The diffused phase transition distinguishes relaxors from “classical” ferroelectrics, and it manifests itself as a frequency-dependent anomaly of the dielectric response stretched by hundreds of…
Category: 4. Physics
-
Topological excitonic insulator with tunable momentum order
Keldysh, L. & Kopaev, Y. Possible instability of semimetallic state toward Coulomb interaction. Sov. Phys. Solid State 6, 2219–2224 (1964).
Cloizeaux, J. D. Exciton instability and…
Continue Reading
-
Breathing ferroelectricity induced topological valley states in kagome niobium halide monolayers
Intrinsic structure and electronic properties
The corresponding properties are studied in detail using Nb3I8 as an example. As illustrated in Fig. 1a, bulk Nb3I8 consists of six layers stacked through interlayer van der Waals stacking, exhibiting…
Continue Reading
-
Measurement of phonon angular momentum
Einstein, A. & de Haas, W. J. Experimental proof of the existence of Ampère’s molecular currents. KNAW Proc. 18, 696–711 (1915).
Scott, G. G. Review of gyromagnetic ratio experiments. Rev….
Continue Reading
-
This magnetic breakthrough could make AI 10x more efficient
The rapid rise in AI applications has placed increasingly heavy demands on our energy infrastructure. All the more reason to find energy-saving solutions for AI hardware. One promising idea is the use of so-called spin waves to process…
Continue Reading
-
Physics – Photonic Spin Textures
• Physics 18, s91
An arrangement of spins known as a meron turns out to be easier to make in momentum space than in real space.
A skyrmion is a region where the orientation of a vector field—such as a magnet’s spin…
Continue Reading
-
Lasers capture the invisible dance of wind and waves
The international team, led by Dr. Marc Buckley from the Hereon Institute of Coastal Ocean Dynamics, has achieved a breakthrough in high-resolution imaging of the ocean surface. Using a specially developed laser measurement system aboard the…
Continue Reading
-
First-principles diagrammatic Monte Carlo for electron–phonon interactions and polaron
Fröhlich, H. Electrons in lattice fields. Adv. Phys. 3, 325 (1954).
Google Scholar
Holstein, T. Studies of polaron motion: part II. The ‘small’ polaron. Ann. Phys. 8, 343 (1959).
Continue Reading
-
Waveform-controlled field synthesis of sub-two-cycle pulses at the 100 TW peak power level
System infrastructure
The set-up of the Light Wave Synthesizer 100 (LWS100) is shown in Fig. 1. It starts with the first part of the front end, a Pharos pump laser (Light Conversion), including a 75-MHz mode-locked Yb:KGW (potassium gadolinium…
Continue Reading
-
Study of payload calculation and motion prediction for unpowered diving and floating of deep-sea manned submersible
Hypothesis
The research work is carried out in the context of engineering applications. The hypothesis for simplified calculation is given in literature21, as follows:
-
1.
…
Continue Reading
-
1.