Controlling the layer number of superconducting (SC) units can effectively modulate superconductivity of layered materials. Here, through first-principles calculations, the electronic and SC properties of beryllenes h...
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Controlling the layer number of superconducting (SC) units can effectively modulate superconductivity of layered materials. Here, through first-principles calculations, the electronic and SC properties of beryllenes have been systematically investigated. The SC transition temperature Tc shows nonmonotonic behavior, with maximum of 8.5 K for AB-stacking and 6.4 K for ABC-stacking trilayer beryllenes. Notably, these Tc are two orders of magnitude higher than 0.026 K of bulk beryllium attributed to the enhanced electron-phonon coupling from phonon softening of surface Be and the increased density of states at the Fermi level. Additionally, several beryllenes exhibit nontrivial band topology, providing platforms for studying topological superconductivity. Moreover, all the beryllenes show the electride nature due to interstitial anionic electrons. These results highlight the importance of reduced dimensionality on physical properties and offer the first example of a single-element material with trilayer SC units achieving the highest Tc.
The field of molecular programming allows for the programming of the structure and behavior of matter at the molecular level, even to the point of encoding arbitrary computation. However, current approaches tend to be...
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The neutron radiation field has vital applications in areas such as biomedicine,geology,radiation safety,and many others for neutron detection and neutron *** neutron fluence rate perturbation accurately is an importa...
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The neutron radiation field has vital applications in areas such as biomedicine,geology,radiation safety,and many others for neutron detection and neutron *** neutron fluence rate perturbation accurately is an important yet challenging *** study proposes a correction method that analyzes three physical *** method,which transforms the detection process from point detection to area detection,is based on a novel physical model and has been validated through theoretical analyses,experiments,and *** to the average differences between the calculated and experimental results,the new method(1.67%)demonstrated better accuracy than the traditional simulation(2.17%).In a closed thermal neutron radiation field,the detector or strong neutron absorption material significantly perturbs the neutron fluence rate,whereas its impact on the energy spectrum shape and neutron directionality is relatively ***,based on the calculation results of the perturbation rate formula for medium materials with different compositions and sizes,the larger the volume and capture cross section of the medium,the higher the perturbation rate generated in the closed radiation field.
Pyrovanadates are considered a promising host material for the reversible intercalation of highly charged Ca2+ions due to their favorable layered structure and the presence of rich interstitial confined ***,in calcium...
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Pyrovanadates are considered a promising host material for the reversible intercalation of highly charged Ca2+ions due to their favorable layered structure and the presence of rich interstitial confined ***,in calcium-ion battery（CIB） systems,the diffusion kinetics of the Ca2+ions are slower,and the electrostatic interactions are stronger（compared to Li+）,which limits the effectiveness of pyrovanadate's structural *** this study,we employ an allelic reconfiguration strategy to develop novel solid-solution phase pyrovanadate materials,specifically Zn3-xCux（OH）2V2O7·2H2O（x=0,1,1.5）.By incorporating 'twin' isotopic Cu elements from the adjacent ds-block,we activate redox reactions at non-vanadium metal sites through the modulation of electronic *** a result,a pronounced plateau zone during the discharge/charge process is observe *** theoretical simulations and X-ray absorption spectroscopy,we have clarified the mechanism by which the solid solution enhances the interlayered confinement of species such as lattice water and hydroxide radicals,improving structural stability and facilitating the diffusion of highly charged Ca2+*** approach effectively addresses the issue of layer shrinkage,which typically arises from the intense Coulombic interaction between the carrier and the *** assembled with an active carbon anode,coin-cell CIB devices can operate steadily at a charge rate of 100 mA g-1for over 1000 reversible *** demonstrates the potential of innovative solid-solution design strategies to create Coulombic-force-resistant host materials for future multivalent metal-ion battery technologies,including CIB systems.
In recent years, first-order and second-order topological phonons have been discovered in crystalline materials, which has aroused great interest. In the present work, through symmetry analysis and bulk polarization c...
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In recent years, first-order and second-order topological phonons have been discovered in crystalline materials, which has aroused great interest. In the present work, through symmetry analysis and bulk polarization calculation, we demonstrate that semihydrogenated graphene (i.e., graphone) is an ideal platform intrinsically possessing hybrid-order (first-order and second-order) phonon topology. Based on the acoustic sum rule correction of the phonon tight-binding Hamiltonian, we show that the first-order optical and acoustic topological phonon edge states as well as second-order topological phonon corner states can coexist in graphone. Interestingly, the twofold degeneracy of topological acoustic phonon edge modes in graphene is eliminated due to spatial inversion breaking in graphone. In addition, there are three topological corner states within the wide gap of the phonon spectrum of the zigzag-edged nanodisk. Our results not only show hybrid-order topological phonon properties in graphone but also pave the way for a more complete understanding of topological phonons in other crystalline materials.
