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MPd5 kagome superconductors studied by density functional calculations

Physical Review B 2025年第14期111卷 144511-144511页

作者： Dan Li Zhengxuan Wang Panshi Jing Mehrdad Shiri Kun Wang Chunlan Ma Shijing Gong Chuanxi Zhao Tianxing Wang Xiao Dong Lin Zhuang Wuming Liu Yipeng An School of Physics Henan Normal University Xinxiang 453007 China Department of Physics University of Miami Coral Gables Florida 33146 USA School of Physics and Technology Suzhou University of Science and Technology Suzhou 215009 China Department of Physics East China Normal University Shanghai 200062 China Department of Physics Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou 510632 China State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou 510275 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Henan Key Laboratory of Advanced Semiconductor & Functional Device Integration Henan Normal University Xinxiang 453007 China

Kagome materials, which are composed of hexagons tiled with a shared triangle, have inspired enormous interest due to their unique structures and rich physical properties; exploring superconducting material systems with new kagome structures is still an important research direction. Here, we predict a type of kagome superconductor, MPd5 (M is a group-IIA metal element), and identify that it exhibits coexistence of superconductivity and nontrivial topological properties. We uncover its phonon-mediated superconductivity by the density functional theory for superconductors, predicting the superconducting transition temperatures (Tc) of 2.64, 2.03, and 1.50 K for CaPd5, SrPd5, and BaPd5, respectively. These Tc can be effectively tuned through the application of external pressure and electron doping. The present results also demonstrate that MPd5 have topological properties; e.g., CaPd5 shows topological nontrivial intersection near the Fermi level (EF). Our results indicate that MPd5 materials can be an emerging material platform with rich exotic physics in their kagome structures, and render themselves excellent candidates for superconducting and advanced functional materials that could be utilized in topological quantum computing and information technology.

关键词： Organic superconducting materials

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Applications of MXenes in human-like sensors and actuators

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Nano Research 2023年第4期16卷 5767-5795页

作者： Jinbo Pang Songang Peng Chongyang Hou Xiao Wang Ting Wang Yu Cao Weijia Zhou Ding Sun Kai Wang Mark H.Rümmeli Gianaurelio Cuniberti Hong Liu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongUniversity of JinanJinan 250022China Institute for Materials Science and Max Bergmann Center of Biomaterials Technische Universität DresdenDresden 01069Germany Center for Advancing Electronics Dresden Technische Universität DresdenDresden 01069Germany Dresden Center for Computational Materials Science Technische Universität DresdenDresden 01062Germany Dresden Center for Intelligent Materials(GCL DCIM) Technische Universität DresdenDresden 01062Germany High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Microelectronic Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353China School of Bioengineering Qilu University of TechnologyShandong Academy of ScienceJinan 250353China Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Ministry of Education) Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Weihai Innovation Research InstituteQingdao UniversityQingdao 266000China School of Electrical and Computer Engineering Jilin Jianzhu UniversityChangchun 130118China Institute for Complex Materials Leibniz Institute for Solid State and Materials Research Dresden(IFW Dresden)20 Helmholtz StrasseDresden 01069Germany College of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006China Key L

Human beings perceive the world through the senses of sight,hearing,smell,taste,touch,space,and *** first five senses are prerequisites for people to *** sensing organs upload information to the nervous systems,including the brain,for interpreting the surrounding ***,the brain sends commands to muscles reflexively to react to stimuli,including light,gas,chemicals,sound,and ***,as an emerging two-dimensional material,has been intensively adopted in the applications of various sensors and *** this review,we update the sensors to mimic five primary senses and actuators for stimulating muscles,which employ MXene-based film,membrane,and composite with other functional ***,a brief introduction is delivered for the structure,properties,and synthesis methods of ***,we feed the readers the recent reports on the MXene-derived image sensors as artificial retinas,gas sensors,chemical biosensors,acoustic devices,and tactile sensors for electronic ***,the actuators of MXene-based composite are ***,future opportunities are given to MXene research based on the requirements of artificial intelligence and humanoid robot,which may induce prospects in accompanying healthcare and biomedical engineering applications.

