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Gate Tunable Labyrinth Domain Structures in a van der Waals Itinerant Ferromagnet Cr_(7)Te_(8)

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Chinese Physics Letters 2024年第9期41卷 122-132页

作者： Kui Meng Zeya Li Yicheng Shen Xiangyu Bi Junhao Rao Yuting Qian Zhansheng Gao Peng Chen Caiyu Qiu Feng Qin Jinxiong Wu Feng Luo Junwei Huang 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 center for the Physics of low-dimensional Materials Henan Joint International Research Laboratory of New Energy Materials and DevicesSchool of Physics and ElectronicsHenan UniversityKaifeng 475004China 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

Manipulating magnetic domain structure plays a key role in advanced spintronics *** rationale is that the labyrinthine domain structure,normally appearing in ferromagnetic thin films with strong magnetic anisotropy,shows a great potential to increase data storage density for designing magnetic nonvolatile memory and logic ***,an electrical control of labyrinthine domain structure remains ***,we demonstrate the gate-driven evolution of labyrinthine domain structures in an itinerant ferromagnet Cr_(7)Te_(8).By combining electric transport measurements and micromagnetic finite difference simulations,we find that the hysteresis loop of anomalous Hall effect in Cr_(7)Te_(8)samples shows distinct features corresponding to the generation of labyrinthine domain *** labyrinthine domain structures are found to be electrically tunable via Li-electrolyte gating,and such gate-driven evolution in Cr_(7)Te_(8)originates from the reduction of the magnetic anisotropic energy with gating,revealed by our micromagnetic *** results on the gate control of anomalous Hall effect in an itinerant magnetic material provide an opportunity to understand the formation and evolution of labyrinthine domain structures,paving a new route towards electric-field driven spintronics.

关键词： rational electrolyte ferromagnetic

Linear dichroism transition and polarization-sensitive photodetector of quasi-one-dimensional palladium bromide

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Chinese Physics B 2024年第6期33卷 532-539页

作者：朱万里甄伟立牛瑞焦珂珂岳智来胡慧杰薛飞张昌锦 Anhui Key Laboratory of low-energy Quantum Materials and devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch Graduate School of University of Science and Technology of ChinaHefei 230026China School of Physics Hefei University of TechnologyHefei 230601China collaborative innovation center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Perpendicular optical reversal of the linear dichroism transition has promising applications in polarization-sensitive optoelectronic devices. We perform a systematical study on the in-plane optical anisotropy of quasi-one-dimensional PdBr_(2) by using combined measurements of the angle-resolved polarized Raman spectroscopy(ARPRS) and anisotropic optical absorption spectrum. The analyses of ARPRS data validate the anisotropic Raman properties of the PdBr_(2) *** anisotropic optical absorption spectrum of PdBr_(2) nanoflake demonstrates distinct optical linear dichroism reversal. Photodetector constructed by PdBr_(2) nanowire exhibits high responsivity of 747 A·W^(-1) and specific detectivity of 5.8×10^(12) Jones. And the photodetector demonstrates prominent polarization-sensitive photoresponsivity under 405-nm light irradiation with large photocurrent anisotropy ratio of 1.56, which is superior to those of most of previously reported quasi-one-dimensional counterparts. Our study offers fundamental insights into the strong optical anisotropy exhibited by PdBr_(2), establishing it as a promising candidate for miniaturization and integration trends of polarization-related applications.

关键词： linear dichroism reversal polarization sensitivity anisotropy polarized photodetector

Gate-tunable Berry curvature in van der Waals itinerant ferromagnetic Cr_(7)Te_(8)

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InfoMat 2024年第3期6卷 108-116页

作者： Kui Meng Zeya Li Zhansheng Gao Xiangyu Bi Peng Chen Feng Qin Caiyu Qiu Lingyun Xu Junwei Huang Jinxiong Wu Feng Luo Hongtao Yuan National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjingthe People's Republic of China center for the Physics of low-dimensional Materials Henan Joint International Research Laboratory of New Energy Materials and DevicesSchool of Physics and ElectronicsHenan UniversityKaifengthe People's Republic of China 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 UniversityTianjinthe People's Republic of China

The anomalous Hall effect(AHE)that associated with the Berry curvature of occupied electronic states in momentum-space is one of the intriguing aspects in condensed matter physics,and provides an alternative for potential applications in topological *** experiments reported the tunable Berry curvature and the resulting magnetization switching process in the AHE based on strain engineering or chemical ***,the AHE modulation by these strategies are usually irreversible,making it difficult to realize switchable control of the AHE and the resultant spintronic ***,we demonstrated the switchable control of the Berry-curvature-related AHE by electrical gating in itinerant ferromagnetic Cr_(7)Te_(8)with excellent ambient *** gate-tunable sign reversal of the AHE can be attributed to the redistribution of the Berry curvature in the band structure of Cr_(7)Te_(8)due to the intercalation-induced change in the Fermi *** work facilitates the applications of magnetic switchable devices based on gate-tunable Berry curvature.

