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Nanodevices: Record‐Low‐Threshold Lasers Based on Atomically Smooth Triangular Nanoplatelet Perovskite (Adv. Funct. Mater. 2/2019)

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advanced Functional Materials 2019年第2期29卷

作者： Guohui Li Tao Che Xingqi Ji Shaoding Liu Yuying Hao Yanxia Cui Shengzhong Liu Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education College of Physics and Optoelectronics Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan 030024 P. R. China State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan 030006 P. R. China Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P. R. China

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Dflow, a Python framework for constructing cloud-native AI-for-science workflows

arXiv

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arXiv 2024年

作者： Liu, Xinzijian Han, Yanbo Li, Zhuoyuan Fan, Jiahao Zhang, Chengqian Zeng, Jinzhe Shan, Yifan Yuan, Yannan Xu, Wei-Hong Liu, Yun-Pei Zhang, Yuzhi Wen, Tongqi York, Darrin M. Zhong, Zhicheng Zheng, Hang Cheng, Jun Zhang, Linfeng Wang, Han DP Technology Beijing100080 China Institute of Molecular Science and Applied Chemistry School of Chemistry Xi'an Jiaotong University Xi'An710049 China Department of Mechanical Engineering The University of Hong Kong Hong Kong School of Physics Peking University Beijing100871 China AI for Science Institute Beijing100080 China HEDPS CAPT College of Engineering Peking University Beijing100871 China Laboratory for Biomolecular Simulation Research Center for Integrative Proteomics Research Department of Chemistry and Chemical Biology Rutgers University PiscatawayNJ08854-8087 United States Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China IKKEM Xiamen361005 China State Key Laboratory of Physical Chemistry of Solid Surface Collaborative Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Department of Physics University of Science and Technology of China Hefei230026 China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou215123 China Institute of Artificial Intelligence Xiamen University Xiamen361005 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100094 China

In the AI-for-science era, scientific computing scenarios such as concurrent learning and high-throughput computing demand a new generation of infrastructure that supports scalable computing resources and automated workflow management on both cloud and high-performance supercomputers. Here we introduce Dflow, an open-source Python toolkit designed for scientists to construct workflows with simple programming interfaces. It enables complex process control and task scheduling across a distributed, heterogeneous infrastructure, leveraging containers and Kubernetes for flexibility. Dflow is highly observable and can scale to thousands of concurrent nodes per workflow, enhancing the efficiency of complex scientific computing tasks. The basic unit in Dflow, known as an Operation (OP), is reusable and independent of the underlying infrastructure or context. Dozens of workflow projects have been developed based on Dflow, spanning a wide range of projects. We anticipate that the reusability of Dflow and its components will encourage more scientists to publish their workflows and OP components. These components, in turn, can be adapted and reused in various contexts, fostering greater collaboration and innovation in the scientific community. Copyright © 2024, The Authors. All rights reserved.

关键词： Reusability

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Coexistence of Ferromagnetic and Stripe-Type Antiferromagnetic Spin Fluctuations in YFe2Ge2

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Physical Review Letters 2019年第21期122卷 217003-217003页

作者： Hongliang Wo Qisi Wang Yao Shen Xiaowen Zhang Yiqing Hao Yu Feng Shoudong Shen Zheng He Bingying Pan Wenbin Wang K. Nakajima S. Ohira-Kawamura P. Steffens M. Boehm K. Schmalzl T. R. Forrest M. Matsuda Yang Zhao J. W. Lynn Zhiping Yin Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Institute of Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Materials and Life Science Division J-PARC Center Tokai Ibaraki 319-1195 Japan Institut Laue-Langevin 71 Avenue des Martyrs 38042 Grenoble Cedex 9 France Forschungszentrum Jülich GmbH. Jülich Centre for Neutron Science at ILL 71 Avenue des Martyrs 38000 Grenoble France Diamond Light Source Harwell Campus Didcot OX11 0DE United Kingdom Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Department of Materials Science and Engineering University of Maryland College Park Maryland 20742 USA Department of Physics and Center for Advanced Quantum Studies Beijing Normal University Beijing 100875 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

We report neutron scattering measurements of single-crystalline YFe2Ge2 in the normal state, which has the same crystal structure as the 122 family of iron pnictide superconductors. YFe2Ge2 does not exhibit long-range magnetic order but exhibits strong spin fluctuations. Like the iron pnictides, YFe2Ge2 displays anisotropic stripe-type antiferromagnetic spin fluctuations at (π, 0, π). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wave vector (0, 0, π). These ferromagnetic spin fluctuations are isotropic in the (H, K) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFe2Ge2 and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials.

