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Unravelling the anisotropic light-matter interaction in strainengineered trihalide MoCl_(3)

Nano Research 2024年第4期17卷 2981-2987页

作者： Yuxuan Sun Ziang Liu Zeya Li Feng Qin Junwei Huang Caiyu Qiu hongtao yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210000China

Layered trihalides exhibit distinctive band structures and physical properties due to the sixfold coordinated 3d or 4d transition metal site and partially occupied d orbitals,holding great potential in condensed matter physics and advanced electronic applications.Prior research focused on trihalides with highly symmetric honeycomb-like structures,such as CrI3 andα-RuCl_(3),while the role of crystal anisotropy in trihalides remains elusive.In particular,the trihalide MoCl_(3) manifests strong in-plane crystal anisotropy with the largest difference in Mo–Mo interatomic distances.Research on such material is imperative to address the lack of investigations on the effect of anisotropy on the properties of trihalides.Herein,we demonstrated the anisotropy of MoCl_(3) through polarized Raman spectroscopy and further tuned the phonon frequency via strain engineering.We showed the Raman intensity exhibits twofold symmetry under parallel configuration and fourfold symmetry under perpendicular configuration with changing the polarization angle of incident light.Furthermore,we found that the phonon frequencies of MoCl_(3) decrease gradually and linearly with applying uniaxial tensile strain along the axis of symmetry in the MoCl_(3) crystal,while those frequencies increase with uniaxial tensile strain applied perpendicularly.Our results shed light on the manipulation of anisotropic light-matter interactions via strain engineering,and lay a foundation for further exploration of the anisotropy of trihalides and the modulation of their electronic,optical,and magnetic properties.

关键词： layered trihalide MoCl_(3) polarized Raman spectroscopy strain engineering anisotropy

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Gate-tunable spin valve effect in Fe_(3)GeTe_(2)-based van der Waals heterostructures

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InfoMat 2023年第3期5卷 1-10页

作者： Ling Zhou Junwei Huang Ming Tang Caiyu Qiu Feng Qin Caorong Zhang Zeya Li Di Wu hongtao yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingthe People's Republic of China

Magnetic tunnel junctions(MTJs),a prominent type of spintronic device based on the spin valve effect,have facilitated the development of numerous spintronic applications.The technical appeal for the next-generation MTJ devices has been proposed in two directions:improving device performance by utilizing advanced two-dimensional(2D)ferromagnetic materials or extending device functionalities by exploring the gate-tunable magnetic properties of ferromagnets.Based on the recent development of 2D magnets with the ease of external stimuli,such as electric field,due to their reduced dimensions,reliable prospects for gate-tunable MTJ devices can be achieved,shedding light on the great potential of next-generation MTJs with multiple functionalities for various application environments.While the electrical gate-tunable MTJ device is highly desirable for practical spintronic devices,it has not yet been demonstrated.Here,we demonstrate the experimental realization of a spin valve device by combining a vertical Fe_(3)GeTe_(2)/h-BN/Fe_(3)GeTe_(2) MTJ with an electrolyte gate.The magnetoresistance ratio(MR ratio)of 36%for the intrinsic MTJ confirms the good performance of the device.By electrolyte gating,the tunneling MR ratio of Fe_(3)GeTe_(2)/h-BN/Fe_(3)GeTe_(2) MTJ can be elevated 2.5 times,from 26%to 65%.Importantly,the magnetic fields at which the magnetoresistance switches for the MTJ can be modulated by electrical gating,providing a promising method to control the magnetization configuration of the MTJ.Our work demonstrates a gate-tunable MTJ device toward the possibility for gate-controlled spintronic devices,paving the way for performing 2D magnetism manipulations and exploring innovative spintronic applications.

