arXiv - PHYS - Atomic Physics最新文献_第6页

Reconfigurable circular polarization medium frequency atomic receiver using magneto-electric effect 利用磁电效应的可重构圆极化中频原子接收器

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-19 DOI: arxiv-2408.10398

Sujit GarainSchool of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, IndiaHomi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, India, Surya Narayan SahooSchool of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, IndiaHomi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, India, Ashok K MohapatraSchool of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, IndiaHomi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, India

{"title":"Reconfigurable circular polarization medium frequency atomic receiver using magneto-electric effect","authors":"Sujit GarainSchool of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, IndiaHomi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, India, Surya Narayan SahooSchool of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, IndiaHomi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, India, Ashok K MohapatraSchool of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, IndiaHomi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, India","doi":"arxiv-2408.10398","DOIUrl":"https://doi.org/arxiv-2408.10398","url":null,"abstract":"Nonlinear magnetoelectric effect(NME) in alkali atomic vapor has applications\u0000in precision magnetometry in the radio-frequency domain. We report the\u0000application of the NME in alkali atomic vapors for projective measurement of\u0000medium-frequency (MF) magnetic fields in a circular basis with an extinction\u0000ratio up to 500:1 . Utilizing a longitudinal static magnetic field, we\u0000demonstrate a high-sensitivity technique for characterizing the ellipticity of\u0000radio-frequency (RF) magnetic fields which can in turn be used for phase\u0000sensitive detection in mid frequency communication. Additionally, we\u0000demonstrate the conversion of binary phase shift keyed RF magnetic fields into\u0000amplitude modulation of generated optical fields, a versatile receiver for\u0000communication using the medium frequency band.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176431","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

Low frequency communication based on Rydberg-atom receiver 基于雷德伯格原子接收器的低频通信

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-19 DOI: arxiv-2408.09681

Yipeng Xie, Mingwei Lei, Meng Shi

{"title":"Low frequency communication based on Rydberg-atom receiver","authors":"Yipeng Xie, Mingwei Lei, Meng Shi","doi":"arxiv-2408.09681","DOIUrl":"https://doi.org/arxiv-2408.09681","url":null,"abstract":"Low frequency communication has a wide range of applications in the fields of\u0000satellite detection, underground mining, disaster relief. Rydberg atom sensor\u0000has rapidly developed in recent years, capitalizing on its calibration-free\u0000SI-traceability, large polarizabilities and transition dipole moments. A\u0000Rydberg atom sensor is capable of sensitively detecting electric field signals\u0000from DC to THz. In this work, we demonstrate low frequency communication using\u0000Rydberg atoms in a vapor cell with two parallel electrode plates inside. Three\u0000modulations, BPSK, OOK, and 2FSK, are used for the communication by Rydberg\u0000atom receiver near 100kHz. We have measured the SNR of the modulated low\u0000frequency signal received by Rydberg atoms at various emission voltages.\u0000Meanwhile, we have demonstrated IQ constellation diagram, EVM and eye diagram\u0000of the demodulated signal at different symbol rate. The EVM is measured to be\u00008.8% when the symbol rate is 2Kbps, 9.4% when the symbol rate is 4Kbps, and\u000013.7% when the symbol rate is 8Kbps. The high-fidelity digital color image\u0000transmission resulted in a peak signal-to-noise ratio of 70dB. This study\u0000proves that Rydberg-atom receiver can finely work in low frequency\u0000communication.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176432","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

Stopping of very heavy ions in Mylar 阻止迈拉尔中的超重离子

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-19 DOI: arxiv-2408.10065

R. N. Sagaidak

引用次数: 0

Application of the Variational R-matrix Method for the Dirac Equation to the Be Atom 将狄拉克方程的 R 矩阵变量法应用于 Be 原子

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-18 DOI: arxiv-2408.09329

Chris H. Greene, Miguel A. Alarcón

引用次数: 0

Universal trimers with p-wave interactions and the faux-Efimov effect 具有 p 波相互作用的通用三聚体和假埃菲莫夫效应

