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Phonon softening and electron-phonon coupling in the topological nodal-line semimetal ZrGeSe

Physical Review Materials 2024年第3期8卷 034201-034201页

作者： Weiyao Zhao Enamul Haque Lei Guo David Cortie Lei Chen Bahadir Salmankurt Xiaolin Wang Ren-Kui Zheng Nikhil V. Medhekar Julie Karel Kirrily C. Rule Institute for Superconducting and Electronic Materials and ARC Centre of Excellence in Future Low-Energy Electronics Technologies University of Wollongong Wollongong New South Wales 2500 Australia Department of Materials Science and Engineering and ARC Centre of Excellence in Future Low-Energy Electronics Technologies Monash University Clayton Victoria 3800 Australia School of Physics Southeast University Nanjing 211189 China School of Physics University of Wollongong Wollongong New South Wales 2522 Australia Australian Nuclear Science and Technology Organisation Lucas Heights New South Wales 2234 Australia School of Physics and Materials Science Guangzhou University Guangzhou 510006 China Distance Education Center Sakarya University of Applied Sciences Sakarya 54001 Turkey

ZrGeSe is one of the most well-known topological nodal-line semimetals, which possesses linearly dispersive electronic bands near the Fermi surface. However, the lattice-dynamics study and its interaction with the electronic system have not been investigated. We employed the inelastic neutron-scattering method to study the lattice dynamics of ZrGeSe single crystals. The measured acoustic phonon dispersions were compared with lattice-dynamics calculations, with an overall good agreement with theory; however, both the longitudinal and the transverse acoustic phonon dispersions along the (q00) directions demonstrate significant softening, unexpectedly in contrast with the theoretical predictions. Complementary ab initio molecular dynamics simulations indicate an anomalous temperature dependency in the vibrational spectroscopy. We show that strong electron-phonon coupling exists along the Γ-M−X directions and argue that the phonon softening is induced by such electron-phonon coupling.

关键词： Topological materials First-principles calculations Inelastic neutron scattering

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Effects of reflection distance on Richtmyer–Meshkov instability in the reshock process: A discrete Boltzmann study

arXiv

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arXiv 2025年

作者： Lai, Huilin Lin, Chuandong Li, Demei Yang, Tao Gan, Yanbiao Lian, Lingyan Xu, Aiguo Fujian Normal University Fuzhou350117 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai519082 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Beijing100084 China Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle School of Liberal Arts and Sciences North China Institute of Aerospace Engineering Langfang065000 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P. O. Box 8009-26 Beijing100088 China National Key Laboratory of Shock Wave and Detonation Physics Mianyang621999 China HEDPS Center for Applied Physics and Technology College of Engineering Peking University Beijing100871 China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing100081 China

The Richtmyer–Meshkov (RM) instability occurs when a perturbed interface between two fluids undergoes impulsive acceleration due to a shock wave. In this paper, a numerical investigation of the RM instability during the reshock process is conducted using the two-component discrete Boltzmann method. The influence of reflection distance on the RM instability, including both hydrodynamic and thermodynamic non-equilibrium effects, is explored in detail. The interaction time between the reflected shock wave and the material interface varies with different reflection distances. Larger reflection distances lead to a longer evolution time of the material interface before reshock, resulting in more complex effects on the interface deformation, the mixing extent of the fluid system, and non-equilibrium behaviors after reshock. Additionally, while the reflection distance has a minimal impact on mixing entropy before the secondary impact, a significant difference emerges after the secondary impact. This suggests that the secondary impact enhances the evolution of the RM instability. Furthermore, non-equilibrium behaviors or quantities exhibit complex dynamics due to the influence of the transmitted shock wave, transverse waves, rarefaction waves, material interfaces, and dissipation/diffusion processes. Copyright © 2025, The Authors. All rights reserved.