关键词： Fe_(3)GeTe_(2)magnetic tunnel junction magnetoresistance spin valve van der Waals heterostructure

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Strain engineering of anisotropic light-matter interactions in onedimensional P-P chain of SiP_(2)

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Nano Research 2022年第8期15卷 7378-7383页

作者： Fanghua Cheng Junwei Huang Feng Qin Ling Zhou Xueting Dai Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Caiyu Qiu Yangfan Lu Huiyang Gou hongtao yuan National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied SciencesNanjing UniversityNanjing 210000China College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400030China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

Strain engineering can serve as a powerful technique for modulating the exotic properties arising from the atomic structure of materials.Examples have been demonstrated that one-dimensional(1D)structure can serve as a great platform for modulating electronic band structure and phonon dispersion via strain control.Particularly,in a van der Waals material silicon diphosphide(SiP_(2)),quasi-1D zigzag phosphorus–phosphorus(P–P)chains are embedded inside the crystal structure,and can show unique phonon vibration modes and realize quasi-1D excitons.Manipulating those optical properties by the atom displacements via strain engineering is of great interest in understanding underlying mechanism of such P–P chains,however,which remains elusive.Herein,we demonstrate the strain engineering of Raman and photoluminescence(PL)spectra in quasi-1D P–P chains and resulting in anisotropic manipulation in SiP_(2).We find that the phonon frequencies of SiP_(2)in Raman spectra linearly evolve with a uniaxial strain along/perpendicular to the quasi-1D P–P chain directions.Interestingly,by applying tensile strain along the P–P chains,the band gap energy of strained SiP_(2)can significantly decrease with a tunable value of~55 meV.Based on arsenic(As)element doping into SiP_(2),the strain-induced redshifts of phonon frequencies decrease,indicating the stiffening of the phonon vibration with the increased arsenic doping level.Such results provide an opportunity for strain engineering of the light–matter interactions in the quasi-1D P–P chains of SiP_(2)crystal for potential optical applications.

关键词： strain engineering silicon diphosphide Raman photoluminescence

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Temperature-driven reversible structural transformation and conductivity switching in ultrathin Cu_(9)S_(5)crystals

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Nano Research 2023年第7期16卷 10515-10521页

作者： Lei Zhang Zeya Li Ying Deng Li Li Zhansheng Gao Jiabiao Chen Zhengyang Zhou Junwei Huang Weigao Xu Xuewen Fu hongtao yuan Feng Luo Jinxiong Wu Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSmart Sensor Interdisciplinary Science CenterSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Ultrafast Electron Microscopy Laboratory The Ministry of Education(MOE)Key Laboratory of Weak-Light Nonlinear PhotonicsSchool of PhysicsNankai UniversityTianjin 300071China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200093China

Two-dimensional(2D)materials with reversible phase transformation are appealing for their rich physics and potential applications in information storage.However,up to now,reversible phase transitions in 2D materials that can be driven by facile nondestructive methods,such as temperature,are still rare.Here,we introduce ultrathin Cu_(9)S_(5)crystals grown by chemical vapor deposition(CVD)as an exemplary case.For the first time,their basic electrical properties were investigated based on Hall measurements,showing a record high hole carrier density of~1022 cm^(-3) among 2D semiconductors.Besides,an unusual and repeatable conductivity switching behavior at~250 K were readily observed in a wide thickness range of CVD-grown Cu_(9)S_(5)(down to 2 unit-cells).Confirmed by in-situ selected area electron diffraction,this unusual behavior can be ascribed to the reversible structural phase transition between the room-temperature hexagonalβphase and low-temperatureβ’phase with a superstructure.Our work provides new insights to understand the physical properties of ultrathin Cu_(9)S_(5)crystals,and brings new blood to the 2D materials family with reversible phase transitions.

关键词： ultrathin Cu_(9)S_(5)crystals ultrahigh carrier density reversible phase transition conductivity switching chemical vapor deposition

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Selective substitution induced anomalous phonon stiffening within quasi-one-dimensional P–P chains in SiP2

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Nano Research 2023年第1期16卷 1107-1114页

作者： Xueting Dai Feng Qin Caiyu Qiu Ling Zhou Junwei Huang Fanghua Cheng Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Shengqiang Wu Xiaoxu Zhao Yangfan Lu Huiyang Gou hongtao yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210000China School of Materials Science and Engineering Peking UniversityBeijing 100871China College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400030China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

