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Superconductivity in Trilayer Nickelate La4Ni3O10 under Pressure

Physical Review X 2025年第2期15卷 021005-021005页

作者： Mingxin Zhang Cuiying Pei Di Peng Xian Du Weixiong Hu Yantao Cao Qi Wang Juefei Wu Yidian Li School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments (MFree) Institute for Shanghai Advanced Research in Physical Sciences (SHARPS) Shanghai 201203 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Key Lab for Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and Technology Lanzhou University Lanzhou 730000 China Songshan Lake Materials Laboratory Dongguan 523808 China ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 201210 China

Nickelate superconductors have attracted a great deal of attention over the past few decades due to their similar crystal and electronic structures with high-temperature cuprate superconductors. Here, we report superconductivity in a pressurized Ruddlesden-Popper phase single crystal La4Ni3O10(n=3) and its interplay with the density wave order in the phase diagram. With increasing pressure, the density wave order, as indicated by the anomaly in the resistivity, is progressively suppressed, followed by the emergence of superconductivity around 25 K under the I4/mmm space group. The susceptibility measurements confirm bulk superconductivity with a volume fraction exceeding 80%. Moreover, theoretical analysis unveils that antiferromagnetic superexchange interactions can serve as the effective pairing interaction for the emergence of superconductivity in pressurized La4Ni3O10. Our research provides a new platform for the investigation of the unconventional superconductivity mechanism in Ruddlesden-Popper trilayer perovskite nickelates.

关键词： Single crystals

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Photoinduced large polaron transport and dynamics in organic-inorganic hybrid lead halide perovskite with terahertz probes

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Light(science & Applications) 2022年第8期11卷 1853-1864页

作者： Zuanming Jin Yan Peng Yuqing Fang Zhijiang Ye Zhiyuan Fan Zhilin Liu Xichang Bao Heng Gao Wei Ren Jing Wu Guohong Ma Qianli Chen Chao Zhang Alexey VBalakin Alexander PShkurinov Yiming Zhu Songlin Zhuang Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai200093China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao266101China Physics Department Materials Genome InstituteState Key Laboratory of Advanced Special SteelShanghai Key Laboratory of High Temperature SuperconductorsInternational Centre of Quantum and Molecular StructuresShanghai UniversityShanghai200444China Shanghai Institute of Technical Physics Chinese Academy of SciencesYutian Road 500ShanghaiChina Department of Physics Shanghai University99 Shangda RoadShanghai200444China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghaiChina School of Physics University of WollongongWollongongNSW2522Australia Department of Physics and International Laser Center Lomonosov Moscow State UniversityLeninskie Gory 1Moscow19991Russia ILIT RAS-Branch of the FSRC《Crystallography and Photonics》RAS Svyatoozerskaya 1140700ShaturaMoscow RegionRussia

Organic-inorganic hybrid metal halide perovskites(MHPs)have attracted tremendous attention for optoelectronic *** long photocarrier lifetime and moderate carrier mobility have been proposed as results of the large polaron formation in ***,it is challenging to measure the effective mass and carrier scattering parameters of the photogenerated large polarons in the ultrafast carrier recombination ***,we show,in a one-step spectroscopic method,that the optical-pump and terahertz-electromagnetic probe(OPTP)technique allows us to access the nature of interplay of photoexcited unbound charge carriers and optical phonons in polycrystalline CH_(3)NH_(3)PbI_(3)(MAPbI_(3))of about 10μm grain ***,we demonstrate a direct spectral evidence of the large polarons in polycrystalline MAPbI_(3).Using the Drude-Smith-Lorentz model along with the Frӧhlich-type electron-phonon(e-ph)coupling,we determine the effective mass and scattering parameters of photogenerated polaronic *** discover that the resulting moderate polaronic carrier mobility is mainly influenced by the enhanced carrier scattering,rather than the polaron mass ***,the formation of large polarons in MAPbI_(3)polycrystalline grains results in a long charge carrier lifetime at room *** results provide crucial information about the photo-physics of MAPbI3 and are indispensable for optoelectronic device development with better performance.

