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Ferroelectric Semimetals with α−Bi/SnSe van der Waals Heterostructures and Their Topological Currents

Physical Review Letters 2024年第14期133卷 146605页

作者： D. J. P. de Sousa Seungjun Lee Qiangsheng Lu Rob G. Moore Matthew Brahlek J.-P. Wang Guang Bian Tony Low Department of Electrical and Computer Engineering Materials Science and Technology Division Department of Physics Department of Physics and Astronomy

We show that proximity effects can be utilized to engineer van der Waals heterostructures (vdWHs) displaying semimetallic spin-ferroelectricity locking, where ferroelectricity and semimetallic spin states are confined to different layers, but are correlated by means of proximity effects. Our findings are supported by first principles calculations involving α−Bi/SnSe bilayers. We show that such systems support ferroelectrically switchable nonlinear anomalous Hall effect originating from large Berry curvature dipoles as well as direct and inverse spin Hall effects with giant bulk spin-charge interconversion efficiencies. The giant efficiencies are consequences of the proximity-induced semimetallic nature of low energy electron states, which are shown to behave as two-dimensional pseudo-Weyl fermions by means of symmetry analysis and first principles calculations as well as direct angle-resolved photoemission spectroscopy measurements.

关键词： Edge states Electrical generation of spin carriers Electronic structure Ferroelectricity First-principles calculations Spin current Spin generation Spin-orbit coupling Topological materials Valley degrees of freedom 2-dimensional systems Weyl semimetal Angle-resolved photoemission spectroscopy

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Facile fabrication of highly flexible,porous PEDOT:PSS/SWCNTs films for thermoelectric applications

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Chinese physics B 2022年第2期31卷 50-59页

作者： Fu-Wei Liu Fei Zhong Shi-Chao Wang Wen-He Xie Xue Chen Ya-Ge Hu Yu-Ying Ge Yuan Gao Lei Wang Zi-Qi Liang College of Physics and Electronic Engineering Xinyang Normal UniversityXinyang 464000China Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Department of Materials Science Fudan UniversityShanghai 200433China

High-performance organic composite thermoelectric(TE)materials are considered as a promising alternative for harvesting heat ***,composite films of poly(3,4-ethyienedioxythiophene):poly(styrene sulfonate)/single-walled carbon nanotubes(PEDOT:PSS/SWCNTs)were fabricated by utilizing a convenient solution mixing ***,the as-prepared hybrid films were treated using sulfuric acid(H_(2)SO_(4))to further optimize the TE *** morphological studies revealed that the sulfuric acid treated PEDOT:PSS/SWCNTs composite samples all possessed porous *** to the successful fabrication of highly conductive networks,the porous nano-architecture also exhibited much more excellent TE properties when compared with the dense structure of the pristine *** the post-treated sample,a high power factor of 156.43μW·m^(-1)·K^(-2)can be achieved by adjusting the content of CNTs,which is approximately 3 orders of magnitude higher than that of the corresponding untreated samples(0.23μW·m^(-1)·K^(-2)).Besides,the obtained films also showed excellent mechanical flexibility,owing to the porous nanostructure and the strong p–p interactions between the two *** work indicates that the H_(2)SO_(4) treatment could be a promising strategy for fabricating highly-flexible and porous PEDOT:PSS/SWCNTs films with high TE performances.

关键词： porous film thermoelectric properties flexibility

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Revealing microstructural evolution and mechanical properties of resistance spot welded NiTi-stainless steel with Ni or Nb interlayer

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Journal of materials science & Technology 2024年第13期180卷 160-173页

作者： K.Zhang A.Shamsolhodaei A.Ghatei-Kalashami J.P.Oliveira C.Zang N.Schell J.Li A.R.H.Midawi J.G.Lopes J.Yan P.E.J.Rivera-Díaz-del-Castillo P.Peng Y.N.Zhou Department of Mechanical and Mechatronics Engineering University of Waterloo200 University Avenue WestWaterlooONN2L 3G1Canada CENIMAT/I3N Department of Materials ScienceNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516CaparicaPortugal Materials Research Group Department of Mechanical EngineeringUniversity of SouthamptonSouthamptonSO171BJUK Helmholtz-Zentrum Hereon Institute of Materials PhysicsMax-Planck-Str.1Geesthacht21502Germany UNIDEMI Department of Mechanical and Industrial EngineeringNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516CaparicaPortugal