关键词： Shock waves

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Development of vacuum ultraviolet spectroscopy for measuring edge impurity emission in the EAST tokamak

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Plasma science and Technology 2020年第8期22卷 8-13页

作者： Hongming ZHANG Bo LYU Liang HE Yongcai SHEN Jun CHEN Jia FU Bin BIN Xunyu WANG Fudi WANG Yingying LI Ling ZHANG Bing LIU Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China School of Nuclear Science and Technology University of South ChinaHengyang 421001People's Republic of China School of Physics and Electrical Engineering Anqing Normal UniversityAnqing 246011People's Republic of China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwestern Jiaotong UniversityChengdu 610031People's Republic of China

The dominant wavelength range of edge impurity emissions moves from the visible range to the vacuum ultraviolet(VUV)range,as heating power increasing in the Experimental Advanced Superconducting Tokamak(EAST).The measurement provided by the existing visible spectroscopies in EAST is not sufficient for impurity transport studies for high-parameters ***,in this study,a VUV spectroscopy is newly developed to measure edge impurity emissions in *** Seya-Namioka VUV spectrometer(McPherson 234/302)is used in the system,equipped with a concave-corrected holographic grating with groove density of 600 grooves *** line emissions can be observed in the wavelength range ofλ=50-700 nm,covering VUV,near ultraviolet and visible *** observed vertical range is Z=-350-350 *** minimum sampling time can be set to 5 ms under full vertical binning(FVB)*** spectroscopy has been used to measure the edge impurity emission for the 2019 EAST experimental *** spectra are identified for several impurity species,i.e.,lithium(Li),carbon(C),oxygen(O),and iron(Fe).Several candidates for tungsten(W)lines are also measured but their clear identification is very difficult due to a strong overlap with Fe *** evolutions of impurity carbon emissions of CⅡat 134.5 nm and CⅢat 97.7 nm are analyzed to prove the system capability of time-resolved *** measurements of the VUV spectroscopy are very helpful for edge impurity transport study in the high-parameters plasma in EAST.

关键词： EAST tokamak impurity tungsten vacuum ultraviolet spectroscopy edge impurity emission plasma diagnostics

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Automated control and optimization of laser-driven ion acceleration

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High Power Laser science and engineering 2023年第3期11卷 32-40页

作者： B.Loughran M.J.V.Streeter H.Ahmed S.Astbury M.Balcazar M.Borghesi N.Bourgeois C.B.Curry S.J.D.Dann S.DiIorio N.P.Dover T.Dzelzainis O.C.Ettlinger M.Gauthier L.Giuffrida G.D.Glenn S.H.Glenzer J.S.Green R.J.Gray G.S.Hicks C.Hyland V.Istokskaia M.King D.Margarone O.McCusker P.McKenna Z.Najmudin C.Parisuaña P.Parsons C.Spindloe D.R.Symes A.G.R.Thomas F.Treffert N.Xu C.A.J.Palmer School of Mathematics and Physics Queen’s University BelfastBelfastUK Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUK Gérard Mourou Center for Ultrafast Optical Science University of MichiganAnn ArborMIUSA SLAC National Accelerator Laboratory Menlo ParkCAUSA Department of Electrical and Computer Engineering University of AlbertaEdmontonABCanada The John Adams Institute for Accelerator Science Imperial College LondonLondonUK ELI Beamlines Centre Institute of PhysicsCzech Academy of SciencesDolníBˇrežanyCzech Republic Department of Applied Physics Stanford UniversityStanfordCAUSA Department of Physics SUPAUniversity of StrathclydeGlasgowUK Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic Department of Mechanical Engineering Stanford UniversityStanfordCAUSA Institut für Kernphysik Technische Universität DarmstadtDarmstadtGermany

The interaction of relativistically intense lasers with opaque targets represents a highly non-linear,multi-dimensional parameter *** limits the utility of sequential 1D scanning of experimental parameters for the optimization of secondary radiation,although to-date this has been the accepted methodology due to low data acquisition *** repetition-rate(HRR)lasers augmented by machine learning present a valuable opportunity for efficient source ***,an automated,HRR-compatible system produced high-fidelity parameter scans,revealing the influence of laser intensity on target pre-heating and proton generation.A closed-loop Bayesian optimization of maximum proton energy,through control of the laser wavefront and target position,produced proton beams with equivalent maximum energy to manually optimized laser pulses but using only 60%of the laser *** demonstration of automated optimization of laser-driven proton beams is a crucial step towards deeper physical insight and the construction of future radiation sources.

