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Proposal for valleytronic materials:Ferrovalley metal and valley gapless semiconductor

Frontiers of physics 2024年第2期19卷 131-139页

作者： San-Dong Guo yu-Ling Tao Guangzhao Wang Shaobo Chen Dong Huang y.e sin ang School of electronic engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China Key Laboratory of extraordinary Bond engineering and Advanced Materials Technology of Chongqing School of Electronic Information EngineeringYangtze Normal UniversityChongqing 408100China College of electronic and Information engineering Anshun UniversityAnshun 561000China Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)8 Somapah RoadSingapore 487372Singapore

Valleytronic materials can provide new degrees of freedom to future electronic *** this work,the concepts of the ferrovalley metal(FVM)and valley gapless semiconductor(VGS)are proposed,which can be achieved in valleytronic bilayer systems by.electric field *** valleytronic bilayer systems,the interaction between out-of-plane ferroelectricity and A-ty.e antiferromagnetism can induce layer-polarized anomalous valley Hall(LP-AVH)*** K and−K valleys of FVM are both metallic,and electron and hole carriers simultaneously *** the extreme case,the FVM can become VGS by analogizing spin gapless semiconductor(SGS).Moreover,it is proposed that the valley splitting enhancement and valley polarization reversal can be achieved by.electric field engineering in valleytronic bilayer *** the bilayer RuBr_(2)as an example,our proposal is confirmed by the first-principle *** FVM and VGS can be achieved in bilayer RuBr_(2)by applying electric *** appropriate electric field range,increasing electric field can enhance valley splitting,and the valley polarization can be reversed by flipping electric field *** effectively tune valley properties by.electric field in bilayer systems,the parent monolayer should possess out-of-plane magnetization,and have large valley *** results shed light on the possible role of electric field in tuning valleytronic bilayer systems,and provide a way to design the ferrovalley-related material by.electric field.

关键词： valleytronics electric field bilayer

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经典电路网络中奇异束缚态的实验观察

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Science Bulletin 2024年第14期69卷 2194-2204页

作者：邹德源陈天孟海瑜 y.e sin ang 张向东李庆华 Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Department of Physics National University of SingaporeSingapore 117542Singapore Science Mathematics and Technology ClusterSingapore University of Technology and DesignSingapore 487372Singapore Joint School of National University of singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China

exceptional bound(eB)states represent a unique new class of robust bound states protected by the defectiveness of non-Hermitian exceptional *** distinct from the more well-known topological states and non-Hermitian skin states,they were recently discovered as a novel source of negative entanglement entropy in the quantum entanglement ***,eB states have been physically.elusive,being originally interpreted as negative probability.eigenstates of the propagator of nonHermitian Fermi *** this work,we show that eB states are in fact far more ubiquitous,also arising robustly in broad classes of systems whether classical or *** hinges crucially on a newlydiscovered spectral flow that rigorously justifies the eB nature of small candidate lattice *** a highlight,we present their first experimental realization through an electrical circuit,where they manifest as prominent stable resonant voltage *** work brings a hitherto elusive but fundamentally distinctive quantum phenomenon into the realm of classical metamaterials,and provides a novel pathway for the engineering of robust modes in otherwise sensitive systems..

关键词： exceptional bound states Classical circuit network Non-Hermitian Robustness exceptional point

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Quantitative discrimination of surface adsorbed NO_(x) species on CeO_(2) via spectrophotometry for SCR denitration investigation

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Journal of Rare earths 2024年第6期42卷 1066-1072,I0003页

作者： Songil sin Jiawei Ji Lijun Cheng Zhiwen Gu Chong Tan Kwangchol Ri Changjin Tang School of environment Nanjing Normal UniversityNanjing210023China Department of Mining engineering Kim Chaek University of TechnologyPyongyang999093Democratic People's Republic of Korea Laboratory of Mesoscopic Chemistry of MOe School of Chemistry and Chemical EngineeringNanjing UniversityNanjing20023China Institute of Chemical engineering Hamhung University of Chemical EngineeringHamhungDemocratic People's Republic of Korea Jiangsu Province engineering Research Center of environmental Risk Prevention and emergency Response Technology Nanjing210023China

