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Giant topological Hall effect in centrosymmetric tetragonal Mn2−xZnxSb

Physical Review B 2021年第17期104卷 174419-174419页

作者： Md Rafique Un Nabi Aaron Wegner Fei Wang Yanglin Zhu Yingdong Guan Arash Fereidouni Krishna Pandey Rabindra Basnet Gokul Acharya Hugh O. H. Churchill Zhiqiang Mao Jin Hu Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Department of Chemistry Missouri State University Springfield Missouri 65897 USA Department of Physics Pennsylvania State University University Park Pennsylvania 16802 USA Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA

Topological magnetism typically appears in noncentrosymmetric compounds or compounds with geometric frustration. Here, we report the effective tuning of magnetism in centrosymmetric tetragonal Mn2−xZnxSb by Zn substitution. The magnetism is found to be closely coupled to the transport properties, giving rise to a very large topological Hall effect with fine-tuning of Zn content, which even persists to high temperature (∼250K). The further magnetoentropic analysis suggests that the topological Hall effect is possibly associated with topological magnetism. Our finding suggests Mn2−xZnxSb is a candidate material for a centrosymmetric tetragonal topological magnetic system, offering opportunities for studying and tuning spin textures and developing near room temperature spin-based devices.

关键词： Frustrated magnetism Skyrmions Topological Hall effect Ferrimagnets Topological materials

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Terahertz Time-Domain Spectroscopy for Probing DC Conductivity of Single-Layer Graphene

Terahertz Time-Domain Spectroscopy for Probing DC Conductivi...

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Western New York Image Processing Workshop (WNYIPW)

作者： Debamitra Chakraborty Declan Walden Jing Cheng Julia Wallace Kiryl A. Niherysh Andrei V. Felsharuk Donats Erts Ivan Komissarov Roman Sobolewski Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics Rochester New York USA Department of Physics and Astronomy University of Rochester Rochester New York USA Department of Biomedical Engineering University of Rochester Rochester New York USA Institute of Chemical Physics University of Latvia Riga Latvia Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Department of Electrical and Computer Engineering University of Rochester Rochester New York USA

We report preliminary results of extracting electrical parameters like DC conductivity, mobility, and carrier concentration of single-layer graphene using Terahertz time-domain spectroscopy (THz-TDS) in transmission geometry. We utilize a simple Drude model and its extension, the Drude-Smith model, capable of accommodating charge carrier scattering by optical and acoustic phonons to describe the complex conductivity in graphene. We observed that a significant area of the sample scanned followed the Drude-Smith behavior, while at a few locations, the simple Drude behavior prevailed. We identified possible reasons that might contribute to this observation, like defects, the presence of polymer residue on the sample, or the sample strain. This research sheds new light on our understanding of graphene's electrical properties and lays the foundation for future investigations addressing defects and contaminants in graphene samples.

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Parameter-free differential evolution algorithm for the analytic continuation of imaginary time correlation functions

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Physical Review E 2022年第2期106卷 025312-025312页

作者： Nathan S. Nichols Paul Sokol Adrian Del Maestro Data Science and Learning Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Physics University of Vermont Burlington Vermont 05405 USA Materials Science Program University of Vermont Burlington Vermont 05404 USA Department of Physics Indiana University Bloomington Indiana 47408 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee Knoxville Tennessee 37996 USA

We report on differential evolution for analytic continuation: a parameter-free evolutionary algorithm to generate the dynamic structure factor from imaginary time correlation functions. Our approach to this long-standing problem in quantum many-body physics achieves enhanced spectral fidelity while using fewer compute (CPU) hours. The need for fine-tuning of algorithmic control parameters is eliminated by embedding them within the genome to be optimized for this evolutionary computation-based algorithm. Benchmarks are presented for models where the dynamic structure factor is known exactly and experimentally relevant results are included for quantum Monte Carlo simulations of bulk He4 below the superfluid transition temperature.

关键词： Nonequilibrium statistical mechanics Helium-4 superfluids Genetic algorithm Neutron scattering Numerical techniques Path-integral Monte Carlo Quantum Monte Carlo

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Thermal Degradation of Pan Fibers Modified with Hydrazine Hydrate and Strontium Ions

SSRN

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SSRN 2023年

作者： Cabral, Aluisio A. Soares, Drielle N.N. Júnior, Carlos A.R.B. Serbena, Francisco Carlos Postgraduate Program in Materials Engineering Federal Institute of Maranhão – IFMA MA São Luis65030-001 Brazil Department Aerospace Engineering Federal University of Maranhão – UFMA MA São Luís65080-805 Brazil Department of Physics State University of Ponta Grossa – UEPG PR Ponta Grossa84030-000 Brazil Department of Physics DEFIS Federal Institute of Maranhão – IFMA MA São Luís65030-001 Brazil