关键词： Bayesian optimization high repetition-rate laser-target interaction laser-driven particle acceleration proton generation

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Extended Tool for Nanoparticles Incorporation Evaluation from Hyperspectral Images of Cultured Cells

Extended Tool for Nanoparticles Incorporation Evaluation fro...

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International Conference on Semiconductor

作者： Ionela Nicoleta Irimescu Mihaela Deaconu Daniela Berger Nicolae Tarba Cosmin Catalin Mustaciosu Diana Iulia Savu Roxana-Cristina Popescu Eugen Scarlat Mona Mihailescu Simona Ioniță Ana Maria Pleava Applied Sciences Doctoral School National University of Science and Technology Politehnica Bucharest Medist Imaging & Point of Care Bucharest Romania CAMPUS Research Institute National University of Science and Technology Politehnica Bucharest Romania Department of Inorganic Chemistry Physical Chemistry & Electrochemistry National University of Science and Technology Politehnica Bucharest Romania Computer Sciences Doctoral School Physics Department National University of Science and Technology Politehnica Bucharest Romania Department of Life and Environmental Sciences “Horia Hulubei” National Institute for Research and Development in Physics and Nuclear Engineering Magurele Romania Department of Bioengineering and Biotechnology Faculty of Medical Engineering Politehnica Bucharest Romania Physics Department National University for Science and Technology Politehnica Bucharest Bucharest Romania Physics Department Fundamental Sciences Applied in Engineering Research Center CAMPUS Research Center Politehnica University Bucharest Romania Chemical Engineering Doctoral School National University of Science and Technology Politehnica Bucharest Romania CAMPUS Research Center U. N. S. T. National University of Science and Technology Politehnica Bucharest Romania

ISBN: (数字)9798350352078

ISBN: (纸本)9798350352085

Hyperspectral images of cultured cells incubated with mesoporous silica-based nanoparticles (NPs) functionalized with phenylboronic acid derivative and loaded with doxorubicin and resveratrol were analyzed to establish incorporation percentage. We designed and developed a digital tool, which extended the standard procedure, by combining spectral angle mapper with assisted segmentation and counting operations. It provides the percentage of pixels in which the spectral fingerprint of the NPs is found. The analysis is carried out at the cell level and points out the similarities and differences between cell lines and types of NPs.

关键词： Nanoparticles Image segmentation Microscopy Cells (biology) Fingerprint recognition Fibroblasts Breast cancer Mesoporous materials Standards Hyperspectral imaging

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Nobility vs Mobility: Unlocking New Insights Into Molten Salt Corrosion Mechanisms of High Entropy Alloys with High-Throughput Experiments and Machine Learning-Enabled Analysis

SSRN

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SSRN 2023年

作者： Goh, Bonita Wang, Yafei Nelaturu, Phalgun Moorehead, Michael Duong, Thien Priya, Pikee Thoma, Dan Chaudhuri, Santanu Hattrick-Simpers, Jason Sridharan, Kumar Couet, Adrien Department of Engineering Physics University of Wisconsin-Madison WI53706 United States Department of Materials Science and Engineering University of Wisconsin-Madison WI53706 United States Departmentof Civil Materials and Environmental Engineering University of Illinois Chicago60607 United States Applied Materials Division Argonne National Laboratory United States Department of Materials Science and Engineering University of Toronto ONM5S 1A1 Canada School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

Corrosion of alloys in molten salts is commonly understood from thermodynamics: the higher the noble elements’ content in the alloy, the more corrosion-resistant the alloy is expected to be. Here we present an example in the CrFeMnNi compositionally complex space that defy this conventional intuition.. Machine learning-facilitated analysis of the extensive data set reveals that molten salt corrosion in this system is primarily predicted by the Ni mobility within the alloy. This discovery was made possible using high-throughput manufacturing and testing of a set of 110 compositionally complex alloys within the CrFeMnNi element space prepared by additive manufacturing in-situ alloying processes and corrosion-tested in standardized conditions of temperature and chlorine potential. A standardized, parametric data set of this magnitude for corrosion in molten salts is a first of its kind resulting in new insights into the corrosion mechanism of FeCrMnNi for clean energy enabling technologies. © 2023, The Authors. All rights reserved.