关键词： polaron perovskite inorganic

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A neuro-observer-based optimal control for nonaffine nonlinear systems with control input saturations

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Control Theory and technology 2021年第2期19卷 283-294页

作者： Behzad Farzanegan Mohsen Zamani Amir Abolfazl Suratgar Mohammad Bagher Menhaj Distributed Intelligent Optimization Research Lab Department of Electrical EngineeringAmirkabir University of TechnologyTehranIran Computational Intelligence Lab Department of Electrical EngineeringAmirkabir University of TechnologyTehranIran The School of Electrical Engineering and Computer Science The University of NewcastleNewcastleAustralia Department of Medical Physics and Engineering Shiraz University of Medical SciencesShirazIran

In this study,an adaptive neuro-observer-based optimal control(ANOPC)policy is introduced for unknown nonaffine nonlinear systems with control input ***–Jacobi–Bellman(HJB)framework is employed to minimize a non-quadratic cost function corresponding to the constrained control *** consists of both analytical and algebraic *** the analytical part,first,an observer-based neural network(NN)approximates uncertain system dynamics,and then another NN structure solves the HJB *** the algebraic part,the optimal control input that does not exceed the saturation bounds is *** weights of two NNs associated with observer and controller are simultaneously updated in an online *** ultimately uniformly boundedness(UUB)of all signals of the whole closed-loop system is ensured through Lyapunov’s direct ***,two numerical examples are provided to confirm the effectiveness of the proposed control strategy.

关键词： Input constraints Optimal control Neural networks Nonaffine nonlinear systems Reinforcement learning Unknown dynamics

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Stable phases of freestanding monolayer TiO2: Emergence of out-of-plane ferroelectricity

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Physical Review B 2024年第16期109卷 165435-165435页

作者： Xiangtian Bu Haitao Liu Yuanchang Li Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) and Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China National Key Laboratory of Computational Physics Beijing 100088 China

Despite being successfully synthesized [Zhang et al., Nat. Mater. 20, 1073 (2021)], the monolayer structure of stable hexagonal TiO2 is unknown, and it is not even clear whether it can exist in a freestanding form. Through first-principles calculations, we have identified two previously uncharted stable structures, namely, distorted 1×3 1T−TiO2 and 3×3 1T−TiO2, both of which are energetically more favorable than commonly adopted 1H and 1T phases. Here, structural distortions are characterized by the out-of-plane shifts of Ti atoms due to the pseudo-Jahn-Teller interactions, which break one and all two inversion symmetries of 1T configuration. As a consequence, the 1×3 1T remains centrosymmetric, while the 3×3 1T exhibits out-of-plane ferroelectricity. Electronic structure calculations show that both are wide-band-gap semiconductors with band gaps larger than their bulk counterparts. In this paper, we not only deepen the understanding of structural instability in wide-gap semiconductors but also add a member to the rare family of two-dimensional out-of-plane ferroelectrics.

关键词： Crystal structure Ferroelectricity Pseudo Jahn-Teller effect Monolayer films First-principles calculations

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Honeycomb Lattice in Metal-Rich Chalcogenide Fe_(2)Te

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Chinese physics Letters 2021年第11期38卷 44-47页

作者： Jia-Qi Guan Li Wang Pengdong Wang Wei Ren Shuai Lu Rong Huang Fangsen Li Can-Li Song Xu-Cun Ma Qi-Kun Xue State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Frontier Science Center for Quantum Information Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China Southern University of Science and Technology Shenzhen 518055China

Two-dimensional honeycomb crystals have inspired intense research interest for their novel properties and great potential in electronics and optoelectronics. Here, through molecular beam epitaxy on SrTiO_3(001), we report successful epitaxial growth of metal-rich chalcogenide Fe_(2)Te, a honeycomb-structured film that has no direct bulk analogue, under Te-limited growth conditions. The structural morphology and electronic properties of Fe_(2)Te are explored with scanning tunneling microscopy and angle resolved photoemission spectroscopy, which reveal electronic bands cross the Fermi level and nearly flat bands. Moreover, we find a weak interfacial interaction between Fe_(2)Te and the underlying substrates, paving a newly developed alternative avenue for honeycomb-based electronic devices.