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-16 DOI: arxiv-2408.08993

Yu-Hsin Chen, Chris H Greene

{"title":"Universal trimers with p-wave interactions and the faux-Efimov effect","authors":"Yu-Hsin Chen, Chris H Greene","doi":"arxiv-2408.08993","DOIUrl":"https://doi.org/arxiv-2408.08993","url":null,"abstract":"An unusual class of $p$-wave universal trimers with symmetry\u0000$L^{Pi}=1^{pm}$ is identified, for both a two-component fermionic trimer with\u0000$s$- and $p$-wave scattering length close to unitarity and for a one-component\u0000fermionic trimer at $p$-wave unitarity. Moreover, fermionic trimers made of\u0000atoms with two internal spin components are found for $L^{Pi}=1^{pm}$, when\u0000the $p$-wave interaction between spin-up and spin-down fermions is close to\u0000unitarity and/or when the interaction between two spin-up fermions is close to\u0000the $p$-wave unitary limit. The universality of these $p$-wave universal\u0000trimers is tested here by considering van der Waals interactions in a\u0000Lennard-Jones potential with different numbers of two-body bound states; our\u0000calculations also determine the value of the scattering volume or length where\u0000the trimer state hits zero energy and can be observed as a recombination\u0000resonance. The faux-Efimov effect appears with trimer symmetry $L^{Pi}=1^{-}$\u0000when the two fermion interactions are close to $p$-wave unitarity and the\u0000lowest $1/R^2$ coefficient gets modified, thereby altering the usual Wigner\u0000threshold law for inelastic processes involving 3-body continuum channels.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176434","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

Laser-cooling Cadmium Bosons and Fermions with Near Ultraviolet Triplet Excitations 利用近紫外三重激发激光冷却镉玻色子和费米子

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-15 DOI: arxiv-2408.08424

Kurt Gibble

引用次数: 0

Low Thermal Resistance of Diamond-AlGaN Interfaces Achieved Using Carbide Interlayers 使用碳化物夹层实现金刚石-氮化镓界面的低热阻

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-15 DOI: arxiv-2408.08076

Henry T. Aller, Thomas W. Pfeifer, Abdullah Mamun, Kenny Huynh, Marko Tadjer, Tatyana Feygelson, Karl Hobart, Travis Anderson, Bradford Pate, Alan Jacobs, James Spencer Lundh, Mark Goorsky, Asif Khan, Patrick Hopkins, Samuel Graham

{"title":"Low Thermal Resistance of Diamond-AlGaN Interfaces Achieved Using Carbide Interlayers","authors":"Henry T. Aller, Thomas W. Pfeifer, Abdullah Mamun, Kenny Huynh, Marko Tadjer, Tatyana Feygelson, Karl Hobart, Travis Anderson, Bradford Pate, Alan Jacobs, James Spencer Lundh, Mark Goorsky, Asif Khan, Patrick Hopkins, Samuel Graham","doi":"arxiv-2408.08076","DOIUrl":"https://doi.org/arxiv-2408.08076","url":null,"abstract":"This study investigates thermal transport across nanocrystalline\u0000diamond/AlGaN interfaces, crucial for enhancing thermal management in\u0000AlGaN/AlGaN-based devices. Chemical vapor deposition growth of diamond directly\u0000on AlGaN resulted in a disordered interface with a high thermal boundary\u0000resistance (TBR) of 20.6 m^2-K/GW. We employed sputtered carbide interlayers\u0000(e.g., $B_4C$, $SiC$, $B_4C/SiC$) to reduce thermal boundary resistance in\u0000diamond/AlGaN interfaces. The carbide interlayers resulted in record-low\u0000thermal boundary resistance values of 3.4 and 3.7 m^2-K/GW for\u0000Al$_{0.65}$Ga$_{0.35}$N samples with $B_4C$ and $SiC$ interlayers,\u0000respectively. STEM imaging of the interface reveals interlayer thicknesses\u0000between 1.7-2.5 nm, with an amorphous structure. Additionally, Fast-Fourier\u0000Transform (FFT) characterization of sections of the STEM images displayed sharp\u0000crystalline fringes in the AlGaN layer, confirming it was properly protected\u0000from damage from hydrogen plasma during the diamond growth. In order to\u0000accurately measure the thermal boundary resistance we develop a hybrid\u0000technique, combining time-domain thermoreflectance and steady-state\u0000thermoreflectance fitting, offering superior sensitivity to buried thermal\u0000resistances. Our findings underscore the efficacy of interlayer engineering in\u0000enhancing thermal transport and demonstrate the importance of innovative\u0000measurement techniques in accurately characterizing complex thermal interfaces.\u0000This study provides a foundation for future research in improving thermal\u0000properties of semiconductor devices through interface engineering and advanced\u0000measurement methodologies.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176438","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

Spectrum and energy levels of the high-lying singly excited configurations of Nd III 钕Ⅲ高位单激发构型的光谱和能级

