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Infrared Magnetopolaritons in MoTe2 Monolayers and Bilayers

Physical Review Letters 2025年第7期134卷 076902-076902页

作者： Bo Han Jamie M. Fitzgerald Lukas Lackner Roberto Rosati Martin Esmann Falk Eilenberger Takashi Taniguchi Kenji Watanabe Marcin Syperek Institut für Physik Fakultät V Carl von Ossietzky Universität Oldenburg 26129 Oldenburg Germany Department of Physics Philipps-Universität Marburg Mainzer Gasse 33 D-35032 Marburg Germany Fraunhofer-Institute for Applied Optics and Precision Engineering IOF 07745 Jena Germany Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller Universität Jena 07745 Jena Germany Max Planck School of Photonics 07745 Jena Germany International Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba 305-0044 Japan Research Center for Functional Materials National Institute for Materials Science Tsukuba 305-0044 Japan Department of Experimental Physics Faculty of Fundamental Problems of Technology Wrocław University of Science and Technology Wyb.Wyspiańskiego 27 50-370 Wrocław Poland

MoTe2 monolayers and bilayers are unique within the family of van der Waals materials since they pave the way toward atomically thin infrared light-matter quantum interfaces, potentially reaching the important telecommunication windows. Here, we report emergent exciton polaritons based on MoTe2 monolayers and bilayers in a low-temperature open microcavity in a joint experiment-theory study. Our experiments clearly evidence both the enhanced oscillator strength and enhanced luminescence of MoTe2 bilayers, signified by a 38% increase of the Rabi splitting and a strongly enhanced relaxation of polaritons to low-energy states. The latter is distinct from polaritons in MoTe2 monolayers, which feature a bottlenecklike relaxation inhibition. Both the polaritonic spin valley locking in monolayers and the spin-layer locking in bilayers are revealed via the Zeeman effect, which we map and control via the light-matter composition of our polaritonic resonances.

关键词： Phonons

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Discoloration Process of Minted Copper-Nickel Alloys in Chloride Ion-Containing Environments: Experimental and Dft Research

SSRN

引用

SSRN 2024年

作者： Xing, Chenzhi Lee, Ming-Hsien Cao, Gongwang Liu, Yuwei Guo, Quanzhong Wang, Zhenyao Wang, Chuan School of Materials Science and Engineering School of Materials Science and Engineering University of Science and Technology of China Shenyang110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station Shenyang110016 China Department of Physics Tamkang University Tamsui New Taipei25137 Taiwan

In this research, CIE Lab and UV-VIS absorption spectrum were used to establish the corrosion discoloration model of coinage Cu-Ni alloy. Combined with XPS and EIS, the corrosion stage and corrosion resistance can be evaluated by surface color. DFT results show that Ni improves the adsorption energy due to the enhancement of d-band center, and promotes the formation of NiO. In addition, Ni has higher vacancy formation energy and migration activation energy, so it can reduce the vacancy concentration and diffusion rate of cations. At the same time, Ni doping in Cu2O decreases carrier migration rates and enhancing corrosion resistance. © 2024, The Authors. All rights reserved.

关键词： Absorption spectroscopy

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Gamma Prime Formation in Nickel-Based Superalloy In738lc Manufactured by Laser Powder Bed Fusion

SSRN

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SSRN 2023年

作者： Schulz, Fiona Lindgren, Kristina Xu, Jinghao Hryha, Eduard Department of Industrial and Materials Science Chalmers University of Technology GöteborgSE-41296 Sweden Institute of Materials Science Universität der Bundeswehr München NeubibergDE-85579 Germany Department of Physics Chalmers University of Technology GöteborgSE-41296 Sweden Division of Engineering Materials

