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MoS_(2) nanoflowers and PEDOT:PSS nanocomposite enabling wearable dual-mode pressure sensors

Science China(Technological Sciences) 2024年第6期67卷 1737-1747页

作者： WANG FengMing YANG WeiJia MA Ke SHEN GengZhe SU DaoJian LI BaiJun WANG ShuangPeng QIN BoLong ZHANG Chi XIN Yue CAO XiaoBing HE Xin School of Applied Physics and Materials Wuyi UniversityJiangmen529020China Biomaterials R&D Center Zhuhai Institute of Advanced TechnologyChinese Academy of SciencesZhuhai519003China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao999078China

A versatile sensing platform employing inorganic MoS_(2) nanoflowers and organic poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been investigated to develop the resistive and capacitive force-sensitive *** microstructure of the sensing layer heightens the sensitivity and response time of the dual-mode pressure sensors by augmenting electron pathways and inner stress in response to mechanical ***,the capacitive and resistive sensors exhibit sensitivities of 0.37 and 0.12 kPa^(-1),respectively,while demonstrating a remarkable response time of approximately 100 ***,it is noteworthy that the PEDOT:PSS layer exhibits excellent adhesion to polydimethylsiloxane(PDMS)substrates,which contributes to the development of highly robust force-sensitive sensors capable of enduring more than 10000loading/unloading *** combination of MoS_(2)/PEDOT:PSS layers in these dual-mode sensors has shown promising results in detecting human joint movements and subtle physiological ***,the sensors have achieved a remarkable precision rate of 98%in identifying target *** outcomes underscore the significant potential of these sensors for integration into applications such as electronic skin and human-machine interaction.

关键词： MoS_(2)/PEDOT:PSS nanocomposite force-sensitive sensor multi-scaled microstructure physiological signals monitoring object grasping recognition

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Manipulating Hubbard-type Coulomb blockade effect of metallic wires embedded in an insulator

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National Science Review 2023年第3期10卷 127-133页

作者： Xing Yang Zhao-Long Gu Huimin Wang Jing-Jing Xian Sheng Meng Naoto Nagaosa Wen-Hao Zhang Hai-Wen Liu Zi-Heng Ling Kai Fan Zhi-Mo Zhang Le Qin Zhi-Hao Zhang Yan Liang Jian-Xin Li Ying-Shuang Fu School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences RIKEN Center for Emergent Matter Science(CEMS) Department of Applied Physics University of Tokyo Center for Advanced Quantum Studies Department of Physics Beijing Normal University Collaborative Innovation Center of Advanced Microstructures Nanjing University Hubei Key Laboratory of Gravitation and Quantum Physics Huazhong University of Science and Technology Wuhan Institute of Quantum Technology

Correlated states have emerged in low-dimensional systems owing to enhanced Coulomb *** these states requires atomic-scale characterization and delicate control ***,spectroscopic imaging-scanning tunneling microscopy was employed to investigate the correlated states residing in 1D electrons of the monolayer and bilayer MoSe2 mirror twin boundary(MTB).The Coulomb energies,determined by the wire length,drive the MTB into two types of ground states with distinct respective out-of-phase and in-phase charge *** two ground states can be reversibly converted through a metastable zero-energy state with in situ voltage pulses,which tune the electron filling of the MTB via a polaronic process,substantiated by first-principles *** Hubbard model calculation with an exact diagonalization method reveals the ground states as correlated insulators from an on-site U-originated Coulomb interaction,dubbed the Hubbard-type Coulomb blockade *** study lays a foundation for understanding and tailoring correlated physics in complex systems.

关键词： STM one-dimensional Coulomb effect electron correlation Hubbard

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Surface lattice carbon cycles the reverse water–gas shift reaction

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Science China Chemistry 2025年第6期68卷 2209-2211页

作者： Jun Wang Jianyong Feng Zhaosheng Li Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State Microstructures School of PhysicsNanjing University Jiangsu Key Laboratory for Nano Technology College of Engineering and Applied Sciences Nanjing University

The reverse water–gas shift（RWGS） reaction combined with Fischer–Tropsch synthesis establishes a promising tandem catalytic system for transforming CO2into valuable chemicals and fuels [1,2]. However, the techno-economic assessment suggests that the RWGS reaction becomes viable and economically competitive only when catalysts with 100%CO selectivity（thus eliminating the downstream separation step）, high activity, sufficiently long operational durability,and ideally produced from earth-abundant materials and energy-efficient routes, are available [3].

