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Superconductivity in kagome metal ThRu3Si2

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Chinese Physics B 2024年第5期33卷 50-55页

作者：刘艺厉静杨武璋卢佳依曹博雅李华旬柴万力武思祺李佰卓孙云蕾焦文鹤王操许晓峰任之曹光旱 School of Physics Zhejiang University department of Applied Physics Zhejiang University of Technology School of science Westlake Institute for Advanced Study Westlake University department of Physics Shandong University of Technology School of Information and Electrical engineering Zhejiang University City College Interdisciplinary Center for Quantum Information and State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University Collaborative Innovation Centre of Advanced microstructures Nanjing University

We report the physical properties of ThRu3Si2featured with distorted Ru kagome lattice. The combined experiments of resistivity, magnetization and specific heat reveal bulk superconductivity with Tc= 3.8 K. The specific heat jump and calculated electron–phonon coupling indicate a moderate coupled BCS superconductor. In comparison with LaRu3Si2,the calculated electronic structure in ThRu3Si2shows an electron-doping effect with electron filling lifted from 100 meV below flat bands to 300 meV above it. This explains the lower superconducting transition temperature and weaker electron correlations observed in ThRu3Si2. Our work suggests the Tc and electronic correlations in the kagome superconductor could have an intimate connection with the flat bands.

关键词： superconductivity kagome lattice flat band

Room-temperature ferromagnetism and piezoelectricity in metalfree 2D semiconductor crystalline carbon nitride

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Nano Research 2024年第6期17卷 5670-5679页

作者： Yong Wang Dingyi Yang Wei Xu Yongjie Xu Yu Zhang Zixuan Cheng Yizhang Wu Xuetao Gan Wei Zhong Yan Liu Genquan Han Yue Hao Wide Bandgap Semiconductor Technology Disciplines state Key laboratory School of MicroelectronicsAcademy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710071China Emerging Device and Chip laboratory Hangzhou Institute of TechnologyXidian UniversityHangzhou 311200China INRS Centre for Energy Materials and Telecommunications1650 Boul.Lionel BouletVarennesQC J3X 1P7Canada national laboratory of solid state microstructures Collaborative Innovation Center of Advanced Microstructures and Jiangsu Provincial Key Laboratory for NanotechnologyNanjing UniversityNanjing 210093China School of Education Jiangsu Open UniversityNanjing 210036China department of Physics Shaanxi University of Science and TechnologyXi’an 710021China department of Applied Physical sciences The University of North Carolina at Chapel HillChapel HillNC 27514USA Key laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi'an 710129 China

Two-dimensional(2D)materials that combine ferromagnetic,semiconductor,and piezoelectric properties hold significant potential for both fundamental research and spin electronic ***,the majority of reported 2D ferromagnetic-semiconductor-piezoelectric materials rely on d-electron systems,which limits their practical applications due to a Curie temperature lower than room temperature(RT).Here,we report a high-crystallinity carbon nitride(CCN)material based on sp-electrons using a chemical vapor deposition *** exhibits a band gap of 1.8 eV and has been confirmed to possess substantial in-plane and out-of-plane ***,we acquired clear evidences of ferromagnetic behavior at room *** structural characterizations combined with theoretical calculations reveal that incorporating structural oxygen into the highly ordered heptazine structure causes partial substitution of nitrogen sites,which is primarily responsible for generating room-temperature ferromagnetism and *** a result,the strain in wrinkles can effectively modulate the domain behavior and piezoelectric potential at room *** addition of RT ferromagnetic-semiconductor-piezoelectric material based on sp-electrons to the family of two-dimensional materials opens up numerous possibilities for novel applications in fundamental research and spin electronic devices.

