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science Bulletin 2024年第13期 2050-2058页

作者：朱震霄杨林运吴吉恩孟岩郗翔颜贝陈景明陆久阳黄学勤邓伟胤尚策沈平杨怡豪陈红胜向柯鑫刘癸庚刘正猷高振 State Key Laboratory of Optical Fiber and Cable Manufacture Technology Department of Electronic and Electrical Engineering Southern University of Science and Technology School of Physics and Optoelectronics South China University of Technology Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan University King Abdullah University of Science and Technology (KAUST) Physical Science and Engineering Division (PSE) Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation CenterCollege of Information Science and Electronic Engineering ZJU-UIUC Institute Zhejiang University Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Institute for Advanced Studies Wuhan University

The Bloch band theory and Brillouin zone（BZ） that characterize wave-like behaviors in periodic mediums are two cornerstones of contemporary physics, ranging from condensed matter to topological *** theoretical breakthrough revealed that, under the projective symmetry algebra enforced by artificial gauge fields, the usual two-dimensional（2D） BZ（orientable Brillouin two-torus） can be fundamentally modified to a non-orientable Brillouin Klein bottle with radically distinct manifold ***, the physical consequence of artificial gauge fields on the more general three-dimensional（3D） BZ（orientable Brillouin three-torus） was so far missing. Here, we theoretically discovered and experimentally observed that the fundamental domain and topology of the usual 3D BZ can be reduced to a non-orientable Brillouin Klein space or an orientable Brillouin half-turn space in a 3D acoustic crystal with artificial gauge fields. We experimentally identify peculiar 3D momentum-space non-symmorphic screw rotation and glide reflection symmetries in the measured band structures. Moreover, we experimentally demonstrate a novel stacked weak Klein bottle insulator featuring a nonzero Z2topological invariant and self-collimated topological surface states at two opposite surfaces related by a nonlocal twist, radically distinct from all previous 3D topological insulators. Our discovery not only fundamentally modifies the fundamental domain and topology of 3D BZ, but also opens the door towards a wealth of previously overlooked momentum-space multidimensional manifold topologies and novel gaugesymmetry-enriched topological physics and robust acoustic wave manipulations beyond the existing paradigms.

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Synthesis of α,ω-End Functionalized Polydienes: Allylic-Bearing Heteroleptic Aluminums for Selective Alkylation and Transalkylation in Coordinative Chain Transfer Polymerization

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Angewandte Chemie 2023年第5期136卷

作者： Dr. Pibo Liu Xiao Yang Dr. He Li Dr. Songbo Zhang Prof. Yanming Hu Prof. Guangyuan Zhou Prof. Nikos Hadjichristidis Division of Energy Materials Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China Physical Sciences and Engineering Division KAUST Catalysis Center Chemistry Program Polymer Synthesis Laboratory King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Kingdom of Saudi Arabia

There are still challenges in the preparation of difunctional stereoregular polydienes, especially for the construction of initiating chain-end functionalization. Coordinative chain transfer polymerization (CCTP) provides a way to achieve the goal but usually requires sophisticated functionalized catalysts as well as expensive chain transfer agents (CTAs). In this work, heteroleptic aluminum with oligo(dienyl) substituents (oligo-Al agents) were readily prepared by living anionic polymerization (LAP) technique. The oligo-Al agents used in Nd-mediated CCTPs of dienes exhibit highly selective alkylation and transalkylation features. Kinetics and transfer efficiency studies using 1 H NMR, 13 C NMR, 1 H- 13 C HSQC, and Dosy NMR analyses revealed that the resulting polydienes possess substituents at the initiating chain-end that have transferred from the oligo-Al agents. The functionalization efficiency of the initiating chain-end is up to 99 %, and the molar mass regulation efficiency of heteroleptic aluminum is higher than that of the traditional CTA Al i Bu 2 H (0.608 vs. 0.410). Based on the experimental results and density functional theory (DFT) calculations, we propose a mechanism in which allylic-Al acts as an efficient alkylating moiety in catalyst preformation and also as an effective transfer agent in polymerization. Taking advantage of these features, di-functionalized polyisoprene, polybutadiene, and poly(isoprene-co-butadiene) can be facilely synthesized.

