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arXiv 2023年

作者： Cai, Jiaqi Anderson, Eric Wang, Chong Zhang, Xiaowei Liu, Xiaoyu Holtzmann, William Zhang, Yinong Fan, Fengren Taniguchi, Takashi Watanabe, Kenji Ran, Ying Cao, Ting Fu, Liang Xiao, Di Yao, Wang Xu, Xiaodong Department of Physics University of Washington SeattleWA98195 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States Department of Physics University of Hong Kong Hong Kong HKU-UCAS Joint Institute of Theoretical and Computational Physics Hong Kong International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Functional Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Department of Physics Boston College Chestnut Hill MA02467 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States

The interplay between spontaneous symmetry breaking and topology can result in exotic quantum states of matter. A celebrated example is the quantum anomalous Hall (QAH) state, which exhibits an integer quantum Hall effect at zero magnetic field thanks to its intrinsic ferromagnetism1-3. In the presence of strong electron-electron interactions, exotic fractional-QAH (FQAH) states at zero magnetic field can emerge. These states could host fractional excitations, including non-Abelian anyons – crucial building blocks for topological quantum computation4,5. Flat Chern bands are widely considered as a desirable venue to realize the FQAH state6-9. For this purpose, twisted transition metal dichalcogenide homobilayers in rhombohedral stacking have recently been predicted to be a promising material platform10-13. Here, we report experimental signatures of FQAH states in ~3.7-degree twisted MoTe2 bilayer. Magnetic circular dichroism measurements reveal robust ferromagnetic states at fractionally hole filled moiré minibands. Using trion photoluminescence as a sensor14, we obtain a Landau fan diagram which shows linear shifts in carrier densities corresponding to the v = -2/3 and -3/5 ferromagnetic states with applied magnetic field. These shifts match the Streda formula dispersion of FQAH states with fractionally quantized Hall conductance of σxy = − 23eℎ2 and − 35eℎ2 , respectively. Moreover, the v = -1 state exhibits a dispersion corresponding to Chern number -1, consistent with the predicted QAH state10-13. In comparison, several non-ferromagnetic states on the electron doping side do not disperse, i.e., are trivial correlated insulators. The observed topological states can be further electrically driven into topologically trivial states. Our findings provide clear evidence of the long-sought FQAH states, putting forward MoTe2 moiré superlattices as a fascinating platform for exploring fractional excitations. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum Hall effect

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Fabric-substrated capacitive biopotential sensors enhanced by dielectric nanoparticles

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Nano Research 2021年第9期14卷 3248-3252页

作者： Xiangjun Chen Xiaoxiang Gao Akihiro Nomoto Keren Shi Muyang Lin Hongjie Hu Yue Gu Yangzhi Zhu Zhuohong Wu Xue Chen Xinyu Wang Baiyan Qi Sai Zhou Hong Ding Sheng Xu Materials Science and Engineering Program University of California San DiegoLa JollaCA 92093USA Department of NanoEngineering University of California San DiegoLa JollaCA 92093USA Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92093USA Department of Bioengineering University of California San DiegoLa JollaCA 92093USA

Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human ***-contact,capacitive sensing electrodes prevent potential skin iritations,and are thus beneficial for long-term *** capacitive electrodes are either connected to a separate control circuit via external wires or have limited sensing capacitances,which leads to low signal *** study demonstrates a stretchable capacitive sensing device with integrated electrodes and control electronics,with enhanced signal *** electrodes and the control electronics are fabricated on a common fabric substrate for breathability and strain-limiting *** stretchable electrodes are based on an island-bridge design with a stretchability as high as-100%,and an area ratio as high as-80%.By using a dielectric calcium copper titanate(CCTO)composite as the adhesive layer,the electrode capacitance can be increased,yielding an enhanced signal-to-noise ratio(SNR)in the acquired *** device offers a convenient and comfortable approach for long-term non-contact monitoring of biopotential signals.