CeO_(2)-based catalysts are widely investigated for selective catalytic reduction(SCR)of NO with *** of NO/O_(2) with CeO_(2) generally produces two surface species,i.e.,nitrates and ***,the explicit quantification of these two species is still ***,we reported that spectrophotometry characterization was effective in determining surface adsorbed NOx species on CeO_(2) by measuring the corresponding ions(NO_(2)-and NO_(3)^(-))dissolved in aqueous *** results show that both nitrate(-NO_(3))and nitrite(-NO_(2))species can be quantitatively.evaluated and the accuracy is verified by calibrating with NOx-TPD *** transfer of adsorbed NOx from catalyst surface to aqueous solution is confirmed and the dissolution process can be accelerated by ultrasonic ***,useful information related to evolution of surface NOx species under various conditions(O_(2) treatment,different adsorption temperature and duration)and over different catalysts(Fe_(2)O_(3),MnO_(2) and MnOx—CeO_(2))are *** result of present study demonstrates the potential of spectrophotometry for quantitative discrimination of surface NOx species on CeO_(2) and other oxide-based materials,which is conducive to mechanism analysis of SCR reaction.

关键词： Quantitative evaluation Spectrophotometry analysis Nitrate species Nitrite species CeO_(2)catalyst NH_(3)-SCR

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Mixed Alkali-zinc effects on Thermo-mechanical Properties in Borosilicate Glasses

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1093-1099页

作者： XIAO Guanzhou TAO yunhang ZHOU Hemin ZHeNG Qingshuang QIAO ang TAO Haizheng State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Wuhan University of Technology Advanced engineering Technology Research Institute of Zhongshan City Zhongshan 528437China

A series of mixed alkali-zinc borosilicate glasses with various r values(r=molar ratio of[ZnO]/([R^(2)O]+[ZnO]))from 0.00 to 1.00 were fabricated to probe the mixed alkali-zinc effects on thermo-mechanical *** nonlinear evolution of glass transition temperature(T_(g))with the addition of ZnO is ascribed to the competition of two converse factors,i e,the T_(g)depression as one of the colligative properties for a solution,on the one hand,and the enhancement of T_(g)due to the higher field strength of zinc cations compared to that of alkali ***,the nonlinear evolution of elastic moduli and coefficients of thermal expansion with r is attributed to the variance of intermediate-range clusters,which is confirmed by infrared and Raman scattering *** findings are very helpful in tailoring the performance of borosilicate glasses.

关键词： glass transition temperature elastic moduli coefficient of thermal expansion borosilicate glass

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A multi-platform analysis of human gingival crevicular fluid reveals ferroptosis as a relevant regulated cell death mechanism during the clinical progression of periodontitis

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International Journal of Oral Science 2024年第2期16卷 265-279页

作者： Alfredo Torres M.angélica Michea Ákos Végvári Marion Arce Valentina Pérez Marcela Alcota Alicia Morales Rolando Vernal Mauricio Budini Roman A.Zubarev Fermín e.González Laboratory of experimental Immunology&Cancer Faculty of DentistryUniversity of ChileSantiagoChile Department of Conservative Dentistry Faculty of DentistryUniversity of ChileSantiagoChile Division of Chemistry I Department of Medical Biochemistry and BiophysicsKarolinska InstitutetStockholmSweden Periodontal Biology Laboratory Faculty of DentistryUniversidad de ChileSantiagoChile Laboratory of Cellular and Molecular Pathology Institute for Research in Dental SciencesFaculty of DentistryUniversity of ChileSantiagoChile

Ferroptosis is implicated in the pathogenesis of numerous chronic-inflammatory diseases,yet its association with progressive periodontitis remains *** investigate the involvement and significance of ferroptosis in periodontitis progression,we assessed sixteen periodontitis-diagnosed *** progression was clinically monitored over twelve weeks via weekly clinical evaluations and gingival crevicular fluid(GCF)collection was performed for further *** metrics,proteomic data,in silico methods,and bioinformatics tools were combined to identify protein profiles linked to periodontitis progression and to explore their potential connection with *** western blot analy.es validated key ***,a single-cell RNA sequencing(scRNA-seq)dataset(GSe164241)for gingival tissues was analy.ed to elucidate cellular dynamics during periodontitis *** progression was identified as occurring at a faster rate than traditionally *** samples from progressing and non-progressing periodontal sites showed quantitative and qualitatively distinct proteomic *** addition,specific biological processes and molecular functions during progressive periodontitis were revealed and a set of hub proteins,including SNCA,CA1,HBB,SLC4A1,and ANK1 was strongly associated with the clinical progression status of ***,we found specific proteins-drivers or suppressors-associated with ferroptosis(SNCA,FTH1,HSPB1,CD44,and GCLC),revealing the co-occurrence of this specific ty.e of regulated cell death during the clinical progression of ***,the integration of quantitative proteomic data with scRNA-seq analysis suggested the susceptibility of fibroblasts to *** analy.es reveal proteins and processes linked to ferroptosis for the first time in periodontal patients,which offer new insights into the molecular mechanisms of progressive periodontal *** findings may le