In this work, we added strontium ions to hydrolyzed PAN fibers to improve their thermal resistance. For comparison, we characterized hydrolyzed non-modified (PAN-H) and strontium-modified PAN fibers (PAN-H-Sr) by several techniques, such as XRD, FTIR, TG, DSC, and SEM. Our XRD diffractograms demonstrated that PAN-H-Sr was more crystalline, while the FTIR spectra confirmed that PAN textile fiber underwent hydrolysis by breaking nitrile group bonds, incorporating the refractory cation into the fiber through the O – Sr – O bond. SEM micrographs showed that the width of the PAN-H-Sr fiber decreased, and a stiffer structure was obtained. The TG and DSC analysis indicated that PAN-H-Sr presented higher thermal stability since the presence of strontium delayed the degradation reactions of PAN, with no visible melting of the material, and at the end of the heat treatment, exposed a more significant residual mass equivalent to 48.55%. © 2023, The Authors. All rights reserved.

关键词： Fourier transform infrared spectroscopy

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Landau Polaritons in a Full-Dielectric Three-Dimensional Photonic-Crystal Cavity

Landau Polaritons in a Full-Dielectric Three-Dimensional Pho...

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CLEO: Science and Innovations, S and I 2022

作者： Tay, Fuyang Mojibpour, Ali Liang, Shuang Baydin, Andrey Ahmadivand, Arash Peraca, Nicolas Marquez Xu, Hongjing Gardner, Geoff C. Manfra, Michael J. Hagenmüller, David Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Microsoft Quantum Purdue Purdue University West LafayetteIN47907 United States School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States School of Materials Engineering Purdue University West LafayetteIN47907 United States Université de Strasbourg CNRS Strasbourg67000 France Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

ISBN: (纸本)9781557528209

We fabricated a full-dielectric three-dimensional photonic-crystal cavity containing an ultrahigh-mobility two-dimensional electron gas. By applying a strong perpendicular magnetic field, we created Landau polaritons originating from the ultrastrong coupling of electrons with cavity modes. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Polariton

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Large-scale structure with superhorizon isocurvature dark energy

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Physical Review D 2022年第8期105卷 083531-083531页

作者： Koki Yamashita Yue Nan Yuuki Sugiyama Kazuhiro Yamamoto Department of Physics Kyushu University Motooka 744 Fukuoka 819-0395 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-hiroshima 739-8526 Japan Kavli Institute for the Physics and Mathematics of the Universe (WPI) The University of Tokyo Institutes for Advanced Study The University of Tokyo Kashiwa Chiba 277-8583 Japan Research Center for Advanced Particle Physics Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan

The standard cosmological model assumes a homogeneous and isotropic universe as the background spacetime on large scales called the cosmological principle. However, some observations suggest the possibility of an inhomogeneous and anisotropic universe at large scales. In this paper, we investigate a model of the Universe with random inhomogeneities and anisotropies on very large scales, motivated by the supercurvature dark energy model in Nan et al. [Phys. Rev. D 99, 103512 (2019)]. In this model, the authors introduced a scalar field with O(1) inhomogeneities on a scale sufficiently larger than the current horizon scale (superhorizon scale), and the potential energy of the scalar field explains the accelerating expansion, with slight deviations from the cosmological principle. We aim at clarifying the theoretical prediction on the large-scale structure (LSS) of the matter component in this model. Based on the work on the superhorizon scale fluctuations (superhorizon mode) presented in Y. Nan and K. Yamamoto [Phys. Rev. D 105, 063518 (2022)], we derive the equations that the perturbative components to the LSS obey as a generalization of the cosmological perturbations theory, which is solved to find the influence of the dark energy inhomogeneities on the formation of the LSS. Finally, we show that the model can be consistent with observations by comparing the σ8 predicted by the numerical solution of the model with the σ8 indicated by observations such as Planck and the Sloan Digital Sky Survey.

关键词： Cosmology Dark energy Evolution of the Universe Large scale structure of the Universe

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Geophysical investigation for engineering construction assessment in Karst

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physics AND CHEMISTRY OF THE EARTH 2023年 129卷

作者： [Anonymous] [a]Program of Geology Department of Earth Sciences and Environment Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Malaysia [b]School of Chemical and Energy Engineering Faculty of Engineering Teknologi Malaysia 81310 Skudai Johor Malaysia [c]Geo Technology Resources Sdn. Bhd (1174319 - P) 31-1 Jalan Mawar 5B Taman Mawar 43900 Sepang Selangor Malaysia [d]Geophysics Unit School of Physics Universiti Sains Malaysia 11800 Pulau Pinang Malaysia

A geophysical survey involving electrical resistivity imaging was carried out in various parts of Perak state, Malaysia, to assess the risk of establishing engineering structures in a karst system. The area is underlain by the Palaeozoic Kinta limestone bedrock. A total of 9 survey lines were established on the proposed sites. The data collected from the survey areas was processed and subjected to computer iteration to simulates physical models of the most common karstic features in the area. The study results are remarkably vital in evaluating weathered zones and hard limestone bedrock, as well as in locating infiltrated water and cavities beneath them. This study emphasized the significance of geophysical surveys for foundation investigation because they can properly assess the competence of subsurface physical properties.