关键词： capacitive sensing biopotential stretchable calcium copper titanate(CCTO) signal-to-noise ratio(SNR)

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Efficient potential-tuning strategy through p-type doping for designing cathodes with ultrahigh energy density

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National science Review 2020年第11期7卷 1768-1775页

作者： Zhiqiang Wang Da Wang Zheyi Zou Tao Song Dixing Ni Zhenzhu Li Xuecheng Shao Wanjian Yin Yanchao Wang Wenwei Luo Musheng Wu Maxim Avdeev Bo Xu Siqi Shi Chuying Ouyang Liquan Chen Department of Physics Laboratory for Computational Materials PhysicsJiangxi Normal University State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering Shanghai University Soochow Institute for Energy and Materials Innovations (SIEMIS) College of PhysicsOptoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University State Key Lab of Superhard Materials College of Physics Jilin University Australian Nuclear Science and Technology Organisation School of Chemistry University of Sydney Materials Genome Institute Shanghai University Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Designing new cathodes with high capacity and moderate potential is the key to breaking the energy density ceiling imposed by current intercalation chemistry on rechargeable batteries. The carbonaceous materials provide high capacities but their low potentials limit their application to anodes. Here, we show that Fermi level tuning by p-type doping can be an effective way of dramatically raising electrode potential. We demonstrate that Li（Na）BCF;/Li（Na）B;C;F;exhibit such change in Fermi level, enabling them to accommodate Li;（Na;） with capacities of 290–400（250–320） m Ah g;at potentials of 3.4–3.7（2.7–2.9） V, delivering ultrahigh energy densities of 1000–1500 Wh kg;. This work presents a new strategy in tuning electrode potential through electronic band structure engineering.

关键词： p-type doping strategy electrochemical potential tuning Li(Na)BCF2/B2C2F2 cathodes ultrahigh energy densities

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Observation of Su-Schrieffer-Heeger Topological Model Band Structure in Integrated LNOI Coupled Ring Cavities 16

Observation of Su-Schrieffer-Heeger Topological Model Band S...

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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Dinh, Hiep X. Balcytis, Armandas Ozawa, Tomoki Ota, Yasutomo Baba, Toshihiko Iwamoto, Satoshi Mitchell, Arnan Nguyen, Thach G. Rmit University Integrated Photonics and Applications Centre MelbourneVIC3000 Australia Advanced Institute for Materials Research Tohoku University Sendai980-8577 Japan Keio University Department of Applied Physics and Physico-Informatics Yokohama223-8522 Japan Yokohama National University Department of Electrical and Computer Engineering Yokohama240-8501 Japan The University of Tokyo Research Center for Advanced Science and Technology Tokyo153-8904 Japan

We report synthetic frequency dimension Su-Schrieffer-Heeger model and its band structure observation using coupled ring cavities on an integrated photonic chip. Intra-cell and inter-cell couplings between hybridized ... 详细信息

ISBN: (纸本)9798350372076

关键词： Photonic integrated circuits

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Disentangling the physics of the attractive Hubbard model as a fully interacting model of fermions via the accessible and symmetry-resolved entanglement entropies

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Physical Review B 2024年第19期109卷 195119-195119页

作者： Tong Shen Hatem Barghathi Adrian Del Maestro Brenda M. Rubenstein Department of Chemistry Brown University Providence Rhode Island 02912 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37916 USA Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee Knoxville Tennessee 37996 USA Institute for Advanced Materials & Manufacturing University of Tennessee Knoxville Tennessee 37996 USA Department of Physics Brown University Providence Rhode Island 02912 USA

The complicated ways in which electrons interact in many-body systems such as molecules and materials have long been viewed through the lens of local electron correlation and associated correlation functions. However, quantum information science has demonstrated that more global diagnostics of quantum states like the entanglement entropy can provide a complementary and clarifying lens on electronic behavior. One particularly useful measure that can be used to distinguish between quantum and classical sources of entanglement is the accessible entanglement, the entanglement available as a quantum resource for systems subject to conservation laws, such as fixed particle number, due to superselection rules. In this work, we introduce an algorithm and demonstrate how to compute accessible and symmetry-resolved entanglements for interacting fermion systems. This is accomplished by combining an incremental version of the swap algorithm with a recursive auxiliary field quantum Monte Carlo algorithm recently developed by the authors. We apply these tools to study the pairing and charge density waves exhibited in the paradigmatic attractive Hubbard model via entanglement. We find that the particle and spin symmetry-resolved entanglements and their related full probability distribution functions show very clear—and unique—signatures of the underlying electronic behavior even when those features are less pronounced in conventional correlation functions. Overall, this work provides a systematic means of characterizing the entanglement within quantum systems that can grant a deeper understanding of the complicated electronic behavior that underlies quantum phase transitions and crossovers in many-body systems.

