Category: 4. Physics
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Chiral antiferromagnetic Josephson junctions as spin-triplet supercurrent spin valves and d.c. SQUIDs
Intensive studies in coupling superconducting condensate state with magnetic-exchange spin splitting have opened up a research field of superconducting spintronics1,2,3, which promises to realize dissipationless spin-based logic and memory technologies. Of particular relevance in this research is the theoretical prediction4,5,6,7 and experimental verification8,9,10,11,12 that spin-polarized triplet pairing states can be created via spin-mixing and spin-rotation…
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Autonomous atomic Hamiltonian construction and active sampling of X-ray absorption spectroscopy by adversarial Bayesian optimization
Fitting CFM with active-learning sampling Keeping in mind that the goal of the ABO algorithm is to reach the standard real spectrum with as few sampling points as possible. Starting with the CFM model, there are 9 independent parameters, including the Coulomb interaction \(F_{dd}^2\), \(F_{dd}^4\), \(F_{pd}^2\), \(G_{pd}^1\), \(G_{pd}^3\), the crystal splitting \(10D_q\), the spin–orbital coupling…
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Ambipolar charge-transfer graphene plasmonic cavities
Grigorenko, A. N., Polini, M. & Novoselov, K. S. Graphene plasmonics. Nat. Photon. 6, 749–758 (2012). Article CAS Google Scholar Basov, D. N., Fogler, M. M. & García de Abajo, F. J. Polaritons in van der Waals materials. Science 354, aag1992 (2016). Article Google Scholar Cox, J. D. & García de Abajo, F. J. Nonlinear…
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Direct characterization of shear phonons in layered materials by mechano-Raman spectroscopy
Hunt, B. et al. Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure. Science 340, 1427–1430 (2013). Article ADS Google Scholar Xu, W. G. et al. Correlated fluorescence blinking in two-dimensional semiconductor heterostructures. Nature 541, 62–67 (2017). Article ADS Google Scholar Huang, B. et al. Layer-dependent ferromagnetism in a van der Waals…
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Age and market capitalization drive large price variations of cryptocurrencies
Our results are based on daily price time series of 7111 cryptocurrencies that comprise a significant part of all currently available cryptoassets (see “Methods” for details). From these price series, we have estimated their logarithmic returns $$\begin{aligned} r_t = \ln (x_t / x_{t+1}), \end{aligned}$$ (1) where \(x_t\) represents the price of a given cryptocurrency at…
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Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets
Sample details For this work, we sputter-deposited Pt0.75Ti0.25 (5.6 nm)/FexTb1-x (8 nm) bilayers with different Fe volumetric concentrations (x = 0.3–1). The Pt0.75Ti0.25 layer, a dirty-limit Pt alloy with strong intrinsic spin Hall effect17, sources spin current that exerts SOT on the FIM FexTb1-x. Each sample was deposited by co-sputtering on an oxidized Si substrate with a 1 nm Ta…
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Quantum mechanics is not a description of objective reality—it reveals a world of genuine free will
In a cubist painting, reality is more than a single perspective can capture. Credit: wikipedia, CC BY-SA What does quantum mechanics, the most successful theory ever proposed by physics, teach us about reality? The starting point for most philosophers of physics is that quantum mechanics must somehow provide a description of the world as it…
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Experiment finds gluon mass in the proton
The proton mass radius is smaller than the electric charge radius (a dense core), while a cloud of scalar gluon activity extends beyond the charge radius. This finding could shed light on confinement and the mass distribution in the proton. Credit: Argonne National Laboratory Nuclear physicists may have finally pinpointed where in the proton a…
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Machine learning sharpens images from scanning transmission electron microscopes – Physics World
Machine learning sharpens images from scanning transmission electron microscopes – Physics World Skip to main content Close search menu Discover more from Physics World Copyright © 2023 by… Continue Reading News Source: physicsworld.com
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Piezoelectric effect in liquids observed for the first time
Graphical abstract. Credit: The Journal of Physical Chemistry Letters (2023). DOI: 10.1021/acs.jpclett.3c00329 A pair of chemists at Michigan State University has observed the piezoelectric effect in liquids for the first time. In their paper published in The Journal of Physical Chemistry Letters, Md. Iqbal Hossain and G. J. Blanchard, describe accidently observing the property while…