关键词： MXenes sensors actuators gas sensors biosensors tactile sensors sound sensors artificial retina

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Modulus-Modulated Nanogenerator with Remarkable Piezoelectricity

SSRN

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SSRN 2024年

作者： Gao, Guoqi Li, Xiao Yuan, Chongxiao Zhou, Hengqing Sun, Huajun Liu, Xiaofang School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device Integration School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Advanced Ceramics Institute of Zibo New High-Tech Industrial Development Zone Zibo255000 China

Addressing the energy crisis is pivotal to the advancement of human civilization. In this study, we have developed a highly flexible and efficient wearable piezoelectric nanogenerator (PENGs) employing polyvinylidene fluoride (PVDF) as the matrix and polymethacrylate (PMMA) as the dopant. Comprehensive characterization of the piezoelectric nanogenerator 's piezoelectric performance was conducted across varying conditions. Our findings reveal that a PMMA doping concentration of 2 wt% yields the most favorable outcomes. Specifically, at a bending frequency of 1 Hz and an amplitude of 5 mm, the PENGs exhibits a piezoelectric coefficient (d33) of 15 pC/N, a peak output voltage of 8 V, and an optimal load resistance of 70 MΩ, resulting in a power density of 0.72 μW/cm². Notably, the device sustains an extraordinarily stable and continuous output voltage over a period of 3000 seconds. This research represents a significant contribution to the field of eco-friendly, lead-free wearable piezoelectric nanogenerators, offering valuable insights for future advancements. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

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All-Organic Shell-Core Pvdf/Pmma Composite Fiber Films with Enhanced Piezoelectric Performance for Flexible Sensing and Energy Harvesting

SSRN

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SSRN 2024年

作者： Li, Xiao Yuan, ChongXiao Gao, Guoqi Zhou, Hengqing Zhang, Nannan Yang, Xinyue Liu, Xiaofang Sun, Huajun School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device Integration School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Advanced Ceramics Institute of Zibo New & High-Tech Industrial Development Zone Zibo255000 China

The demand for self-powered sensing technology and energy harvesting system necessitates high-performance and flexible piezoelectric materials. This paper presents a novel approach utilizing coaxial electrospinning to fabricate all-organic PVDF/PMMA piezoelectric fiber films with a shell-core structure. The resulting fiber films, cut into 2 × 2 cm2 square pieces and hot-pressed every three pieces, demonstrate enhanced piezoelectric properties while retaining high flexibility. The interaction between the -C=O bonds in the PMMA polymer and the -CH2 in PVDF promotes the arrangement of F atoms in PVDF, enhancing the content of the piezoelectric active phase. Additionally, the coaxial electrospinning process fosters vertically oriented hydrogen bonds between PVDF and PMMA, augmenting cross-linking and improving mechanical properties. Notably, when the PVDF to PMMA layer volume ratio is 5:1, the piezoelectric coefficient (|d33|) of the composite fiber film exhibits a significant 60% increase from 10 pC/N in neat PVDF to 16 pC/N. This research holds substantial promise for applications in self-powered sensing and energy harvesting piezoelectric materials. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

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All-Organic Shell-Core Pvdf/Pmma Composite Fiber Films with Enhanced Piezoelectric Performance for Flexible Sensing and Energy Harvesting

SSRN

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SSRN 2024年

作者： Gao, Guoqi Zhou, Hengqing Yang, Xinyue Zhang, Nannan Liu, Xiaofang Li, Xiao Yuan, ChongXiao Sun, Huajun School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device Integration School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Advanced Ceramics Institute of Zibo New & High-Tech Industrial Development Zone Zibo255000 China

The demand for self-powered sensing technology and energy harvesting system necessitates high-performance and flexible piezoelectric materials. This paper presents a novel approach utilizing coaxial electrospinning to fabricate all-organic PVDF/PMMA piezoelectric fiber films with a shell-core structure. The resulting fiber films, cut into 2 × 2 cm2 square pieces and hot-pressed every three pieces, demonstrate enhanced piezoelectric properties while retaining high flexibility. The interaction between the -C=O bonds in the PMMA polymer and the -CH2 in PVDF promotes the arrangement of F atoms in PVDF, enhancing the content of the piezoelectric active phase. Additionally, the coaxial electrospinning process fosters vertically oriented hydrogen bonds between PVDF and PMMA, augmenting cross- linking and improving mechanical properties. Notably, when the PVDF to PMMA layer volume ratio is 5:1, the piezoelectric coefficient (|d33|) of the composite fiber film exhibits a significant 60% increase from 10 pC/N in neat PVDF to 16 pC/N. This research holds substantial promise for applications in self-powered sensing and energy harvesting piezoelectric materials. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