关键词： Cold gases in optical lattices Entanglement entropy Optical lattices & traps Quantum entanglement Electron-correlation calculations Hubbard model Quantum Monte Carlo

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Rapid and efficient synthesis of 2,2-dimethylaminobenzazoles and 2,2-dimethylaminoazoles in a sustainable way

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materials Research Innovations 2021年第2期25卷 90-94页

作者： Chakraborty, Shampa Goswami, Shyamaprosad Kheng Quah, Ching Kulkarni, Aditi Rayalu, Sadhana Environmental Materials Division National Environmental Engineering Research Institute Nagpur India Department of Chemistry Indian Institute of Engineering Science and Technology Shibpur Howrah India X-ray Crystallography Unit School of Physics Universiti Sains Malaysia Penang Malaysia

Reactions of 2–aminophenol, 2–aminobenzenethiol and other 2–substituted anilines (Scheme 1), ethylene amines and amino acid containing 1,2 amino hydroxy groups (Scheme 3) with TBTU [2–(1H–benzotriazole–1–yl)–1,1,3,3–tetramethyluroniumtetrafluoroborate], easily formed corresponding benzazoles (single crystal X–ray structure) and azoles attached with a dimethyl amino group at 2–position via a guanidine intermediate which cyclizes and aromatises by eliminating one dimethylamino group to afford benzazoles and azoles. The nobality of the synthesis is, single step and can occur at ambient temperature. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Ethylene

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Emergence of Layer Stacking Disorder in c-axis Confined MoTe2

arXiv

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arXiv 2022年

作者： Hart, James L. Bhatt, Lopa Zhu, Yanbing Han, Myung-Geun Bianco, Elisabeth Li, Shunran Hynek, David J. Schneeloch, John A. Tao, Yu Louca, Despina Guo, Peijun Zhu, Yimei Jornada, Felipe Reed, Evan J. Kourkoutis, Lena F. Cha, Judy J. Department of Materials Science and Engineering Cornell University United States Applied and Engineering Physics Cornell University United States Department of Materials Science and Engineering Stanford University United States Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory United States Department of Chemical and Environmental Engineering Yale University United States Energy Sciences Institute Yale University United States Department of Mechanical Engineering and Materials Science Yale University United States Department of Physics University of Virginia United States Kavli Institute Cornell for Nanoscale Science Cornell University United States

The layer stacking order in 2D materials strongly affects functional properties and holds promise for next generation electronic devices. In bulk, octahedral MoTe2 possesses two stacking arrangements, the Weyl semimetal Td phase, and the higher-order topological insulator 1T´ phase;however, it remains unclear if thin exfoliated flakes of MoTe2 follow the Td, 1T´, or an alternative stacking sequence. Here, we resolve this debate using atomic-resolution imaging within the transmission electron microscope. We find that the layer stacking in thin flakes of MoTe2 is highly disordered and pseudo-random, which we attribute to intrinsic confinement effects. Conversely, WTe2, which is isostructural and isoelectronic to MoTe2, displays ordered stacking even for thin exfoliated flakes. Our results are important for understanding the quantum properties of MoTe2 devices, and suggest that thickness may be used to alter the layer stacking in other 2D materials. © 2022, CC BY.

关键词： Tellurium compounds

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Giant magnetocaloric effect and hysteresis loss in MnxFe2-xP0.5Si0.5 (0.7 ≤ x ≤ 1.2) microwires at ambient temperatures

arXiv

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arXiv 2023年

作者： Luo, Lin Shen, Hongxian Zhang, Lunyong Huang, Yongjiang Sun, Jianfei Phan, Manh-Huong School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Department of Physics University of South Florida TampaFL33620 United States

Magnetocaloric microwires are very promising for energy-efficient magnetic refrigeration in micro electromechanical systems (MEMS) and nano electromechanical systems (NEMS). Creating microwires that exhibit large magnetocaloric effects around room temperature represents an important but challenging task. Here, we report a tunable giant magnetocaloric effect around room temperature in MnxFe2-xP0.5Si0.5 (0.7≤x ≤1.2) microwires by utilizing a melt-extraction technique paired with thermal treatment and chemical engineering. The isothermal magnetic entropy change (ΔSiso) and Curie temperature (TC) can be tuned by adjusting the Mn/Fe ratio. The TC varies from 351 to 190 K as x increases from 0.8 to 1.2. Among the compositions investigated, the x = 0.9 sample shows the largest value of ΔSiso = 18.3 J kg-1 K-1 for a field change of 5 T around 300 K. After subtracting magnetic hysteresis loss, a large refrigerant capacity of ~284.6 J kg-1 is achieved. Our study paves a new pathway for the design of novel magnetocaloric microwires for active magnetic refrigeration at ambient temperatures. © 2023, CC BY.