关键词： anomalous Hall effect Berry curvature van der Waals itinerant ferromagnetism

Pd single atoms cooperate with S vacancies in ZnIn_(2)S_(4) nanosheets for photocatalytic pure-water splitting

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Science China Chemistry 2024年第3期67卷 855-861页

作者： Lin Sun Huiping Peng Fei Xue Shangheng Liu Zhiwei Hu Hongbo Geng Xiaozhi Liu Dong Su Yong Xu Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Guangzhou Key Laboratory of low-dimensional Materials and Energy Storage devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Max Planck Institute for Chemical Physics of Solids Nothnitzer Strasse 40Dresden 01187Germany School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesBeijing 100190China innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

Photocatalytic water splitting has emerged as a new frontier for converting solar energy to green H_(2) and value-added ***,great challenges still remain for developing efficient photocatalysts for pure water splitting without sacrificial *** this work,we demonstrate that doping hexagonal ZnIn_(2)S_(4)(ZIS) with Pd single atoms(Pd_(0.03)/ZIS) can serve as a highly efficient photocatalyst for pure water splitting to simultaneously produce H_(2) and H_(2)O_(2) without any sacrificial *** from aberration-corrected high-angle annular dark field scanning transmission electron microscopy,X-ray fine spectroscopy,insitu electron paramagnetic resonance and diffuse Fourier transform infrared spectroscopy reveal that doping ZIS with Pd single atoms facilitates the formation of S vacancies(S_(v)),where the photogenerated electrons can transfer to Pd single atoms,as a result of enhanced separation of electron-hole pairs and improved photocatalytic ***,Pd_(0.03)/ZIS displays a stoichiometric ratio of H_(2) and H_(2)O_(2) with the productivity of 1,037.9 and 1,021.4μmol g^(-1)h^(-1),respectively,which has largely outperformed pure ZIS and other reported catalysts for pure water *** work provides an efficient photocatalyst for water splitting to produce H_(2) and H_(2)O_(2),which may attract rapid interest in materials science,chemistry,and heterogeneous catalysis.

关键词： ZnIn_(2)S_(4) Pd single atom S vacancy pure water splitting H_(2)O_(2)

low-thermal-budget synthesis of monolayer MoS2

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Science China Materials 2024年第1期67卷 372-374页

作者： Zongmeng Yang Shibo Fang Jing Lu State Key Laboratory for Mesoscopic Physics and School of Physics Peking University collaborative innovation center of Quantum Matter Beijing Key Laboratory for Magnetoelectric Materials and devices (BKL-MEMD) Peking University Peking University Yangtze Delta Institute of optoelectronics Key Laboratory for the Physics and Chemistry of Nanodevices Peking University Beijing Key Laboratory of Quantum devices Peking University

Two-dimensional (2D) materials, such as MoS2, have been considered as a competitive coordinate for future electronics due to their excellent electrostatics and high mobility [1–3]. Moreover, the potential integration of 2D materials with silicon circuits can present increased density and multifunction in future heterogeneously integrated circuits [4,5]. However, the high thermal-budget during Mo S2 synthesis exceeds the temperature requirement of direct integration with Si in the back-end-of-line (BEOL) fabrication process [6–8].

关键词： FILMS

The higher-order topological pumping explored in the 2D acoustic crystal

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 127-133页

作者： Yanqiu Wang Bin Liang Jianchun Cheng Key Laboratory of Modern Acoustics Ministry of EducationInstitute of AcousticsDepartment of PhysicsNanjing UniversityNanjing 210093China collaborative innovation center of Advanced Microstructures Nanjing UniversityNanjing 210093China

The topological pumping has been instrumental in advancing our understanding of topological phase transitions in various physical systems,which can be extended to uncover intriguing higher-order topological phases in the lower-dimensional ***,we propose a theoretical exploration of topological dipole pumping on an acoustic square superlattice by cyclically modulating intracell couplings,which shares the topological nature of an extended three-dimensional system with chiral hinge *** the multipole chiral numbers,we characterize the higher-order topological phases that arise during the *** evolution of topological phase transitions is verified by numerical simulations and shows corner states are transferred across the *** findings can inspire the construction of chiral hinge states in artificial crystals,opening up new possibilities for the design of devices allowing the unidirectional propagation of sound.

