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Magnetotransport properties and Shubnikov–de Haas oscillations in a type-II nodal-line semimetal candidate n-type Mg3Bi2 single crystal

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Physical Review B 2025年第7期111卷 075163-075163页

作者： Yosuke Goto Masayuki Murata Hidetomo Usui Keigo Ono Joseph P. Heremans Taichi Terashima Chul-Ho Lee National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8568 Japan Department of Applied Physics Shimane University Matsue 690-8504 Japan Department of Applied Physics and Physico-Informatics Faculty of Science and Technology Keio University Yokohama Kanagawa 223-8522 Japan Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA Research Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Tsukuba Ibaraki 305-0003 Japan

Mg3Bi2 is a candidate type-II nodal-line semimetal (a novel category of topological semimetals). However, the exotic transport properties of Mg3Bi2 single crystals are yet to be elucidated. Herein, we report the magnetotransport properties of an n-type Mg3Bi2 single crystal grown from a melt. The results revealed that the single crystal exhibited a very large, nonsaturating magnetoresistance (5000%) under an 8-T field, significantly exceeding that of polycrystals. The combined analysis of Shubnikov–de Haas (SdH) oscillations, Hall resistivity, and first-principles calculations suggest that SdH oscillations originate from trivial electron bands rather than hole bands, which contain an almost linear dispersion. We confirmed that the electron mobility reached 10 000 cm2/Vs by analyzing Hall resistivity and magnetoresistance based on a two-band model. The electron/hole concentration and mobility were used to investigate the measured transport properties, such as the Nernst coefficient. Overall, these results are critical for elucidating the electronic structure and transport properties of Mg3Bi2.

关键词： Hole concentration

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Long-range photodetection of organic exciton-polaritons

Long-range photodetection of organic exciton-polaritons

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CLEO: Science and Innovations, S and I 2022

作者： Liu, Bin Huang, Xinjing Forrest, Stephen R. Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Material Science and Engineering University of Michigan Ann ArborMI48109 United States

In light-matter strong coupling regime, we observe long-range photodetection response at room temperature mediated by organic exciton-polaritons, which results from strong interactions between organic excitons and low... 详细信息

ISBN: (纸本)9781557528209

关键词： Excitons

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Parametric oscillation of electromagnetic waves in momentum band gaps of a spatiotemporal crystal

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Photonics Research 2021年第2期9卷 142-150页

作者： SEOJOO LEE JAGANG PARK HYUKJOON CHO YIFAN WANG BRIAN KIM CHIARA DARAIO BUMKI MIN Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Mechanical Engineering and Applied Physics California Institute of TechnologyPasadenaCalifornia 91125USA

Photonic crystals have revolutionized the field of optics with their unique dispersion and energy band gap engineering capabilities, such as the demonstration of extreme group and phase velocities, topologically protected photonic edge states, and control of spontaneous emission of photons. Time-variant media have also shown distinct functionalities, including nonreciprocal propagation, frequency conversion, and amplification of ***, spatiotemporal modulation has mostly been studied as a simple harmonic wave function. Here, we analyze time-variant and spatially discrete photonic crystal structures, referred to as spatiotemporal *** design of spatiotemporal crystals allows engineering of the momentum band gap within which parametric amplification can occur. As a potential platform for the construction of a parametric oscillator, a finite-sized spatiotemporal crystal is proposed and analyzed. Parametric oscillation is initiated by the energy and momentum conversion of an incident wave and the subsequent amplification by parametric gain within the momentum band gap. The oscillation process dominates over frequency mixing interactions above a transition threshold determined by the balance between gain and loss. Furthermore, the asymmetric formation of momentum band gaps can be realized by spatial phase control of the temporal modulation, which leads to directional radiation of oscillations at distinct frequencies. The proposed structure would enable simultaneous engineering of energy and momentum band gaps and provide a guideline for implementation of advanced dispersion-engineered parametric oscillators.

关键词： momentum oscillation crystal

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Structural, electronic and optical properties of ZnO and TiO 2 nanoparticles for wastewater treatment: A first-principles study

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Materials Today: Proceedings 2023年 92卷 928-932页

作者： Santosh Singh Madhvendra Nath Tripathi P. Reddy Prasad B.D.Y. Sunil Department of Physics Institute of Aeronautical Engineering Dundigal Hyderabad-500 500 043 Telengana India Department of Pure & Applied Physics Guru Ghasidas Vishwavidyalaya Bilaspur-495 009 Chhattisgarh India Department of Chemistry Institute of Aeronautical Engineering Dundigal Hyderabad-500 043 Telengana India Department of Mechanical Engineering Institute of Aeronautical Engineering Dundigal Hyderabad-500 043 Telengana India