关键词： red STM Honeycomb Lattice in Metal-Rich Chalcogenide Fe_(2)Te

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MXene confined microcapsules for uremic toxins elimination

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Aggregate 2024年第4期5卷 236-244页

作者： Xiaomin Ye Chaoyu Yang Li Wang Qihui Fan Luoran Shang Fangfu Ye Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhouZhejiangChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina Shanghai Xuhui Central Hospital Zhongshan-Xuhui Hospitalthe Shanghai Key Laboratory of Medical Epigeneticsthe International Co-laboratory of Medical Epigenetics and Metabolism(Ministry of Science and Technology)Institutes of Biomedical SciencesFudan UniversityShanghaiChina

Adsorbents with high adsorption efficiency and excellent biosafety for biomedical applications are highly *** is a promising candidate owning these advantages,yet pristine MXene faces dilemmas including insufficient utility of sur-face site as well as limited ***,we develop MXene-encapsulated porous microcapsules via *** microcapsules have a biomass hydrogel shell that provides robust support for MXene in the core,by which the microcapsules are endowed with high MXene dosage and remarkable ***,the MXene nanoflakes assemble into a three-dimensional network via metal ion-induced gelation,thereby avoiding restacking and significantly improving surface ***,a freeze-pretreatment of the microcapsules during preparation results in the formation of a macroporous structure in the shell,which can facilitate the diffusion of the target *** features,combined with additional magneto-responsiveness rendered by the incorporation of magnetic nanoparticles,contribute to prominent performances of the microcapsules in cleaning uremia toxins including creatinine,urea,and uric ***,it is anticipated that the MXene-encapsulated microcapsules will be promising adsorbents in dialysis-related applications,and the combination of microfluidic encapsulation with metal ion gelation will provide a novel approach for construction of hybrid MXene materials with desired functions.

关键词： adsorption microcapsules microfluidics MXene uremic toxins

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Hyperspectral Classification of Coastal Wetland Based on Multi-objective CNN and Decision Fusion Model 11

Hyperspectral Classification of Coastal Wetland Based on Mul...

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11th International Conference on Information Systems and Computing technology, ISCTech 2023

作者： Hu, Yabin Yang, Junfang Ren, Guangbo Ma, Yi Wang, Jianbu Zhu, Xiaoheng Ministry of Natural Resources Lab of Marine Physics and Remote Sensing First Institute of Oceanography Qingdao China Natl. Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology Xian China China University of Petroleum College of Oceanography and Space Informatics Qingdao China ShanDong University of Science and Technology College of Geodesy and Geomatics Qingdao China

ISBN: (纸本)9798350342406

Coastal wetland play an irreplaceable role in maintaining biodiversity and improving climate. In this paper, we proposed a hyperspectral classification algorithm of coastal wetland based on multi-objective Convolutional Neural Networks (CNN) and decision fusion model. The algorithm is named that the multi-objective spatial-spectral CNN classification with binary morphological strategy decision fusion model algorithm (MB2SCNN-BMSDF). The multi-objective hyperspectral feature band selection model of coastal wetland based on spectral deviation algorithm is developed and constructed to effectively obtain hyperspectral sensitive bands for single target surface object types. On this basis, a CNN hyperspectral classification model that integrates multi-objective spatial spectral information, and a binary morphological decision fusion algorithm that combines spatial position information and fuzzy membership degrees are proposed, which solves the problems of salt and pepper noise and sand eye effect in the classification process, and reduces noise information. The results showed that the CNN classification of multi-objective spatial spectral information and the decision fusion model of binary morphology strategy have better classification effect and performance. © 2023 IEEE.