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Ferromagnetic state with large magnetic moments realized in epitaxially strained Sr3Ru2O7 films

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Physical Review B 2024年第12期109卷 L121113-L121113页

作者： Ren Oshima Tatsuto Hatanaka Shinichi Nishihaya Takuya Nomoto Markus Kriener Takahiro C. Fujita Masashi Kawasaki Ryotaro Arita Masaki Uchida Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan Research Center for Advanced Science and Technology the University of Tokyo Tokyo 153-8904 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Department of Applied Physics the University of Tokyo Tokyo 113-8656 Japan

Technical advancements in oxide molecular beam epitaxy (MBE) have opened new avenues for studying various quantum transport phenomena in correlated transition-metal oxides, as exemplified by the exotic superconductivity of Sr2RuO4 and quantum oscillations of SrRuO3. On the other hand, film research of another Ruddlesden-Popper strontium ruthenate Sr3Ru2O7, which exhibits a unique quantum phase related to metamagnetism in bulk systems, has not progressed well. Here, we report the fabrication of high-quality Sr3Ru2O7 thin films by oxide MBE and the observation of a strain-induced ferromagnetic ground state. The change in magnetic exchange coupling evaluated by first-principles calculations indicates a systematic relation between the compression of the c-axis length and induced ferromagnetism. Giant epitaxial strain in high-quality films will be a key to a comprehensive understanding of the magnetism in Ruddlesden-Popper strontium ruthenates Srn+1RunO3n+1, which sensitively depends on the ratio of in-plane to out-of-plane Ru-Ru distances.

关键词： Epitaxial strain Ruthenates First-principles calculations Molecular beam epitaxy

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Spectroscopy and scattering matrices with nitrogen atom:Rydberg states and optical oscillator strengths

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Chinese physics B 2022年第4期31卷 261-266页

作者： Yuhao Zhu Rui Jin Yong Wu Jianguo Wang Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Center for Free-Electron Laser Science DESYHamburg 22607Germany HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100084China

The scattering matrices of e+N^(+)with J^(π)=1.5^(+)in discrete energy regions are calculated using the eigenchannel R-matrix *** obtain good parameters of multichannel quantum defect theory(MQDT)that vary smoothly as the function of the energy resulting from the analytical continuation property of the scattering *** employing the MQDT,all discrete energy levels for N could be calculated accurately without missing *** MQDT parameters(i.e.,scattering matrices)can be calibrated with the available precise spectroscopy *** this work,the optical oscillator strengths for the transition between the ground state and Rydberg series are obtained,which provide rich data for the diagnostic analysis of plasma.

关键词： eigenchannel R-matrix oscillator strengths

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Spin magnetization in unconventional antiferromagnets with collinear and non-collinear spins

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Science China(physics,Mechanics & Astronomy) 2025年第4期68卷 161-170页

作者： Lun-Hui Hu Song-Bo Zhang Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Department of Applied Physics School of ScienceAalto UniversityAalto FI-00076Finland Hefei National Laboratory Hefei 230088China International Center for Quantum Design of Functional Materials(ICQD) University of Science and Technology of ChinaHefei 230026China

Unconventional antiferromagnets(AFMs)with non-relativistic spin-splitting,such as the recently discovered altermagnet,have recently gained significant interest due to their potential for novel quantum phenomena and spintronic *** compensated magnetization in unconventional AFMs is protected by spin-space *** this work,we explore the symmetrybreaking effects and identify three distinct mechanisms for inducing net spin magnetizations in unconventional AFMs with collinear or non-collinear spins:(1)finite size effect,(2)extrinsic spin canting effect,and(3)irradiation with circularly polarized *** show that the induced spin magnetizations are controllable and manifest as diverse intriguing *** the finite size system,the confined direction of a two-dimensional AM creates quantum-well-like subbands that determine the spin *** effect can be experimentally probed by measuring the spin density of states and the spin-polarization of Andreev-bound states within planar Josephson *** the case of spin canting effect,it leads to peculiar anisotropic and non-monotonic behaviors in the superconducting proximity ***,with circularly polarized light,spin magnetization is driven by the polarized light and the chirality of non-collinear magnetic order,thus offering a direct means of detecting the chirality of magnetic order in real *** findings provide valuable insight into understanding and probing the spin magnetization in unconventional AFM materials.

关键词： altermagntism chiral antiferromagnetism Josephson junction light-matter interaction anomalous Hall effect

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Berry curvature derived negative magnetoconductivity observed in type-II magnetic Weyl semimetal films

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Physical Review B 2024年第12期109卷 L121108-L121108页

作者： Ayano Nakamura Shinichi Nishihaya Hiroaki Ishizuka Markus Kriener Mizuki Ohno Yuto Watanabe Masashi Kawasaki Masaki Uchida Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Department of Applied Physics The University of Tokyo Tokyo 113-8656 Japan

Here we study nonmonotonic features which appear both in magnetoresistivity and anomalous Hall resistivity during the simple magnetization process, by systematically measuring type-II magnetic Weyl semimetal EuCd2Sb2 films over a wide carrier density range. We find that a positive magnetoresistivity hump can be explained as manifestation of a field-linear term in the generalized magnetoconductivity formula including the Berry curvature. As also confirmed by model calculation, the term can be negative and pronounced near the Weyl point energy in the case that the Weyl cones are heavily tilted. Our findings demonstrate extensive effects of the Berry curvature on various magnetotransport in magnetic Weyl semimetals beyond the anomalous Hall effect.