关键词： Aluminum Chain Transfer Polymerization End-Functionalization Neodymium Polydiene

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Spinful topological phases in acoustic crystals with projective PT symmetry

arXiv

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arXiv 2022年

作者： Meng, Yan Lin, Shuxin Shi, Bin-Jie Wei, Bin Yang, Linyun Yan, Bei Zhu, Zhenxiao Xi, Xiang Wang, Yin Ge, Yong Yuan, Shou-Qi Chen, Jingming Liu, Guigeng Sun, Hongxiang Chen, Hongsheng Yang, Yihao Gao, Zhen Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Research Center of Fluid Machinery Engineering and Technology Faculty of Science Jiangsu University Zhenjiang212013 China SKLSM Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing100190 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering ZJU-UIUC Institute Zhejiang University Hangzhou310027 China

For the classification of topological phases of matter, an important consideration is whether a system is spinless or spinful, as these two classes have distinct symmetry algebra that gives rise to fundamentally different topological phases. However, only recently has it been realized theoretically that in the presence of gauge symmetry, the algebraic structure of symmetries can be projectively represented, which possibly enables the switch between spinless and spinful topological phases. Here, we report the first experimental demonstration of this idea by realizing spinful topological phases in "spinless" acoustic crystals with projective space-time inversion symmetry. In particular, we realize a DIII-class one-dimensional topologically gapped phase characterized by a 2 winding number, which features Kramers degenerate bands and Kramers pair of topological boundary modes. Our work thus overcomes a fundamental constraint on topological phases by spin classes. Copyright © 2022, The Authors. All rights reserved.

关键词： Algebra

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Wide-angle giant photonic spin Hall effect

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physical Review B 2022年第7期106卷 075409-075409页

作者： Zhihao Chen Yu Chen Yaodong Wu Xinxing Zhou Handong Sun Tony Low Hongsheng Chen Xiao Lin Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and Applications School of Physics and Electronics Hunan Normal University Changsha 410081 China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies (CDPT) School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China International Joint Innovation Center ZJU-UIUC Institute The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China

The photonic spin Hall effect is a manifestation of the spin-orbit interaction of light and can be measured by a transverse shift δ of photons with opposite spins. The precise measurement of transverse shifts can enable many spin-related applications, such as precise metrology and optical sensing. However, this transverse shift is generally small (i.e., δ/λ<10−1, where λ is the wavelength), which impedes its precise measurement. To date, proposals to generate a giant spin Hall effect (namely, with δ/λ>102) have severe limitations, particularly its occurrence only over a narrow angular cone (with a width of Δθ<1∘). Here we propose a universal scheme to realize the wide-angle giant photonic spin Hall effect with Δθ>70∘ by exploiting the interface between free space and uniaxial epsilon-near-zero media. The underlying mechanism is ascribed to the almost-perfect polarization splitting between s and p polarized waves at the designed interface. Remarkably, this almost-perfect polarization splitting does not resort to the interference effect and is insensitive to the incident angle, which then gives rise to the wide-angle giant photonic spin Hall effect.

关键词： Light-matter interaction Photonics Spin Hall effect Spin-orbit coupling

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Perovskite-transition metal dichalcogenides heterostructures: recent advances and future perspectives

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Opto-Electronic science 2022年第8期1卷 1-40页

作者： Ahmed Elbanna Ksenia Chaykun Yulia Lekina Yuanda Liu Benny Febriansyah Shuzhou Li Jisheng Pan Ze Xiang Shen Jinghua Teng Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WaySingapore 138634Singapore Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University50 Nanyang AvenueSingapore 637371Singapore Interdisciplinary Graduate Program Energy Research Institute@NTUNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore The Photonics Institute and Center for Disruptive Photonic Technologies Nanyang Technological University50 Nanyang AvenueSingapore 639798 Singapore School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Berkeley Educational Alliance for Research in Singapore(BEARS) Ltd.1 CREATE WaySingapore 138602Singapore.