Complex components for high-temperature gas turbine applications require materials that offer a combination of excellent high-temperature strength and oxidation resistance. Nickel-based superalloys with high gamma prime (γ´) volume fractions are particularly suited for these applications, especially combined with additive manufacturing for complex geometries. Despite the complex thermal history that materials experiences during laser powder bed fusion (LPBF) processing, γ´ formation is suppressed when manufacturing IN738LC. This alloy has a medium equilibrium γ´ content of about 40-50 vol.%. This study follows γ´ formation in LPBF IN738LC during subsequent annealing treatments at temperatures ranging from 745°C to 865°C, creating an experimentally determined TTT (temperature-time-transformation) diagram. This diagram is largely based on scanning electron microscopy (SEM) imaging supported by Vickers hardness measurements and scanning transmission electron microscopy (STEM) bright field imaging. Atom probe tomography (APT) of the as-built material indicated nm-sized regions depleted in Cr and enriched in Ni, Al, and Ti, but show no characteristic superlattice patterns in TEM diffraction. APT and TEM diffraction analysis of material annealed at 850°C for 3 min confirmed the presence of the γ´phase but indicated that γ´ had formed through spinodal decomposition instead of precipitation. © 2023, The Authors. All rights reserved.

关键词： Oxidation resistance

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High-entropy compounds for water electrolysis: insights into dynamic reconstruction behavior and its impact on oxygen evolution reaction catalysis

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Journal of Energy Chemistry 2025年 108卷 307-316页

作者： Ye, Beirong Liu, Hongxian Li, Chen Zhang, Tengfei Li, Yongqi Liang, Xinqi Chen, Renhong Tang, Tao Huang, Fengyu Li, Sipu Zhang, Lingjie Noori, Abolhassan Mousavi, Mir F. Xia, Xinhui Zhang, Yongqi Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Sichuan Chengdu611731 China University of Electronic Science and Technology of China Zhejiang Huzhou313002 China School of Physics and Electronic Science Zunyi Normal University Guizhou Zunyi563006 China School of Electrical Engineering University of South China Hunan Hengyang421001 China State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Zhejiang Hangzhou310027 China Department of Chemistry Faculty of Basic Sciences Tarbiat Modares University Tehran14117-13116 Iraq College of Materials Science & Engineering Zhejiang University of Technology Zhejiang Hangzhou310014 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Hubei Wuhan430200 China

Component leaching plays a pivotal role in enhancing the activity and stability of high-entropy-based catalysts by triggering structural reconstruction during the oxygen evolution reaction (OER). In this study, we employed soluble V and Mo as sacrificial components alongside a Co stabilizer to synthesize NiFeCoVMo high-entropy catalysts, aiming to simultaneously modulate the reconstruction behavior and optimize catalytic performance. The synergistic interplay between dual-component dissolution and in situ deposition/adsorption mechanisms accelerates structural evolution, ultimately yielding MoO42−-modified NiFeCo oxyhydroxide (NiFeCoOOH-MoO42−). Mechanistic studies reveal that the NiFeCo-based system is particularly conducive to the reconstruction process, while adsorbed MoO42− function as electronic modulators that redistribute charge densities within the reconstructed layers and reduce surface energy. As a result, this reconstructed catalyst demonstrates exceptional OER activity, achieving an overpotential of 172 mV at 10 mA cm−2, along with remarkable long-term durability (up to 500 h at 50 mA cm−2). This study provides fundamental insights into the origins of the superior electrocatalytic performance of high-entropy materials, paving the way for further exploration and optimization of these advanced catalysts. © 2025

关键词： Light modulators

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Co/N-doped carbon nanotube arrays grown on 2D MOFs-derived matrix for boosting the oxygen reduction reaction in alkaline and acidic media

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Chinese Chemical Letters 2021年第2期32卷 816-821页

作者： Shuao Wan Jiadong Wu Depeng Wang Huiling Liu Zhicheng Zhang Jianmin Ma Cheng Wang Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and EngineeringTianjin Key Laboratory of Advanced Functional Porous Materials.Tianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of SciencesTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China School of Physics and Electronics Hunan UniversityChangsha 410082China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China