关键词： Pairing mechanisms Spin dynamics Superconducting phase transition High-temperature superconductors Pnictides Neutron scattering

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[email protected] core-shell nanowires towards oxygen reduction reaction

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Chemical engineering Journal 2021年 421卷

作者： Qi Xue Hui-Ying Sun Ya-Nan Li Ming-Jun Zhong Fu-Min Li Xinlong Tian Pei Chen Shi-Bin Yin Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education) Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an 710062 PR China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine Chemistry School of Chemical Engineering and Technology Hainan University Haikou 570228 PR China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Nanning Guangxi 530004 PR China

Noble metal based one-dimensionally (1D) bimetallic nanostructures are attracting increasing interest in energy conversion field because of their structural advantages and tunable chemical composition. At present, the facile and efficient synthesis of high-quality Au-core noble metal-shell nanowires still maintains the challenge. Herein, we develop a feasible one-pot chemical-reduction strategy to rapidly synthesize high-quality [email protected] core–shell nanowires ( [email protected] CSNWs) in 1-naphthol ethanol solution and explore their potential application in electrocatalysis. Expermattial results show the formation core–shell structure originates from the deposition-growth of Ir atoms at preferentially generated Au nanowires surface. When using as an electrocatalyst towards oxygen reduction reaction (ORR) in alkaline media, [email protected] CSNWs show Pt-like ORR electroactivity due to the compositional synergism effect and structural advantages of 1D nanowires, accompanying with excellent durability and extremely enhanced methanol tolerance towards ORR.

关键词： Low temperature fuel cells Pt-free electrocatalyst Core-shell structure Methanol tolerance Oxygen reduction reaction

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Fabrication-induced even-odd discrepancy of magnetotransport in few-layer MnBi2Te4

arXiv

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arXiv 2023年

作者： Li, Yaoxin Wang, Yongchao Lian, Zichen Li, Hao Gao, Zhiting Xu, Liangcai Wang, Huan Lu, Rui'e Li, Longfei Feng, Yang Zhu, Jinjiang Liu, Liangyang Wang, Yongqian Fu, Bohan Yang, Shuai Yang, Luyi Wang, Yihua Xia, Tianlong Liu, Chang Jia, Shuang Wu, Yang Zhang, Jinsong Wang, Yayu Liu, Chang State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China School of Materials Science and Engineering Tsinghua University Beijing100084 China Tsinghua-Foxconn Nanotechnology Research Center Department of Physics Tsinghua University Beijing100084 China Beijing Academy of Quantum Information Sciences Beijing100193 China Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-Nano Devices Department of Physics Renmin University of China Beijing100872 China Key Laboratory of Quantum State Construction and Manipulation Ministry of Education Renmin University of China Beijing100872 China School of Mechanical and Electric Engineering Guangzhou University Guangzhou510006 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Frontier Science Center for Quantum Information Beijing100084 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Interdisciplinary Institute of Light-Element Quantum Materials Research Center for Light-Element Advanced Materials Peking University Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China College of Math and Physics Beijing University of Chemical Technology Beijing100029 China Hefei National Laboratory Hefei230088 China