关键词： topological phases of matter Thouless pumping acoustic metamaterial

Phase engineering of Pd–Te nanoplates via potential energy trapping

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eScience 2024年第2期4卷 117-126页

作者： Mengjun Wang Jun Jia Hao Yan Guang Li Qiming Hong Yuzheng Guo Yong Xu Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Guangzhou Key Laboratory of low-dimensional Materials and Energy Storage devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangdong510006China School of Electrical Engineering and Automation Wuhan UniversityHubei430072China Testing and Analysis center College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen361005China

Phase modulation of noble metal alloys(NMAs)is critically important in nanoscience since the distinct atomic arrangements can largely determine their physicochemical ***,the precise modulation of NMAs is formidably challenging,because thermodynamically stable phases are generally preferential compared to those metastable ***,we proposed a potential energy trapping strategy for phase modulation of Pd–Te alloys with ***,ethylene glycol can increase the energy barrier for both Pd leaching and Te introduction,forming metastable Pd20Te7 ***,N,N-dimethylformamide is unable to trap metastable phase,inducing the phase evolution to thermodynamically stable PdTe phase,and the precise phase modulation was realized including Pd20Te7,PdTe and PdTe2 *** Pd–Te alloys displayed phase-dependent formic acid oxidation catalytic performance with PdTe phase showing the *** work proposes a strategy for creating metastable phase with potential energy trap,which may deepen the understanding of phase engineering for noble metal-based nanocrystals.

关键词： Potential energy trap Phase modulation Metastable Pd-Te alloys

Interplay between topology and localization on superconducting circuits

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Chinese Physics B 2024年第6期33卷 240-246页

作者：关欣霍炳燕陈刚 Department of Materials and Chemical Engineering Taiyuan UniversityTaiyuan 030032China State Key Laboratory of Quantum Optics and Quantum Optics devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China collaborative innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China School of Physics Zhengzhou UniversityZhengzhou 450001China

Topological insulators occupy a prominent position in the realm of condensed matter physics. Nevertheless, the presence of strong disorder has the potential to disrupt the integrity of topological states, leading to the localization of all *** study delves into the intricate interplay between topology and localization within the one-dimensional Su–Schrieffer–Heeger(SSH) model, which incorporates controllable off-diagonal quasi-periodic modulations on superconducting *** the application of external alternating current(ac) magnetic fluxes, each transmon undergoes controlled driving,enabling independent tuning of all coupling strengths. Within a framework of this model, we construct comprehensive phase diagrams delineating regions characterized by extended topologically nontrivial states, critical localization, and coexisting topological and critical localization phases. The paper also addresses the dynamics of qubit excitations, elucidating distinct quantum state transfers resulting from the intricate interplay between topology and localization. Additionally, we propose a method for detecting diverse quantum phases utilizing existing experimental setups.

关键词： topology localization superconducting circuits

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双功能添加剂策略制备高效钙钛矿太阳电池

Science China Materials 2024年第8期67卷 2628-2636页

作者：吴炯桦杭陈旺王仁杰郑巧邓辉张彩霞王伟煌李冬梅李一明程树英 College of Physics and Information Engineering Institute of Micro-Nano Devices and Solar CellsFuzhou UniversityFuzhou 350108China Fujian Science&Technology innovation Laboratory for optoelectronic Information of China Fuzhou 350108China Jiangsu collaborative innovation center of Photovoltaic Science and Engineering Changzhou 213164China Key Laboratory for Renewable Energy Chinese Academy of Sciences Beijing Key Laboratory for New Energy Materials and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

目前针对提高钙钛矿太阳能电池(PSCs)效率的研究发展迅速,效率已经达到26%.然而,在制备高效率PSCs时经常会使用过量PbI_(2),过量的PbI_(2)会导致电池的稳定性缺陷.为了解决这一问题,我们引入了阴阳离子共同作用的双功能添加剂苯乙胺三... 详细信息

目前针对提高钙钛矿太阳能电池(PSCs)效率的研究发展迅速,效率已经达到26%.然而,在制备高效率PSCs时经常会使用过量PbI_(2),过量的PbI_(2)会导致电池的稳定性缺陷.为了解决这一问题,我们引入了阴阳离子共同作用的双功能添加剂苯乙胺三氟乙酸盐(PEATFA),来钝化钙钛矿薄膜中的缺陷和过量的PbI_(2),以协同钝化钙钛矿太阳能电池.PEA^(+)阳离子促进二维钙钛矿生成,而TFA^(-)阴离子钝化未配位的Pb_(2+)离子和碘空位,从而提高了钙钛矿晶体质量.此外,PEATFA的引入优化了钙钛矿与空穴传输层之间的能级匹配,从而提高了其电荷传输和抽取能力.最终,我们成功实现了PSCs 24.05%的光电转换效率,同时PSCs表现出最小的滞后现象和良好的稳定性.

关键词：钙钛矿太阳能电池光电转换效率钙钛矿太阳电池功能添加剂滞后现象钙钛矿薄膜晶体质量能级匹配