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Strong Anisotropic Order Parameters at All-Nitride Ferromagnet/Superconductor Interfaces

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Chinese Physics Letters 2024年第2期41卷 102-111页

作者： Qiao jin Meng Yang Guozhu Song Nan Zhao Shengru Chen Haitao Hong Ting Cui Dongke Rong Qianying Wang Yiyan Fan Chen Ge Can Wang Jiachang Bi Yanwei Cao Liusuo Wu Shanmin Wang kui-juan jin Zhi-Gang Cheng Er-Jia Guo Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics&Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523808China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 315201China

Proximity effects between superconductors and ferromagnets(SC/FM)hold paramount importance in comprehending the spin competition transpiring at their *** competition arises from the interplay between Cooper pairs and ferromagnetic exchange *** proximity effects between transition metal nitrides(TMNs)are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM *** fabricated heterostructures comprising SC titanium nitride(TiN)and FM iron nitride(Fe_(3)N)with precise chemical compositions and atomically well-defined *** magnetoresistance of Fe_(3)N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external ***,the superconducting transition temperatureT_(C) and critical field of TiN experience notable suppression when proximity to Fe_(3)*** observe the intriguing competition of interfacial spin orientations near𝑇T_(C)(∼1.25 K).These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets,but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.

关键词： proximity Superconductor titanium

Two Nonmonotone Proximal Gradient Methods for Nonsmooth Optimization over the Stiefel Manifold

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Acta Mathematicae Applicatae Sinica 2024年

作者： jin-chao ZHANG juan GAO Ya-kui HUANG Xin-wei LIU School of Artificial Intelligence Hebei University of Technology Institute of Mathematics Hebei University of Technology

We propose two nonmonotone retraction-based proximal gradient methods for solving a class of nonconvex nonsmooth optimization problems over the Stiefel manifold. The proposed methods are equipped with the descent direction obtained by a proximal mapping restricted in tangent space of the manifold and the BarzilaiBorwein stepsizes determined by two recent iteration points and the corresponding descent directions. By employing, respectively, the Grippo-Lampariello-Lucidi nonmonotone line search strategy and the Dai-Fletcher nonmonotone line search strategy, our proposed methods are proved to be globally convergent. Analysis on the iteration complexity of NPGL for obtaining an?-stationary solution is provided. Numerical results on the sparse principle component analysis problems demonstrate the efficiency of our methods.

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Recent Progress in Ferroelectric Diodes: Explorations in Switchable Diode Effect

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Nano-Micro Letters 2013年第2期5卷 81-87页

作者： Chen Ge Can Wang kui-juan jin Hui-bin Lu Guo-zhen Yang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Switchable diode effect in ferroelectric diodes has attracted much attention for its potential applications in novel nonvolatile memories. We briefly review recent investigations on the switchable diode effect in ferroelectric diodes both experimentally and theoretically. Many recent studies demonstrate that the interfacial barrier between the metal-ferroelectrics could be modulated by the polarization charges, and the ferroelectric polarization that can be reversed by an external electric field plays a dominant role in the switchable diode effect. Moreover, we review a self-consistent numerical model, which can well describe the switchable diode effect in ferroelectric diodes. Based on this model, it can be predicted that it is a better choice to select metals with a smaller permittivity, such as noble metals, to obtain a more pronounced switchable diode effect in ferroelectric diodes.

关键词： Ferroelectric diodes Switchable diode effect Metal/ferroelectrics/metal structure Self-consistent mode

Surface protonation and oxygen evolution activity of epitaxial La(1-x)SrxCoO3 thin films

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 77-82页

作者： XiaoShuo Wang Liang Zhou MengXin Li Yi Luo TieYing Yang TianLi Wu XiaoLong Li kui-juan jin Er-Jia Guo LiFen Wang XueDong Bai WeiFeng Zhang HaiZhong Guo Henan Key Laboratory of Photovoltaic Materials School of Physics and ElectronicsHenan UniversityKaifeng 475004China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

As an alternative electrode material,transition metal oxides are promising candidates due to multivalent nature and oxygen vacancies present in the structure with facilitate redox *** aim of this study is to explore the intrinsic mechanism of oxygen evolution reaction(OER)using two-dimensional thin film La1-xSrxCoO3 electrode as a ***,we report a planar two-dimensional model La1-xSrxCoO3 electrode grown on a Nb-SrTiO3 single-crystal substrate via pulsed laser *** two-dimensional La1-xSrxCoO3 films offer different oxygen evolution activities at different pH electrolyte *** mechanisms behind the variations of the oxygen evolution activity were discussed after comparing the oxygen evolution activity before and after treatments of the electrodes and measurements by various test *** results of this study offer a promising,low-cost electrode material for the efficient OER and a sustainable production of hydrogen fuel.