The van der Waals antiferromagnetic topological insulator MnBi2Te4 represents a promising platform for exploring the layer-dependent magnetism and topological states of matter. Recently observed discrepancies between magnetic and transport properties have aroused controversies concerning the topological nature of MnBi2Te4 in the ground state. In this article, we demonstrate that fabrication can induce mismatched even-odd layer dependent magnetotransport in few-layer MnBi2Te4. We perform a comprehensive study of the magnetotransport properties in 6- and 7-septuple-layer MnBi2Te4, and reveal that both even- and odd-number-layer device can show zero Hall plateau phenomena in zero magnetic field. Importantly, a statistical survey of the optical contrast in more than 200 MnBi2Te4 flakes reveals that the zero Hall plateau in odd-number-layer devices arises from the reduction of the effective thickness during the fabrication, a factor that was rarely noticed in previous studies of 2D materials. Our finding not only provides an explanation to the controversies regarding the discrepancy of the even-odd layer dependent magnetotransport in MnBi2Te4, but also highlights the critical issues concerning the fabrication and characterization of 2D material devices. Copyright © 2023, The Authors. All rights reserved.

关键词： Fabrication

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Polarization transport in ferroelectrics

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Physical Review Applied 2023年第5期20卷 050501-050501页

作者： G.E.W. Bauer P. Tang R. Iguchi J. Xiao K. Shen Z. Zhong T. Yu S.M. Rezende J.P. Heremans K. Uchida WPI Advanced Institute for Materials Research and CSIS Tohoku University 2-1-1 Katahira Sendai 980-8577 Japan Institute for Materials Research Tohoku University 2-1-1 Katahira Sendai 980-8577 Japan Kavli Institute for Theoretical Sciences University of the Chinese Academy of Sciences Beijing 10090 China National Institute for Materials Science Tsukuba 305-0047 Japan Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China China Center of Materials Science and Optoelectronics Engineering University of the Chinese Academy of Sciences Beijing 100049 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China Departamento de Física Universidade Federal de Pernambuco Recife Pernambuco 50670-901 Brazil Department of Materials Science and Engineering The Ohio State University Columbus Ohio 43210 USA Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA Department of Physics The Ohio State University Columbus Ohio 43210 USA

The duality between electric and magnetic dipoles in electromagnetism only partly applies to condensed matter. In particular, the elementary excitations of the magnetic and ferroelectric orders, namely magnons and ferrons, respectively, have received asymmetric attention from the condensed matter community in the past. In this Perspective, we introduce and summarize the current state of the budding field of “ferronics.” We argue that the introduction of dipole-carrying elementary excitations allows the modeling of many observables and potentially leads to applications in thermal, information, and communication technologies.

关键词： Electric polarization Ferroelectricity Magnons Phonons Quasiparticles & collective excitations Transport phenomena Devices Ferroelectrics

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Efficient verification of pure quantum states with applications to hypergraph states

arXiv

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arXiv 2018年

作者： Zhu, Huangjun Hayashi, Masahito Department of Physics and Center for Field Theory and Particle Physics Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Institute for Theoretical Physics University of Cologne Cologne50937 Germany Graduate School of Mathematics Nagoya University Nagoya464-8602 Japan Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore117542 Singapore

Bipartite and multipartite entangled states are of central interest in quantum information processing and foundational studies. Efficient verification of these states, especially in the adversarial scenario, is a key to various applications, such as blind measurement-based quantum computation and quantum networks. Here we offer a general recipe to constructing efficient verification protocols for the adversarial scenario from protocols devised for the nonadversarial scenario. With this recipe, arbitrary pure states can be verified in the adversarial scenario with almost the same efficiency as in the nonadversarial scenario. In addition, we propose a simple protocol for verifying hypergraph states which requires only two distinct Pauli measurements for each party, yet its efficiency is comparable to the best protocol based on entangling measurements. For a given state, the overhead is bounded by the chromatic number and degree of the underlying hypergraph. Our protocol is dramatically more efficient than all known candidates based on local measurements, including tomography and direct fidelity estimation. It enables the verification of hypergraph states and genuine multipartite entanglement of thousands of qubits even in the adversarial scenario. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum entanglement

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Interfaces and Interfacial Layers in Inorganic Perovskite Solar Cells

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Angewandte Chemie 2021年第51期133卷

