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Observation of multiple surface states in naturally cleavable chiral crystal PdSbSe

Physical Review Materials 2025年第3期9卷 L031201-L031201页

作者： Zhicheng Jiang Zhengtai Liu Chenqiang Hua Xiangqi Liu Yichen Yang Jianyang Ding Jiayu Liu Jishan Liu Mao Ye Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology University of Science and Technology of China Hefei 230026 China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou 310027 China State Key Lab of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Beihang Hangzhou Innovation Institute Yuhang Xixi Octagon City Yuhang District Hangzhou 310023 China School of Physical Science and Technology ShanghaiTech University Shanghai 200031 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Chiral multifold fermions in solids exhibit unique band structures and topological properties, making them ideal for exploring fundamental physical phenomena related to nontrivial topology, chirality, and symmetry breaking. However, the challenge of obtaining clean, flat surfaces through cleavage has hindered the investigation of their unique electronic states. In this study, we utilize high-resolution angle-resolved photoemission spectroscopy and density functional theory calculations to investigate the low-energy electronic structure of the cleavable single-crystal PdSbSe. Our combined experimental and theoretical analysis reveals the presence of multifold-degenerate fermions within this chiral crystal. We also observe multiple chiral Fermi arc surface states and spin-splitting behavior in the associated bulk bands. These findings provide unique insights into chiral, multifold fermionic states in easily cleavable crystals and offer a robust platform for further research into their unique electronic properties and potential applications in novel electronic devices.

关键词： Photoelectron spectroscopy

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Efficient flexible perovskite solar cells:From materials to buried structure revealed by synchrotron radiation GIWAXS

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Journal of Energy Chemistry 2025年第5期104卷 254-267页

作者： Xiaoxi Li Tingting Wang Lifeng Yang Bitao Dong Yuchun Li Laixi Li Lina Li Shanglei Feng Gengsheng Chen Yingguo Yang School of Microelectronics Fudan UniversityShanghai 200433China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research InstituteShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Department of Physics Shaoxing UniversityShaoxing 312000ZhejiangChina Shanghai Shangchao Technology Co. Ltd.Shanghai 201800China Shanghai Institute of Quality Inspection and Technical Research Shanghai 201114China Department of Materials Sciences and Engering Division of Solid State PhysicsAgstrom LaboratoryUppsala UniversityUppsala SE-75105Sweden State Key Laboratory of Photovoltaic Science and Technology Fudan UniversityShanghai 200433China

Perovskite solar cells(PSC)are considered as a promising photovoltaic technology due to their low cost and high efficiency exceeding 26.8%.Ultra-lightweight flexible perovskite solar cells(FPSCs)can be applied to many fields such as architecture and portable *** the photovoltaic conversion efficiency(PCE)of FPSC has exceeded 24%in the past few years,further application of FPSC is constrained by the challenges posed by limitation of critical material ***,we discussed recent research progress of key FPSC materials,mechanical endurance,low-temperature fabrication,*** the advantages of high brightness,collimation and resolution,we specially introduced the application of synchrotron radiation grazing incidence wide-angle X-ray scattering(GIWAXS)to directly observe the perovskite buried interface structure and corresponding mechanical stability of FPSCs without any ***,we summarize the challenges and propose an outlook about the large-scale preparation of efficient and stable FPSC modules.

关键词： Flexible perovskite solar cells Device materials Buried structure Synchrotron radiation GIWAXS

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Ce3+-doped glass scintillator with high density and light yield for imaging application

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Ceramics International 2025年第15期51卷 19780-19786页

作者： Yang, Dong Ge, Kun Ban, Huiyun Yuan, Huiping Qian, Sen Hua, Zhehao Cai, Hua Chen, Danping Han, Jifeng Qiao, Xvsheng Ren, Jing Sun, Xinyuan Tang, Gao Yin, Shenghua Zhang, Minghui Xiao, Jiawen Beijing Glass Research Institute Beijing101111 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Particle Detection and Electronics Beijing100049 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China China Building Materials Academy Beijing100024 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Lab of Radiation Physics and Technology of MOE Sichuan University Chengdu610065 China Key Laboratory of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341003 China State Key Laboratory of Silicon and Advanced Semiconductor Materials & Department of Materials Science and Engineering Zhejiang University Hangzhou310027 China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Department of Physics and Key Laboratory of Jiangxi Province for Special Optoelectronic Artificial Crystal Materials Jinggangshan University Ji'an343009 China College of Materials and Chemistry China Jiliang University Hangzhou310018 China Nuclear Instrument CO. LTD. Beĳing100176 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai201899 China College of Materials Science and Engineering Beijing University of Technology Beijing100124 China

