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SSRN 2024年

作者： Wang, Kai Bai, Xuan Chen, Chong Yang Yan, Jun Department of Physics Anhui Key Laboratory of Optoelectric Materials Science and Technology Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University Wuhu241000 China Shanghai EBIT Lab Key Laboratory of Nuclear Physics and Ion-Beam Application Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai200433 China Institute of Applied Physics and Computational Mathematics Beijing100088 China

Highly accurate calculations are performed for the lowest 151 fine-structure levels arising from the $3s^{2}3p^{3}$, $3s3p^{4}$, $3s^{2}3p^{2}3d$, $3s3p^{3}3d$, $3p^{5}$ and $3s^{2}3p3d^{2}$ configurations in P-like \mbox{Se XX} using the multiconfiguration Dirac-Hartree-Fock and the relativistic configuration interaction *** and consistent atomic data, including excitation energies, wavelengths, E1, E2, M1, M2 line strengths, oscillator strengths, transition rates, and lifetimes for these 151 levels, are provided. Our data set is compared with the NIST compiled values and other available *** present data are accurate enough for identification and deblending of emission lines involving the $n=3$ levels and are also useful for modeling and diagnosing fusion plasmas. These data can be considered as a benchmark for other calculations. © 2024, The Authors. All rights reserved.

关键词： Phosphorus

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Wafer-scale patterned growth of type-II Dirac semimetal platinum ditelluride for sensitive room-temperature terahertz photodetection

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InfoMat 2023年第5期5卷 17-27页

作者： Zhuo Dong Wenzhi Yu Libo Zhang Liu Yang Luyi Huang Yan Zhang Zeqian Ren Haoran Mu Cheng Chen Junrong Zhang Jie Li Lin Wang Kai Zhang CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhouJiangsuthe People's Republic of China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefeiAnhuithe People's Republic of China Songshan Lake Materials Laboratory DongguanGuangdongthe People's Republic of China State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaithe People's Republic of China

As the lastly unexplored electromagnetic wave,terahertz(THz)radiation has been exploited in a plenty of contexts such as fundamental research,military and civil *** recently,representative two-dimensional(2D)topological semimetal,platinum ditelluride(PtTe_(2))has attracted considerable research interest in THz detection due to its unique physical ***,to achieve practical applications,the low-cost,large-scale,controllable synthesis and efficient patterning of 2D materials are key requirements,which remain a challenge for PtTe_(2)and its photodetectors(PDs).Herein,a facile approach is developed to obtain waferscale(2-inches)patterned PtTe_(2)arrays using one-step tellurium-vapor transformation method and micro-Nano ***_(2)PD arrays are fabricated with the as-grown PtTe_(2)arrays evenly distributed on a 2-inch wafer,exhibiting high conductivity(~2.7×105 S m^(-1))and good electrical *** by the Dirac fermions,PtTe_(2)PDs achieve a broadband(0.02-0.3 THz)response with a fast response speed(~4.7μs),a high sensitivity(~47 pW Hz^(-1/2))and high-resolution transmission THz-imaging capability,which displays the potential of large-area THz array *** results are one step towards the practical applications of integrated PD arrays based on 2D materials.

关键词： patterned growth photodetection platinum ditelluride terahertz wafer-scale

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Soliton optical frequency comb generation from polygon modes in weakly perturbed lithium niobate microdisks 18

Soliton optical frequency comb generation from polygon modes...

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Laser-based Micro- and Nanoprocessing XVIII 2024

作者： Fu, Botao Lin, Jintian Gao, Renhong Yao, Ni Guan, Jianglin Li, Chuntao Zhao, Guanghui Li, Minghui Cheng, Ya Shanghai201800 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China School of Physics and Electronic Science East China Normal University Shanghai200241 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China School of Physical Science and Technology Shanghai Tech University Shanghai200031 China Research Center for Humanoid Sensing Zhejiang Lab Hangzhou311100 China

ISBN: (纸本)9781510670068

Microresonator-based Kerr soliton microcombs are coherent light sources consisting of equally spaced and phase locked discrete optical frequency components, which are essential tools for practical applications in precision spectroscopy and data processing. While anomalous microresonator dispersion is mandatory for Kerr soliton microcomb formation, so far almost all dispersions are susceptible to manufacturing error and cannot be tuned once the microstructure is made. Moreover, microcomb formation in strongly Raman-active mediums like lithium niobate (LN) is challenging in the suppression of stimulated Raman scattering and mode crossing due to the existence of densely distributed multiple whispering galley mode (WGM) families. Here, Kerr soliton microcombs were formed in a normal dispersion LN microdisk resonator by mode trimming. Despite that the fundamental WGM family is of normal dispersion and there are densely distributed high-order WGM families within the LN microdisk, high-Q square modes of anomalous dispersion and small mode volume are coherently formed by introducing weak perturbation for mode trimming. Under the optical pump of the square mode of 35-mW power, densely distributed WGM families are avoided to be excited, leading to the suppression of Raman scattering effects and mode crossing, and the formation of soliton microcomb with a spectrum spanning from 1450 nm to 1620 nm. © 2024 SPIE.