关键词： Iron compounds

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Quasiparticle Fermi surfaces of niobium and niobium-titanium alloys at high pressure

arXiv

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arXiv 2025年

作者： Jones, D. Östlin, A. Chmeruk, A. Beiuşeanu, F. Eckern, U. Vitos, L. Chioncel, L. Theoretische Physik III Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg Augsburg86135 Germany University of Augsburg Augsburg86135 Germany Faculty of Science University of Oradea Oradea410087 Romania Theoretische Physik II Institute of Physics University of Augsburg Augsburg86135 Germany Applied Materials Physics Department of Materials Science and Engineering Royal Institute of Technology Brinellvägen 23 Stockholm10044 Sweden

The electronic structure of pure niobium and the niobium-titanium alloy Nb0.44Ti0.56 in the bccphase at pressures up to 250 GPa is investigated, to reveal possible factors conducing toward the robust superconductivity reported for Ti-doped niobium upon a considerable volume reduction. We model the structural disorder using the coherent potential approximation, and the electronic correlations are taken into account using dynamical mean-field theory. At high pressure, a significant change in the topology of the Fermi surface is observed, while electronic correlations weaken with increasing pressure. Thus, the normal state of Nb0.44Ti0.56 is found to be a Fermi liquid with a well-defined Fermi surface, and well-defined quasiparticles near it. The systematic study of the impact of disorder upon the Fermi surface at such ultra high pressures allows notable insights into the nature of the electronic states near the Fermi level, i.e., within the energy scale relevant for superconducting pairing. Furthermore, our results clearly indicate the necessity of further experimental Fermi surface explorations. © 2025, CC BY.

关键词： Titanium alloys

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FM-FCN:A Neural Network with Filtering Modules for Accurate Vital Signs Extraction

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Research 2025年第1期2024卷 92-106页

作者： Fangfang Zhu Qichao Niu Xiang Li Qi Zhao Honghong Su Jianwei Shuai Department of Physics and Fujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen 361005China National Institute for Data Science in Health and Medicine and State Key Laboratory of Cellular Stress BiologyInnovation Center for Cell Signaling NetworkXiamen UniversityXiamen 361005China Vitalsilicon Technology Co.Ltd. JiaxingZhejiang 314006China School of Computer Science and Software Engineering University of Science and Technology LiaoningAnshan 114051China Yangtze Delta Region Institute of Tsinghua University ZhejiangJiaxing 314006China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou 325001China

Neural networks excel at capturing local spatial patterns through convolutional modules,but they may struggle to identify and effectively utilize the morphological and amplitude periodic nature of physiological *** this work,we propose a novel network named filtering module fully convolutional network(FM-FCN),which fuses traditional filtering techniques with neural networks to amplify physiological signals and suppress ***,instead of using a fully connected layer,we use an FCN to preserve the time-dimensional correlation information of physiological signals,enabling multiple cycles of signals in the network and providing a basis for signal ***,we introduce the FM as a network module that adapts to eliminate unwanted interference,leveraging the structure of the *** approach builds a bridge between deep learning and signal processing ***,we evaluate the performance of FM-FCN using remote *** results demonstrate that FM-FCN outperforms the second-ranked method in terms of both blood volume pulse(BVP)signal and heart rate(HR)*** substantially improves the quality of BVP waveform reconstruction,with a decrease of 20.23%in mean absolute error(MAE)and an increase of 79.95%in signal-to-noise ratio(SNR).Regarding HR estimation accuracy,FM-FCN achieves a decrease of 35.85%in MAE,29.65%in error standard deviation,and 32.88%decrease in 95%limits of agreement width,meeting clinical standards for HR accuracy *** results highlight its potential in improving the accuracy and reliability of vital sign measurement through high-quality BVP signal *** codes and datasets are available online at https://***/zhaoqi106/FM-FCN.

关键词： physiological signalsin filtering module fully convolutional network fm fcn which vital signs extraction amplify physiological signals convolutional modulesbut neural networks filtering module capturing local spatial patterns

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