关键词： finding progression faster

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Nitrogen deposition mediates more stochastic processes in structuring plant community than soil microbial community in the eurasian steppe

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Science China(Life Sciences) 2024年第4期67卷 778-788页

作者： Wei yang Shuhan Zhang ang Li Junjie yang Shuang Pang Zonghao Hu Zhiping Wang Xingguo Han Ximei Zhang Key Laboratory of Dryland Agriculture Ministry of AgricultureInstitute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural SciencesBeijing 100081China State Key Laboratory of Vegetation and environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

Anthropogenic environmental changes may affect community assembly through mediating both deterministic(e.g.,competitive exclusion and environmental filtering)and stochastic processes(e.g.,birth/death and dispersal/colonization).It is traditionally thought that environmental changes have a larger mediation effect on stochastic processes in structuring soil microbial community than aboveground plant community;however,this hypothesis remains largely *** we report an unexpected pattern that nitrogen(N)deposition has a larger mediation effect on stochastic processes in structuring plant community than soil microbial community(thoseeter,including archaea,bacteria,fungi,and protists)in the eurasian *** performed a ten-year nitrogen deposition experiment in a semiarid grassland ecosystem in Inner Mongolia,manipulating nine rates(0–50 g N m^(-2)per year)at two frequencies(nitrogen added twice or 12 times per year)under two grassland management strategies(fencing or mowing).We separated the compositional variation of plant and soil microbial communities caused by.each treatment into the deterministic and stochastic components with a recently-developed *** nitrogen addition rate increased,the relative importance of stochastic component of plant community first increased and then decreased,while that of soil microbial community first decreased and then *** the whole,the relative importance of stochastic component was significantly larger in plant community(0.552±0.035;mean±standard error)than in microbial community(0.427±0.035).Consistently,the proportion of compositional variation explained by the deterministic soil and community indices was smaller for plant community(0.172–0.186)than microbial community(0.240–0.767).Meanwhile,as nitrogen addition rate increased,the linkage between plant and microbial community composition first became weaker and then became *** larger stochasticity in plant community relative to microbial

关键词： deterministic process environmental change grassland restoration nitrogen deposition stochastic process

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Molecular properties of dissolved organic matter across earth systems: A meta-analysis

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Journal of earth Science 2024年

作者： Lei Han ang Hu Hellen Lucas Mzuka Xingting Chen Ji Shen Jianjun Wang Key Laboratory of Lake and Watershed Science for Water Security， Nanjing Institute of Geography and Limnology， Chinese Academy of Sciences School of Geography and Ocean Science， Nanjing University

Dissolved organic matter （DOM） represents the largest pool of reactive carbon on the earth and plays a crucial role in various biogeochemical processes and ecosystem functions. However， it is understudied for a global understanding of DOM molecular properties such as molecular weight， stoichiometry， and oxidation state， and the linkages among them across earth systems. Here， a meta-analysis of 2，707 sites in 204 literatures was conducted by synthesizing four representative molecular properties of DOM， i.e.， mass， double bond equivalent （DBe）， modified aromaticity index (AImod)， and nominal oxidation state of carbon （NOSC）. By.exploring H/C and O/C ratios， we examined the relationships among these DOM properties across waters and land systems， and their geographical patterns and environmental drivers. We found that， compared to land system， the mass， DBe， and AImodwere all significantly higher in water systems， with river sediments exhibiting the highest values. DOM oxidation state indicated by NOSC was greater on average in wastewater （NOSC = 0.226 ± 0.06） and marine water （NOSC = 0.133 ± 0.06） than in other habitats. Compared to waters， the mass in land system showed more strongly positive correlations with oxidation states such as NOSC and O/C， and the NOSC showed stronger relations to bioavailability properties such as DBe， AImod， and H/C. Among all the properties， H/C and AImodcontributed to the most variations in global DOM properties. In waters， NOSC monotonically increased towards high latitudes， while DBe and AImodshowed significant hump-shaped patterns indicating peaked unsaturation and aromaticity at mid-latitudes of approximately absolute 30°-50°. The variations in DOM properties were significantly correlated with environmental factors such as annual mean temperature and pH. Collectively， we revealed the spatial distribution and environmental drivers of DOM molecular properties across earth ecosystems， which could shed light on our comprehensive understan

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A neural m^(6)A pathway regulates behavioral aggregation in migratory locusts