作者： Dr. Wanchun Xiang Prof. Shengzhong (Frank) Liu Dr. Wolfgang Tress Key Laboratory for Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science &Engineering Shaanxi Normal University Xi'an 710119 P. R. China Institute of Computational Physics Zurich University of Applied Sciences Wildbachstr. 21 8401 Winterthur Switzerland

Owing to their superior thermal stability, metal halide inorganic perovskite materials continue to attract interest for photovoltaics applications. The highest reported power conversion efficiency (PCE) for solar cells based on inorganic perovskites is over 20 %. As this PCE corresponds to 73 % of the theoretical limit, there remains more room for further improving the device PCEs than for improving organic–inorganic hybrid perovskite solar cells (PSCs). The main loss is in the photovoltage, which is limited by interfaces in terms of non-radiative recombination caused by traps and energy-level mismatch. Furthermore, inefficient charge extraction at interfacial contacts reduces the photocurrent and fill factor. This Minireview summarizes the recent developments in the fundamental understanding of how the interfaces and interfacial layers influence the performance of solar cells based on inorganic perovskite absorbers. An outlook for the development of highly efficient and stable inorganic PSCs from the interface point of view is also given.

关键词： charge transport layer energy-level alignment interfaces perovskites solar cells

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Correction: a novel non-vacuum packaged triaxial accelerometer with differential dual-axis resonantors and torsional elements

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Microsystem Technologies 2023年第1期30卷 45-45页

作者： Li, Jinhui Xia, Dunzhu Wang, Songli Yang, Xiuhua Zhang, Bing Key Laboratory of Micro-lnertial Instruments and Advanced Navigation Technology Ministry of Education Nanjing China School of Instrument Science and Engineering Southeast University Nanjing China Xi’an Flight Automatic Control Research Institute of Aviation Industry Xi’an China

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Transition from Sign-Reversed to Sign-Preserved Cooper-Pairing Symmetry in Sulfur-Doped Iron Selenide Superconductors

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Physical Review Letters 2016年第19期116卷 197004-197004页

作者： Qisi Wang J. T. Park Yu Feng Yao Shen Yiqing Hao Bingying Pan J. W. Lynn A. Ivanov Songxue Chi M. Matsuda Huibo Cao R. J. Birgeneau D. V. Efremov Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Heinz Maier-Leibnitz Zentrum (MLZ) Technische Universität München D-85748 Garching Germany NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Institut Laue-Langevin 71 Avenue des Martyrs 38042 Grenoble Cedex 9 France Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831-6393 USA Department of Physics University of California Berkeley California 94720 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA IFW Dresden Helmholtzstraße 20 01069 Dresden Germany Collaborative Innovation Center of Advanced Microstructures Fudan University Shanghai 200433 China

An essential step toward elucidating the mechanism of superconductivity is to determine the sign or phase of the superconducting order parameter, as it is closely related to the pairing interaction. In conventional superconductors, the electron-phonon interaction induces attraction between electrons near the Fermi energy and results in a sign-preserved s-wave pairing. For high-temperature superconductors, including cuprates and iron-based superconductors, prevalent weak coupling theories suggest that the electron pairing is mediated by spin fluctuations which lead to repulsive interactions, and therefore that a sign-reversed pairing with an s± or d-wave symmetry is favored. Here, by using magnetic neutron scattering, a phase sensitive probe of the superconducting gap, we report the observation of a transition from the sign-reversed to sign-preserved Cooper-pairing symmetry with insignificant changes in Tc in the S-doped iron selenide superconductors KxFe2−y(Se1−zSz)2. We show that a rather sharp magnetic resonant mode well below the superconducting gap (2Δ) in the undoped sample (z=0) is replaced by a broad hump structure above 2Δ under 50% S doping. These results cannot be readily explained by simple spin fluctuation-exchange pairing theories and, therefore, multiple pairing channels are required to describe superconductivity in this system. Our findings may also yield a simple explanation for the sometimes contradictory data on the sign of the superconducting order parameter in iron-based materials.

关键词： Chalcogenides Superconductors Neutron scattering

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