Transition metal dichalcogenides(TMDs)and perovskites are among the most attractive and widely investigated semiconductors in the recent *** are promising materials for various applications,such as photodetection,solar energy harvesting,light emission,and many *** these materials to form heterostructures can enrich the already fascinating properties and bring up new phenomena and *** in this field is growing rapidly in both fundamental studies and device ***,we review the recent findings in the perovskite-TMD heterostructures and give our perspectives on the future development of this promising *** fundamental properties of the perovskites,TMDs,and their heterostructures are discussed first,followed by a summary of the synthesis methods of the perovskites and TMDs and the approaches to obtain high-quality *** attention is paid to the TMD-perovskite heterostructures that have been applied in solar cells and photodetectors with notable performance *** through our analysis,we propose an outline on further fundamental studies and the promising applications of perovskite-TMD heterostructures.

关键词： transition metal dichalcogenides perovskites heterostructures photodetectors solar cells 2D materials

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Identification of the intrinsic, topological, and extrinsic anomalous Hall effects in noncollinear antiferromagnets

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Newton 2025年第3期1卷

作者： Shijie Xu Yuhao Jiang Bingqian Dai Yinchang Ma Chen Liu Xixiang Zhang Kang L. Wang Albert Fert Weisheng Zhao National Key Laboratory of Spintronics Hangzhou International Innovation Institute Beihang University 311115 Hangzhou China Departments of Electrical and Computer Engineering Physics and Astronomy and Material Science and Engineering University of California Los Angeles Los Angeles CA 90095 USA MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing 100191 China Hefei Innovation Research Institute Beihang University Hefei 230013 China Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Shanghai Key Laboratory of Special Artificial Microstructure Pohl Institute of Solid State Physics and School of Physics Science and Engineering Tongji University Shanghai 200092 China Laboratoire Albert Fert CNRS Thales Université Paris-Saclay Palaiseau 91767 France

The emergence of the anomalous Hall effect (AHE) in noncollinear antiferromagnets (AFMs) challenges the conventional notion that this phenomenon is exclusive to ferromagnets and primarily driven by spin-orbit coupling. However, the mechanisms contributing to this effect in such materials are often entangled, making distinctions difficult. Here, we discovered a giant AHE in a noncollinear AFM Mn 3 Pd film and investigated its origin with experimental and theoretical methods to address this complexity. Our findings reveal that the anomalous Hall resistance adheres to a new linear scaling law that facilitates the clear identification of the intrinsic Berry curvature, the scalar spin-chirality-induced topological AHE, and the extrinsic side-jump scattering AHE. Furthermore, we demonstrate that this scaling law is universally applicable to various noncollinear AFMs and altermagnets. This work enhances our understanding of the complex origins of the AHE in AFMs and paves the way for advancements in AFM spintronics.

关键词： anomalous Hall effect antiferromagnets noncollinear AFM time-reversal symmetry breaking spintronic devices

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Theoretical prediction of electronic, transport, optical, and thermoelectric properties of Janus monolayers In2XO (X=S,Se,Te)

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physical Review B 2021年第8期103卷 085422-085422页