The development of high-performance and cost-effective electrocatalysts towards oxygen reduction reaction(ORR) is of significant importance,but still challenging for the practical applications in related energy *** process typically suffers from sluggish kinetics,the exploration of ORR electrocatalyst thus requires elaborate ***,an effective strategy is developed for growing Co/N-doped carbon nanotube arrays on 2D MOFs-derived matrix via the pyrolysis of Co/Zn metalorganic-framework(MOF) *** Co/Zn-MOF nanosheets serve as both the self-template for the 2D carbonized framework morphology and C/N source for the in-situ growth of 1D N-doped carbon *** constructed hie rarchical architecture effectively integrates the OD/1D Co nanoparticle/Ndoped carbon nanotube interface and 1D(nanotubes)/2D(nanosheets) junction into frameworks with highly exposed active surface,enhanced mass-transport kinetics and electrical *** a result,the designed composite exhibits superior ORR activity and durability in alkaline media as compared to commercial Pt/***,it shows promising ORR performance with a half-wave potential of 0.78 V versus reversible hydrogen electrode and negligible activity attenuation after 5000 potential cycles in acidic *** designed strategy can be extended to construct other MOFs-derived carbon matrixes with diverse hierarchical structures and provide an efficient avenue for searching highperformance electrocatalysts.

关键词： Carbon nanotube arrays Metal-organic-frameworks derived materials Metal/nitrogen-doped carbon electrocatalysts Oxygen reduction reaction Alkaline and acidic media

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Magnetic field control of continuous Néel vector rotation and Néel temperature in a van der Waals antiferromagnet

arXiv

引用

arXiv 2024年

作者： Ni, Zhuoliang Seifert, Urban Haglund, Amanda V. Huang, Nan Mandrus, David G. Balents, Leon Wu, Liang Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States Kavli Institute for Theoretical Physics University of California Santa Barbara Santa BarbaraCA93106 United States Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States

In a collinear antiferromagnet, spins tend to cant towards the direction of an applied magnetic field, thereby decreasing the energy of the system. The canting angle becomes negligible when the magnetic field is small so that the induced anisotropic energy is substantially lower than the exchange energy. However, this tiny anisotropy can play a significant role when the intrinsic anisotropy of the antiferromagnet is small. In our work, we conduct direct imaging of the Néel vector in a two-dimensional easy-plane antiferromagnet, MnPSe3, with negligible spin canting under an external in-plane magnetic field. The small inherent in-plane anisotropy allows for the continuous rotation of the Néel vector by ramping up the magnetic field in samples from the bulk to the monolayer. In monolayer samples, the applied magnetic field elevates the Néel temperature 10% at 5 tesla, as the combination of intrinsic and field-induced anisotropies set a critical temperature scale for fluctuations of the otherwise disordered Néel vector field. Our study illuminates the contribution of field-induced anisotropy in two dimensional magnets with in-plane anisotropy. We also demonstrate that the strain can tune the spin flop transition field strength by one order of magnitude. Copyright © 2024, The Authors. All rights reserved.

关键词： Monolayers

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Synthesis and Characterization of MXene from MAX phase

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materials Today: Proceedings 2022年 58卷 714-716页

作者： Ghosh, Arijit Pal, Himangshu Das, Tanay Chatterjee, Somenath Das, Amalendu Department of Electrical and Electronics Engineering Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India Department of Electronics and Communication Engineering Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India Centre for Materials Science and Nanotechnology Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India Department of Electronics and Communication National Institute of Technology Durgapur713209 India Department of Physics Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India

In today's technology advancement dictates towards finding a new element for wide applications, starting from medicine to energy storage as well as other optoelectronics. A group of transition metals and aluminium or silicon chemically combine with carbon or nitrogen is known as MAX phase. A technique has been described here to eliminate aluminium from the MAX phase to form exfoliated layered structured MXene, which may create a potential role in the above mentioned applications. After successful synthesis of MXene was characterized using XRD to determine the crystallinity, SEM analysis for morphological study, EDAX for elemental analysis, and UV-Vis spectroscopy for optical band gap determination. © 2022

关键词： Aluminum

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Interferometry Among Strongly Driven Quasiparticles with Distinct Dynamical and Geometrical Phases