关键词： Biodiversity

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Recent advances in the synthesis of non-carbon two-dimensional electrode materials for the aqueous electrolyte-based supercapacitors

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Chinese Chemical Letters 2021年第12期32卷 3733-3752页

作者： Hongfei Wang Yijun Zhong Jiqiang Ning Yong Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Supercapacitors(SCs) with high power density and long cycling span life are demanding energy storage devices that will be an attractive power solution to modern electronic and electrical applications. Numerous theoretical and experimental works have been devoted to exploring various possibilities to increase the functionality and the specific capacitance of electrodes for SCs. Non-carbon two-dimensional(2D)materials have been considered as encouraging electrode candidates for their chemical and physical advantages such as tunable surface chemistry, high electronic conductivity, large mechanical strength, more active sites, and dual non-faradaic and faradaic electrochemical performances. Besides, these 2D materials also play particular roles in constructing highway channels for fast ion diffusion. This concise review summarizes cutting-edge progress of some representative 2D non-carbon materials for the aqueous electrolyte-based SCs, including transition metal oxides(TMOs), transition metal hydroxides(TMHs), transition metal chalcogenides(TMCs), MXenes, metal-organic frameworks(MOFs) and some emerging materials. Different synthetic methods, effective structural designs and corresponding electrochemical performances are reviewed in detail. And we finally present a detailed discussion of the current intractable challenges and technical bottlenecks, and highlight future directions and opportunities for the development of next-generation high-performance energy storage devices.

关键词： Supercapacitors 2D non-carbon materials Aqueous electrolyte High power density Long cycling span life

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Mechanism of the High Pec Performance of B-Doped Tio2 Nanotube Arrays: Highly Reactive Surface Defects and Lattice Stress

SSRN

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SSRN 2023年

作者： Zhang, Wanggang Tian, Rufeng Wang, Jian Liu, Yiming Mai, Wenjie College of Materials Science and Engineering Taiyuan University of Technology Taiyuan Shanxi Taiyuan030024 China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou Guangdong510632 China

Although the in-situ preparation B doped TiO2 nanotube arrays by anodic oxidation has become one of the most common means to improve the photocatalytic decomposition of water by TNAs. However, the mechanism of the role of the B-doping-induced defect state in the PEC process is still unclear. Therefore, this paper reveals the underlying reasons for the high PEC reactivity and stability maintained by the B-doping-induced defective states by comparing in detail the differences in carrier behavior and surface reactivity in the PEC process between the B-doping-induced and the NaBH4 reduction-treated defective states. DFT calculations show that B-doping can effectively reduce the generation energy of Ti3+/Vo vacancies on the surface of TiO2(101) and enhance the adsorption energy of defects on its surface for H2O and OH radicals. Moreover, due to the presence of B atoms, the surface defects can always maintain high adsorption of water molecules and OH, and will not be deactivated by the healing of oxygen vacancies, which ensures the stability and activity of the catalyst. Meanwhile, B doping induced lattice stress form internal electric field, which ensures the efficient separation of carriers in the bulk phase and avoids the negative effect of bulk phase defects on carrier separation. © 2023, The Authors. All rights reserved.

关键词： Surface defects

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Numerical Modelling for the Evaluation of Dispersion Properties for Hexagonal Lattice Structures

Numerical Modelling for the Evaluation of Dispersion Propert...

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2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Petek, Martin Vásquez, Jorge Alberto Tobón Valerio, Guido Mesa, Francisco Quevedo-Teruel, Oscar Vipiana, Francesca DET Politecnico di Torino Torino Italy Lab. de Génie Électrique et Électronique de Paris Sorbonne Université Paris France Dpt. of Applied Physics 1 Universidad de Sevilla Seville Spain Division for Electromagnetic Engineering and Fusion Science KTH Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9798350364774

In this work, we present a multimodal transfer matrix method for obtaining the eigensolutions in the complete irreducible Brillouin zone for hexagonal lattices. The method is compared in terms of accuracy and speed to a commercial software and to a method-of-moments implementation, and is found to be as accurate but faster. © 2024 IEEE.

关键词： Transfer matrix method

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