关键词： oxygen evolution reaction La1-xSrxCoO3 thin films lattice oxygen protonation

Potentiation of the lateral habenula-ventral tegmental area pathway underlines the susceptibility to depression in mice with chronic pain

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Science China(Life Sciences) 2024年第1期67卷 67-82页

作者： Chun-kui Zhang Pan Wang Yuan-Yuan Ji Jian-Shuai Zhao Jun-Xiang Gu Xian-Xia Yan Hong-Wei Fan Ming-Ming Zhang Yu Qiao Xiao-Die Liu Bao-juan Li Ming-Hui Wang Hai-Long Dong Hao-Hong Li Peng-Cheng Huang Yun-Qing Li Wu-Gang Hou jin-Lian Li Tao Chen Department of Anatomy and K.K.Leung Brain Research Centre Fourth Military Medical UniversityXi’an 710032China Beijing Institute of Basic Medical Sciences Beijing 100850China Key Laboratory of Ministry of Public Health for Forensic Science Xi’an Jiaotong UniversityXi’an 710061China Department of Anesthesiology Xijing HospitalFourth Military Medical UniversityXi’an 710032China Department of Neurosurgery the Second Affiliated Hospital of Xian Jiaotong UniversityXi’an 710004China School of Biomedical Engineering Fourth Military Medical UniversityXi’an 710032China Affiliated Mental Health Centre and Hangzhou Seventh People’s Hospital Zhejiang University School of MedicineHangzhou 310013China The MOE Frontier Research Center of Brain&Brain-machine Integration Zhejiang University School of Brain Science and Brain MedicineHangzhou 310058China Department of Neurology The First Affiliated Hospital of Nanchang UniversityNanchang 330006China Department of Anatomy School of MedicineNorthwest UniversityXi’an 710069China

Chronic pain often develops severe mood changes such as ***,how chronic pain leads to depression remains elusive and the mechanisms determining individuals’responses to depression are largely *** we found that depression-like behaviors could only be observed in 67.9%of mice with chronic neuropathic pain,leaving 32.1%of mice with depression *** determined that the spike discharges of the ventral tegmental area(VTA)-projecting lateral habenula(LHb)glutamatergic(Glu)neurons were sequentially increased in sham,resilient and susceptible mice,which consequently inhibited VTA dopaminergic(DA)neurons through a LHbGlu-VTAGABA-VTADA ***,the LHbGlu-VTADA excitatory inputs were dampened via GABAB receptors in a pre-synaptic *** of LHb-VTA pathway largely affected the development of depressive symptoms caused by chronic *** study thus identifies a pivotal role of the LHb-VTA pathway in coupling chronic pain with depression and highlights the activity-dependent contribution of LHbGlu-to-VTADA inhibition in depressive behavioral regulation.

关键词： chronic pain depression lateral habenula ventral tegmental area dopamine susceptibility

A synaptic transistor with NdNiO3

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Chinese Physics B 2020年第9期29卷 31-35页

作者：汪翔葛琛李格郭尔佳何萌王灿杨国桢金奎娟 Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Recently, neuromorphic devices for artificial intelligence applications have attracted much attention. In this work, a three-terminal electrolyte-gated synaptic transistor based on NdNiO3 epitaxial films, a typical correlated electron material, is presented. The voltage-controlled metal-insulator transition was achieved by inserting and extracting H+ ions in the NdNiO3 channel through electrolyte gating. The non-volatile conductance change reached 104 under a 2 V gate voltage. By manipulating the amount of inserted protons, the three-terminal NdNiO3 artificial synapse imitated important synaptic functions, such as synaptic plasticity and spike-timing-dependent plasticity. These results show that the correlated material NdNiO3 has great potential for applications in neuromorphic devices.

