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Two-step electronic response to magnetic ordering in a van der Waals ferromagnet

Physical Review B 2024年第4期109卷 045416-045416页

作者： Han Wu Jian-Xin Zhu Lebing Chen Matthew W. Butcher Ziqin Yue Dongsheng Yuan Yu He Ji Seop Oh Bin Gao Jianwei Huang Shan Wu Cheng Gong Yucheng Guo Sung-Kwan Mo Jonathan Denlinger Donghui Lu Makoto Hashimoto Matthew B. Stone Alexander I. Kolesnikov Songxue Chi Junichiro Kono Andriy H. Nevidomskyy Robert J. Birgeneau Pengcheng Dai Ming Yi Department of Physics and Astronomy and Rice Center for Quantum Materials Rice University Houston Texas 77005 USA Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of California at Berkeley Berkeley California 94720 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Department of Applied Physics Yale University New Haven Connecticut 06511 USA Department of Electrical and Computer Engineering and Quantum Technology Center University of Maryland College Park Maryland 20742 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Material Science and Nanoengineering Rice University Houston Texas 77005 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA

The two-dimensional material Cr2Ge2Te6 is a member of the class of insulating van der Waals (vdW) magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets.

关键词： Electronic structure Magnetic order Magnetic phase transitions Van der Waals systems Angle-resolved photoemission spectroscopy

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Preparation of a New Hybrid Mgalldh@Magnetite Activated Charcoal by Hydrothermal Method for Stability and Adsorption Mechanism of Congo Red

SSRN

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SSRN 2024年

作者： Ahmad, Nur Kameda, Tomohito Rahman, Mir Tamzid Rahman, Farzana Lesbani, Aldes Graduate School of Mathematics and Natural Science FMIPA Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia Research Center of Inorganic Materials and Complexes Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia Graduate School of Environmental Studies Tohoku University 6-6-20 Aoba Aramaki Aobaku Sendai980-8579 Japan Department of Chemistry Jahangirnagar University Dhaka Savar1342 Bangladesh Department of Nutrition and Food Engineering Daffodil International University Birulia1216 Bangladesh Master Program of Material Science Graduate School of Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia

Background The removal of hazardous dyes from water by magnetic adsorbents has received significant interest due to their low cost and ease of separation from the solution phase. This study explores the efficacy of a novel hybrid adsorbent, magnetite and activated charcoal-modified MgAl layered double hydroxide (MgAlLDH@MAC), for removing congo red (CR) from aqueous solutions. Methods MgAlLDH@MAC was successfully prepared via a co-precipitation to hydrothermal method and characterized using FE-SEM, FE-STEM, VSM, BET, XRD, FTIR, XPS, and HPLC analysis. Significant findings The incorporation of magnetite and activated charcoal was successful, resulting in excellent adsorption performance for CR and easy separation from the solution due to its magnetic properties. The adsorbent achieved a maximum adsorption capacity of 625 mg/g, which is in line with the Langmuir isotherm and pseudo-second-order kinetic model. Moreover, the adsorbent demonstrated excellent stability and reusability, retaining 91.78% efficiency after five adsorption-desorption. This study offers a fresh viewpoint on creating high-performance LDH adsorbents that remove dyes quickly and effectively using carbon and magnetite materials. © 2024, The Authors. All rights reserved.

关键词： Magnetite

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Layer-dependent optically-induced spin polarization in InSe

arXiv

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arXiv 2022年

作者： Nelson, Jovan Stanev, Teodor K. Lebedev, Dmitry LaMountain, Trevor Tyler Gish, J. Zeng, Hongfei Shin, Hyeondeok Heinonen, Olle Watanabe, Kenji Taniguchi, Takashi Hersam, Mark C. Stern, Nathaniel P. Applied Physics Program Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Department of Material Science & Engineering Northwestern University EvanstonIL60208 United States Computational Science Division Argonne National Laboratory LemontIL60439 United States Material Science Division Argonne National Laboratory LemontIL60439 United States Research Center for Functional Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Department of Chemistry Northwestern University EvanstonIL60208 United States Department of Electrical Engineering and Computer Science Northwestern University EvanstonIL60208 United States

