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Edge-state-induced correlation effects in two-color pump-probe high-order harmonic generation 双色泵浦-探针高次谐波产生中的边缘态相关效应
arXiv: Atomic Physics Pub Date : 2020-10-19 DOI: 10.1103/PhysRevA.103.053121
S. V. Jensen, H. Iravani, L. Madsen
{"title":"Edge-state-induced correlation effects in two-color pump-probe high-order harmonic generation","authors":"S. V. Jensen, H. Iravani, L. Madsen","doi":"10.1103/PhysRevA.103.053121","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.053121","url":null,"abstract":"We show that two-color high-harmonic spectroscopy can reveal finite-size and edge-state-induced dynamic electron correlation effects in a generic nanostructured band-gap material. Compared to the response of a bulk sample, we demonstrate a significant correlation-induced increase in the efficiency of the generated signal over a wide range of frequencies by harnessing the power of these ultrafast many-electron dynamics.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90853920","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: 6
Analog de Sitter space in a controlled Coulomb explosion 模拟受控库仑爆炸中的德西特空间
arXiv: Atomic Physics Pub Date : 2020-10-19 DOI: 10.1103/PHYSREVA.103.043101
E. B. Kolomeisky
{"title":"Analog de Sitter space in a controlled Coulomb explosion","authors":"E. B. Kolomeisky","doi":"10.1103/PHYSREVA.103.043101","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.043101","url":null,"abstract":"The Coulomb explosion of an atomic gas steered by laser-controlled time-dependent charging can be modeled by a macroscopic system of identical charges whose number is not conserved. We show that such a system can evolve in the spatially homogeneous and isotropic fashion that mimics accelerating cosmic expansions. Specifically, for a constant rate of charge production, the resulting Friedmann-Coulomb equations have a stable fixed point corresponding to an analog of de Sitter space.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86391677","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: 2
Raman sideband cooling in optical tweezer arrays for Rydberg dressing 用于Rydberg修整的光镊阵列中的拉曼边带冷却
arXiv: Atomic Physics Pub Date : 2020-10-15 DOI: 10.21468/SCIPOSTPHYS.10.3.052
Nikolaus Lorenz, Lorenzo Festa, Lea-Marina Steinert, C. Gross
{"title":"Raman sideband cooling in optical tweezer arrays for Rydberg dressing","authors":"Nikolaus Lorenz, Lorenzo Festa, Lea-Marina Steinert, C. Gross","doi":"10.21468/SCIPOSTPHYS.10.3.052","DOIUrl":"https://doi.org/10.21468/SCIPOSTPHYS.10.3.052","url":null,"abstract":"Single neutral atoms trapped in optical tweezers and laser-coupled to Rydberg states provide a fast and flexible platform to generate configurable atomic arrays for quantum simulation. The platform is especially suited to study quantum spin systems in various geometries. However, for experiments requiring continuous trapping, inhomogeneous light shifts induced by the trapping potential and temperature broadening impose severe limitations. Here we show how Raman sideband cooling allows one to overcome those limitations, thus, preparing the stage for Rydberg dressing in tweezer arrays.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75373093","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: 19
K-shell ionization and characteristic x-ray radiation by high-energy electrons in multifoil targets 多箔靶中高能电子的k壳电离和特征x射线辐射
arXiv: Atomic Physics Pub Date : 2020-10-11 DOI: 10.1103/physreva.102.062804
S. Trofymenko
{"title":"K\u0000-shell ionization and characteristic x-ray radiation by high-energy electrons in multifoil targets","authors":"S. Trofymenko","doi":"10.1103/physreva.102.062804","DOIUrl":"https://doi.org/10.1103/physreva.102.062804","url":null,"abstract":"Processes of K-shell ionization and accompanying characteristic x-ray radiation (CXR) by high-energy electrons moving through a multifoil copper target are considered. Expressions describing the main characteristics of these processes are derived. It is shown that the average K-shell ionization cross section in the target is not defined just by the target material and the electron energy, but also depends on the number of foils in the target, their thickness and separation between them. The corresponding CXR yield is therefore not unambiguously defined by the aggregated target thickness, but depends on the above parameters as well. It is demonstrated that the average K-shell ionization cross section in a multifoil target can be several times larger than the conventional cross section of this process without the density effect impact. This results in a considerable enhancement of CXR yield from the multifoil target compared to the case of electron incidence upon a single foil of the same aggregated thickness. Comparison of CXR yield in the considered case with the yields of some other types of x-ray emission in multifoil targets is made.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84629419","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: 1