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-14 DOI: arxiv-2408.07830

M. Ding, A. N. Ryabtsev, E. Y. Kononov, T. Ryabchikova, J. C. Pickering

{"title":"Spectrum and energy levels of the high-lying singly excited configurations of Nd III","authors":"M. Ding, A. N. Ryabtsev, E. Y. Kononov, T. Ryabchikova, J. C. Pickering","doi":"arxiv-2408.07830","DOIUrl":"https://doi.org/arxiv-2408.07830","url":null,"abstract":"Fourier transform spectra of Nd Penning and hollow cathode discharge lamps\u0000were recorded within the region 32,500-54,000 cm$^{-1}$ (3077-1852 {AA}) and\u0000grating spectra of Nd vacuum sliding sparks were recorded within the regions\u0000820-1159 {AA} and 1600-3250 {AA}. New energy levels were found using the\u0000observed wavelengths measured accurate to a few parts in $10^8$ in Fourier\u0000transform spectra and to a few parts in $10^7$ in grating spectra. Atomic\u0000structure and transition probability calculations of Nd III were made using the\u0000Cowan codes by adjusting energy parameters to fit all known Nd III levels.\u0000Nd-rich stellar spectra were also used to evaluate the new calculations. In\u0000total, 355 transitions were classified from observed spectra involving 116\u0000previously experimentally unknown energy levels of the 4f$^3$7s, 4f$^3$6d, and\u00004f$^3$5f configurations of Nd III, all reported here for the first time. One\u0000newly identified level of the 4f$^3$5d configuration is also reported. Typical\u0000level energy uncertainties are 0.01 cm$^{-1}$ for the 4f$^3$7s and 4f$^3$6d\u0000levels and 0.3 cm$^{-1}$ for the 4f$^3$5f levels. In addition, calculated\u0000energy levels up to 130,936 cm$^{-1}$ are presented, including eigenvector\u0000composition and calculated level lifetimes. Calculated transition probabilities\u0000and wavelengths between 1900-50,000 {AA} are also presented. Using newly\u0000established levels of the 4f$^3$7s configuration and the recently established\u0000levels of the 4f$^3$6s configuration, the ionisation energy of Nd III was\u0000estimated at $178,090pm330$ cm$^{-1}$, doubling the accuracy of the previously\u0000published value.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176437","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

Laboratory confirmation and improved Accuracy of 4f and 5d energy levels of Fe II previously identified from stellar spectra 实验室确认并提高先前从恒星光谱中确定的 Fe II 的 4f 和 5d 能级的准确性

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-14 DOI: arxiv-2408.07833

M. Ding, H. Kozuki, F. Concepcion, G. Nave, J. C. Pickering

{"title":"Laboratory confirmation and improved Accuracy of 4f and 5d energy levels of Fe II previously identified from stellar spectra","authors":"M. Ding, H. Kozuki, F. Concepcion, G. Nave, J. C. Pickering","doi":"arxiv-2408.07833","DOIUrl":"https://doi.org/arxiv-2408.07833","url":null,"abstract":"Many energy levels of singly ionised iron (Fe II, $Z=26$) remain uncertain or\u0000experimentally unknown. Their identification and spectral line data are\u0000required in reliable astrophysical spectral analyses. In motivation for\u0000improving the atomic data of Fe II, we analysed emission spectra of a Fe-Ne\u0000plasma produced by a Penning discharge lamp recorded by high-resolution Fourier\u0000transform spectroscopy in the region 9000-27,000 cm$^{-1}$ (11,111-3704 {AA}).\u0000Semi-empirical transition probability calculations and stellar spectra of Fe II\u0000were used to guide the analysis. In total, 24 energy levels of the 3d$^6$4f and\u00003d$^6$5d configurations of Fe II lying between 122,351-127,881 cm$^{-1}$ were\u0000confirmed in the laboratory for the first time, in agreement with their\u0000identities proposed by previous investigations involving only stellar spectra.\u0000Level energy and wavelength uncertainties of the 24 levels are improved by up\u0000to an order-of-magnitude compared to previously published values. These results\u0000will enable more reliable application of Fe II in astrophysical spectroscopic\u0000analyses and support further investigations of the spectrum and energy levels\u0000of Fe II.","PeriodicalId":501039,"journal":{"name":"arXiv - PHYS - Atomic Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223591","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

Domain formation and structural stabilities in mixed-species Coulomb crystals induced by sympathetically cooled highly charged ions 交感冷却高电荷离子诱导的混合种库仑晶体中的晶域形成和结构稳定性

arXiv - PHYS - Atomic Physics Pub Date : 2024-08-09 DOI: arxiv-2408.05049

L. A. Rüffert, E. A. Dijck, L. Timm, J. R. Crespo López-Urrutia, T. E. Mehlstäubler

引用次数: 0