Category: 4. Physics
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Holey lens focuses extreme-UV radiation
A perforated silicon metalens focuses UV light in this illustration. Credit: Second Bay Studios/Harvard SEAS Extreme-UV light of 10–121 nm wavelength is incredibly useful for performing ultrafast spectroscopy and imprinting ever-smaller transistors on computer chips, yet it is also incredibly difficult to harness. The radiation is strongly absorbed by a wide variety of materials because…
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Simulations shed light on mechanisms of DNA damage during proton therapy – Physics World
Simulations shed light on mechanisms of DNA damage during proton therapy – Physics World Skip to main content Close search menu Discover more from Physics World Copyright © 2023 by IOP… Continue Reading News Source: physicsworld.com
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New reactor in Missouri will expand medical isotope production
The reactor core at the University of Missouri Research Reactor. Credit: University of Missouri The University of Missouri announced last month that it will build a new research reactor with double the power and neutron flux of the university’s MURR reactor, which is currently the highest-power US research reactor outside a government facility. By providing…
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Low-frequency quantum oscillations in LaRhIn5: Dirac point or nodal line?
arising from C. Guo et al. Nature Communications https://doi.org/10.1038/s41467-021-26450-1 (2021) In the recent paper1, a new method based on measuring a temperature correction to a quantum-oscillation frequency was proposed to study an energy-band dispersion of charge carriers in small Fermi surface (FS) pockets of crystals. To illustrate their approach, the authors of ref. 1 applied it…
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Epsilon-near-zero (ENZ)-based optomechanics | Communications Physics
Geometry of the problem Figure 1a presents the geometry of our problem. A polarizable particle, made of a single nonmagnetic material (or multilayered materials), surrounded by an external medium (e.g., water) of refractive index nm, is located at an edge-to-edge distance h above a metamaterial substrate. The particle can be spherical (or other shapes as will…
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Characteristics of flight delays during solar flares
Solar X-ray events are defined by soft X-ray (1–8 Å) fluxes from the GOES satellites, and they can be obtained from the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center (SWPC). The details for determining the begin, maximum, and end times of an X-ray event can be found on the NOAA website22or in the…
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Reply to: Low-frequency quantum oscillations in LaRhIn5: Dirac point or nodal line?
replying to G. P. Mikitik & Y. V. Sharlai Nature Communications https://doi.org/10.1038/s41467-023-37692-6 (2023) We thank G.P. Mikitik and Yu.V. Sharlai for contributing this note1 and the cordial exchange about it. First and foremost, we note that the aim of our paper2 is to report a methodology to diagnose topological (semi)metals using magnetic quantum oscillations. Thus…
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Modulation of internal solitary waves by the Kuroshio in the northern South China Sea
Model validation The simulated results are validated by comparing with satellite observations. The surface convergence and divergence zones included by ISWs lead to variations of sea surface roughness. Following Gong38, we calculated the gradient of sea surface height \(|\nabla \eta |\), from which the wavefronts are detected. In Fig. 2a, three ISWs radiate westward from the…
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Superconductivity and correlated phases in non-twisted bilayer and trilayer graphene
Onnes, H. K. The superconductivity of mercury. Comm. Phys. Lab. Univ. Leiden 122, 124 (1911). Google Scholar Ginzburg, V. L. & Landau, L. D. On the theory of superconductivity. Sov. Phys. JETP 20, 1064 (1950). Google Scholar Bardeen, J., Cooper, L. N. & Schrieffer, J. R. Theory of superconductivity. Phys. Rev. 108, 1175–1204 (1957). Article …
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Neural networks determination of material elastic constants and structures in nematic complex fluids
The developed neural networks-based method for determining elastic constants is based on the combined modeling of (i) liquid crystal effective dynamics, (ii) light transmission, and (iii) supervised machine learning, as then applicable both to experimental or modeling data. The method starts by calculating a large number of time-dependent light beam transmittance functions I(t) during the…