关键词： Microresonators

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Orbital Magneto-Nonlinear Anomalous Hall Effect in Kagome Magnet Fe3Sn2

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Physical Review Letters 2024年第10期132卷 106601-106601页

作者： Lujunyu Wang Jiaojiao Zhu Haiyun Chen Hui Wang Jinjin Liu Yue-Xin Huang Bingyan Jiang Jiaji Zhao Hengjie Shi Guang Tian Haoyu Wang Yugui Yao Dapeng Yu Zhiwei Wang Cong Xiao Shengyuan A. Yang Xiaosong Wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontiers Science Center for Nano-optoelectronics Peking University Beijing 100871 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore 487372 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China School of Sciences Great Bay University Dongguan 523000 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Institute of Applied Physics and Materials Engineering University of Macau Taipa Macau China Department of Physics The University of Hong Kong Hong Kong China HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010 Jiangsu China

It has been theoretically predicted that perturbation of the Berry curvature by electromagnetic fields gives rise to intrinsic nonlinear anomalous Hall effects that are independent of scattering. Two types of nonlinear anomalous Hall effects are expected. The electric nonlinear Hall effect has recently begun to receive attention, while very few studies are concerned with the magneto-nonlinear Hall effect. Here, we combine experiment and first-principles calculations to show that the kagome ferromagnet Fe3Sn2 displays such a magneto-nonlinear Hall effect. By systematic field angular and temperature-dependent transport measurements, we unambiguously identify a large anomalous Hall current that is linear in both applied in-plane electric and magnetic fields, utilizing a unique in-plane configuration. We clarify its dominant orbital origin and connect it to the magneto-nonlinear Hall effect. The effect is governed by the intrinsic quantum geometric properties of Bloch electrons. Our results demonstrate the significance of the quantum geometry of electron wave functions from the orbital degree of freedom and open up a new direction in Hall transport effects.

关键词： Anomalous Hall effect Electronic structure Topological materials Kagome lattice Soft magnets Weyl semimetal

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Ultrahigh “Relative Energy Density” and Mass Loading of Carbon Cloth Anodes for K-Ion Batteries

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CCS Chemistry 2021年第2期3卷 791-799页

作者： Junpeng Xie Jinliang Li Xiaodan Li Hang Lei Wenchen Zhuo Xibo Li Guo Hong Kwun Nam Hui Likun Pan Wenjie Mai Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632 Institute of Applied Physics and Materials Engineering(IAPME) University of Macao.Department of Physics and ChemistryFaculty of Science and TechnologyUniversity of MacaoMacao SAR 999078 Department of Chemistry Jinan UniversityGuangzhou 510632 Shanghai Key Laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062

Mass loading and potential plateau are the two most important issues of potassium(K)-ion batteries(KIBs),but they have long been ignored in previous ***,we report a simple and scalable method to fabricate acidized carbon clothes(A-CC)as high mass loading(13.1 mg cm−2)anode for KIBs,which achieved a reversible areal-specific capacity of 1.81 mAh cm−2 at 0.2 mA cm−***,we have proposed the concept of“relative energy density”to reasonably evaluate the electrochemical performance of the *** to our calculation method,the A-CC electrode exhibited an ultrahigh relative energy density of 46 Wh m−2 in the initial charge process and remained at 40 Wh m−2 after 50 ***,we performed the operando Raman spectroscopy(ORS)to investigate the K-ion storage *** believe that our work might provide a new guideline for the evaluation of anode performance,thereby,opening an avenue for the development of commercial anode.