Dissimilar welding of NiTi and stainless steel(SS)for multifunctional device fabrication is challenging due to the brittle nature of intermetallic compounds(IMCs)that are formed in the weld *** this work,Ni and Nb interlayers were applied for the resistance spot welding(RSW)of NiTi and SS to replace the harmful Fe_(2)Ti phase and to restrict the mixing of dissimilar molten metals,*** evolution and mechanical properties of the joints were *** was shown that a conventional weld nugget was created in the absence of any interlayer in the welded joint suffering from traversed cracks due to the formation of brittle IMCs network in the fusion zone(FZ).By the addition of Ni from the interlayer,Fe_(2)Ti dominated weld nugget was efficaciously replaced by Ni_(3)Ti phase;however,the presence of the large pore and cracks reduced the effective joining *** use of a Nb interlayer resulted in a fundamentally different joint,in which FZs at NiTi and SS sides separated by the unmolten Nb would suppress the mixing of dissimilar molten ***-containing eutectic structures with low brittleness formed at the interfaces,contributing to the enhancement of joint strength(increased by 38%on fracture load and 460%on energy absorption).A high-melting-point interlayer showed great potential to realize a reliable and high-performing RSWed NiTi-SS joint.

关键词： NiTi Stainless steel Resistance spot welding Intermetallic compounds Mechanical properties

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Dynamical chiral Nernst effect in twisted Van der Waals few layers

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Quantum Frontiers 2024年第1期3卷 1-7页

作者： Li, Juncheng Zhai, Dawei Xiao, Cong Yao, Wang New Cornerstone Science Laboratory Department of Physics The University of Hong Kong HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong Institute of Applied Physics and Materials Engineering University of Macau

The Nernst effect is a fundamental thermoelectric conversion phenomenon that was deemed to be possible only in systems with magnetic field or magnetization. In this work, we propose a novel dynamical chiral Nernst effect that can appear in two-dimensional van der Waals materials with chiral structural symmetry in the absence of any magnetic degree of freedom. This unconventional effect is triggered by time variation of an out-of-plane electric field, and has an intrinsic quantum geometric origin linked to not only the intralayer center-of-mass motion but also the interlayer coherence of electronic states. We demonstrate the effect in twisted homobilayer and homotrilayer transition metal dichalcogenides, where the strong twisted interlayer coupling leads to sizable intrinsic Nernst conductivities well within the experimental capacity. This work suggests a new route for electric control of thermoelectric conversion. © The Author(s) 2024.

关键词： AC out-of-plane electric field Chiral structure Nernst Effect Quantum geometric quantity Twisted transition metal dichalcogenides

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High strength mullite-bond SiC porous ceramics fabricated by digital light processing

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Journal of Advanced Ceramics 2024年第1期13卷 53-62页

作者： Jian Sun Jingde Zhang Xu Zhang Zihe Li Jianzhang Li Sijie Wei Weibin Zhang Weili Wang Guifang Han Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Key Laboratory of Special Functional Aggregated Materials Ministry of EducationShandong UniversityJinan 250100China Materials and Structures Research Centre Department of Mechanical EngineeringUniversity of BathBath BA27AYUK National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology Xi’an Golden Mountain Ceramic Composites Co.Ltd.Xi’an 710118China School of Physics and Materials Science Changji UniversityChangji 831100China

Fabricating SiC ceramics via the digital light processing(DLP)technology is of great challenge due to strong light absorption and high refractive index of deep-colored SiC powders,which highly differ from those of resin,and thus significantly affect the curing performance of the photosensitive SiC *** this paper,a thin silicon oxide(SiO_(2))layer was in-situ formed on the surface of SiC powders by pre-oxidation *** method was proven to effectively improve the curing ability of SiC *** SiC photosensitive slurry was fabricated with solid content of 55 vol%and viscosity of 7.77 Pa·s(shear rate of 30 s^(−1)).The curing thickness was 50μm with exposure time of only 5 ***,a well-designed sintering additive was added to completely convert low-strength SiO_(2) into mullite reinforcement during *** mullite-bond SiC ceramics were successfully *** flexural strength of SiC ceramics sintered at 1550℃in air reached 97.6 MPa with porosity of 39.2 vol%,as high as those prepared by spark plasma sintering(SPS)techniques.