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Defect Evolution and Effect on Structure and Electric Properties of A/B Site Sm Doped Batio3 Sintered in Different Atmospheres

SSRN

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SSRN 2022年

作者： Wang, Zhen Hao, Hua Peng, Feng Zhang, Wanying Su, Cong Guo, Qinghu Yao, Zhonghua Cao, Minghe Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Center for Smart Materials and Device Integration

BaTiO3 ceramics doped with different contents of Sm (0.5-7 mol%) are prepared by a homogeneous precipitation method and sintered in air (A-xSm) and reducing (R-xSm) atmosphere respectively. With the increase of doping amount, the phase structure of Sm-doped BaTiO3 ceramics gradually changes from tetragonal phase to cubic phase, and the cubic phase is stronger in R-xSm. In the air atmosphere, Sm ions preferentially replace Ba sites as donors at low doping concentration, which is easy to convert Ti4+ ions into Ti3+ ions, resulting high dielectric constant (>104) and semiconductor like properties. As the doping amount increases, Sm ions start to replace Ti sites as acceptors to generate oxygen vacancies, which capture the electrons generated by donor doping, thus decreasing the percentage of Ti3+ ions. As a result, the dielectric loss and permittivity are decreased, and the electrical insulation properties of A-xSm ceramics are gradually improved. However, in the reducing atmosphere, oxygen atoms in the lattice are easy to escape, resulting in many oxygen vacancies and free electrons. The increase of oxygen vacancy inhibits the substitution of Sm ion to Ti site, and the free electron leads to the increase the percentage of Ti3+ ions and R-xSm ceramics exhibit semiconductor like properties. Thermally stimulated depolarization currents (TSDC) testing verified that oxygen vacancies of A-xSm ceramics mainly capture space charges, and a small part of oxygen vacancies form defective dipoles. The complex impedance test shows that the change of resistivity of A-xSm ceramics is mainly closed to the influence of Sm doping on the grain not grain boundary of BaTiO3 ceramic. © 2022, The Authors. All rights reserved.

关键词： Oxygen vacancies

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Suppression of Bulk Traps in Al2o3 Gate Dielectric and its Effect on Threshold Voltage Instability in Al2o3/Algan/Gan Metal-Oxide-Semiconductor High Electron Mobility Transistors

SSRN

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SSRN 2023年

作者： Deng, Kexin Huang, Sen Wang, Xinhua Jiang, Qimeng Yin, Haibo Fan, Jie Jing, Guanjun Wei, Ke Zheng, Yingkui Shi, Jingyuan Liu, Xinyu High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China

Bulk trapping and its effects on threshold voltage hysteresis (ΔVTH) in Al2O3/AlGaN/GaN metal-oxide-semiconductor high electron mobility transistors (MOS-HEMTs) are researched through isothermal capture transient spectroscopy. A post deposition annealing (PDA) at 500 ℃ in the O2 ambient is confirmed to be an effective way to reduce the bulk traps in the atomic layer deposited (ALD)-Al2O3 film as it contributes to the suppressed ΔVTH in Al2O3/AlGaN/GaN MOS-HEMTs. Isothermal-mode capacitance deep level transient spectroscopy (C-DLTS) is utilized to investigate the threshold voltage instability in Al2O3/AlGaN/GaN MOS-HEMTs. The evolution of the C-DLTS signals verifies the continual charging of oxide bulk traps in the Al2O3 gate dielectric once the gate bias of the MOS-HEMTs is applied exceeding +3 V, which leads to the degraded ΔVTH as well as subthreshold slopes in transfer characterization. Such traps probably stem from the Al-O-H component in as-deposited Al2O3 layers, as detected by X-ray photoelectron spectroscopy (XPS) analysis. Energy band simulation further illustrates the capture process of the oxide bulk traps, verifying the physical relationship between bulk-trapping and ΔVTH. © 2023, The Authors. All rights reserved.

关键词： Gallium nitride

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Direct Cu-polyimide Bonding Achieved by Surface Activation and Pt-catalyzed Formic Acid Atmosphere

Direct Cu-polyimide Bonding Achieved by Surface Activation a...