Water quality deteriorates when industrial and human activities increase. This means that toxins must be removed from industrial and domestic wastewater. In the context of nanotechnology, anchoring TiO 2 and ZnO nanoparticles on clay has also been shown to be potential sequesters and has been examined for wastewater treatment. This paper presents a thorough investigation of the structural, electronic, and optical features of ZnO & TiO 2 nanoparticles using the GGA-PBE functional within the framework of density functional theory (DFT). For ZnO and TiO 2 nanoparticles, there is excellent agreement between the calculated lattice parameters and the findings of the experiments. Electronic structure calculations confirm that both ZnO and TiO 2 are semiconducting in nature. The density of states calculation reveals that the conduction band in TiO 2 is primarily derived from hybridization between Ti-3d states and O-2p states, whereas the valence band is derived from mixing between Ti-3d and O-2p states. Further, ZnO, O-2p, and Zn-3d states, primarily contributed to the valence band, while Zn-4 s and Zn-3p states mainly contributed to the conduction band. Since drinking water disinfection processes frequently involve ultraviolet (UV) absorption based advanced oxidation process . Investigations of the optical properties of these two materials suggest that ZnO and TiO 2 show great potential as strong UV-absorbing and photocatalytic materials, and can be utilized as microbial disinfectants during wastewater treatment.

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Development of the Al2O3-B2O3-SiO2 glass for thermal barrier coating

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Journal of Non-Crystalline Solids 2024年 626卷

作者： Qiu, Jun-Yan Montecillo, Rhys Chen, Pin-Yi Tu, Chi-Shun Chen, Cheng-Sao Fu, Ben-Ran Feng, Kuei-Chih International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City24301 Taiwan Department of Mechanical Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Department of Physics Fu Jen Catholic University New Taipei City24205 Taiwan Department of Mechanical Engineering Hwa Hsia University of Technology New Taipei City23530 Taiwan Department of Mechanical Engineering National Chiao Tung University Hsinchu City30010 Taiwan

Glass coating is an important thermal insulation technique used in the aerospace industry that serves as a thermal protection system (TPS) to protect the inner layer at elevated temperatures. This work highlights the superb mechanical and thermal properties of the B2O3-SiO2 glass systems as a surface coating for space shuttle. In the B2O3-SiO2 system, the glass transition temperature raises from 650 °C to 750 °C with increasing SiO2 content and devitrification of the α-cristobalite phase. The Al2O3 addition in B2O3-SiO2 glass can increase the glass transition temperature from 750 °C to 1000 °C and inhibit the α-cristobalite phase. The phase transition from an unstable α-cristobalite phase to an amorphous phase was achieved at 10 wt% Al2O3-added specimens. This study demonstrates that the Al2O3-B2O3-SiO2 glass (ABS glass) exhibits thermally stable behavior, making it an effective thermal barrier coating at elevated temperatures. © 2023

关键词： Silica

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Solid solution strengthening of high-entropy alloys from first-principles study

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Journal of Materials Science & Technology 2022年第26期121卷 105-116页

作者： H.L.Zhang D.D.Cai X.Sun H.Huang S.Lu Y.Z.Wang Q.M.Hu L.Vitos X.D.Ding State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China Department of Materials Science and Engineering The Ohio State University2041 College RoadColumbusOH 43210United States Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden

Solid solution strengthening(SSS)is one kind of strengthening mechanisms and plays an important role in alloy design,in particular for single-phase alloys including high-entropy alloys(HEAs).The classical Labusch–Nabarro model and its expansions are most widely applicable to treating SSS of solid solution alloys including both conventional alloys(CAs)and *** this study,the SSS effects in a series of Febased CAs and HEAs are investigated by using the classical Labusch–Nabarro model and its *** size misfit and shear modulus misfit parameters are derived from first-principles *** on available experimental data in combination with empirical SSS model,we propose fitting constants(i.e.,the ratio between experimental hardness and predicted SSS effect)for these two families of *** predicted host/alloy family-dependent fitting constants can be used to estimate the hardness of these SSS *** agreement between predicted and measured hardness values is satisfactory for both CAs and HEAs,implying that the proposed approach is reliable and successful.

关键词： Alloys Solid solution strengthening Hardness Size misfit parameter Shear modulus misfit parameter First-principles calculations

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Non-Hermitian metasurface for asymmetric thermal emission

Non-Hermitian metasurface for asymmetric thermal emission

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Prasad, Ciril S. Everitt, Henry O. Naik, Gururaj V. Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States U.S. Army DEVCOM Army Research Laboratory-South HoustonTX United States

ISBN: (纸本)9781957171258

Non-Hermitian optics provides a unique platform to take advantage of absorption losses in materials and control radiative properties. We demonstrate a non-Hermitian metasurface that exhibit directional suppression of thermal radiation while maintaining transmission in mid-infrared. © Optica Publishing Group 2023 © 2023 The Author(s)

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Long-range order of polygonal grain boundaries

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Physical Review B 2025年第4期111卷 045103-045103页