关键词： digital light processing(DLP) SiC ceramics pre-oxidation mullite-bond SiC mechanical properties

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Performance limit prediction of atomically thin In2O3 transistors

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science China(Information sciences) 2025年第4期68卷 399-400页

作者： Zongmeng YANG Shibo FANG Linqiang XU Qiuhui LI Jichao DONG Ying LI Baochun WU Mughira GHAFOOR Peiqi YANG Ying GUO Shimin HOU Zhaochu LUO Jing LU State Key Laboratory for Mesoscopic Physics and School of Physics Peking University State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Center for Nanoscale Science and Technology Key Laboratory for the Physics and Chemistry of NanodevicesDepartment of Electronics Peking University School of Materials Science and Engineering Xi'an University of Technology School of Physics and Telecommunication Engineering Shaanxi Key Laboratory of CatalysisShaanxi University of Technology Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MEMD) Peking University Collaborative Innovation Center of Quantum Matter Peking University Yangtze Delta Institute of Optoelectronics Key Laboratory for the Physics and Chemistry of Nanodevices Peking University Beijing Key Laboratory of Quantum Devices Peking University

Moore's law requires the downscaling of metal oxide semiconductor field effect transistors（MOSFETs） for future integrated circuits（ICs） development. The performance of Si-based MOSFETs becomes insufficient to meet the standards outlined in the international technology roadmap for semiconductors（ITRS） due to short-channel effects as the channel length shrinks below 10 nm [1]. Ultrathin thin In2O3films with atomically smooth surfaces have recently been fabricated using atomic layer deposition（ALD） [2].

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Monodisperse micro-spherical Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+)red phosphors

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Journal of Rare Earths 2022年第4期40卷 526-533,I0001页

作者： Jiannan Jia Mengting He Jun Wan Yuting Zhang Hai Guo Xianping Fan Xusheng Qiao Shiguo Chen Department of Physics Zhejiang Normal UniversityJinhua 321004China State Key Laboratory of Silicon Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China

With narrow red photoluminescence (PL) bands, tetravalent Mn^(4+) doped phosphors show promising prospect in commercial application to effectively expand color gamut of phosphor converted LED displays. Here, we report a type of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) phosphors with regular cage-like micro-spherical morphologies. The micron size spherical precursors were synthesized with a propylene oxide (PO) driven fast sol–gel method. The cage -like spherical morphology is beneficial to efficiently trapping much incident light to enhance the PL of the phosphors. Being calcined at 1300 ℃, Sr_(2)MgAl_(21.978)O_(36):0.022Mn^(4+) only exhibits the internal quantum efficiency (IQE) of 24.91%. With the Mg^(2+)-Mn^(4+) codoping and Y^(3+)/Sr^(2+) substituting strategies, to fulfill charge balance and produce John-Teller distortion, IQE of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) can be further improved up to 36.45%. The CIE color coordinates of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) under near ultraviolet excitation can be stably fixed to (0.723, 0.227) at deep red region. It thus finds a potential application as pc-LED display with much broader color gamut than that of the NTSC standard. Therefore, Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) micron size spheres can be employed as promising red phosphors for high performance LED displays.

关键词： Mn^(4+) Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36) LED phosphor Cage-like micro-sphere Luminescence Rare earths

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Microstructural analysis and nonlinear optical properties of PP/PA6/Clay composites: a comparative study with and without compatibilizer

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Optical and Quantum Electronics 2025年第5期57卷 1-27页

作者： Orshesh, Z. Dehghani, Z. Moghaddasi, M. Bagheri, R. Abrinaei, F. Department of Materials Science and Engineering Ahvaz Branch Islamic Azad University Ahvaz Iran Department of Materials Science and Engineering Central Tehran Branch Islamic Azad University Tehran Iran Department of Physics University of Neyshabur P. O. Box *** Neyshabur Iran National Key Laboratory on Near-Surface Detection School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Department of Materials Science and Engineering Sharif University of Technology P. O. Box 11365-9466 Tehran Iran Department of Physics Central Tehran Branch Islamic Azad University Tehran Iran Department of Physics East Tehran Branch Islamic Azad University Tehran Iran