Light-matter interactions in low-dimensional quantum-confined structures can dominate the optical properties of the materials and lead to optoelectronic applications.In anisotropic layered silicon diphosphide(SiP2)crystal,the embedded quasi-onedimensional(1D)phosphorus–phosphorus(P–P)chains directly result in an unconventional quasi-1D excitonic state,and a special phonon mode vibrating along the P–P chains,establishing a unique 1D quantum-confined system.Alloying SiP2 with the homologous element serves as an effective way to study the properties of these excitons and phonons associated with the quasi-1D P–P chains,as well as the strong interaction between these quasiparticles.However,the experimental observation and the related optical spectral understanding of SiP2 with isoelectronic dopants remain elusive.Herein,with the photoluminescence and Raman spectroscopy measurements,we demonstrate the redshift of the confined excitonic peak and the stiffening of the phonon vibration mode■of a series of Si(P1−xAsx)2 alloys with increasing arsenic(As)compositions.This anomalous stiffening of■is attributed to the selective substitution of As atoms for P atoms within the P–P chains,which is confirmed via our scanning transmission electron microscopy investigation.Such optical spectra evolutions with selective substitution pave a new way to understand the 1D quantum confinement in semiconductors,offering opportunities to explore quasi-1D characteristics in SiP2 and the resulting photonic device application.

关键词： SiP2 quasi-one-dimensional structure Raman photoluminescence phosphide

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Near room-temperature ferromagnetism in air-stable twodimensional Cr_(1−x)Te grown by chemical vapor deposition

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Nano Research 2022年第4期15卷 3763-3769页

作者： Zhansheng Gao Ming Tang Junwei Huang Jiabiao Chen Wei Ai Linglu Wu Xinyue Dong Yifei Ma Zheshan Zhang Lei Zhang Yaping Du Huixia Fu hongtao yuan Jinxiong Wu Feng Luo Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Center of Quantum Materials and Devices&College of Physics Chongqing UniversityChongqing 401331China Beijing National Laboratory for Molecular Sciences Beijing 100871China

Identifying air-stable two-dimensional(2D)ferromagnetism with high Curie temperature(T_(c))is highly desirable for its potential applications in next-generation spintronics.However,most of the work reported so far mainly focuses on promoting one specific key factor of 2D ferromagnetism(T_(c)or air stability),rather than comprehensive promotion of both of them.Herein,ultrathin Cr_(1-x)Te crystals grown by chemical vapor deposition(CVD)show thickness-dependent T_(c)up to 285 K.The out-of-plane ferromagnetic order is well preserved down to atomically thin limit(2.0 nm),as evidenced by anomalous Hall effect observed in non-encapsulated samples.Besides,the CVD-grown Cr_(1-x)Te nanosheets present excellent ambient stability,with no apparent change in surface roughness or electrical transport properties after exposure to air for months.Our work provides an alternative platform for investigation of intrinsic 2D ferromagnetism and development of innovative spintronic devices.

关键词： Cr1-xTe room-temperature ferromagnetism air stability anomalous Hall effect chemical vapor deposition

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基于CFD的汽车运输滚装船参数横摇与减摇研究

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船舶工程 2024年第2期46卷 34-39页

作者：朱璇窦培林袁洪涛刘明琛张文江苏科技大学船舶与海洋工程学院江苏镇江212003 上海外高桥造船有限公司上海200137

为探究船舶参数横摇发生条件,以一艘汽车运输滚装船为研究对象,采用计算流体力学(CFD)软件STAR-CCM+建立虚拟水池并进行数值模拟。通过模拟静水中船舶横摇自由衰减,计算出船舶的横摇固有周期;采用控制变量法分别探究波高、波长、航速和... 详细信息

为探究船舶参数横摇发生条件,以一艘汽车运输滚装船为研究对象,采用计算流体力学(CFD)软件STAR-CCM+建立虚拟水池并进行数值模拟。通过模拟静水中船舶横摇自由衰减,计算出船舶的横摇固有周期;采用控制变量法分别探究波高、波长、航速和遭遇频率等对船舶参数横摇的影响;为该船设计并搭载减摇水舱,分析减摇水舱对参数横摇的抑制效果。结果表明:在迎浪规则波中,当波浪达到一定高度,且波浪遭遇频率为船舶横摇固有频率的2倍时,该船的参数横摇最为剧烈;当减摇水舱固有周期等于该船的横摇固有周期时,减摇水舱对参数横摇现象有较好的抑制效果。