Optical control of spin in semiconductors has been pioneered using nanostructures of III-V and II-VI semiconductors, but the emergence of two-dimensional van der Waals materials offers an alternative low-dimensional platform for spintronic phenomena. Indium selenide (InSe), a group-III monochalcogenide van der Waals material, has shown promise for opto-electronics due to its high electron mobility, tunable direct bandgap, and quantum transport. In addition to these confirmed properties, there are predictions of spin-dependent optical selection rules suggesting potential for all-optical excitation and control of spin in a two-dimensional layered material. Despite these predictions, layer-dependent optical spin phenomena in InSe have yet to be explored. Here, we present measurements of layer-dependent optical spin dynamics in few-layer and bulk InSe. Polarized photo-luminescence reveals layer-dependent optical orientation of spin, thereby demonstrating the optical selection rules in few-layer InSe. Spin dynamics are also studied in many-layer InSe using time-resolved Kerr rotation spectroscopy. By applying out-of-plane and in-plane static magnetic fields for polarized emission measurements and Kerr measurements, respectively, the g-factor for InSe was extracted. Further investigations are done by calculating precession values using a k·p model, which is supported by ab-initio density functional theory. Comparison of predicted precession rates with experimental measurements highlights the importance of excitonic effects in InSe for understanding spin dynamics. Optical orientation of spin is an important prerequisite for opto-spintronic phenomena and devices, and these first demonstrations of layer-dependent optical excitation of spins in InSe lay the foundation for combining layer-dependent spin properties with advantageous electronic properties found in this material. Copyright © 2022, The Authors. All rights reserved.

关键词： Spin dynamics

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A Mitochondrion-Targeting Two-Photon Photosensitizer with Aggregation-Induced Emission Characteristics for Hypoxia-Tolerant Photodynamic Therapy

SSRN

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SSRN 2022年

作者： Jiang, Yihang Zhu, Wei Xu, Zhourui Zhang, Zhijun Tang, Shuo Fan, Miaozhuang Li, Zhengzheng Zhang, Jianyu Yang, Chengbin Law, Wing-Cheung Yong, Ken-Tye Wang, Dong Xu, Gaixia Tang, Ben Zhong Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging School of Biomedical Engineering Health Science Center Shenzhen University Guangdong Shenzhen518055 China Centre for AIE Research Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional Materials College of Material Science and Engineering Shenzhen University Guangdong Shenzhen518055 China Key Laboratory of Advanced Textile Materials and Manufacturing Technology Engineering Research Center for Eco-Dyeing & Finishing of Textiles Ministry of Education Zhejiang Sci-Tech University Hangzhou310018 China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Institute for Advanced Study The Hong Kong University of Science and Technology Clear Water Bay Kowloon999077 Hong Kong Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Hum Kowloon999077 Hong Kong School of Biomedical Engineering The University of Sydney SydneyNSW2006 Australia MOE Key Laboratory of Macromolecular Synthesis and Functionalization China

In recent years, two-photon photodynamic therapy (TP-PDT) has received extensive attention in cancer treatment owing to its unique advantages of deep tissue penetration and high spatial-temporal controls. However, the high oxygen dependency of photosensitizers still remained as the major obstacle which undermined its overall therapeutic efficacy, especially in hypoxic-tolerant tumors. Exploration of new TP-PDT strategy with less-oxygen-dependency and subcellular organelle-targeting ability is an appealing yet seriously challenging task. In this work, a mitochondrion-targeting TP-PDT protocol based on type-I PSs with aggregation-induced emission (AIE) characteristics is proposed for the first time. Of the two synthesized AIE-active PSs, TPABP-Ir is demonstrated superior reactive oxygen species (ROS) production (both type I&II) owing to the doping of Ir(III). After encapsulation into bovine serum albumin (BSA) matrix, TPABP-Ir@BSA nanoparticles (Ir-NPs) are capable of realizing mitochondrion-targeting, high ROS production, and suppression of tumor growth under 880 nm femtosecond laser excitation. This study provides a novel treatment strategy which maximizes the PDT efficacy and offers a conceptual but practical paradigm for cancer treatment in translational nanomedicine. © 2022, The Authors. All rights reserved.