Ternary polypropylene/polyamide6/organoclay composites were successfully synthesized through a melt-mixing process, with and without a compatibilizer. The chemical-bond, structural, and morphological characteristics of composites were thoroughly investigated utilizing Fourier-transform infrared spectroscopy, wide-angle X-ray diffraction, and scanning electron microscopy analyses. The morphological investigations showed that the addition of a compatibilizer to the composite leads to a reduction in the size of the dispersed PA6/clay domains and a decrease in the distance between them due to the formation of a PP-g-PA copolymer at the interface, which improves compatibility between the PP and PA6 phases. Furthermore, the differential scanning calorimetry technique was employed to assess the crystallization and thermal action of the composites. The results revealed that the addition of a compatibilizer resulted in a slight increase in the crystallization temperature of PP and a reduction in the overall crystallinity of the composite, attributed to the compatibilizer’s interaction with both the clay and PA6/clay islands, limiting PP chain mobility and hindering crystallization. The band gap energies were determined in a range of 4.17–4.34 eV by diffuse reflectance spectroscopy and utilizing the Tauc method. Notably, this study marks the first instance of exploring the nonlinear optical properties of these composites. This was achieved by employing Z-scan technique by subjecting the samples to a continuous-wave Nd:YAG laser functioning at a wavelength of 532 nm. A positive nonlinearity of the order of 10–8 cm2W−1 was observed across all samples studied. Particularly noteworthy was the significant enhancement in nonlinear refractive index and absorption coefficients for polypropylene/polyamide6/organoclay ternary composites upon the addition of the compatibilizer. These findings strongly indicate the potential of these composites for applications in nonlinear optical devic

关键词： Fourier transform infrared spectroscopy

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Design and Performance of Al-based Ultraviolet Communication Film 15

Design and Performance of Al-based Ultraviolet Communication...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Teng, Ma Xiangy, Luo Jingb, Wang Jiaq, Gao Yali, Zhao Department of Materials Science and Engineering Jinzhong University Shanxi Jinzhong030619 China Department of Physics and Electronic Engineering Jinzhong University Shanxi Jinzhong030619 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

In view of the requirements of ultraviolet (UV) communication for high UV transmittance in the solar blind area and inhibition of other bands, the G|(Al/MgF2)s periodic film structure composed of Al and MgF2 was designed in this paper. TFCalc was used to investigate the influence rule of single-layer metal film thickness on its transmittance and the influence of G|(Al/MgF2)s period number on its transmittance. Then, the structure of G|(Al/MgF2)s was optimized, and the period number was found to be 3. When the film was Al (10 nm)/MgF2 (60 nm)/Al (10 nm)/MgF2 (60 nm)/Al (10 nm)/MgF2 (37 nm), the transmittance in the band of 212–233 nm was greater than 60%, and the peak transmission value was 72.09%. The cutoff of visible light and near-infrared light is up to 2.8 OD. The communication film has a cutoff similar to the metal Al with the same thickness, but the UV transmittance is increased by 65%. When the incidence angle increases, the transmittance peak has a blue shift and decreases accordingly. © 2024 SPIE.

关键词： Blue shift

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Elasto-inertial focusing and particle migration in high aspect ratio microchannels for highthroughput separation

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Microsystems & Nanoengineering 2024年第3期10卷 381-394页

作者： Selim Tanriverdi Javier Cruz Shahriar Habibi Kasra Amini Martim Costa Fredrik Lundell Gustaf Mårtensson Luca Brandt Outi Tammisola Aman Russom Division of Nanobiotechnology Department of Protein ScienceScience for Life LaboratoryKTH Royal Institute of TechnologySolna 17165Sweden Division of Microsystems Technology Department of Materials Science and EngineeringUppsala UniversityUppsala 75237Sweden FLOW and SeRC(Swedish e-Science Research Centre) Department of Engineering MechanicsRoyal Institute of TechnologyStockholm SE 10044Sweden FLOW and Fluid Physics Laboratory Department of Engineering MechanicsRoyal Institute of TechnologyStockholmSweden Wallenberg Wood Science Center Royal Institute of TechnologyStockholm SE 10044Sweden Department of Energy and Process Engineering Norwegian University of Science and Technology(NTNU)TrondheimNorway AIMES Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology StockholmSweden

The combination of flow elasticity and inertia has emerged as a viable tool for focusing and manipulating particles using *** there is considerable interest in the field of elasto-inertial microfluidics owing to its potential applications,research on particle focusing has been mostly limited to low Reynolds numbers(Re<1),and particle migration toward equilibrium positions has not been extensively *** this work,we thoroughly studied particle focusing on the dynamic range of flow rates and particle migration using straight microchannels with a single inlet high aspect *** initially explored several parameters that had an impact on particle focusing,such as the particle size,channel dimensions,concentration of viscoelastic fluid,and flow *** experimental work covered a wide range of dimensionless numbers(0.05

关键词： particle separation straight

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