关键词： crystallinity carbon nitride room-temperature ferromagnetism piezoelectricity magnetic force microscopy density functional theory(DFT)calculations

Self‐assembled monolayers for perovskite solar cells

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Information ＆ Functional materials 2024年第1期1卷 2-25页

作者： Dongdong Xu Pu Wu Hairen Tan national laboratory of solid state microstructures College of Engineering and Applied SciencesFrontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjingChina

In metal‐halide perovskite solar cells(PSCs),various carrier recombination losses occur at the interface between metal oxides(MOs)and perovskite(PVK)due to the imperfect lattice structure of the crystal ***,the nonoptimal energy levels of MOs and PVK,as well as ion diffusion and chemical corrosion between the two materials,severely hinder carrier transport at the ***,there is an urgent need to introduce multifunctional materials between MOs and PVK to mitigate interface defects,carrier transport limitations,chemical corrosion,and other related *** recent years,self‐assembled monolayers(SAMs)have emerged as essential organic interfacial materials for effectively bridging MOs and PVK,playing a pivotal role in enhancing cells’*** on this,we provide a detailed overview of the origin and development of SAMs in PSCs and summarize the importance and potential of SAMs from various aspects,including their chemical structure,interface passivation,energy level tuning,and interface *** finally discuss the prospects of SAMs in terms of molecular structure,deposition methods,and their application in narrow‐band gap *** these insights,it is anticipated that SAMs will assist in realizing larger,highly efficient,stable,and cost‐effective PSCs,thereby enhancing the competitiveness of PSCs in the solar photovoltaics market.

关键词： metal oxides perovskite solar cells self‐assembled monolayers

New paradigms of water-enabled electrical energy generation

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SusMat 2024年第3期4卷 73-103页

作者： Zhengtong Li Tao Yang Jia-Han Zhang Taotao Meng Saad Melhi Jungmok You Miharu Eguchi Likun Pan Yusuke Yamauchi Xingtao Xu The national Key laboratory ofWater Disaster Prevention Yangtze Institute for Conservation and DevelopmentState Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringHohai UniversityNanjingChina School of Electronic Information engineering Inner Mongolia UniversityHohhotChina Collaborative Innovation Center of Advanced microstructures School of Electronic Science and EngineeringNanjing UniversityNanjingChina College of materials science and engineering Nanjing Forestry UniversityNanjingChina department of Chemistry College of ScienceUniversity of BishaBishaSaudi Arabia department of Plant&Environmental New Resources College of Life SciencesKyung Hee UniversityYongin-siGyeonggi-doSouth Korea department of Applied Chemistry School of Advanced Science and EngineeringWaseda UniversityShinjuku-kuTokyoJapan Shanghai Key laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghaiChina School of Chemical engineering and Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandBrisbaneQueenslandAustralia department of materials Process engineering Graduate School of EngineeringNagoya UniversityNagoyaJapan Marine science and Technology College Zhejiang Ocean UniversityZhoushanZhejiangChina

Nanotechnology-inspired small-sized water-enabled electricity generation(WEG)has sparked widespread research interest,especially when applied as an electricity source for off-grid low-power electronic equipment and ***,WEG encompasses a wide range of physical phenomena,generator structures,and power generation ***,a systematic framework to clearly describe the connections and differences between these technologies is *** this review,a comprehensive overview of generator technologies and the typical mechanisms for harvesting water energy is *** the different roles of water inWEG processes,the related technologies are presented as two different ***,a detailed analysis of the electrical potential formation in each WEG process is presented,and their similarities and differences are ***,a comprehensive compilation of advanced generator architectures and system designs based on hydrological cycle processes is presented,along with their respective energy *** nanotechnology-inspired small-sized WEG devices show considerable potential for applications in the Internet of Things ecosystem(i.e.,microelectronic devices,integrated circuits,and smart clothing).Finally,the prospects and future challenges of WEG devices are also summarized.