关键词： Manganese alloys

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Femtosecond Laser Combined with Hydrothermal Method to Construct Three-Dimensional Spatially Distributed Wurtzite Zno Micro/Nano-Structures to Enhance Photocatalytic Properties

SSRN

引用

SSRN 2023年

作者： He, Yaowen Yang, Junhui Wang, Yun Jiang, Jiayao Wang, Jialu Tao, Haiyan Yang, Ying Wang, Tianqi Lin, Jingquan Dong, Xiangting School of Physics Changchun University of Science and Technology Changchun130022 China Nuclear Power Institute of China Chengdu610213 China Key Laboratory of Applied Chemistry and Nanotechnology Universities of Jilin Province Changchun University of Science and Technology Changchun130022 China Zhongshan Institute Changchun University of Science and Technology Zhongshan528637 China School of Chemistry and Environmental Engineering China

Conventional approaches employing nanopowder particles or deposition photocatalytic nanofilm materials encounter challenges such as performance instability, susceptibility to detachment, and recycling complications in practical photocatalytic scenarios. In this study, a novel fabrication strategy is proposed that uses femtosecond laser direct writing of self-sourced metal to prepare a self-supporting micro-structure substrate, and combines the hydrothermal method to construct a three-dimensional spatially distributed metal oxide micro/nano-structure. The obtained wurtzite ZnO micro/nano-structure has excellent wetting properties while obtaining a larger specific surface area, and can achieve effective adsorption of methyl orange molecules. Moreover, the tight integration of ZnO with the surface interface of the self-sourced metal micro-structure substrate will facilitates efficient charge transfer. Simultaneously, it improves the efficiency of light utilization (absorption) and the number of active sites in the photocatalytic process, ultimately leading to excellent photodegradation stability. This result provides an innovative technology solution for achieving efficient semiconductor surface-interface photocatalytic performance and stability. © 2023, The Authors. All rights reserved.

关键词： Zinc oxide

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Cross-system biological image quality enhancement based on the generative adversarial network as a foundation for establishing a multi-institute microscopy cooperative network

arXiv

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arXiv 2024年

作者： Panek, Dominik Rząca, Carina Szczypior, Maksymilian Sorysz, Joanna Misztal, Krzysztof Baster, Zbigniew Rajfur, Zenon Doctoral School of Exact and Natural Sciences Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland Department of Molecular and Interfacial Biophysics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30‑348 Poland Undergraduate Program in Biophysics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30‑348 Poland Undergraduate program in Biomedical Engineering Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Al. A. Mickiewicza 30 Building B-1 Kraków30-059 Poland Division of Computational Mathematics Faculty of Mathematics and Computer Science Jagiellonian University 6 Lojasiewicza St. Kraków Poland

High-quality fluorescence imaging of biological systems is limited by processes like photobleaching and phototoxicity, and also in many cases, by limited access to the latest generations of microscopes. Moreover, low temporal resolution can lead to a motion blur effect in living systems. Our work presents a deep learning (DL) generative-adversarial approach to the problem of obtaining high-quality (HQ) images based on their low-quality (LQ) equivalents. We propose a generative-adversarial network (GAN) for contrast transfer between two different separate microscopy systems: a confocal microscope (producing HQ images) and a wide-field fluorescence microscope (producing LQ images). Our model proves that such transfer is possible, allowing us to receive HQ-generated images characterized by low mean squared error (MSE) values, high structural similarity index (SSIM), and high peak signal-to-noise ratio (PSNR) values. For our best model in the case of comparing HQ-generated images and HQ-ground truth images, the median values of the metrics are 6·10-4, 0.9413, and 31.87, for MSE, SSIM, and PSNR, respectively. In contrast, in the case of comparison between LQ and HQ ground truth median values of the metrics are equal to 0.0071, 0.8304, and 21.48 for MSE, SSIM, and PSNR respectively. Therefore, we observe a significant increase ranging from 14% to 49% for SSIM and PSNR respectively. These results, together with other single-system cross-modality studies, provide proof of concept for further implementation of a cross-system biological image quality enhancement. © 2024, CC BY-SA.