关键词： acidized carbon clothes relative energy density high mass loading operando Raman spectra,K-ion batteries

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NiS ultrafine nanorod with translational and rotational symmetry

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National science Review 2024年第7期11卷 218-225页

作者： Jianxin Kang Qi Hu Ruixuan Zhang Ang Gao Zhongning Huang Ziming Su Ke Pei Qinghua Zhang Li-Min Liu Renchao Che Lin Gu Er-Jia Guo Lin Guo School of Chemistry Beihang University Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering&Technology Fudan University Zhejiang Laboratory Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences School of Physics Beihang University

Anisotropy is a significant and prevalent characteristic of materials, conferring orientation-dependent properties, meaning that the creation of original symmetry enables key functionality that is not found in nature. Even with the advancements in atomic machining, synthesis of separated symmetry in different directions within a single structure remains an extraordinary challenge. Here, we successfully fabricate NiS ultrafine nanorods with separated symmetry along two directions. The atomic structure of the nanorod exhibits rotational symmetry in the radial direction, while its axial direction is characterized by divergent translational symmetry, surpassing the conventional crystalline structures known to date. It does not fit the traditional description of the space group and the point group in three dimensions, so we define it as a new structure in which translational symmetry and rotational symmetry are separated. Further corroborating the atomic symmetric separation in the electronic structure, we observed the combination of stripe and vortex magnetic domains in a single nanorod with different directions, in accordance with the atomic *** manipulation of nanostructure at the atomic level introduces a novel approach to regulate new properties finely, leading to the proposal of new nanotechnology mechanisms.

关键词： separated symmetry NiS anisotropy structure atomic machining magnetic domain

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3D/4D additive-subtractive manufacturing of heterogeneous ceramics

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Journal of Materials science & technology 2024年第34期201卷 210-221页

作者： Guo Liu Xinya Lu Xiaofeng Zhang Yan Zhao Shenghui Yi Jingjun Xu Yuqi Zhan Jianan Yin Chengcheng Feng Zhifeng Zhou Peiyu Wang Zhou Chen Yunhu He Siyao Chen Pengchao Liu Jun Zuo Yu Dai Jian Wu Sida Liu Jian Lu Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China CityU-Shenzhen Futian Research Institute Shenzhen 518045China Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Faculty of Materials Science Shenzhen MSU-BIT UniversityShenzhen 518100China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Physics and Materials Nanchang UniversityNanchang 330031China

The manufacturing of heterogeneous high-temperature material components is challenging for use in practical ***-dimensional(3D)printing provides solutions to programmable constructing ceramic ***,the development of heterogeneous ceramics is limited by low flexibil-ity of heterogeneity,geometrical complexity,structural resolution,manufacturing efficiency,and mate-rial *** this study,we demonstrated flexible and rapid approaches for fabricating complicated and precise heterogeneous ceramics by shape-changing(4D)or shape-keeping(3D)additive-subtractive manufacturing(ASM)*** shape-changing strategy for heterogeneous ceramics was achieved by global ceramization of heterogeneous precursors,while the shape-keeping strategy for heterogeneous ceramics was achieved by local receramization of homogeneous *** element analysis(FEA)simulations of the influence of the thermal shrinkage dominant in the shape-changing strategy on the shape deformation of heterogeneous ceramics could be valuable predictions of the experimental *** 3D/4D ASM methods are generic for high-temperature materials and extendable to metallic and dia-mond materials.

关键词： 3D/4D printing Additive-subtractive manufacturing Heterogeneous ceramics Elastomer-derived ceramics Local receramization

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BiOBr quantum dots as low detection Ammonia sensors: Room temperature detection and adsorption mechanism analysis

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Chemical physics Letters 2025年 874-875卷

作者： Yang, Xuekun Qin, Fangrong Chen, Fang Huang, Peng Wang, Weiliang Huang, Haiming Guo, Yuxi Zhang, Shaolin School of Physics and Materials Science Guangzhou University Guangzhou510006 China Key Lab of Si-based Information Materials & Devices and Integrated Circuits Design Department of Education of Guangdong Province Guangzhou510006 China School of Physics Guangdong Province Key Laboratory of Display Material and Technology Center for Neutron Science and Technology Sun Yat-sen University Guangzhou510275 China Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China

BiOBr quantum dots (QDs) were synthesized by aqueous phase method for room temperature ammonia detection. It was found that the BiOBr QDs exhibited a 65 % response to 100 ppm NH3 with a low detection limit of 1.54 ppm. DFT calculations further demonstrated the excellent selectivity and reproducibility of the BiOBr QDs. The ultra-small size, high specific surface area, and abundant unsaturated edge sites of the BiOBr QDs facilitated the oxygen adsorption and charge transfer, enabling efficient room-temperature chemo- resistive sensing. These findings emphasize the importance of BiOBr QDs as high-performance materials for ammonia detection under ambient conditions. © 2025

关键词： Nanocrystals

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30 m 64-QAM multicarrier photonic-wireless communication link in the 300 GHz band 2

30 m 64-QAM multicarrier photonic-wireless communication lin...