关键词： Transport phenomena Thin films Weyl semimetal Molecular beam epitaxy

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Efficient microresonator frequency combs

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eLight 2024年第1期4卷 76-89页

作者： Qi‑Fan Yang Yaowen Hu Victor Torres‑Company Kerry Vahala State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and Frontiers Science Center for Nano‑optoelectronics School of PhysicsPeking UniversityBeijingChina John Paulson School of Engineering and applied science Harvard UniversityCambridgeBostonUSA Department of Microtechnology and Nanoscience Chalmers University of TechnologyGothenburgSweden T.J.Watson Laboratory of Applied Physics California Institute of TechnologyPasadenaUSA

The rapid development of optical frequency combs from their table-top origins towards chip-scale platforms has opened up exciting possibilities for comb functionalities outside *** nonlinear processes in microresonators have emerged as a mainstream comb-generating mechanism with compelling advantages in size,weight,and power *** established understanding of gain and loss in nonlinear microresonators,along with recently developed ultralow-loss nonlinear photonic circuitry,has boosted the optical energy conversion efficiency of microresonator frequency comb(microcomb)devices from below a few percent to above 50%.This review summarizes the latest advances in novel photonic devices and pumping strategies that contribute to these milestones of microcomb *** resulting benefits for high-performance integration of comb applications are also discussed before summarizing the remaining challenges.

关键词： Optical frequency comb Optical microresonator Nonlinear photonics

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Magnetic field annealing of FeCo-based amorphous alloys to enhance thermal stability and Curie temperature

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Rare Metals 2023年第6期42卷 2000-2006页

作者： Zai-Dao Li Wei-Wei Zhang Ge-Tian Li Song-Song Li Hong-Sheng Ding Tao Zhang Yu-Jun Song Center for Modern Physics Technology Department of Applied PhysicsBeijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceUniversity of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Beihang UniversityBeijing100191China

Annealing temperatures and applied magnetic fields are two important parameters for the performance modification of magnetic *** article investigated the effect of different annealing temperatures on crystallization condition,magnetic properties and thermal stability of the amorphous magnetic alloy Co_(36)Fe_(36)Si_(4.8)B1_(9.2)Nb_(4)(at%).Results indicate that the annealing temperature can significantly affect the size and content of precipitated nanocrystals in the amorphous alloy,and the precipitation of nanocrystalline phases can result in the distinct change of magnetic properties and Curie *** the annealing was performed at 595 ℃ for 30 min under an applied transverse external magnetic field of 9550.0A·m^(-1),the amorphous alloy shows excellent soft magnetic properties with the saturation magnetization of alloy reaching 110.00 mA·m^(2)·g^(-1),the residual magnetic induction intensity of 4 × 10^(-6) T and the coercivity as low as57.3 A·m^(-1).Furthermore,the Curie temperature of the field-annealed samples can reach up to 440 0C,approximately 58℃ higher than that of the as-quenched species.

关键词： Soft magnetic alloys Amorphous alloy Field annealing

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A low Mach number asymptotic analysis of dissipation-reducing methods for curing shock instability

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applied Mathematics and Mechanics(English Edition) 2025年第4期46卷 723-744页

作者： Hongping GUO Xun WANG Zhijun SHEN National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing100088China Faculty of Mathematics Baotou Teachers’CollegeBaotouInner Mongolia Autonomous Region014030China School of Mathematical Sciences Peking UniversityBeijing100871China PKU-Changsha Institute for Computing and Digital Economy Changsha410205China Center for Applied Physics and Technology Peking UniversityBeijing100871China

We are intrigued by the issues of shock instability,with a particular emphasis on numerical schemes that address the carbuncle phenomenon by reducing dissipation rather than increasing *** a specific class of planar flow fields where the transverse direction exhibits vanishing but non-zero velocity components,such as a disturbed onedimensional(1D)steady shock wave,we conduct a formal asymptotic analysis for the Euler system and associated numerical *** analysis aims to illustrate the discrepancies among various low-dissipative numerical ***,a numerical stability analysis of steady shock is undertaken to identify the key factors underlying shock-stable *** verify the stability mechanism,a consistent,low-dissipation,and shock-stable HLLC-type Riemann solver is presented.

关键词： Riemann solver numerical shock instability low Mach number HLLC

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