关键词：计算流体动力学汽车运输滚装船参数横摇减摇水舱

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FPSO主甲板冷却水管路系统的加速度载荷应力分析

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造船技术 2024年第1期52卷 14-18,34页

作者：王震窦培林袁洪涛陈慧敏江苏科技大学船舶与海洋工程学院江苏镇江212100 上海外高桥造船有限公司上海200137

借助船级社规范与MATLAB软件,开发可提取浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)管道任意位置处加速度的程序,以便更好地对FPSO主甲板冷却水管路系统进行应力分析。将该系统任意位置处实际加速度值和FPS... 详细信息

借助船级社规范与MATLAB软件,开发可提取浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)管道任意位置处加速度的程序,以便更好地对FPSO主甲板冷却水管路系统进行应力分析。将该系统任意位置处实际加速度值和FPSO船体重心处加速度值以均布载荷形式分别施加至管道上,利用CAESARⅡ软件分析在满载工况条件下该系统的应力变化。结果表明,在FPSO满载工况条件下,采用重心处加速度值得到的结果相较于其自身实际加速度值的作用结果会出现应力冗余和应力不足的情况,例如节点50应力增加1.01%,而节点2570应力减小0.19%。

关键词： FPSO 主甲板冷却水管路系统应力分析加速度载荷

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基于船体变形数值仿真的FPSO管道应力分析

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造船技术 2024年第3期52卷 25-30,70页

作者：卜宗儒窦培林袁洪涛王超江苏科技大学船舶与海洋工程学院江苏镇江212100 上海外高桥造船有限公司上海200137

为区别于传统经验公式计算管道应力的方法,采用有限元方法计算浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)船体变形,提取具体管道支架的位移值,并利用CAESARⅡ软件进行管道应力计算。有限元预报得到的管道应... 详细信息

为区别于传统经验公式计算管道应力的方法,采用有限元方法计算浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)船体变形,提取具体管道支架的位移值,并利用CAESARⅡ软件进行管道应力计算。有限元预报得到的管道应力更加准确,而经验公式得到偏保守的结果。建议在对FPSO管道进行初步设计时可采用经验公式方法,在进行详细设计和局部管道应力校核时可采用数值仿真方法。

关键词：浮式生产储卸油装置管道应力分析船体变形数值仿真有限元经验公式

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导管消融术治疗老年持续性心房颤动的疗效分析

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中华老年心脑血管病杂志 2024年第3期26卷 267-270页

作者：孙瑜黄金焕谢鹏国建萍苑洪涛时向民郭红阳黄亚单兆亮解放军总医院第一医学中心心血管内科北京100853

目的分析导管消融术治疗老年持续性心房颤动的疗效和术后复发的独立危险因素。方法纳入2019年1月至2021年12月于解放军总医院第一医学中心心血管内科接受导管消融术的持续性心房颤动患者194例,根据年龄分为老年组99例(≥60岁)及非老年... 详细信息

目的分析导管消融术治疗老年持续性心房颤动的疗效和术后复发的独立危险因素。方法纳入2019年1月至2021年12月于解放军总医院第一医学中心心血管内科接受导管消融术的持续性心房颤动患者194例,根据年龄分为老年组99例(≥60岁)及非老年组95例(<60岁)。比较2组患者手术特征、术后并发症及复发情况,分析老年组患者术后复发的独立危险因素。结果老年组年龄、B型钠尿肽、高血压、冠心病、CHA_(2)DS_(2)-VASc评分及HAS-BLED评分高于非老年组,男性、估算肾小球滤过率低于非老年组(P<0.05,P<0.01)。老年组左心房纤维化比例高于非老年组(30.3%vs 8.4%,P=0.001)。老年组术后出现1例心包积液,2例穿刺部位血肿,均经治疗后好转。老年组与非老年组术后1年成功率比较无显著差异(71.7%vs 69.5%,P=0.763);老年组与非老年组空白期复发率比较无显著差异(21.2%vs 21.1%,P=0.981)。心房颤动持续时间(HR=1.020,95%CI:1.007~1.032,P=0.002)和空白期复发(HR=6.781,95%CI:3.078~14.935,P=0.001)是老年组患者术后复发心房颤动的独立危险因素。结论导管消融术治疗老年持续性心房颤动安全有效,心房颤动持续时间长和空白期复发的老年患者术后1年内更容易出现复发。

关键词：心房颤动导管消融术危险因素心房颤动持续时间

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