A series of Ce3+-doped Gd2O3-GdF3-Al2O3-B2O3-SiO2 glass scintillators (GSCx and GLCx) were successfully synthesized in reducing atmosphere for future imaging application. The transmittance of GSCx glasses exceeds 85 % in range of 500–800 nm, and the cut-off edge red shifts as the Ce3+ concentration increases. In photoluminescence (PL), GSCx glass scintillators have a 360–600 nm broadband emission with a shoulder peak at around 450 nm. Meanwhile, the PL lifetime of GSCx glasses is close to the CeF3 crystals, and the PL QY of GSC3 glass scintillator reaches up 70.2 %. For scintillation application, the integral XEL intensity of GSC2 and GSC3 glasses is 31.3 % and 24.4 % of that of BGO crystal. GLC2 and GLC3 glasses exhibit similar spatial resolution of approximately 7 lp·mm−1. Moreover, the light yields of GSC2 and GSC3 glass scintillator are 1702 and 1690 ph/MeV excited by γ-ray, respectively. The nonproportionality of GSCx glasses is less than 3 % in the range of 100–1400 keV due to the large density and Zeff. As Ce3+ concentration increases, both the fast and slow components of the glasses decrease (103.7 ns–89.7 ns, 1454.4 ns–1012.8 ns), and the proportion of fast component also increased from 3.3 % to 4.7 %. For γ-ray imaging, the scintillation light events of the glass can be observed from SiPM array, and the central position (−2, −1) have the highest count rate of the system. The results show that GSCx and GLCx glass scintillators deserve further development for future applications. © 2025

关键词： Gamma rays

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Recent progress on surface chemistryⅡ:Property and characterization

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Chinese Chemical Letters 2025年第1期36卷 8-57页

作者： Xin Li Zhen Xu Donglei Bu Jinming Cai Huamei Chen Qi Chen Ting Chen Fang Cheng Lifeng Chi Wenjie Dong Zhenchao Dong Shixuan Du Qitang Fan Xing Fan Qiang Fu Song Gao Jing Guo Weijun Guo Yang He Shimin Hou Ying Jiang Huihui Kong Baojun Li Dengyuan Li Jie Li Qing Li Ruoning Li Shuying Li Yuxuan Lin Mengxi Liu Peinian Liu Yanyan Liu Jingtao Lü Chuanxu Ma Haoyang Pan JinLiang Pan Minghu Pan Xiaohui Qiu Ziyong Shen Qiang Sun Shijing Tan Bing Wang Dong Wang Li Wang Lili Wang Tao Wang Xiang Wang Xingyue Wang Xueyan Wang Yansong Wang Yu Wang Kai Wu Wei Xu Na Xue Linghao Yan Fan Yang Zhiyong Yang Chi Zhang Xue Zhang Yang Zhang Yao Zhang Xiong Zhou Junfa Zhu Yajie Zhang Feixue Gao Yongfeng Wang Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China Spin-X Institute School of MicroelectronicsSouth China University of TechnologyGuangzhou 511442China School of Materials and Energy Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage DevicesGuangdong University of TechnologyGuangzhou 510006China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China i-Lab CAS Key Laboratory of Nanophotonic Materials and DevicesSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Physics&University of Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School

Surface with well-defined components and structures possesses unique electronic,magnetic,optical and chemical *** a result,surface chemistry research plays a crucial role in various fields such as catalysis,energy,materials,quantum,and *** science mainly investigates the correspondence between surface property and *** probe microscopy(SPM)techniques are important tools to characterize surface properties because of the capability of atomic-scale imaging,spectroscopy and manipulation at the single-atom *** this review,we summarize recent advances in surface electronic,magnetic and optical properties characterized mainly by SPM-based *** focus on elucidating theπ-magnetism in graphene-based nanostructures,construction of spin qubits on surfaces,topology properties of surface organic structures,STM-based light emission,tip-enhanced Raman spectroscopy and integration of machine learning in SPM studies.

关键词： Surface chemistry Scanning probe microscopy π-Magnetism Spin qubits Tip-enhanced Raman spectroscopy

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Catalytic remodeling of complex alkenes to oxonitriles through C=C double bond deconstruction

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Science (New York, N.Y.) 2025年第6738期387卷 1083-1090页

作者： Cheng, Zengrui Huang, Kaimeng Wang, Chen Chen, Lili Li, Xinyao Hu, Zhibin Shan, Xinyuan Cao, Peng-Fei Sun, Haofeng Chen, Wei Li, Chenhao Zhang, Ziyao Tan, Hui Jiang, Xue Zhang, Guikai Zhang, Zhongying Lin, Min Wang, Liang Zheng, Anmin Xia, Changjiu Wang, Teng Song, Song Shu, Xingtian Jiao, Ning State Key Laboratory of Natural and Biomimetic Drugs Chemical Biology Center School of Pharmaceutical Sciences Peking University Beijing China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum Processing SINOPEC Beijing China Department of Chemistry College of Sciences Shanghai Engineering Research Center of Organ Repair Shanghai University Shanghai China College of Chemistry State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing China Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan China Beijing Synchrotron Radiation Facility Institute of High Energy Physics University of Chinese Academy of Sciences Beijing China Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou China Interdisciplinary Institute of NMR and Molecular Sciences School of Chemistry and Chemical Engineering Wuhan University of Science and Technology Wuhan China Changping Laboratory Beijing China