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Advanced Optical Manufacturing Technologies and Applications 2022, AOMTA 2022 and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2022

作者： Zhang, Hongqi Yang, Zuomin Lyu, Zhidong Yang, Hang Zhang, Lu Pang, Xiaodan Ozolins, Oskars Yu, Xianbin College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Zhejiang Lab Hangzhou311121 China Applied Physics Department KTH Royal Institute of Technology Stockholm106 91 Sweden Networks Unit RISE Research Institutes of Sweden Kista164 40 Sweden

ISBN: (纸本)9781510661264

In recent years, terahertz communication has attracted extensive attentions due to its large bandwidth for supporting terabit-per-second capacity. Along with the rapid evolution of terahertz optoelectronic devices, remarkable achievements have been witnessed in developing photonic terahertz communication systems with large capacities. In fact, photonics-assisted terahertz communication systems have exhibited some advantages, for instance, bridging a seamless connection between the existing optical fiber network and wireless network, offering flexible carrier switching over a wide radio frequency range, as well as supporting easy implementation of high-order complex modulation formats and multicarrier multiplexing terahertz channels. However, due to high atmospheric propagation loss, limited terahertz component bandwidth and low terahertz emission power, achieving simultaneous transmission of single-lane data rates beyond 200 Gbps is still challenging based on a single pair of terahertz transceivers. In this work, by employing subcarrier (SC) multiplexing, high-order 64-ary quadrature amplitude modulation (64-QAM) format, well-defined digital signal processing (DSP) and wideband terahertz transceivers, a multicarrier terahertz photonic-wireless communication link operating in the 300 GHz band is proposed and experimentally demonstrated. At the transmitter side, a baseband pseudo-random binary sequence (PRBS-15) signal with a baud rate of 12 Gbaud is generated from an arbitrary waveform generator (AWG), and then modulated onto an optical carrier centered at 193.414 THz. The modulated optical signal is combined with three optical carriers centered at 193.7035 THz, 193.7165 THz, and 193.7295 THz, for multi-carrier THz generation at a uni-traveling carrier photodiode (UTC-PD) featuring large bandwidth (100 GHz), which consists of three SCs centered at 286.5 GHz, 299.5 GHz and 312.5 GHz, respectively. At the receiver side, we employ a Schottky diode mixer with high sensit

关键词： Transceivers

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REPRESENTATION SHATTERING IN TRANSFORMERS: A SYNTHETIC STUDY WITH KNOWLEDGE EDITING

arXiv

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arXiv 2024年

作者： Nishi, Kento Okawa, Maya Ramesh, Rahul Khona, Mikail Tanaka, Hidenori Lubana, Ekdeep Singh CBS-NTT Program in Physics of Intelligence Harvard University United States Computer and Information Science University of Pennsylvania United States Department of Physics Massachusetts Institute of Technology United States Physics and Informatics Lab NTT Research Inc United States

Knowledge Editing (KE) algorithms alter models’ weights to perform targeted updates to incorrect, outdated, or otherwise unwanted factual associations. To better identify the possibilities and limitations of these approaches, recent work has shown that applying KE can adversely affect models’ factual recall accuracy and diminish their general reasoning abilities. While these studies give broad insights into the potential harms of KE algorithms, e.g., via performance evaluations on benchmarks, we argue little is understood as to why such destructive failures occur. Is it possible KE methods distort representations of concepts beyond the targeted fact, hence hampering abilities at broad? If so, what is the extent of this distortion? Motivated by such questions, we define a novel synthetic task wherein a Transformer is trained from scratch to internalize a "structured" knowledge graph. The structure enforces relationships between entities of the graph, such that editing a factual association has "trickling effects" on other entities in the graph (e.g., altering X’s parent is Y to Z affects who X’s siblings’ parent is). Through evaluations of edited models and analysis of extracted representations, we show that KE inadvertently affects representations of entities beyond the targeted one, distorting relevant structures that allow a model to infer unseen knowledge about an entity. We call this phenomenon representation shattering and demonstrate that it results in degradation of factual recall and reasoning performance more broadly. To corroborate our findings in a more naturalistic setup, we perform preliminary experiments with pre-trained Llama and Mamba models, reproducing the representation shattering effect therein as well. Overall, our work yields a precise mechanistic hypothesis to explain why KE has adverse effects on model abilities. Copyright © 2024, The Authors. All rights reserved.

关键词： Knowledge graph

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