A quantum coherent screening cloud around a magnetic impurity in metallic systems is the hallmark of the antiferromagnetic Kondo effect. Despite the central role of the Kondo effect in quantum materials, the structure...
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A quantum coherent screening cloud around a magnetic impurity in metallic systems is the hallmark of the antiferromagnetic Kondo effect. Despite the central role of the Kondo effect in quantum materials, the structure of quantum correlations of the screening cloud has defied direct observations. In this work, we introduce a machine-learning algorithm that allows one to spatially map the entangled electronic modes in the vicinity of the impurity site from experimentally accessible data. We demonstrate that local correlators allow reconstruction of the local many-body correlation entropy in real space in a double Kondo system with overlapping entanglement clouds. Our machine-learning methodology allows bypassing the typical requirement of measuring long-range nonlocal correlators with conventional methods. We show that our machine-learning algorithm is transferable between different Kondo system sizes, and we show its robustness in the presence of noisy correlators. Our work establishes the potential machine-learning methods to map many-body entanglement from real-space measurements.
In this study, we integrate the established obstacle problem formulation from ice sheet modeling [12, 20] with cutting-edge deep learning methodologies to enhance ice thickness predictions, specifically targeting the ...
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The applications based on models concerning fractional delay differential models influenced by stochastic behavior have gained great interest in physical and natural sciences. This paper employs contraction mapping in...
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The applications based on models concerning fractional delay differential models influenced by stochastic behavior have gained great interest in physical and natural sciences. This paper employs contraction mapping in Banach spaces to validate the TE-U of a certain class of M-fractional SDDMs driven by SBM. For this aim, we establish some suitable Lipschitz constraints on the drift and the diffusion coefficients and employ a weighted normed space based on the space $${\text{{\rm H}}}p$$ for $$p \geqslant 2$$ . For convenience, BDGI estimates the stochastic terms in the desired proofs. The theoretical findings are followed by constructing a numerical step spectral method to provide approximate solutions to the suggested models. In this method, we organize steps to deal with the delay terms in subintervals, and the desired approximations in each subinterval are obtained using a collocation spectral mechanism, where the test functions are the orthogonal SLPs in which the problem is condensed into a group of computational simultaneous equations. For the stochastic term, the quantities of the SBM paths are assessed with the MATHEMATICA program. Moreover, the convergence study is confirmed for the presented approach to capture the behavior of approximations. Ultimately, applications of various forms are solved and shown in terms of tables, figures, and notations, whilst the obtained results emphasize the accuracy and validity of the constructed algorithm steps. The eloquent method formulation indicates the ability to use it in solving other types of fractional stochastic delay differential models that appear in various scientific and engineering domains.
We systematically investigate the effects of Kitaev interaction on magnetic orders and anisotropy in both triangular and honeycomb lattices on the classical level. Our study highlights the critical role of the Kitaev ...
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We systematically investigate the effects of Kitaev interaction on magnetic orders and anisotropy in both triangular and honeycomb lattices on the classical level. Our study highlights the critical role of the Kitaev interaction in modulating phase boundaries and predicting new phases, e.g., zigzag phase in triangular lattice and AABB phase in honeycomb lattice, which are absent with pure Heisenberg interactions. Moreover, we reveal the special state-dependent anisotropy of Kitaev interaction, and develop a general method that can determine the presence of Kitaev interaction in different magnets. It is found that the Kitaev interaction does not induce anisotropy in some magnetic orders such as ferromagnetic order, while it can cause different anisotropy in other magnetic orders. Furthermore, we emphasize that the off-diagonal Γ interaction also contributes to anisotropy, competing with the Kitaev interaction to reorient spin arrangements. Our work establishes a framework for comprehensive understanding the impact of Kitaev interaction on ordered magnetism.
We explore the feasibility of extracting electroweak observables from a measurement of atomic parity violation in hydrogen. Our proposed quantum-control scheme focuses on the 2s−3s or 2s−4s transitions in hydrogen. Th...
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We explore the feasibility of extracting electroweak observables from a measurement of atomic parity violation in hydrogen. Our proposed quantum-control scheme focuses on the 2s−3s or 2s−4s transitions in hydrogen. This work is motivated by the recently observed anomaly in the W-boson mass, which may substantially modify the Standard Model value of the proton weak charge. We also study the accuracy of the previously employed approximations in computing parity-violating effects in hydrogen.
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