关键词： Diseases

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Deep-Strong Coupling between Cavity Photons and Terahertz TO Phonons in PbTe

Deep-Strong Coupling between Cavity Photons and Terahertz TO...

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Baydin, Andrey Manjappa, Manukumara Mishra, Sobhan Subhra Xu, Hongjing Tay, Fuyang Kim, Dasom Hernandez, Felix G.G. Rappl, Paulo H.O. Abramof, Eduardo Singh, Ranjan Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Instrumentation and Applied Physics Department Indian Institute of Science Bangalore560012 India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 639798 Singapore Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Instituto de Física Universidade de Sao Paulo SP Sao Paulo05508-090 Brazil Laboratorio Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais SP Sao Jose dos Campos12201-970 Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

We have investigated the resonant coupling of photons with TO phonons in lead telluride in small-mode-volume terahertz cavities, observing a giant vacuum Rabi splitting on the order of the bare cavity-phonon frequency... 详细信息

ISBN: (纸本)9781957171258

关键词： Photons

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Simulation-trained machine learning models for Lorentz transmission electron microscopy

APL Machine Learning

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APL Machine Learning 2024年第2期2卷

作者： Arthur R. C. McCray Alec Bender Amanda Petford-Long Charudatta Phatak Material Science Division Argonne National Laboratory Lemont Illinois 60439 USA Applied Physics Program Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA

Understanding the collective behavior of complex spin textures, such as lattices of magnetic skyrmions, is of fundamental importance for exploring and controlling the emergent ordering of these spin textures and inducing phase transitions. It is also critical to understand the skyrmion–skyrmion interactions for applications such as magnetic skyrmion-enabled reservoir or neuromorphic computing. Magnetic skyrmion lattices can be studied using in situ Lorentz transmission electron microscopy (LTEM), but quantitative and statistically robust analysis of the skyrmion lattices from LTEM images can be difficult. In this work, we show that a convolutional neural network, trained on simulated data, can be applied to perform segmentation of spin textures and to extract quantitative data, such as spin texture size and location, from experimental LTEM images, which cannot be obtained manually. This includes quantitative information about skyrmion size, position, and shape, which can, in turn, be used to calculate skyrmion–skyrmion interactions and lattice ordering. We apply this approach to segmenting images of Néel skyrmion lattices so that we can accurately identify skyrmion size and deformation in both dense and sparse lattices. The model is trained using a large set of micromagnetic simulations as well as simulated LTEM images. This entirely open-source training pipeline can be applied to a wide variety of magnetic features and materials, enabling large-scale statistical studies of spin textures using LTEM.

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Mechanism exploration of Cu-SnS 2-sv @GO during the process of converting cellulose hydrolysate to lactic acid under mild reaction conditions

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Applied Catalysis A: General 2025年 703卷

作者： Pingli Sun Xinrui Wang Shaocong Yang Fanyao Meng Yue Zhao Xiaomeng Zhou Jianing Wang Xinjian Zhang Zhen Wang State Key Laboratory of Biobased Material and Green Papermaking School of Environmental Science and Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan Shandong 250353 PR China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200438 PR China Civil Aviation University of China Tianjin 300300 PR China

Valorization of cellulose-based materials requires overcoming the energy barrier of glucose isomerization to fructose. However, the process is often reliant on high temperatures and harsh thermal-catalytic conditions. In this study, 6 %Cu-SnS 2-sv @GO aerogels were developed as catalysts to produce lactic acid (LA) from enzyme-pretreated microcrystalline cellulose. These aerogels demonstrated remarkable thermo-catalytic and photocatalytic performances. The participation of Cu significantly enhanced the Lewis acidity and the total acidity of the catalyst, thereby boosting thermo-catalytic efficiency. Notably, the catalyst facilitated glucose isomerization to fructose at relatively low temperatures, with the reaction launching around 40 °C. Furthermore, Cu doping modulates the band structure of the catalyst, enhancing its light absorbability and improving the separation efficiency of photoinduced electron-hole pairs. Fructose produced during the single thermo-catalysis process accumulates due to its slow conversion rate. In contrast, the accumulated fructose is effectively depleted during thermo-photocatalysis, significantly enhancing both the selectivity and yield of levulinic acid (LA). Among the synthesized catalysts, 6 %Cu-SnS 2-sv @GO demonstrated the highest performance, achieving an optimal LA yield of 83.6 % (based on the enzymatic hydrolysate) at 80 °C under 2 hours of visible-light irradiation. These findings present a novel and efficient strategy for the high-value utilization of cellulose-based materials.

