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Polar vortex hidden in twisted bilayers of paraelectric SrTiO.
Nat Commun
December 2024
School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
Polar topologies, such as vortex and skyrmion, have attracted significant interest due to their unique physical properties and promising applications in high-density memory devices. To date, all known polar vortices are present in or induced by ferroelectric materials. In this study, we find polar vortex arrays in paraelectric SrTiO.
View Article and Find Full Text PDFCurrent-vortex-sheet model of the magnetic Rayleigh-Taylor instability.
Phys Rev E
November 2024
School of Mathematics and Physics, Gangneung-Wonju National University, Gangneung 25457, South Korea.
This study investigates the Rayleigh-Taylor instability in the magnetic field applied parallel to the interface. The motion of the interface is described using a current-vortex-sheet model. The growth rate of the interface is obtained from a linear stability analysis of the model.
View Article and Find Full Text PDFInfluence of Left Subclavian Artery Stent Graft Geometry on Blood Hemodynamics in Thoracic Endovascular Aortic Repair.
J Biomech Eng
February 2025
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Nanshan District, Shenzhen 518055, China.
The objective of this research is to analyze the hemodynamic differences in five configurations of left subclavian artery (LSA) stent grafts after LSA endovascular reconstruction in thoracic endovascular aortic repair (TEVAR). For numerical simulation, one three-dimensional thoracic aortic geometry model with an LSA stent graft retrograde curved orientation was reconstructed from post-TEVAR computed tomography angiography (CTA) images, and four potential LSA graft configurations were modified and reconstructed: three straight (0, 2, and 10 mm aortic extension) and one anterograde configuration. The blood perfusion of the LSA, flow field, and hemodynamic wall parameters were analyzed.
View Article and Find Full Text PDFTemporally deuterogenic plasmonic vortices.
Nanophotonics
March 2024
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK 74078, USA.
Article Synopsis
- - Over the last ten years, there has been growing interest in plasmonic vortices, which are linked to orbital angular momentum and play a key role in light-matter interactions and plasmonic spin-orbit coupling.
- - Traditional methods of studying these vortices in the frequency domain lack detailed insights into their evolution, prompting a new investigation into a unique vortex mode that is only observable in the time domain.
- - The study demonstrates that this temporally varying vortex can be manipulated through design and specific light beams, enhancing our understanding of plasmonic spin-orbit coupling and offering new strategies for optical control in future research.
Plasmonic-nanowire near-field beam analyzer.
Nanophotonics
March 2024
Laboratory of Integrated Opto-Mechanics and Electronics, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
Article Synopsis
- Experimental near-field analysis of output beams from micro/nano-waveguides is crucial for designing nanophotonic devices, yet it hasn’t been demonstrated until now.
- The study introduces a plasmonic-nanowire beam analyzer using a single Au nanowire to scan near-field distributions, achieving a resolution of 190 nm and a collection efficiency of about 47.4%.
- This novel approach enables the first 3D characterization of spatial distributions from a metal nanowire output beam and showcases the ability to analyze complex multimodes in large nanoribbons, indicating potential applications in nanolasers and biosensing.
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