作者： N. Sarkar P. R. Bandaru R. C. Dynes Department of Mechanical Engineering University of California San Diego La Jolla California 92093-0411 USA Program in Materials Science University of California San Diego La Jolla California 92093-0411 USA Department of Physics University of California San Diego La Jolla California 92093-0411 USA

Atomic-scale spatial resolution was achieved in the mapping and spectroscopy of polygonal grain boundaries (GBs) on atomically flat highly oriented pyrolytic graphite using scanning tunneling microscopy (STM). These GBs are long-range ordered one-dimensional periodic structures comprising pentagon-heptagon pairs. A comprehensive study combining local electronic, valleytronic, mechanical, and topological properties is conducted on this GB which reveals the interplay between these properties. On the atoms and bonds of individual GB polygons, spatially localized conductance states were probed, in addition to edge states. The spatial extent of these states was observed on GB by bias-dependent imaging. The electron scattering angle at the GB edges was also modulated with a sample bias which exhibited valley flipping and unique quantum interference effects such as backscattering and intervalley scattering. In situ strain-induced mechanical and electronic modifications were observed through surface deformation caused by the STM tip, revealing flattened electronic energy band dispersion and shifts in carrier doping.

关键词： Grain boundaries

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General framework for the mechanical response of metallic glasses during strain-rate-dependent uniaxial compression

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Physical Review Materials 2023年第10期7卷 105604-105604页

作者： Weiwei Jin Amit Datye Udo D. Schwarz Mark D. Shattuck Corey S. O'Hern Department of Mechanical Engineering and Materials Science Yale University New Haven Connecticut 06520 USA Department of Chemical and Environmental Engineering Yale University New Haven Connecticut 06520 USA Benjamin Levich Institute and Physics Department The City College of New York New York New York 10031 USA Department of Physics Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA Graduate Program in Computational Biology and Bioinformatics Yale University New Haven Connecticut 06520 USA

Experimental data on compressive strength σmax versus strain rate ɛ̇eng for metallic glasses undergoing uniaxial compression show varying strain rate sensitivity. For some metallic glasses, σmax decreases with increasing ɛ̇eng, while for others, σmax increases with increasing ɛ̇eng, and for certain alloys σmax versus ɛ̇eng is nonmonotonic. To understand their strain rate sensitivity, we conduct molecular dynamics simulations of metallic glasses undergoing uniaxial compression at finite strain rates and coupled to heat baths with a range of temperatures T0 and damping parameters b. In the T0→0 and b→0 limits, we find that the compressive strength σmax versus temperature T obeys a “chevron-shaped” scaling relation. In the low-strain-rate regime, σmax decreases linearly with increasing T, whereas σmax grows as a power law with decreasing T in the high-strain-rate regime. For T0>0, σmax(T) deviates from the scaling curve at low strain rates, but σmax(T) rejoins the scaling curve as the strain rate increases. Enhanced dissipation reduces compression-induced heating, which causes σmax(T) to deviate from the b→0 scaling behavior for intermediate strain rates, but σmax(T) converges to the high-strain-rate power-law scaling behavior at sufficiently high strain rates. Determining σmax(T) as a function of b and T0 provides a general framework for explaining the strain rate sensitivity of metallic glasses under compression.

关键词： Compressive strength mechanical deformation Amorphous materials Metallic glasses Molecular dynamics

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Setpoint Tracking and Disturbance Attenuation for Gas Pipeline Flow Subject to Uncertainties using Backstepping

arXiv

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arXiv 2024年

作者： Rathnayake, Bhathiya Zlotnik, Anatoly Tokareva, Svetlana Diagne, Mamadou Department of Electrical and Computer Engineering University of California San Diego United States Applied Mathematics and Plasma Physics Group Los Alamos National Laboratory United States Department of Mechanical and Aerospace Engineering University of California San Diego United States

In this paper, we consider the problem of regulating the outlet pressure of gas flowing through a pipeline subject to uncertain and variable outlet flow. Gas flow through a pipe is modeled using the coupled isothermal Euler equations, with the Darcy-Weisbach friction model used to account for the loss of gas flow momentum. The outlet flow variation is generated by a periodic linear dynamic system, which we use as a model of load fluctuations caused by varying customer demands. We first linearize the nonlinear equations around the equilibrium point and obtain a 2×2 coupled hyperbolic partial differential equation (PDE) system expressed in canonical form. Using an observer-based PDE backstepping controller, we demonstrate that the inlet pressure can be manipulated to regulate the outlet pressure to a setpoint, thus compensating for fluctuations in the outlet flow. Furthermore, we extend the observer-based controller to the case when the outlet flow variation is uncertain within a bounded set. In this case, the controller is also capable of regulating the outlet pressure to a neighborhood of the setpoint by manipulating the inlet pressure, even in the presence of uncertain fluctuations in the outlet flow. We provide numerical simulations to demonstrate the performance of the *** Codes 93C20, 76N25, 93D15 © 2024, CC BY.

关键词： Backstepping

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