关键词： Cellulose conversion Isomerization Lactic acid Synergistic effect

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Plasmonic metasurfaces: Light-matter interactions, fabrication, applications and future outlooks

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Progress in materials science 2025年 154卷

作者： Fan Yang Wei Cao Guangchao Zheng Li Qiu Zhihong Nie Yue Li School of Physical Science and Technology Tiangong University 300387 Tianjin China School of Physics and Microelectronics Key Laboratory of Material Physics Ministry of Education Zhengzhou University 450001 Zhengzhou China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University 200433 Shanghai China

Plasmonic metasurfaces (PMs) consist of thin, sub-wavelength layers formed by meta -atoms derived from metallic nanostructures, designed to manipulate the interaction between electromagnetic fields and matter. The collective features of PMs are determined by both the properties of the nanoparticles (NPs) and the symmetry, dimensions, order, and orientation of the underlying superstructure. These combined characteristics enable PMs to play a crucial role in applications such as sensing, energy harvesting, nanolasing, nonlinear optics and surface-enhanced spectroscopy. This review focuses on three main aspects of PMs: light-matter interactions, fabrication methods, and applications. The near-field and far-field optical properties of various plasmonic superstructures, from the simplest individual nanostructures to more complex one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) PM superstructures, are systematically analyzed. Following this, a summary of the techniques employed for the fabrication of these PMs is provided, covering top-down, bottom-up, and hybrid strategies. The diverse applications of PMs, including their weak and strong coupling with 2D materials, luminescent molecules, chiral molecules, quantum dots (QDs), upconversion materials, and more, are also discussed. The review concludes by highlighting the current challenges and future perspectives in PMs, along with insights into their potential advancements towards the next generation of nanophotonic platforms.

关键词： Metasurface Plasmonics Superstructures Optical Properties Nanophotonics PMs Plasmonic metasurfaces NPs nanoparticles 1D one-dimensional 2D two-dimensional 3D three-dimensional QDs quantum dots SRR split-ring resonator Au gold SiO 2 silicon dioxide GaP gallium phosphide SiN silicon nitride TiO 2 titanium dioxide FDTD finite difference time domain PB Pancharatnam-Berry EBL electron beam lithography ALD atomic layer deposition N.A numerical aperture GaN gallium nitride RI refractive index Ag silver LSPR localized surface plasmon resonance MIM metal–insulator-metal PDMS polydimethylsiloxane SERS surface-enhanced Raman spectroscopy DNA deoxyribonucleic acid Na sodium Ga gallium SEM scanning electron microscope Cu copper Al aluminum Pt platinum Pd palladium FEMs finite element methods NCP non-closed packed DDA discrete dipole approximation CDA coupled dipole approximation LSA lattice sum approach QCA quasicrystalline approximation SLR surface lattice resonance AI artificial intelligence DUV deep-ultraviolet NIL nanoimprint lithography BCP block copolymer DPN dip pen nanolithography SHG second harmonic generation UV ultraviolet Q-factor quality factor e-e electron–electron NIR near-infrared MIR mid-infrared LSPs localized surface plasmons FWHM full width at half maximum SPP surface plasmon polariton TEM transmission electron microscopy QCM quantum correction model SPR surface plasmon resonance TMSW theory of multiple scattering of waves 0th-order zero-order GANs generative adversarial networks INN inheritance neural network ASNN assembly neural network PR photoresist CCL capillary-force-induced collapse lithography CDL cascade domino lithography PMMA poly(methyl methacrylate) MMA methyl methacrylate ROC radius of curvature SAM spin angular momentum FESEM field emission scanning electron microscope EIT electromagnetically induced transparency EUV extreme ultraviolet R2R roll-to-roll PET polyethylene terephthalate Cr chromium SANE solvent-assisted nanoscale embossing inSANE inverse SANE PS polystyrene CTAB cetyltrimethyla