Detection of NaRb Feshbach molecules by photodissociation 光解法检测NaRb fishach分子
arXiv: Atomic Physics Pub Date : 2020-10-08 DOI: 10.1103/physreva.102.043327
Fanqi Jia, Zhichao Guo, Lintao Li, Dajun Wang
{"title":"Detection of NaRb Feshbach molecules by photodissociation","authors":"Fanqi Jia, Zhichao Guo, Lintao Li, Dajun Wang","doi":"10.1103/physreva.102.043327","DOIUrl":"https://doi.org/10.1103/physreva.102.043327","url":null,"abstract":"We demonstrate detection of NaRb Feshbach molecules at high magnetic field by combining molecular photodissociation and absorption imaging of the photofragments. The photodissociation process is carried out via a spectroscopically selected hyperfine Zeeman level correlated with the Na ($3P_{3/2}$) + Rb ($5S_{1/2}$) asymptote which, following spontaneous emission and optical pumping, leads to ground-state atoms in a single level with near unity probability. Subsequent to the dissociation, the number of molecules is obtained by detecting the resultant $^{23}$Na and $^{87}$Rb atoms. We have also studied the heating effect caused by the photodissociation process and optimized the detection protocol for extracting the temperature of the molecular cloud. This method enables the $in~situ$ detection of fast time scale collision dynamics between NaRb Feshbach molecules and will be a valuable capability in studying few-body physics involving molecules.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76702194","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: 5
A scanning quantum cryogenic atom microscope at 6 K 6k扫描量子低温原子显微镜
arXiv: Atomic Physics Pub Date : 2020-10-07 DOI: 10.21468/SCIPOSTPHYS.10.3.060
S. Taylor, Fan Yang, Brandon Freudenstein, B. Lev
{"title":"A scanning quantum cryogenic atom microscope at 6 K","authors":"S. Taylor, Fan Yang, Brandon Freudenstein, B. Lev","doi":"10.21468/SCIPOSTPHYS.10.3.060","DOIUrl":"https://doi.org/10.21468/SCIPOSTPHYS.10.3.060","url":null,"abstract":"The Scanning Quantum Cryogenic Atom Microscope (SQCRAMscope) is a quantum sensor in which a quasi-1D quantum gas images electromagnetic fields emitted from a nearby sample. We report improvements to the microscope. Cryogen usage is reduced by replacing the liquid cryostat with a closed-cycle system and modified cold finger, and cryogenic cooling is enhanced by adding a radiation shield. The minimum accessible sample temperature is reduced from 35 K to 5.8 K while maintaining low sample vibrations. A new sample mount is easier to exchange, and quantum gas preparation is streamlined.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75628906","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: 2
Absolute fraction of emitted Ps determined by geant4-supported analysis of gamma spectra 用geant4支持的伽马光谱分析确定发射Ps的绝对分数
arXiv: Atomic Physics Pub Date : 2020-10-05 DOI: 10.1103/physreva.102.062212
Benjamin Rienacker, T. Gigl, G. Nebbia, F. Pino, C. Hugenschmidt
{"title":"Absolute fraction of emitted Ps determined by geant4-supported analysis of gamma spectra","authors":"Benjamin Rienacker, T. Gigl, G. Nebbia, F. Pino, C. Hugenschmidt","doi":"10.1103/physreva.102.062212","DOIUrl":"https://doi.org/10.1103/physreva.102.062212","url":null,"abstract":"The fraction of positronium (Ps) emitted from a surface of a germanium single crystal at high temperature is usually assumed to approach unity at zero positron implantation energy. In the experiment, however, the determination of the absolute Ps fraction is not straight forward since recording a reference spectrum with SI{100}{percent} Ps formation remains demanding. We use GEANT4-simulated detector responses to $2gamma$- and $3gamma$ radiation sources mimicking positron and Ps annihilation inside the (coincidence) Doppler-broadening spectrometer at NEPOMUC, FRM II, in order to derive a reliable value for the Ps fraction re-emitted from a Ge(100)-target heated close to its melting point. Analysis of the measured spectra by fitting the simulated spectra shows an absolute value of $74,SI{+-4}{percent}$ maximum Ps formation, contradicting the SI{100}{percent}-assumption.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85054629","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: 1
Microscopic electronic structure tomography of Rydberg macrodimers Rydberg大二聚体的显微电子结构层析成像
arXiv: Atomic Physics Pub Date : 2020-10-05 DOI: 10.1103/PHYSREVRESEARCH.3.013252
Simon Hollerith, Jun Rui, Antonio Rubio-Abadal, K. Srakaew, David Wei, J. Zeiher, C. Gross, I. Bloch
