Examining statistical isotropy of CMB low multipoles from Planck PR4 data
Not Available
Aluri, Pavan Kumar (ORCID:0000000243339819)↗
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Results for “MULTIPOLES”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Release of windowed multipole library for ENDF/B-VIII.0 in support of OpenMC criticality and depletion analysis
Not Available
Yu, Jiankai (ORCID:0000000180299847)↗
Mapping valence electron distributions with multipole density formalism using 4D-STEM
Recent advancement in aberration correction and detector technology opened a door to various applications using 4D-STEM, which yields a diffraction pattern for each scanning position within a crystal unit-cell in scanning transmission electron microscopy (STEM) and generates incredible amounts of data in momentum space. Currently 4D-STEM analysis relies on the center-of-mass of the diffraction patterns in electric field and charge density mapping. It only derives the total projected charge density and is limited to phase objects, e.g. extremely thin samples. Here, we propose a new analytical method to accurately map aspherical valence electron distributions with atom-centered multipolar functions formalism using the whole 4D-STEM dataset. We demonstrate that, with the full dynamical calculations for various sample thicknesses, the method is sensitive not only to the miniscule charge transfer, but also to the atomic site symmetry and aspherical electron orbitals. The process of the refinement is much more robust and reliable than quantitative convergent beam electron diffraction.
4D-STEM↗
Interplay between multipolar order and multipole-induced superconductivity in PrTi 2 Al 20
Multipolar moments entail a new route to tackle frontier problems in superconductivity (SC). A key progress in the search for multipolar SC is the discovery of PrTr 2 Al 20 (Tr = Ti, V), which possesses quadrupolar and octupolar but no magnetic dipolar moments. The Kondo entanglement of these multipolar moments with conduction electrons leads to exotic SC within the multipolar ordered phase, though the precise nature of the SC remains unexplored. We experimentally investigate the SC gap structure of SC in PrTi 2 Al 20 and its La-doping evolution. Our results indicate deviations from a single s-wave gap, instead favoring nodal d-wave or multiple gaps. While the SC is robust against La dilution, the SC gap structure changes with minimal La doping, coinciding with a sharp change in the ferroquadrupolar (FQ) order. This suggests an intimate link between the quadrupolar order parameter and SC pairing, providing insight into the coexistence of SC with multipolar order.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
Multipole polaron roams the devil’s staircase
We report Electron–boson interaction (EBI) has an important role in the properties of materials. Electron–phonon interaction in good metals can give rise to superconductivity, where electrons flow without dissipation below a critical temperature. In ionic crystals such as organic semiconductors, the coupling of low-energy electrons (or holes) with the atomic vibrations can drive the formation of polarons — an electron dressed with a phonon cloud, with lower mobility and heavy effective mass. The same notion can be applied to strongly correlated electron systems. Electron–spin fluctuation coupling drives unconventional superconductivity in high-temperature cuprates, iron-based superconductors and heavy-fermion systems. Magnetic polarons can form around charged dopants in an otherwise antiferromagnetic background of a Mott insulator, while an electron–polaron is also possible, via electron–plasmon coupling, when a Kondo hole is introduced in a heavy-fermion material, similar to a plasmaron in doped graphene.
36 MATERIALS SCIENCE↗
MXene-antenna electrode with collective multipole resonances
The work explores multipolar excitations in and utilization of nanostructured transition metal carbides and nitrides (MXene) layers in designing a photodetector electrode that exhibits enhanced response through hot-electron generation.
Chemistry↗
Progress on Neutron-Target Multipoles above 1 GeV
We report a new extraction of nucleon resonance couplings using π{sup -} photo-production cross sections on the neutron. The world database for the process γn → π{sup -}p above 1 GeV has quadrupled with the addition of new differential cross sections from the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab in Hall B. Differential cross sections from CLAS have been improved with a new final-state interaction determination using a diagrammatic technique taking into account the SAID phenomenological NN and πN final-state interaction amplitudes. Resonance couplings have been extracted and compared to previous determinations. With the addition of these new cross sections, significant changes are seen in the high-energy behavior of the SAID cross sections and amplitudes.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Towards an optical far-field measurement of higher-order multipole contributions to the scattering response of nanoparticles
We experimentally show an all-optical multipolar decomposition of the lowest-order eigenmodes of a single gold nanoprism using azimuthally and radially polarized cylindrical vector beams. By scanning the particle through these tailored field distributions, the multipolar character of the eigenmodes gets encoded into 2D-scanning intensity maps even for higher-order contributions to the eigenmode that are too weak to be discerned in the direct far-field scattering response. This method enables a detailed optical mode analysis of individual nanoparticles.
77 NANOSCIENCE AND NANOTECHNOLOGY↗
The creation, destruction, and transfer of multipole moments in electron–ion three-body recombination using the Gell-Mann–Goldberger–Watson method
Explore the source record for details and available documents.