关键词： synaptic transistor electrolyte gating artificial synapse NdNiO3 pulsed laser deposition

Diagnosis,treatment and prevention of severe acute respiratory syndrome coronavirus 2 infection in children:experts'consensus statement updatedforthe Omicron variant

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World Journal of Pediatrics 2024年第3期20卷 272-286页

作者： Rong-Meng Jiang Zheng-De Xie Yi Jiang Xiao-Xia Lu Run-Ming jin Yue-Jie Zheng Yun-Xiao Shang Bao-Ping Xu Zhi-Sheng Liu Gen Lu Ji-kui Deng Guang-Hua Liu Xiao-Chuan Wang Jian-She Wang Lu-Zhao Feng Wei Liu Yi Zheng Sai-Nan Shu Min Lu Wan-Jun Luo Miao Liu Yu-Xia Cui Le-Ping Ye A-Dong Shen Gang Liu Li-Wei Gao Li-juan Xiong Yan Bai Li-Kai Lin Zhuang Wei Feng-Xia Xue Tian-You Wang Dong-Chi Zhao Jian-Bo Shao Daniel Kwok-keung Ng Gary Wing-kin Wong Zheng-Yan Zhao Xing-Wang Li Yong-Hong Yang Kun-Ling Shen Diagnosis and Treatment Center of Infectious Diseases Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Beijing Key Laboratory of Pediatric Respiratory Infection Diseases Key Laboratory of Major Diseases in ChildrenMinistry of EducationNational Clinical Research Center for Respiratory DiseasesResearch Unit of Critical Infection in ChildrenChinese Academy of Medical Sciences2019RU016Laboratory of Infection and VirologyBeijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing 100045China Department of Pediatrics Renmin Hospital of Wuhan UniversityWuhan 430060China Department of Respiratory Wuhan Children's HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430016China Department of Pediatrics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Respiratory Shenzhen Children's HospitalShenzhen 518038China Department of Pediatric Respiratory Shengjing Hospital Affiliated to China Medical UniversityShenyang 110004China Department of Respiratory Beijing Children's HospitalCapital Medical UniversityNational Clinical Research Center for Respiratory DiseasesNational Center for Children's HealthBeijing 100045China Department of Neurology Wuhan Children's HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430016China Department of Respiratory Guangzhou Women and Children's Medical CenterGuangzhou 510623China Department of Infectious Diseases Shenzhen Children's HospitalShenzhen 518038China Department of Pediatrics Fujian Branch of Shanghai Children's Medical CenterFujian Children's HospitalFuzhou350005China Department of Clinical Immunology and Allergy Children's Hospital of Fudan UniversityNational Center for Children's HealthShanghai 201102China Department of Infectious Diseases Children's Hospital of Fudan UniversityNational Center for Children's Health.Shanghai

It has been more than 3 years since the novel coronavirus(SARS-CoV-2)pandemic raged *** coronavirus disease 2019(COVID-19)has greatly influenced human *** to data from the World Health Organization(WHO),there were ove... 详细信息

关键词： prevention infection statement

1.27 μm O_(2)(a^(1)Δ g)气辉临边观测辐射传输特性

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光谱学与光谱分析 2024年第4期44卷 1088-1097页

作者：王道琦王后茂何微微胡向瑞李娟李发泉武魁军烟台大学物理与电子信息学院山东烟台264005 中国科学院国家空间科学中心北京100190 中国科学院西安光学精密机械研究所陕西西安710119 中国科学院精密测量科学与技术创新研究院湖北武汉430071

1.27μm波段的O_(2)(a^(1)Δg)气辉辐射具有辐射信号强、空间跨度大、自吸收效应弱等诸多内禀优势,是临近空间大气遥感的重要目标源,对于中高层大气的动力学及热学特性研究,全球温室气体探测,以及臭氧浓度三维层析等卫星遥感具有重要的... 详细信息

