadrien Kurkjian","doi":"arxiv-2409.10099","DOIUrl":"https://doi.org/arxiv-2409.10099","url":null,"abstract":"At low temperature, a normal gas of unpaired spin-1/2 fermions is one of the\u0000cleanest realizations of a Fermi liquid. It is described by Landau's theory,\u0000where no phenomenological parameters are needed as the quasiparticle\u0000interaction function can be computed perturbatively in powers of the scattering\u0000length $a$, the sole parameter of the short-range interparticle interactions.\u0000Obtaining an accurate solution of the transport equation nevertheless requires\u0000a careful treatment of the collision kernel, as the uncontrolled error made by\u0000the relaxation time approximations increases when the temperature $T$ drops\u0000below the Fermi temperature. Here, we study sound waves in the hydrodynamic\u0000regime up to second order in the Chapman-Enskog's expansion. We find that the\u0000frequency $omega_q$ of the sound wave is shifted above its linear depart as\u0000$omega_q=c_1 q(1+alpha q^2tau^2)$ where $c_1$ and $q$ are the speed and\u0000wavenumber of the wave and the typical collision time $tau$ scales as\u0000$1/a^2T^2$. Besides the shear viscosity, the coefficient $alpha$ is described\u0000by a single second-order collision time which we compute exactly from an\u0000analytical solution of the transport equation, resulting in a positive\u0000dispersion $alpha>0$. Our results suggest that ultracold atomic Fermi gases\u0000are an ideal experimental system for quantitative tests of second order\u0000hydrodynamics.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265211","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

Spectroscopy of electric dipole and quadrupole transitions in $^{224}$Ra$^+$ $^{224}$Ra$^+$ 中的电偶极子和四极子跃迁光谱学

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-15 DOI: arxiv-2409.09873

Spencer Kofford, Haoran Li, Robert Kwapisz, Roy A. Ready, Akshay Sawhney, Oi Chee Cheung, Mingyu Fan, Andrew M. Jayich

引用次数: 0

An accurate vector optically pumped magnetometer with microwave-driven Rabi frequency measurements 精确的矢量光泵磁强计，可进行微波驱动的拉比频率测量

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-15 DOI: arxiv-2409.09885

Christopher Kiehl, Thanmay S. Menon, Svenja Knappe, Tobias Thiele, Cindy A. Regal

{"title":"An accurate vector optically pumped magnetometer with microwave-driven Rabi frequency measurements","authors":"Christopher Kiehl, Thanmay S. Menon, Svenja Knappe, Tobias Thiele, Cindy A. Regal","doi":"arxiv-2409.09885","DOIUrl":"https://doi.org/arxiv-2409.09885","url":null,"abstract":"Robust calibration of vector optically pumped magnetometers (OPMs) is a\u0000nontrivial task, but increasingly important for applications requiring\u0000high-accuracy such as magnetic navigation, geophysics research, and space\u0000exploration. Here, we showcase a vector OPM that utilizes Rabi oscillations\u0000driven between the hyperfine manifolds of $^{87}$Rb to measure the direction of\u0000a DC magnetic field against the polarization ellipse structure of a microwave\u0000field. By relying solely on atomic measurements -- free-induction decay (FID)\u0000signals and Rabi measurements across multiple atomic transitions -- this sensor\u0000can detect drift in the microwave vector reference and compensate for\u0000systematic shifts caused by off-resonant driving, nonlinear Zeeman (NLZ)\u0000effects, and buffer gas collisions. To facilitate dead-zone-free operation, we\u0000also introduce a novel Rabi measurement that utilizes dressed-state resonances\u0000that appear during simultaneous Larmor precession and Rabi driving (SPaR).\u0000These measurements, performed within a microfabricated vapor cell platform,\u0000achieve an average vector accuracy of 0.46 mrad and vector sensitivities down\u0000to 11 $mu$rad$/sqrt{text{Hz}}$ for geomagnetic field strengths near 50\u0000$mu$T. This performance surpasses the challenging 1-degree (17 mrad) accuracy\u0000threshold of several contemporary OPM methods utilizing atomic vapors with an\u0000electromagnetic vector reference.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265217","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

Revised $^3$He nuclear charge radius due to electronic hyperfine mixing 因电子超细混合而修订的 $^3$He 核电荷半径

arXiv - PHYS - Atomic Physics Pub Date : 2024-09-14 DOI: arxiv-2409.09279

Xiao-Qiu Qi, Pei-Pei Zhang, Zong-Chao Yan, Li-Yan Tang, Ai-Xi Chen, Ting-Yun Shi, Zhen-Xiang Zhong

{"title":"Revised $^3$He nuclear charge radius due to electronic hyperfine mixing","authors":"Xiao-Qiu Qi, Pei-Pei Zhang, Zong-Chao Yan, Li-Yan Tang, Ai-Xi Chen, Ting-Yun Shi, Zhen-Xiang Zhong","doi":"arxiv-2409.09279","DOIUrl":"https://doi.org/arxiv-2409.09279","url":null,"abstract":"The significant discrepancy in the difference of squared nuclear charge radii\u0000$Delta R^2$ of $^{3,4}$He obtained from electronic-atom or muonic-atom energy\u0000levels is a puzzle. In this paper, we show that the tension is resolved by\u0000including off-diagonal mixing effects due to the hyperfine interaction. Our\u0000findings indicate that the hyperfine mixing effect from the $n,^3!S$ and\u0000$n,^1!S$ states ($n>2$) of $^3$He leads to a $-1.37$ kHz adjustment in the\u0000isotope shift of the $2,^1!S-2,^3!S$ transition, surpassing the current\u0000uncertainty by a factor of $7$. This results in a change of $-0.0064~rm{fm}^2$\u0000in $Delta R^2$, shifting from $1.0757(15)~mathrm{fm}^2$ to\u0000$1.0693(15)~mathrm{fm}^2$ as determined by Werf {it et al.}, significantly\u0000reducing the discrepancy with the value of $1.0636(31)~mathrm{fm}^2$\u0000determined by $murm{He}^+$, and aligning with the result of $1.069(3)$\u0000$mathrm{fm}^2$ obtained from the $2,^3!S-2,^3!P$ transition. This\u0000adjustment will result in a noticeable change in the absolute nuclear charge\u0000radius of $^{3}$He by $-0.0017~rm{fm}$, aligning the revised value of\u0000$1.9715(11)~mathrm{fm}$ with the value of $1.97007(94)~mathrm{fm}$ determined\u0000by $mu^3rm{He}^+$ within $1sigma$. Our results offer crucial insights into\u0000resolving discrepancy in $Delta R^2$ for $^{3,4}$He and determining the charge\u0000radius of $^3$He.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142265210","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