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Resonant Conversion of Wave Dark Matter in the Ionosphere.
Phys Rev Lett
December 2024
Departement de Physique Theorique, Universite de Geneve, 24 quai Ernest Ansermet, 1211 Geneve 4, Switzerland.
Article Synopsis
- Researchers are investigating how resonant dark matter can convert into low-frequency radio waves in Earth's ionosphere, particularly in the mass range of about 10^{-9} to 10^{-8} eV.
- The typical methods for calculating this conversion are inadequate due to the nonrelativistic nature of dark matter, so a new approach involving a second-order boundary-value problem is applied.
- Using a small dipole antenna to detect these radio waves could increase sensitivity to dark photon and axionlike particle dark matter, offering a new avenue for exploring uncharted regions of dark matter physics.
Electron Localization Function for Noncollinear Spins.
Phys Rev Lett
September 2024
Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, Via Campi 213A, I-41125 Modena, Italy.
Article Synopsis
- - Understanding bonding is crucial for predicting how materials behave, and the electron localization function (ELF) is a key tool for identifying bonds and atomic structures.
- - The ELF struggles with more complex states beyond simple nonrelativistic scenarios, particularly for open-shell solutions that require attention to specific gauge invariances.
- - An extended version of ELF can enhance the analysis of both complicated and simpler systems by considering both U(1) and SU(2) gauge invariances together.
Application of the Adiabatic Connection Random Phase Approximation to Electron-Nucleus Hyperfine Coupling Constants.
J Phys Chem A
August 2024
Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany.
The electron-nucleus hyperfine coupling constant is a challenging property for density functional methods. For accurate results, hybrid functionals with a large amount of exact exchange are often needed and there is no clear "one-for-all" functional which describes the hyperfine coupling interaction for a large set of nuclei. To alleviate this unfavorable situation, we apply the adiabatic connection random phase approximation (RPA) in its post-Kohn-Sham fashion to this property as a first test.
View Article and Find Full Text PDFToward Accurate Spin-Orbit Splittings from Relativistic Multireference Electronic Structure Theory.
J Phys Chem Lett
July 2024
Department of Chemistry and Cherry Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States.
Most nonrelativistic electron correlation methods can be adapted to account for relativistic effects, as long as the relativistic molecular spinor integrals are available, from either a four-, two-, or one-component mean-field calculation. However, relativistic multireference correlation methods remain a relatively unexplored area, with mixed evidence regarding the improvements brought by perturbative treatments. We report, for the first time, the implementation of state-averaged four-component relativistic multireference perturbation theories to second and third order based on the driven similarity renormalization group (DSRG).
View Article and Find Full Text PDFTheoretical investigations of structural, electronic, magnetic, and optical properties of group V (X = V, Nb, Ta) added CeO-X materials for optoelectronic applications.
J Mol Model
May 2024
Laboratory of Theoretical and Experimental Physics, Institute of Phyiscs (IoP), Bahauddin Zakariya University, Multan, 60800, Pakistan.
Context: Depletion of natural resources, responsible for energy production, is a serious concern for researchers to develop alternate energy resources or materials. Scientists have proposed various energy materials which are based on semiconductors and their underlying physics. Cerium oxide (CeO) is a versatile energy material which receives much attention owing to excellent photocatalytic, photonic, thermal stability, and optoelectronic applications.
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