作者： Tuan V. Vu Chuong V. Nguyen Huynh V. Phuc A. A. Lavrentyev O. Y. Khyzhun Nguyen V. Hieu M. M. Obeid D. P. Rai Hien D. Tong Nguyen N. Hieu Division of Computational Physics Institute for Computational Science Ton Duc Thang University Ho Chi Minh City 700000 Vietnam Faculty of Electrical & Electronics Engineering Ton Duc Thang University Ho Chi Minh City 700000 Vietnam Department of Materials Science and Engineering Le Quy Don Technical University Hanoi 100000 Vietnam Division of Theoretical Physics Dong Thap University Cao Lanh 870000 Vietnam Department of Electrical Engineering and Electronics Don State Technical University 1 Gagarin Square 344010 Rostov-on-Don Russian Federation Frantsevych Institute for Problems of Materials Science National Academy of Sciences of Ukraine 3 Krzhyzhanivsky Street 03142 Kyiv Ukraine Department of Physics The University of Danang—University of Science and Education Da Nang 550000 Vietnam Department of Non-metallic Materials College of Materials Engineering University of Babylon Hilla 51001 Iraq Physical Sciences Research Center Department of Physics Pachhunga University College Aizawl 796001 India Faculty of Engineering Vietnamese-German University Binh Duong 590000 Vietnam Institute of Research and Development Duy Tan University Da Nang 550000 Vietnam Faculty of Natural Sciences Duy Tan University Da Nang 550000 Vietnam

The breaking of the vertical symmetry in Janus monochalcogenides gave rise to many properties that were not present in the original monochalcogenide monolayers. However, recent papers have often focused only on Janus monochalcogenides containing S, Se, and Te elements despite that O is also one of the group VI chalcogen elements. In this paper, we systematically investigate the electronic, transport, optical, and thermoelectric properties of Janus monolayers In2XO (X=S,Se,Te) using first-principles calculations. Based on phonon spectrum analysis and ab initio molecular dynamics simulations at room temperature, In2XO monolayers were reported to be stable. Our calculations reveal that, while In2SO is an indirect semiconductor, In2SeO exhibits a direct semiconducting characteristic, and biaxial strain can lead to the semiconductor-metal phase transition in In2SeO. Monolayer In2TeO is metal at equilibrium, and its metallic characteristics are prevented under biaxial strains. Calculations for transport properties show that the carrier mobilities of In2SO and In2SeO monolayers are highly anisotropic, and electron mobility of In2SO exceeds 3×103cm2/Vs. In this paper, the optical and thermoelectric properties of In2SO and In2SeO monolayers are also investigated and discussed in detail. Finally, the electronic properties of all four possible stacking configurations of the Janus bilayers are briefly calculated. Our findings not only contribute to a more general view of the physical properties of the Janus group III monochalcogenides but also recommend them as potential nanomaterials for applications in optoelectronic and thermal devices.

关键词： Electronic structure First-principles calculations Structural properties Thermoelectric effects

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TextAI 3.0 (Multimodal): multimodal sentiment analysis using attention-enabled ensemble-based deep learning in hyperbolic space

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International Journal of Information Technology (Singapore) 2025年 1-16页

作者： Singh, Jaskaran Sanga, Prabhav Khanna, Narendra N. Laird, John R. Singh, Inder M. Kalra, Mannudeep K. Mantella, Laura E. Johri, Amer M. Faa, Gavino Tiwari, Ekta Singh, Rajesh Abbas, Mohamed Saba, Luca Suri, Jasjit S. Stroke Monitoring and Diagnostic Division AtheroPoint™ Roseville 95661 CA United States Bharati Vidyapeeth’s College of Engineering New Delhi India Department of Cardiology Indraprastha APOLLO Hospitals New Delhi 110001 India Department of Neurology and Stroke Program University of Maryland School of Medicine Baltimore United States Department of Radiology Harvard Medical School Boston 02115 MA United States Department of Biomedical and Molecular Sciences Queen’s University Kingston ON Canada Division of Cardiology Department of Medicine Queen’s University Kingston ON Canada Department of Pathology University of Cagliari Cagliari Italy Department of Computer Science Visvesvaraya National Institute of Technology (VNIT) Nagpur 440010 India Department of Research and Innovation Uttaranchal Institute of Technology Uttaranchal University Dehradun 248007 India Central Labs King Khalid University P.O. Box 960 AlQura’a Abha Saudi Arabia Electrical Engineering Department College of Engineering King Khalid University Abha 61421 Saudi Arabia Department of Neurology University of Cagliari Cagliari Italy Department of ECE Idaho State University Pocatello 83209 ID United States Department of CE Graphic Era Deemed to Be University Dehradun 248002 India University Center for Research and Development Chandigarh University Mohali India Symbiosis Institute of Technology Symbiosis International (Deemed University) Nagpur Campus Pune India Department of Innovation Global Biomedical Technologies Inc. Roseville 95661 CA United States