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2021 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2021

作者： Meng, Ying Gao, Runhua Wang, Xinhua Chen, Xiaojuan Huang, Sen Wei, Ke Wang, Dahai Mu, Fengwen Liu, Xinyu Chinese Academy of Sciences High-Frequency High-Voltage Device and Integrated Circuits RD Center Institute of Microelectronics Beijing100029 China University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China

ISBN: (纸本)9781665417471

Recent flexible printed circuit applications of high-frequency wireless communication systems require thicker metal layers on substrates for lower ohmic losses. In this paper, a Cu layer over 50-micron thick was directly generated on the polyimide substrate by heterogeneous bonding method without interlayer. The polyimide was first sputtered a 200 nm-thick Cu layer, and then was activated by oxygen plasma to improve its hydrophilicity and achieve direct adhesion between polyimide and nanoscale Cu deposition, and eventually was bonded with a 50micron-thick Cu foil in a Pt-catalyzed formic acid atmosphere by thermo-compression. The effectiveness of this method was verified by comparing bonding interfaces, shear strength, and fracture modes of bonded samples with and without a Cr interlayer. This method provides a new idea for the integration of heterogeneous materials needed in wearable products and flexible printed circuits. © 2021 IEEE.

关键词： Formic acid

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A Systematic Characterization Method for Time-resolved Stability and Reliability Issues on Lateral GaN Power devices

A Systematic Characterization Method for Time-resolved Stabi...

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International Symposium on Power Semiconductor devices and Ics (ISPSD)

作者： Yifei Huang Qimeng Jiang Sen Huang Xinyu Liu High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of Microelectronics of the Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics of the Chinese Academy of Sciences Beijing China Institute of Microelectronics University of Chinese Academy of Sciences Beijing China

In this work, three testing modes, including continuous hard switching testing (HSW), high-voltage DC stress testing (DC) and recovery testing (RE), are implemented to characterize time-resolved dynamic $R_{\text{ON}}$ behaviors of GaN HEMT devices, based on the inductive-load evaluation platform. The proposed stressing pattern (DC-HSW-DC-RE) enables the separation of de-stress- and transient-stress-induced dynamic $R_{\text{ON}}$ . Based on the stressing pattern, a novel physical-based characterization method is proposed to identify the irreversible degradation of dynamic $R_{\text{ON}}$ , featuring excellent sensitivity when compared with the traditional methods. In addition, lifetime acceleration experiments are carried out, and the irreversible $R_{\text{ON}}$ degradation exhibits a strong dependence on voltage and current, but a weak dependence on temperature.

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A New Type of MPd5 Kagome Superconductors

arXiv

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arXiv 2025年

作者： Li, Dan Wang, Zhengxuan Jing, Panshi Shiri, Mehrdad Wang, Kun Ma, Chunlan Gong, Shijing Zhao, Chuanxi Wang, Tianxing Dong, Xiao Zhuang, Lin Liu, Wuming An, Yipeng School of Physics Henan Normal University Xinxiang453007 China Henan Key Laboratory of Advanced Semiconductor & Functional Device Integration Henan Normal University Xinxiang453007 China Department of Physics University of Miami Coral GablesFL33146 United States School of Physics and Technology Suzhou University of Science and Technology Suzhou215009 China Department of Physics East China Normal University Shanghai200062 China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou510632 China State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou510275 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China

Kagome materials, which are composed of hexagons tiled with a shared triangle, have inspired enormous interest due to their unique structures and rich physical properties, but exploring superconducting material systems with new kagome structures is still an important research direction. Here, we predict a new type of kagome superconductors, MPd5 (M is a group IIA metal element), and identify that they exhibit coexistence of superconductivity and non-trivial topological properties. We uncover their phonon-mediated superconductivity by the density functional theory for superconductors (SCDFT), predicting the superconducting transition temperatures (Tc) of 2.64, 2.03, and 1.50 K for CaPd5, SrPd5, and BaPd5, respectively, which can be effectively tuned by external pressure and electron doping. The present results also demonstrate that MPd5 have various topological properties such as, CaPd5 shows topological non-trivial intersection near the Fermi level (EF). Our results indicate that the MPd5 materials can be an emerging material platform with rich exotic physics in their kagome structures, and render themselves excellent candidates for superconducting and advanced functional materials that could be utilized in topological quantum computing and information technology. © 2025, CC BY.

关键词： Quantum computers

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