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Science China(Life Sciences) 2024年第6期67卷 1242-1254页

作者： Xianliang Huang Qing Li yanan Xu ang Li Shanzheng Wang yusheng Chen Chunrui Zhang Xia Zhang Hailin Wang Cong Lv Baofa Sun Shaoqin Li Le Kang Bing Chen School of Life Science Institutes of Life Science and Green DevelopmentHebei UniversityBaoding 071002China College of Plant Science and Technology Huazhong Agricultural UniversityWuhan 430070China State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China Institute of Health Sciences Anhui UniversityHefei 230601China Beijing Institute of Genomics Chinese Academy of SciencesBeijing 100101China State Key Laboratory of environmental Chemistry and ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100101China

RNA N6-methyladenosine(m^(6)A),as the most abundant modification of messenger RNA,can modulate insect behaviors,but its specific roles in aggregation behaviors remain ***,we conducted a comprehensive molecular and physiological characterization of the individual components of the methyltransferase and demethylase in the migratory locust Locusta *** results demonstrated that MeTTL3,MeTTL14 and ALKBH5 were dominantly.expressed in the brain and exhibited remarkable responses to crowding or *** individual knockdown of methyltransferases(i.e.,MeTTL3 and MeTTL14)promoted locust movement and conspecific attraction,whereas ALKBH5 knockdown induced a behavioral shift toward the solitary ***,global transcriptome profiles revealed that m^(6)A modification could regulate the orchestration of gene expression to fine tune the behavioral aggregation of *** summary,our in vivo characterization of the m^(6)A functions in migratory locusts clearly demonstrated the crucial roles of the m^(6)A pathway in effectively modulating aggregation behaviors.

关键词： RNA methylation N^(6)-methyladenosine transcriptional orchestration aggregation behavior Locusta migratoria

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Physics of electron emission and injection in two-dimensional materials: Theory and simulation

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InfoMat 2021年第5期3卷 502-535页

作者： y.e sin ang Liemao Cao Lay Kee ang Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)SingaporeSingapore College of Physics and electronic engineering Hengyang Normal UniversityHengyangChina

electrically contacting two-dimensional(2D)materials is an inevitable process in the fabrication of devices for both the study of fundamental nanoscale charge transport physics and the design of high-performance novel electronic and optoelectronic *** physics of electrical contact formation and interfacial charge injection critically underlies the performance,energyefficiency and the functionality of 2D-material-based devices,thus representing one of the key factors in determining whether 2D materials can be successfully implemented as a new material basis for the development of nextgeneration beyond-silicon solid-state device *** this review,the recent developments in the theory and the computational simulation of electron emission,interfacial charge injection and electrical contact formation in 2D material interfaces,heterostructures,and devices are *** on thermionic charge injection phenomena which are omnipresent in 2Dmaterials-based metal/semiconductor Schottky contacts,we summarize various transport models and scaling laws recently developed for 2D *** progress on the first-principle density functional theory simulation of 2D-material-based electrical contacts are also *** review aims to provide a crystalized summary on the physics of charge injection in the 2D Flatlands for bridging the theoretical and the experimental research communities of 2D material device physics and technology.

关键词： 2D material interfaces charge injection contact engineering heterostructures theory and simulations

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Design of an all-day.electrical power generator based on thermoradiative devices

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Science China(Technological Sciences) 2021年第10期64卷 2166-2173页

作者： ZHang Xin yang GuoFeng yAN MengQi ang Lay Kee ang y.e sin CHeN JinCan School of Science Jiangnan UniversityWuxi 214122China Science Mathematics and TechnologySingapore University of Technology and DesignSingapore 487372Singapore Department of Physics Xiamen UniversityXiamen 361005China

energy harvesting from sun and outer space using thermoradiative devices(TRDs),despite being promising renewable energy sources,is limited only to daytime and nighttime period,*** a system with 24-hour continuous electric power generation remains an open question thus ***,a TRD-based power generator that harvests solar energy via concentrated solar irradiation during daytime and via thermal infrared emission towards the outer space at nighttime is proposed,thus achieving the much sought-after 24-hour electrical power ***,a rigorous thermodynamical model is developed to investigate the all-day performance characteristics,parametric optimum design,and the role of various energy loss *** calculated results predict that the daytime TRD-based system y.elds a peak efficiency of 12.6%under 10 suns,thus sig-nificantly outperforming the state-of-art record-setting solar thermoelectric *** work reveals the potential of TRD towards 24-hour electricity generation and future renewable energy technology.

关键词： sustainable energy HgCdTe solar energy thermoradiative optimum design

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