{"title":"Microscopic electronic structure tomography of Rydberg macrodimers","authors":"Simon Hollerith, Jun Rui, Antonio Rubio-Abadal, K. Srakaew, David Wei, J. Zeiher, C. Gross, I. Bloch","doi":"10.1103/PHYSREVRESEARCH.3.013252","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013252","url":null,"abstract":"Precise control and study of molecules is challenging due to the variety of internal degrees of freedom and local coordinates that are typically not controlled in an experiment. Employing quantum gas microscopy to position and resolve the atoms in Rydberg macrodimer states solves almost all of these challenges and enables unique access to the molecular frame. Here, we demonstrate the power of this approach and present first photoassociation studies for different molecular symmetries in which the molecular orientation relative to an applied magnetic field, the polarization of the excitation light and the initial atomic state are fully controlled. The observed characteristic dependencies allow for an electronic structure tomography of the molecular state. We additionally observe an orientation-dependent Zeeman shift and reveal a significant influence on it caused by the hyperfine interaction of the macrodimer state. Finally, we demonstrate controlled engineering of the electrostatic binding potential by opening a gap in the energetic vicinity of two crossing pair potentials.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72831553","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: 5
Robust laboratory limits on a cosmological spatial gradient in the electromagnetic fine-structure constant from accelerometer experiments 加速度计实验中电磁精细结构常数的宇宙空间梯度的鲁棒实验室限制
arXiv: Atomic Physics Pub Date : 2020-10-05 DOI: 10.1103/PhysRevA.103.062807
Y. Stadnik
{"title":"Robust laboratory limits on a cosmological spatial gradient in the electromagnetic fine-structure constant from accelerometer experiments","authors":"Y. Stadnik","doi":"10.1103/PhysRevA.103.062807","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.062807","url":null,"abstract":"Quasar absorption spectral data indicate the presence of a spatial gradient in the electromagnetic fine-structure constant $alpha$ on cosmological length scales. We point out that experiments with accelerometers, including torsion pendula and atom interferometers, can be used as sensitive probes of cosmological spatial gradients in the fundamental constants of nature, which give rise to equivalence-principle-violating forces on test masses. Using laboratory data from the Eot-Wash experiment, we constrain spatial gradients in $alpha$ along any direction to be $|mathbf{nabla} alpha / alpha| < 6.6 times 10^{-4}~(textrm{Glyr})^{-1}$ at $95%$ confidence level. Our result represents an order of magnitude improvement over laboratory bounds from clock-based searches for a spatial gradient in $alpha$ directed along the observed cosmological $alpha$-dipole axis.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77172206","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
Photodetachment spectroscopy of quasibound states of the negative ion of lanthanum 镧负离子准束缚态的光脱离光谱
arXiv: Atomic Physics Pub Date : 2020-10-02 DOI: 10.1103/PhysRevA.102.042812
C. Walter, N. D. Gibson, N. Lyman, J. Wang
{"title":"Photodetachment spectroscopy of quasibound states of the negative ion of lanthanum","authors":"C. Walter, N. D. Gibson, N. Lyman, J. Wang","doi":"10.1103/PhysRevA.102.042812","DOIUrl":"https://doi.org/10.1103/PhysRevA.102.042812","url":null,"abstract":"The negative ion of lanthanum, La$^-$, has one of the richest bound state spectra observed for an atomic negative ion and has been proposed as a promising candidate for laser-cooling applications. In the present experiments, La$^-$ was investigated using tunable infrared photodetachment spectroscopy. The relative signal for neutral atom production was measured with a crossed ion-beam--laser-beam apparatus over the photon energy range 590 - 920 meV (2100 - 1350 nm) to probe the continuum region above the La neutral atom ground state. Eleven prominent peaks were observed in the La$^-$ photodetachment cross section due to resonant excitation of quasibound transient negative ion states in the continuum which subsequently autodetach. In addition, thresholds were observed for photodetachment from several bound states of La$^-$ to both ground and excited states of La. The present results provide information on the excited state structure and dynamics of La$^-$ that depend crucially on multielectron correlation effects.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89587653","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: 2
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