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MOF-derived spinel NiMn2O4/CoMn2O4 heterojunction and its application in a high-performance photocatalyst and supercapacitor

引用

Journal of Environmental Chemical engineering 2023年第5期11卷

作者： Lee, Kuen-Chan Hsiao, Yu-Sheng Sung, Ming-Yen Chen, Yi-Lun Wu, Nian-Jheng Huang, Jen-Hsien Cho, Er-Chieh Weng, Huei Chu Hsu, Shih-Chieh Department of Science Education National Taipei University of Education No. 134 Section 2 Heping E. Road Da-an District Taipei City106 Taiwan Ph.D. Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Road Da-an District Taipei10607 Taiwan Department of Clinical Pharmacy School of Pharmacy College of Pharmacy Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Université Paris-Saclay CNRS Institut des Sciences Moléculaires d′Orsay Orsay91405 France Department of Green Material Technology Green Technology Research Institute CPC Corporation No. 2 Zuonan Rd. Nanzi District Kaohsiung City81126 Taiwan Department of Mechanical Engineering Chung Yuan Christian University No. 200 Chungpei Rd Chungli District Taoyuan City32023 Taiwan Department of Chemical and Materials Engineering Tamkang University No. 151 Yingzhuan Road Tamsui District New Taipei City25137 Taiwan

Metal oxide heterojunctions have attracted considerable attention in photocatalyst and supercapacitor applications. In this study, NiMn2O4/CoMn2O4 (NMO/CMO) heterojunctions were synthesized using ternary metal-organic frameworks (MOFs) as precursors. After calcination at 500 °C, the as-prepared NMO/CMO composite maintains the porous sheet-like morphology of the ternary MOF, exhibiting a highly porous structure. The heterostructured NMO/CMO composite demonstrates enhanced photocatalytic performance compared with pure NMO and CMO. This enhancement may be attributed to the well-aligned energy levels at the NMO/CMO interface, which effectively reduces charge recombination and facilitates the efficient transport of photogenerated carriers. In addition, the NMO/CMO heterojunction exhibits enhanced supercapacitor performance owing to the increased number of active redox sites and reduced charge transfer resistance. When tested at 3 A/g, the NMO/CMO composite displays a higher capacitance (756.4 F/g) than pure NMO (579.6 F/g) and CMO (519.6 F/g) and remarkable rate capability, maintaining a capacitance of 639 F/g even at 10 A/g. Notably, asymmetric supercapacitors fabricated using NMO/CMO and activated carbon can achieve an energy density of 32.18 W h/kg at 750 W/kg and superior cycling life, retaining 92.1% of its initial capacitance after 3000 cycles. © 2023 Elsevier Ltd

关键词： Heterojunctions

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Effects of wet pressing temperature, filler addition, and pae-based strength agents on initial wet-web strength of HwBKP-SwBKP sheet

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2020年第1期52卷 66-76页

作者： Kim, Jin-Soo Cho, Byoung-Uk Department of Paper Science and Engineering College of Forest and Environmental Sciences Kangwon National University Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Korea Republic of

Effects of wet pressing temperature, fillers addition, and the type and the dosage of strength agents on initial wet-web strength were investigated. Two types of strength agents consisting of PAE (polyamideamine-epichlorohydrin)-PVA (polyvinyl alcohol), and PAE-MP (micropolymer) were applied. It was found that the addition of the PAE-PVA strength agent can improve the initial wet-web strength of the HwBKP-SwBKP sheets in any conditions while the PAE-MP strength agent may not be proper for the papermaking stock with filler. When the PAE-MP strength agent was added to the stock with filler, initial wet-web strength was deteriorated possibly due to the heavy flocculation of fillers and poor paper formation. Increasing wet pressing temperature enhanced dewatering and increased the solid content of wet-web, resulting in the improved initial wet-web strength. The efficiency of the strength agents was improved with increasing wet pressing temperature (i.e. at a high solids content of web) possibly due to the closer distance between fibers. In addition, increasing the added amount of filler increased the solids content of wet-web after pressing. However, the addition of filler deteriorated the initial wet-web strength and reduced the efficiency of the strength agents. © 2020 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Fillers

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