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Effects of the Quantum Vacuum at a Cosmic Scale and of Dark Energy.
Entropy (Basel)
November 2024
Departamento de Física, Universidad de Cantabria, 39005 Santander, Spain.
The Einstein equation in a semiclassical approximation is applied to a spherical region of the universe, with the stress-energy tensor consisting of the mass density and pressure of the ΛCDM cosmological model plus an additional contribution due to the quantum vacuum. Expanding the equation in powers of Newton constant G, the vacuum contributes to second order. The result is that at least a part of the acceleration in the expansion of the universe may be due to the quantum vacuum fluctuations.
View Article and Find Full Text PDFPlanar Hall plateau in magnetic Weyl semimetals.
Sci Bull (Beijing)
January 2025
Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China; Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China; International Center for Quantum Materials, Beijing Institute of Technology, Zhuhai 519000, China. Electronic address:
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- * This connection indicates that the PHE is stable across various conditions, unaffected by specific system details such as the Fermi energy, especially because magnetic Weyl points break time-reversal symmetry and have energy tilt.
- * The research utilizes semiclassical Boltzmann theory to show that the PHE conductivity is related to the Chern number and energy tilt, predicting new quantized PHE plateaus, while also highlighting the rich interplay between topology and magnetism in this context.
Orbital Hall Effect Accompanying Quantum Hall Effect: Landau Levels Cause Orbital Polarized Edge Currents.
Phys Rev Lett
October 2024
Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle (Saale), Germany.
The quantum Hall effect emerges when two-dimensional samples are subjected to strong magnetic fields at low temperatures: Topologically protected edge states cause a quantized Hall conductivity in multiples of e^{2}/h. Here we show that the quantum Hall effect is accompanied by an orbital Hall effect. Our quantum mechanical calculations fit well the semiclassical interpretation in terms of "skipping orbits.
View Article and Find Full Text PDFprediction of gigantic anomalous Nernst effect in ferromagnetic monolayer transition metal trihalides.
J Phys Condens Matter
October 2024
Nanomaterials Research Institute, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.
The anomalous Hall conductivity of all transition metal trihalides was explored using first-principles calculations. Employing the Fukui-Hatsugai-Suzuki method, we found that ferromagnetic monolayersBr(= Pd, Pt) possessed the quantized anomalous Hall conductivity (QAHC) with and without carrier doping. Due to unique QAHC, their transverse thermoelectric properties ofBr(= Pd, Pt) were investigated.
View Article and Find Full Text PDFSemiclassical dynamics in Wigner phase space II: Nonadiabatic hybrid Wigner dynamics.
J Chem Phys
September 2024
Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, USA.
We present an approximate semiclassical (SC) framework for mixed quantized dynamics in Wigner phase space in a two-part series. In the first article, we introduced the Adiabatic Hybrid Wigner Dynamics (AHWD) method that allows for a few important "system" degrees of freedom to be quantized using high-level double Herman-Kluk SC theory while describing the rest (the "bath") using classical-limit linearized SC theory. In this second article, we extend our hybrid Wigner dynamics to nonadiabatic processes.
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