关键词： electricity generation mechanisms Internet of Things multi-angle generator systems smallsized generators water-enabled electricity generation

Cost-efficient quantum access network boosts practical deployment of quantum key distribution network

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science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 169-169页

作者： Hua-Lei Yin Zeng-Bing Chen department of Physics and Beijing Key laboratory of Opto-electronic Functional materials and Micro-nano Devices Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education)Renmin University of ChinaBeijing 100872China national laboratory of solid state microstructures and School of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The security of information is not assured over extended periods,especially with the rapid advancement of quantum *** address this challenge,quantum cryptography,rooted in quantum physics,offers comprehensive toolkits for key distribution[1],secret sharing[2],digital signatures[3]and other cryptographic tasks[4]with information-theoretical *** feasibility of quantum cryptography,particularly quantum key distribution(QKD)。

关键词： quantum distribution signature

DMF-scMT-seq linking methylome and transcriptome within single cells with digital microfluidics

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science China Chemistry 2024年第6期67卷 2070-2078页

作者： Xing Xu Xi Zeng Xin Lin Shiyan Lin Shanshan Liang Tian Tian Rui Su Jia Song Chaoyong Yang Collaborative Innovation Center of Chemistry for Energy materials The MOE Key Laboratory of Spectrochemical Analysis and InstrumentationState Key Laboratory of Physical Chemistry of Solid SurfacesDepartment of Chemical BiologyCollege of Chemistry and Chemical EngineeringThe First Affiliated Hospital of Xiamen UniversityXiamen UniversityXiamen361005China Institute of Molecular Medicine Renji HospitalShanghai Jiao Tong University School of MedicineShanghai200127China Chemistry and materials science College Shanghai Normal UniversityShanghai200234China Chemistry and Biomedicine Innovation Center(ChemBIC) School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China

Single-cell joint analysis of methylome and transcriptome reveals how the methylation regulates the transcriptional ***,traditional bench-top protocols for single-cell DNA methylation and RNA transcription co-detection are laborintensive,cost-ineffective and ***,we establish the DMF-sc MT-seq,a highly-efficient and cost-effective method to simultaneously analyze single-cell DNA methylation and transcriptional activity based on digital *** MT-seq automates the workflow of single-cell isolation,cellular hypotonic lysis,nucleic acid separation and methylome/transcriptome library construction in a contactless and addressable *** system ensures high accuracy(R>0.85),high gene detection ability(14,697 genes per cell at 4 million sequencing depth),and high CpG coverage(677,198 CpG sites per cell at 1million sequencing depth).By using DMF-sc MT-seq,the relationship of DNA methylation and RNA transcription under different genomic contexts is *** further apply DMF-sc MT-seq to study the dynamics of transcription regulation with methylation-inhibiting anti-tumor Decitabine,and identify the methylated promoter/gene body driven genes in response to Decitabine ***-sc MT-seq facilitates the construction of the correlation of DNA methylation and transcriptional activity at the single-cell level in a flexible,sensitive and accurate way,which is anticipated to be a powerful tool in studying single-cell biological systems.

关键词： single-cell analysis digital microfluidics methylome sequencing transcriptome sequencing

Non-Hermitian polarization quantized by time-reversal symmetry

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science China(Physics,Mechanics & Astronomy) 2024年

作者： Jing Cheng Jinbing Hu Zhigao Hu Lin Chen Minghui Lu Songlin Zhuang Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai) Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education)Department of Physics and Electronic Science East of China Normal University College of Optical-Electrical Information and Computer engineering University of Shanghai for Science and Technology Wuhan national laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology national laboratory of solid state microstructures science and engineering Nanjing University

It is well known that in one-dimensional(1D) crystalline insulators, the electric polarization is a manifestation of Berry phase,which can not be quantized by time-reversal symmetry(TRS) as in Hermitian physics TRS does not induce any topological phase in one dimension. In this paper we report that even though associated with complex eigenenergies a 1D non-Hermitian insulator obeying only TRS is capable of presenting quantized bulk polarization. The underlying physical reason is unveiled: TRS guarantees the complex energies to come in pair(E, E*), and the corresponding decaying and amplifying wave functions also come in pair and have the same variation rate, hence, giving rise to a stable wannier center. The electron transport is performed by means of charge pumping process, which verifies the physical mechanism above. At last, we discuss the possible experimental implementation of the proposed model by means of twisted-π gauge flux.