关键词： Electrical resistivity imaging Induced polarization Karst Perak Peninsular Malaysia

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Silicon–metal and silicon–silicon ultrafast laser welding with domesticated filaments 17

Silicon–metal and silicon–silicon ultrafast laser welding ...

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Laser-based Micro- and Nanoprocessing XVII 2023

作者： Chambonneau, Maxime Li, Qingfeng Blothe, Markus Fedorov, Vladimir Yu. Tzortzakis, Stelios Nolte, Stefan Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Straße 15 Jena07745 Germany Science Program Texas A&M University at Qatar P.O. Box 23874 Doha Qatar P.O. Box 1527 HeraklionGR-71110 Greece Materials Science and Technology Department University of Crete Heraklion71003 Greece Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 Jena07745 Germany

ISBN: (纸本)9781510659230

We demonstrate for the first time ultrafast laser welding in the silicon–metal and silicon–silicon configurations, with focused infrared picosecond pulses. This achievement relies on accurate characterizations of filamentation in silicon with nonlinear propagation imaging. In the silicon–metal configuration, precompensating for the nonlinear focal shift prior to the welding yields bonding strengths > 1 MPa. By combining this filament relocation technique with metallic nanolayer deposition at the interface to exalt the energy deposition, similar bonding strength values are obtained in the silicon–silicon configuration. © 2023 SPIE.

关键词： Silicon

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Improving dynamic collision frequencies: impacts on dynamic structure factors and stopping powers in warm dense matter

arXiv

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arXiv 2023年

作者： Hentschel, Thomas W. Kononov, Alina Olmstead, Alexandra Cangi, Attila Baczewski, Andrew D. Hansen, Stephanie B. School of Applied & Engineering Physics Cornell University IthacaNY United States Center for Computing Research Sandia National Laboratories AlbuquerqueNM United States Nanoscience and Microsystems Engineering Program University of New Mexico AlbuquerqueNM United States Center for Advanced Systems Understanding Helmholtz-Zentrum Dresden-Rossendorf Görlitz Germany Department of Physics and Astronomy University of New Mexico AlbuquerqueNM United States Pulsed Power Sciences Center Sandia National Laboratories AlbuquerqueNM United States

Simulations and diagnostics of high-energy-density plasmas and warm dense matter rely on models of material response properties, both static and dynamic (frequency-dependent). Here, we systematically investigate variations in dynamic electron-ion collision frequencies ν(ω) in warm dense matter using data from a self-consistent-field average-atom model. We show that including the full quantum density of states, strong collisions, and inelastic collisions lead to significant changes in ν(ω). These changes result in red shifts and broadening of the plasmon peak in the dynamic structure factor, an effect observable in x-ray Thomson scattering spectra, and modify stopping powers around the Bragg peak. These changes improve the agreement of computationally efficient average-atom models with first-principles time-dependent density functional theory in warm dense aluminum, carbon, and deuterium. © 2023, CC BY.

关键词： Quantum theory

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High throughput intracellular delivery facilitated by acoustofluidics 24

High throughput intracellular delivery facilitated by acoust...

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24th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2020

作者： Salari, Alinaghi Appak-Baskoy, Sila Coe, Imogen R. Abousawan, John Antonescu, Costin N. Tsai, Scott S.H. Kolios, Michael C. Canada Biomedical Engineering Graduate Program Ryerson University Canada Department of Chemistry and Biology Ryerson University Canada Molecular Science Graduate Program Ryerson University Canada Department of Mechanical and Industrial Engineering Ryerson University Canada Department of Physics Ryerson University Canada

ISBN: (纸本)9781733419017

Many cell-based therapies rely on the successful delivery of cargo materials into cells. Here, we present a novel in vitro strategy for intracellular delivery, which is based on adherent cells exposed to acoustic waves. Strong acoustic waves mediated through a substrate inside a microfluidic channel cause the adherent cells to oscillate. As a result of continuous cell oscillation and cell-induced microstreaming, successful delivery of different size dextrans into MDA-MB-231 cells (with delivery efficiencies of 55-85%) is demonstrated. This novel acoustofluidic method achieves rapid and scalable delivery of cargo materials into cells and thus may be preferred over lipofection, electroporation, or other delivery methods. © 2020 CBMS-0001

关键词： Cells

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