Interferometry Among Strongly Driven Quasiparticles with Dis...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Seamus O'Hara Joe Costello Qi Tian Qile Wu Ken West Loren Pfeiffer Mark Sherwin Liang Wu Department of Physics and Institute of Terahertz Science and Technology University of California Santa Barbara Santa Barbara CA Intelligence Community Post-Doctoral Research Fellowship Program Philadelphia PA Department of Physics University of Pennsylvania Philadelphia PA Department of Electrical and Computer Engineering Princeton University Princeton NJ

ISBN: (纸本)9798350369311

In this proceeding, we present polarization data of sidebands emitted from strongly driven quasiparticles, demonstrate the dependence of these data on various parameters of the external driving field, and describe the data using an analytical expression, dependent on driving field parameters and the effective Hamiltonian of the system. We propose using this method on spin-momentum locked systems, such as altermagnets, to observe and reconstruct sidebands which are influenced by the topology of individual bands.

关键词： Electro-optic effects Amplitude modulation Topology Interferometry

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High-performance terahertz polarization filter based on the anti-resonant fiber

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Optik 2023年第1期288卷

作者： Liu, Qiang Sun, Guangrong Sun, Yudan Meng, Tongyu Mu, Haiwei Liu, Wei Ma, Chao Li, Wenjing Wang, Kaiyu Lv, Jingwei Chu, Paul K. Liu, Chao School of Physics and Electronic Engineering Northeast Petroleum University Daqing163318 China College of Mechanical and Electrical Engineering Daqing Normal University Daqing163712 China Leicester International Institute Dalian University of Technology Dalian124221 China Department of Physics Department of Materials Science and Engineering and Department of Biomedical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong

A novel terahertz polarization filter based on the anti-resonant fiber is designed and analyzed. The polarization extinction ratio (PER) is improved by using high-resistivity silicon (HRS) as the bulk material in conjunction with a double conjoined tube cladding structure. The effects of the structure and material of the anti-resonant fiber on the polarization filtering characteristics are analyzed by the finite element method. The PER of the anti-resonant fiber reaches 100 dB and the insertion loss of y-polarization fundamental mode (YPFM) is less than 0.66 dB at 1 THz when the anti-resonant fiber length is 5.58 cm. The bandwidth can be expanded by changing the fiber length and for a fiber length of 8 cm, the frequency bandwidth is 0.92–1.14 THz and the insertion loss is less than 3 dB. The polarization filter is demonstrated to deliver excellent performance in the terahertz frequency range and has large commercial potential in terahertz communication and biomedical spectroscopy. © 2023

关键词： Fibers

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Probing the Optical Dynamics of Quantum Emitters in Hexagonal Boron Nitride

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PRX Quantum 2022年第3期3卷 030331-030331页

作者： Raj N. Patel David A. Hopper Jordan A. Gusdorff Mark E. Turiansky Tzu-Yung Huang Rebecca E. K. Fishman Benjamin Porat Chris G. Van de Walle Lee C. Bassett Quantum Engineering Laboratory Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Physics University of California Santa Barbara California 93106 USA Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104 USA Materials Department University of California Santa Barbara California 93106 USA

Hexagonal boron nitride is a van der Waals material that hosts visible-wavelength quantum emitters at room temperature. However, experimental identification of the quantum emitters’ electronic structure is lacking, and key details of their charge and spin properties remain unknown. Here, we probe the optical dynamics of quantum emitters in hexagonal boron nitride using photon emission correlation spectroscopy. Several quantum emitters exhibit ideal single-photon emission with noise-limited photon antibunching, g(2)(0)=0. The photoluminescence emission lineshapes are consistent with individual vibronic transitions. However, polarization-resolved excitation and emission suggests the role of multiple optical transitions, and photon emission correlation spectroscopy reveals complicated optical dynamics associated with excitation and relaxation through multiple electronic excited states. We compare the experimental results to quantitative optical dynamics simulations, develop electronic structure models that are consistent with the observations, and discuss the results in the context of ab initio theoretical calculations.

关键词： Color centers Photon statistics Quantum information architectures & platforms Quantum optics Single photon sources Fluorescence spectroscopy Time-resolved photoluminescence

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