Deconstructive transformation of carbon-carbon double bonds (C=C) is a pivotal strategy in synthetic chemistry and drug discovery. Despite the substantial advances in olefin metathesis and ozonolysis for natural product synthesis through C=C double-bond cleavage, the catalytic remodeling of complex molecules through C=C double-bond deconstruction has been underdeveloped. We report a heterogeneous copper-catalyzed C=C double-bond cleavage, which enables the remodeling of complex molecules by converting the carbons on either side of the C=C double bond to carbonyl and cyano groups, respectively. In particular, this method provides an efficient protocol to conveniently transform terpenoids, glycals, steroids, and bioactive molecules to privileged scaffolds with underexplored chemical space.

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Revealing the Electron-Spin Fluctuation Coupling by Photoemission in CaKFe4As4

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Physical Review X 2025年第2期15卷 021001-021001页

作者： Peng Li Yuzhe Wang Yabin Liu Jianghao Yao Zhisheng Zhao Zhengtai Liu Dawei Shen Huiqian Luo Guanghan Cao School of Emerging Technology University of Science and Technology of China Hefei 230026 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology and New Cornerstone Science Laboratory University of Science and Technology of China Hefei 230026 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics and State Key Lab of Silicon Materials Zhejiang University Hangzhou 310027 China

Electron-boson coupling in unconventional superconductors is one of the key parameters in understanding the superconducting pairing symmetry. Here, we report definitive photoemission evidence of electron-spin fluctuation coupling in the iron-based superconductor CaKFe4As4, obtained via high-resolution ARPES. Our study identifies a distinct kink structure on the α band, observable only in the superconducting phase and closely linked with the superconductivity, indicative of strong electron-boson interactions. Notably, this kink structure corresponds to two distinct bosonic modes at 11 meV and 13 meV, aligning with spin resonance modes previously observed in inelastic neutron-scattering experiments. This alignment underscores the significant role of antiferromagnetic fluctuations in the pairing mechanism of this superconductor. Furthermore, the unique momentum-dependent and orbital-selective properties of the coupling revealed by ARPES provide profound insights into the pairing symmetry, suggesting predominantly s±-wave pairing facilitated by spin fluctuations. Our findings not only highlight the pivotal role of spin resonance in the superconductivity of CaKFe4As4 but also enhance our understanding of the electron-spin fluctuation interactions in unconventional superconductors.

关键词： Spin fluctuations

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The impact of codoping on the near-infrared scintillation emissions of Er3+-doped gadolinium tellurite glass

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Ceramics International 2025年

作者： Sui, Zexuan Liu, Chuang Zheng, Xiaoxin Han, Jifeng Qian, Sen Song, Yushou Sun, Xinyuan Wang, Bing Zhao, Yiran Ren, Jing Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin150001 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu610065 China College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Department of Physics Jinggangshan University Ji'an343009 China Zolix Instruments Co. Ltd Beijing101102 China

The near-infrared (NIR) glass scintillators have garnered increasing attention in the field of long-distance non-contact radiation detections due to their unique advantages, including immunity to radiation damages and compatibility with optical fiber systems. Nevertheless, the studies on the NIR scintillation mechanisms of such glasses are scarce, especially concerning the impact of rare earth ion co-doping on the scintillation properties. Here, the physical properties, optical characteristics, and scintillation performance were investigated of a series of TeO2-BaO-GdF3 gadolinium tellurite glasses co-doped with Er3+/Yb3+. It is noted that the well-established strategy for NIR photoluminescence enhancement via energy transfer sensitization was not applied to radioluminescence (under the X-rays excitation). The possible mechanism for such an important distinction was discussed. This study is expected to provide the theoretical guidance for enhancing or avoiding quenching of scintillation performance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Scintillation counters

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Revealing the electron-spin fluctuation coupling by photoemission in CaKFe4As4

arXiv

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arXiv 2025年

作者： Li, Peng Wang, Yuzhe Liu, Yabin Yao, Jianghao Zhao, Zhisheng Liu, Zhengtai Shen, Dawei Luo, Huiqian Cao, Guanghan Jiang, Juan Feng, Donglai School of Emerging Technology University of Science and Technology of China Hefei230026 China Shenzhen518045 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Department of Physics State Key Lab of Silicon Materials Zhejiang University Hangzhou310027 China Chinese Academy of Sciences Shanghai200050 China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology New Cornerstone Science Laboratory University of Science and Technology of China Hefei230026 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China