The rising prevalence of depression presents a significant global health challenge, underscoring the need for effective early detection through sentiment analysis. Traditional multimodal sentiment analysis methods, which rely on Euclidean space for data representation, often fail to capture the complex hierarchical relationships and non-linear structures inherent in multimodal data. To address this limitation, we propose a novel multimodal architecture that operates in hyperbolic space and incorporates attention-based ensemble learning to enhance feature representation and model performance. We developed and evaluated ten AI models—five utilizing Euclidean space and five leveraging hyperbolic space—on the Spoken Language Understanding Evaluation (SLUE) benchmark dataset. The models were assessed using cross-validation techniques to ensure robustness, and statistical analyses were conducted to validate the findings. Our results indicate that hyperbolic-based multimodal models achieve a 2.32% improvement in accuracy compared to their Euclidean counterparts, while the integration of self-attention mechanisms further contributes an average accuracy gain of 0.96%. Additionally, we observed a 3.76% decline in performance when reducing the training-to-test data ratio from 90:10 to 50:50, highlighting the importance of data distribution in model training. These findings confirm that attention-enhanced multimodal models in hyperbolic space offer superior representations for sentiment analysis. © Bharati Vidyapeeth's Institute of Computer Applications and Management 2025.

关键词： Attention-enabled Deep learning Euclidean space Hyperbolic space Multimodal Sentiment analysis

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Spinful Topological Phases in Acoustic Crystals with Projective PT Symmetry

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physical Review Letters 2023年第2期130卷 026101-026101页

作者： Yan Meng Shuxin Lin Bin-jie Shi Bin Wei Linyun Yang Bei Yan Zhenxiao Zhu Xiang Xi Yin Wang Yong Ge Shou-qi Yuan Jingming Chen Gui-Geng Liu Hong-xiang Sun Hongsheng Chen Yihao Yang Zhen Gao Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China Research Center of Fluid Machinery Engineering and Technology School of Physics and Electronics Engineering Jiangsu University Zhenjiang 212013 China SKLSM Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China

For the classification of topological phases of matter, an important consideration is whether a system is spinless or spinful, as these two classes have distinct symmetry algebra that gives rise to fundamentally different topological phases. However, only recently has it been realized theoretically that in the presence of gauge symmetry, the algebraic structure of symmetries can be projectively represented, which possibly enables the switch between spinless and spinful topological phases. Here, we report the experimental demonstration of this idea by realizing spinful topological phases in “spinless” acoustic crystals with projective space-time inversion symmetry. In particular, we realize a one-dimensional topologically gapped phase characterized by a 2Z winding number, which features double-degenerate bands in the entire Brillouin zone and two pairs of degenerate topological boundary modes. Our Letter thus overcomes a fundamental constraint on topological phases by spin classes.

关键词： Acoustics Edge states Topological insulators 1-dimensional systems Finite-element method Gauge symmetries Projective symmetries Tight-binding model

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Reply to “Comment on ‘Scattering Cancellation-Based Cloaking for the Maxwell-Cattaneo Heat Waves’”

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physical Review Applied 2021年第5期15卷 058002-058002页

作者： M. Farhat S. Guenneau P.-Y. Chen A. Alù K.N. Salama Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia UMI 2004 Abraham de Moivre-CNRS Imperial College London London SW7 2AZ United Kingdom Department of Electrical and Computer Engineering University of Illinois at Chicago Chicago Illinois 60607 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Physics Program Graduate Center City University of New York New York New York 10016 USA

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