/ en-us Â鶹ÒùÔº internet news portal provides the latest news on science including: Â鶹ÒùÔºics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Electrostatic capacitors are a key component in high-power pulse equipment, power transmission and transformation engineering, new energy vehicles, and 5G communication. Their capability for ultrafast charging-discharging and ultrahigh power density is pivotal for their performance. /news/2024-07-strategy-breakdown-strength-polarization-dielectric.html Nanomaterials Wed, 17 Jul 2024 17:33:03 EDT news640456382 In work published in npj Quantum Materials, a team led by Prof. Leonardo Degiorgi in the Department of Â鶹ÒùÔºics at ETH Zurich has studied the broadband charge dynamics (i.e., longitudinal optical conductivity) of the ferromagnetic (FM), non-centrosymmmetric PrAlGe material. They reveal its electronic environment, based on correlated Weyl states, which favors an unusually large anomalous Hall conductivity (AHC) at low temperatures. The researchers thus propose a suitable experimental approach to trace the relevant ingredients of the electronic structure deploying substantial Berry curvatures, indispensable for AHC. /news/2022-11-dynamics-non-centrosymmetric-magnetic-weyl-semimetal.html Quantum Â鶹ÒùÔºics Mon, 07 Nov 2022 15:54:16 EST news587058851 In the fields of chemistry and materials, most successful, widely used machine learning schemes introduced over the last decade aim to model molecular energies or interatomic potentials. Accordingly, the representations used to map atomic configurations into vectors of descriptors or features used as model inputs reflect fundamental properties of the interatomic potential such as invariance to permutation between identical atoms, rigid rotation or inversion of the molecular structure. They also reflect notions of locality and nearsightedness—the idea that potential local electronic properties depend significantly on the effective external potential only at nearby points—of many components of interatomic energy. /news/2022-01-equivariant-representations-molecular-hamiltonians-n-center.html Analytical Chemistry Materials Science Mon, 10 Jan 2022 15:45:30 EST news561051927 Advanced optoelectronics require materials with newly engineered characteristics. Examples include a class of materials named metal-halide perovskites that have tremendous significance to form perovskite solar cells with photovoltaic efficiencies. Recent advances have also applied perovskite nanocrystals in light-emitting devices. The unusually efficient light emission of cesium lead-halide perovskite may be due to a unique excitonic fine structure made of three bright triplet states that minimally interact with a proximal dark singlet state. Excitons are electronic excitations responsible for the emissive properties of nanostructured semiconductors, where the lowest-energy excitonic state is expected to be long lived and hence poorly emitting (or 'dark'). /news/2021-01-multidimensional-coherent-spectroscopy-reveals-triplet.html Nanophysics Nanomaterials Tue, 19 Jan 2021 09:30:04 EST news530177034 (Â鶹ÒùÔº)—Stuart Kauffman, from the University of Calgary, and several of his colleagues have recently published a paper on the Arxiv server titled 'Quantum Criticality at the Origins of Life'. The idea of a quantum criticality, and more generally quantum critical states, comes perhaps not surprisingly, from solid state physics. It describes unusual electronic states that are are balanced somewhere between conduction and insulation. More specifically, under certain conditions, current flow at the critical point becomes unpredictable. When it does flow, it tends to do so in avalanches that vary by several orders of magnitude in size. /news/2015-04-quantum-criticality-life-proteins.html Quantum Â鶹ÒùÔºics Wed, 15 Apr 2015 03:54:10 EDT news348144521 (Â鶹ÒùÔº) —Armed with just the right atomic arrangements, superconductors allow electricity to flow without loss and radically enhance energy generation, delivery, and storage. Scientists tweak these superconductor recipes by swapping out elements or manipulating the valence electrons in an atom's outermost orbital shell to strike the perfect conductive balance. Most high-temperature superconductors contain atoms with only one orbital impacting performance—but what about mixing those elements with more complex configurations? /news/2014-02-superconductivity-orbit-scientists-path-loss-free.html Superconductivity Thu, 13 Feb 2014 13:47:46 EST news311521654 Futuristic ideas for the use of superconductors, materials that allow electric current to flow without resistance, are myriad: long-distance, low-voltage electric grids with no transmission loss; fast, magnetically levitated trains; ultra-high-speed supercomputers; superefficient motors and generators; inexhaustible fusion energy - and many others, some in the experimental or demonstration stages. /news/2010-09-superconductors-future.html Superconductivity Fri, 10 Sep 2010 14:17:26 EDT news203346998