Electron-boson coupling in unconventional superconductors is one of the key parameters in understanding the superconducting pairing symmetry. Here, we report definitive photoemission evidence of electron-spin exciton coupling in the iron-based superconductor CaKFe4As4, obtained via high-resolution ARPES. Our study identifies a distinct kink structure on the α band, observable only in the superconducting phase and closely linked with the superconductivity, indicative of strong electron-boson interactions. Notably, this kink structure corresponds to two distinct bosonic modes at 11 meV and 13 meV, aligning with spin resonance modes previously observed in inelastic neutron scattering experiments. This alignment underscores the significant role of antiferromagnetic fluctuations in the pairing mechanism of this superconductor. Furthermore, the unique momentum-dependent and orbital-selective properties of the coupling revealed by ARPES provide profound insights into the pairing symmetry, suggesting predominantly s± wave pairing facilitated by spin fluctuations. Our findings not only highlight the pivotal role of spin resonance in the superconductivity of CaKFe4As4 but also enhance understanding of the electron-spin exciton interactions in unconventional superconductors. © 2025, CC BY.

关键词： Iron-based Superconductors

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Chemical Bonding States of TiC Films before and after Hydrogen Ion Irradiation

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Journal of Wuhan University of technology(Materials Science) 2007年第4期22卷 630-633页

作者：任丁黄宁康 Key Lab for Radiation Physics and Technology of Education Ministry of China Institute of Nuclear Science and TechnologySichuan University Key Lab for Radiation Physics and Technology of Education Ministry of China Institute of-Nuclear Science and TechnologySichuan University

TiC films deposited by rf magnetron sputtering followed by Ar＋ ion bombardment were irradiated with a hydrogen ion beam. X-ray photoelectron spectroscopy （XPS） was used for characterization of the chemical bonding states of C and Ti elements of the TiC films before and after hydrogen ion irradiation, in order to understand the effect of hydrogen ion irradiation on the films and to study the mechanism of hydrogen resistance of TiC films. Conclusions can be drawn that ion bombardment at moderate energy can cause preferential physical sputtering of carbon atoms from the surface of low atomic number （Z） material. This means that ion beam bombardment leads to the formation of a non-stoichiometric composition of TiC on the surface. TiC films prepared by ion beam mixing have the more excellent characteristic of hydrogen resistance. One important cause, in addition tO TiC itself, is that there are many vacant sites in TiC created by ion beam mixing. These defects can easily trap hydrogen and effectively enhance the effect of hydrogen resistance.

关键词： TiC films XPS chemical bonding

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Natural Alkaloids (Caffeine, Theobromine and Theophylline) as Dielectric Capping Layers for Gold and Aluminum Gate Electrodes in Low Operating Voltage Organic Field-Effect Transistors

IEEE Journal on Flexible Electronics

引用

IEEE Journal on Flexible Electronics 2025年

作者： Irimia, Cristian Vlad Yumusak, Cigdem Ban, Boyuan Leeb, Elisabeth Mayr, Felix Schimanofsky, Corina Mardare, Andrei Ionut Molnar, Maximilian Alexander Teichert, Christian Sariciftci, Niyazi Serdar Irimia-Vladu, Mihai Institute of Physical Chemistry Altenberger Str. 69 Linz4040 Austria Graz University of Technology in Graz Master of Science student in Advanced Materials Science program Austria Montanuniversität Leoben Chair of Physics Department of Physics Mechanics and Electrical Engineering Franz Josef Str. 18 Leoben8700 Austria Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid-State Physics Hefei Institute of Physical Science Hefei230031 China Altenberger Str. 69 Linz4040 Austria National Institute for Lasers Plasma and Radiation Physics Magurele077125 Romania

Three natural alkaloids: caffeine, theobromine and theophylline are reported for their application as dielectric layers in organic field effect transistors (OFETs) utilizing both gold and aluminum gate electrodes. After careful purification of the materials, a detailed analysis using x-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), contact angle (CA), impedance spectroscopy, amplitude modulated kelvin probe force microscope (AM-KPFM) and cyclic voltammetry (CV) is performed. OFET devices operating at typical voltages between 2 and 4 V have been fabricated with the investigated alkaloid films processed via blade coating (caffeine) or vacuum processing (theobromine and theophylline). The dielectric properties of these three alkaloids are measured in impedance spectroscopy and negligible leakage currents are observed when deposited in thin films as dielectric layers in OFETs on aluminum electrodes. There is a high tendency of these molecules to crystallize and form uneven surfaces. When the thin film forming properties are carefully controlled, organic alkaloids can be employed in applications involving implantable, transient or even edible electronics. © 2022 IEEE.

关键词： Fourier transform infrared spectroscopy

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