关键词： Fluorescence imaging

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Dynamic Time-Over-Threshold Readout for Improved Energy Linearity in PET Detectors that Achieve 100 ps CTR

Dynamic Time-Over-Threshold Readout for Improved Energy Line...

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2021 IEEE nuclear science Symposium and Medical Imaging Conference, NSS/MIC 2021

作者： Pourashraf, Shirin Gonzalez-Montoro, Andrea Cates, Joshua W. Zhao, Zhixiang Won, Jun Yeon Sung Lee, Jae Levin, Craig S. Stanford University Department of Radiology StanfordCA94305 United States Berkeley National Laboratory Applied Nuclear Physics Program at Lawrence BerkeleyCA94720 United States Shanghai Jiao Tong University School of Biomedical Engineering Shanghai China Seoul National University Department of Nuclear Medicine and Biomedical Sciences Seoul110-744 Korea Republic of Stanford University Molecular Imaging Program Departments of Radiology Bioengineering Physics and Electrical Engineering StanfordCA94305 United States

ISBN: (纸本)9781665421133

We have embedded a dynamic time-over-threshold (DynTOT) block in our scalable TOF-PET detector readout electronics to linearize the multiplexed energy spectra while keeping 100 ps FWHM Coincidence Time Resolution (CTR) performance. This DynTOT block is constructed by off-the-shelve components and consumes only 20 mW power per detector 'layer' in our design. Using 3×3×10 mm3 "LGSO"crystals coupled to arrays of 3×3 mm² SiPMs, energy resolution of 13.8±0.1%, 13.9±0.3%, and 17.1±0.6% were experimentally achieved for conventional pulse height, DynTOT, and conventional TOT methods, respectively. Including the DynTOT method, coincidence data were experimentally acquired using a low jitter FPGA-based TDC, and 103.6 ± 1.1 ps FWHM CTR was achieved, demonstrating the robustness of our novel and scalable timing electronic chain. © 2021 IEEE.

关键词： Medical imaging

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Design Considerations for 3D Position Sensitive Scintillation Detectors that Achieve 100 ps Coincidence Time Resolution

Design Considerations for 3D Position Sensitive Scintillatio...

引用

2021 IEEE nuclear science Symposium and Medical Imaging Conference, NSS/MIC 2021

作者： Pourashraf, Shirin Zhao, Zhixiang Gonzalez-Montoro, Andrea Cates, Joshua W. Yeon Won, Jun Sung Lee, Jae Levin, Craig S. Stanford University Department of Radiology StanfordCA94305 United States Shanghai Jiao Tong University School of Biomedical Engineering Shanghai China Lawrence Berkeley National Laboratory Applied Nuclear Physics Program BerkeleyCA94720 United States Seoul National University Department of Nuclear Medicine and Biomedical Sciences Seoul110-744 Korea Republic of Stanford University Molecular Imaging Program Departments of Radiology Bioengineering Physics and Electrical Engineering StanfordCA94305 United States

ISBN: (纸本)9781665421133

We have studied design considerations for three dimension positioning sensitive (3DPS) scalable TOF- PET detectors that achieve 100 ps coincidence time resolution (CTR). These scintillation detectors are based on 3×3×10 mm3 'LGSO' crystals side- coupled to arrays of 3×3 mm2 SiPMs. A CPLD is used to provide 3 mm positioning resolution along the length of each crystal element. Revised mixed-signal front-end electronics decreased the power dissipation by 200% and increased the detector packing fraction while preserving the CTR performance. A low timing jitter FPGA-based TDC was used for data acquisition of the timing channels. Measured CTR was 102.2 ± 1.3 ps FWHM using a 22Na point source. © 2021 IEEE.

关键词： Data acquisition

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