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降低全聚合物太阳能电池光伏效率的温度依赖性

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science China materials 2024年第1期67卷 47-57页

作者：张伟超杨镕申乐耀昌程倩张莹玉张建齐肖林格李世麟姚果张春峰周惠琼张渊 School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Key laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China national laboratory of solid-state microstructures School of Physics and Collaborative Innovation Center for Advanced MicrostructuresNanjing UniversityNanjing 210008China

全聚合物太阳能电池(All-PSCs)具有良好的机械稳定性和热稳定性,受到人们的广泛关注.目前,提高全聚合物太阳能电池性能的关键是改善活性层的形貌.本文通过逐层(LBL)工艺,优化了薄膜形貌,实现了更好的电荷产生和传输,增加了激子扩散长度... 详细信息

全聚合物太阳能电池(All-PSCs)具有良好的机械稳定性和热稳定性,受到人们的广泛关注.目前,提高全聚合物太阳能电池性能的关键是改善活性层的形貌.本文通过逐层(LBL)工艺,优化了薄膜形貌,实现了更好的电荷产生和传输,增加了激子扩散长度,提高了电荷产量,并抑制了复合损失.此外,本文进一步研究了LBL制备的全聚合物太阳能电池中的激子/电荷行为与温度的依赖性关系.详细的原位光谱测量和光电特性表征表明,独特的形态延长了激子寿命,减少了电荷陷阱,并促进了电荷传输和收集.因此,准双层PM6/PYF-T-o器件的能量转换效率(PCE)显著提高(16.70%).此外,与BHJ器件相比,通过LBL工艺制备的器件,实现了增强的分子有序性,降低了能级混乱度,使得器件填充系数和PCE温度依赖性减弱.本工作为太阳能电池在温度可变环境下的电荷传输行为和光伏性能提供了新的认识,也为其实际应用提供了理论依据.

关键词：能量转换效率太阳能电池温度依赖性电荷传输机械稳定性填充系数活性层 LBL

Effect of dry-wet cycles on dynamic properties and microstructures of sandstone:Experiments and modelling

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International Journal of Mining science and Technology 2024年第5期34卷 655-679页

作者： Hai Pu Qingyu Yi Andrey P.Jivkov Zhengfu Bian Weiqiang Chen Jiangyu Wu state Key laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Earth engineering China University of Mining and TechnologyXuzhou 221116China Key laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China department of solids and Structures School of EngineeringUniversity of ManchesterManchester M139PLUK School of Environment science and Spatial Informatics China University of Mining and TechnologyXuzhou 221116China department of Civil and Environmental engineering Rice UniversityHouston 77005USA state Key laboratory of High Performance Civil engineering materials Jiangsu Research Institute of Building Science Co.Ltd.Nanjing 210008China department of materials University of OxfordOxford OX13PHUK

Underground pumped storage power plant(UPSP)is an innovative concept for space recycling of abandoned *** realization requires better understanding of the dynamic performance and durability of reservoir *** paper conducted ultrasonic detection,split Hopkinson pressure bar(SHPB)impact,mercury intrusion porosimetry(MIP),and backscatter electron observation(BSE)tests to investigate the dynamical behaviour and microstructure of sandstone with cyclical dry-wet damage.A coupling FEM-DEM model was constructed for reappearing mesoscopic structure *** results show that dry-wet cycles decrease the dynamic compressive strength(DCS)with a maximum reduction of 39.40%,the elastic limit strength is reduced from 41.75 to 25.62 *** sieved fragments obtain the highest crack growth rate during the 23rd dry-wet cycle with a predictable life of 25 cycles for each rock *** pore fractal features of the macropores and micro-meso pores show great differences between the early and late cycles,which verifies the computational statistics analysis of particle *** numerical results show that the failure patterns are governed by the strain in pre-peak stage and the shear cracks are *** dry-wet cycles reduce the energy transfer efficiency and lead to the discretization of force chain and crack fields.

关键词： Underground pumped storage power plant Dry-wet cycles Split Hopkinson pressure bar Macro and micro properties FEM-DEM coupling model Damage characterization