Csanak, G.↗
Consistency tests for Planck and WMAP in the low multipole domain
Recently, full sky maps from Planck have been made publicly available. In this paper, we do consistency tests for the three Planck CMB sky maps. We assume that the difference between two maps represents the contributions from systematics, noise, foregrounds and other sources, and that a precise representation of the Cosmic Microwave Background should be uncorrelated with it. We investigate the cross correlation in pixel space between the difference maps and the various Planck maps and find no significant correlations, in comparison to 10000 random Gaussian simulated maps. Additionally we investigate the difference map between the WMAP ILC 9 year map and the ILC 7 year map. We perform cross correlations between this difference map, and the ILC9 and ILC7, and find significant correlations only for the ILC9, at more than the 99.99% level. Likewise, a comparison between the Planck NILC map and the WMAP ILC9 map, shows a strong correlation for the ILC9 map with the difference map, also at more than the 99.99% level. Thus the ILC9 appears to be more contaminated than the ILC7, which should be taken into consideration when using WMAP maps for cosmological analyses.
79 ASTRONOMY AND ASTROPHYSICS↗
CMB low multipole alignments in the ΛCDM and dipolar models
The dipolar model [1] has attracted much interest because it may phenomenologically explain the CMB hemispherical power asymmetry found in the WMAP and Planck data. Since such a model explicitly breaks isotropy at large angular scales it is natural to wonder whether it can also explain other CMB directional anomalies. Focusing on the low ℓ alignments and assuming ΛCDM, we confirm that the quadrupole/octupole and the dipole/quadrupole/octupole alignments are anomalous with a significance up to 99.9% C.L., for both WMAP and Planck data. Moreover, we show for the first time that such features are anomalous also in the dipolar model, roughly at the same level as in ΛCDM . We conclude that the dipolar model does not provide a better fit to the data than the ΛCDM.
79 ASTRONOMY AND ASTROPHYSICS↗
Blackbody radiation shift, multipole polarizabilities, oscillator strengths, lifetimes, hyperfine constants, and excitation energies in Hg{sup +}
Excitation energies of the [Xe]4f{sup 14}5d{sup 10}ns, [Xe]4f{sup 14}5d{sup 10}np{sub j}, [Xe]4f{sup 14}5d{sup 10}nd{sub j}, [Xe]4f{sup 14}5d{sup 10}n{sup '}f{sub j}, and [Xe]4f{sup 14}5d{sup 10}n{sup '}g{sub j} states in Hg{sup +} are evaluated (n{<=}10, n{sup '}{<=}9, and [Xe]=1s{sup 2}2s{sup 2}2p{sup 6}3s{sup 2}3p{sup 6}3d{sup 10}4s{sup 2}4p{sup 6}4d{sup 10}5s{sup 2}5p{sup 6}). First-, second-, third-, and all-order Coulomb energies and first- and second-order Coulomb-Breit energies are calculated. Reduced matrix elements, oscillator strengths, and transition rates are determined for electric-dipole transitions, including the ns (n=6-11), np (n=6-10), nd (n=6-10), nf (n=5-9), and ng (n=5-9) states. Lifetime values are determined for all above-mentioned states. The ground state E1, E2, and E3 polarizabilities are evaluated. The hyperfine structure in {sup 199}Hg{sup +} and {sup 201}Hg{sup +} ions is investigated. The hyperfine A and B values are determined for the first low-lying levels up to n = 7. The quadratic Stark effect on hyperfine structure levels of {sup 199}Hg{sup +} and {sup 201}Hg{sup +} ground states is investigated. The calculated shift for the {sup 199}Hg{sup +} (F = 1, M = 0) {r_reversible} (F = 0, M = 0) transition is -0.0597(2) Hz/(kV/cm){sup 2}, in agreement with previous theoretical result -0.060(3) Hz/(kV/cm){sup 2}. These calculations provide a theoretical benchmark for comparison with experiment and theory and provide values of blackbody radiation shifts for microwave frequency standards with {sup 199}Hg{sup +} and {sup 201}Hg{sup +} ions.
74 ATOMIC AND MOLECULAR PHYSICS↗
Third integer resonance extraction with presence of higher multipoles
Not Available
43 PARTICLE ACCELERATORS↗
Quantum vortex lattice: Lifshitz duality, topological defects, and multipole symmetries
Not provided.
Materials Science↗
Jülich-Bonn-Washington model for pion electroproduction multipoles
Pion electroproduction off the proton is analyzed in a new framework based on a general parametrization of transition amplitudes, including constraints from gauge invariance and threshold behavior. Data with energies 1.13 GeV < W < 1.6 GeV and Q 2 below 6 Ge V 2 are included. The model is an extension of the latest Jülich-Bonn solution incorporating constraints from pion-induced and photoproduction data. Here, performing large-scale fits (≈10 5 data) we find a set of solutions with $χ^2_{\text{dof}}$ = 1.69–1.81 which allows us to assess the systematic uncertainty of the approach.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