1.27μm波段的O_(2)(a^(1)Δg)气辉辐射具有辐射信号强、空间跨度大、自吸收效应弱等诸多内禀优势,是临近空间大气遥感的重要目标源,对于中高层大气的动力学及热学特性研究,全球温室气体探测,以及臭氧浓度三维层析等卫星遥感具有重要的科学意义和应用价值。首先基于O_(2)(a^(1)Δg)光化学反应模型,研究了O_(2)(a^(1)Δg)气辉的产生机制及湮灭机理,在此基础上,计算得到了O_(2)(a^(1)Δg)气辉体辐射率廓线,并基于HITRAN数据库给出的谱线强度及爱因斯坦系数,提出了两种计算O_(2)(a^(1)Δg)气辉光谱分布的方法。采用最新的分子光谱参数、光化学反应速率常数及F10.7太阳紫外通量等参数,结合光化学反应模型计算得到的O_(2)(a^(1)Δg)气辉体辐射率廓线信息,借助逐线积分算法,建立了1.27μm O_(2)(a^(1)Δg)气辉临边观测辐射传输理论模型,并分析了自吸收效应对不同临边观测高度处气辉辐射光谱强度的影响。然后,利用剥洋葱算法,对大气图像扫描成像吸收光谱仪(SCIAMACHY)在临边观测模式下测得的O_(2)分子近红外大气带的气辉辐射信号进行处理得到了目标层O_(2)(a^(1)Δg)气辉辐射光谱,并通过谱积分算法反演得到了O_(2)(a^(1)Δg)气辉的体辐射率廓线信息。最后通过对比气辉临边观测辐射传输理论模型计算得到的以及SCIAMACHY仪器测量反演得到的1.27μm O_(2)(a^(1)Δg)辐射光谱及体辐射率廓线信息,验证1.27μm O_(2)(a^(1)Δg)气辉临边观测辐射传输理论模型的可靠性与合理性。基于比对结果,对O_(2)(a^(1)Δg)气辉临边辐射强度和体辐射率的影响因素进行了分析。分析结果表明,在50 km以上的高空区域,理论计算结果与卫星实测结果吻合性较好,而随着海拔高度的降低,两者的偏差逐渐增大,这是因为在临边观测模式下,中低空区域的卫星遥感信号受自吸收效应及大气散射效应影响严重。此外,与HITRAN数据库给出的谱线强度参数相比,基于爱因斯坦系数建立的O_(2)(a^(1)Δg)气辉临边辐射模型与卫星实测结果更加吻合。1.27μm O_(2)(a^(1)Δg)气辉临边观测辐射传输理论模型的建立,对于临近空间大气遥感,奠定了理论基础。

关键词： O_(2)(a^(1)Δg)气辉体辐射率临边观测辐射传输理论模型

Interfacial-Strain-Induced Structural and Polarization Evolutions in Epitaxial Multiferroic BiFeO_3(001) Thin Films

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功能材料信息 2015年第3期12卷 19-27页

作者：郭海中 Ruiqiang Zhao kui-juan jin Lin Gu Dongdong Xiao Zhenzhong Yang Xiaolong Li Le Wang Xu He Junxing Gu Qian Wan Can Wang Huibin Lu Chen Ge Meng He Guozhen Yang 中科院物理所 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Collaborative Innovation Center of Quantum Matter Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Institute of Applied PhysicsChinese Academy of Sciences

Varying the film thickness is a precise route to tune the interfacial strain to manipulate the properties of the multiferroic ***,to explore the effects of the interfacial strain on the properties of the multiferroic BiFeO_3films,we investigated thickness-dependent structural and polarization evolutions of the BiFeO_3 *** epitaxial growth with an atomic stacking sequence of BiO/TiO_2 at the interface was confirmed by scanning transmission electron *** X-ray diffraction experiments and first-principles calculations,a thickness-dependent structural evolution was observed from a fully strained tetragonality to a partially relaxed one without any structural phase transition or rotated *** tetragonality(c/a) of the BiFeO_3 films increases as the film thickness decreases,while the polarization is in contrast with this trend,and the size effect including the depolarization field plays a crucial role in this contradiction in thinner *** findings offer an alternative strategy to manipulate structural and polarization properties by tuning the interfacial strain in epitaxial multiferroic thin films.

关键词：功能材料材料科学材料 BFO