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Non-centrosymmetric topological phase probed by non-linear Hall effect

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National Science Review 2024年第6期11卷 180-188页

作者： Naizhou Wang Jing-Yang You Aifeng Wang Xiaoyuan Zhou Zhaowei Zhang Shen Lai Yuan-Ping Feng Hsin Lin Guoqing Chang Wei-bo Gao Division of physics and Applied physics School of Physical and Mathematical Sciences Nanyang Technological University department of physics National University of Singapore Low Temperature physics Laboratory College of Physics and Center for Quantum Materials and Devices Chongqing University Centre for Advanced 2D materials National University of Singapore Institute of physics Academia Sinica The Photonics Institute and Centre for Disruptive Photonic Technologies Nanyang Technological University

Non-centrosymmetric topological material has atracted intense atention due to its superior characteristics as compared with the centrosymmetric one, although probing the local quantum geometry in non-centrosymmetric topological material remains challenging. The non-linear Hall（NLH） effect provides an ideal tool to investigate the local quantum geometry. Here, we report a non-centrosymmetric topological phase in ZrTe5, probed by using the NLH effect. The angle-resolved and temperature-dependent NLH measurement reveals the inversion and ab-plane mirror symmetries breaking at <30 K, consistently with our theoretical calculation. Our findings identify a new non-centrosymmetric phase of ZrTe5and provide a platform to probe and control local quantum geometry via crystal symmetries.

关键词： non-linear Hall effect topological insulator ZrTe5

Origin of the near-room temperature resistance transition in lutetium with H2/N2 gas mixture under high pressure

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National Science Review 2024年第7期11卷 26-32页

作者： Di Peng Qiaoshi Zeng Fujun Lan Zhenfang Xing Zhidan Zeng Xiaoxing Ke Yang Ding Ho-kwang Mao Key Laboratory of materials physics Institute of Solid State Physics Hefei Institutes of Physical Science(HFIPS)Chinese Academy of Sciences Science Island Branch Graduate School of University of Science and Technology of China Center for High Pressure Science and Technology Advanced research Shanghai Key Laboratory of Material Frontiers research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS) State Key Laboratory of Superhard materials Institute of PhysicsJilin University College of materials Science&Engineering Beijing University of Technology

The recent report of room-temperature superconductivity at near-ambient pressure in nitrogen-doped lutetium hydride（Lu-H-N） by Dasenbrock-Gammon et al. [Nature 615, 244–250（2023）] has attracted tremendous attention due to its anticipated great impact on technology. However, the results could not be independently reproduced by other groups worldwide in follow-up studies, which elicited intense controversy. Here, we develop a reliable experimental protocol to minimize the extensively concerned extrinsic influences on the sample by starting the reaction from pure lutetium loaded with an H2/N2gas mixture in a diamond anvil cell under different pressures and temperatures and simultaneously monitoring the entire chemical reaction process using in situ four-probe resistance measurements. Therefore, we could repeatedly reproduce the near-room temperature upsurge of electrical resistance at a relatively early stage of the chemical reaction. However, the mechanism is suggested to be a metal-to-semiconductor/insulator transition associated with the structural modulation in the non-stoichiometric Lu-H-N, rather than superconductivity.

关键词： superconductivity high pressure lutetium hydride resistance transition metal-to-semiconductor/insulator transition

Role of bonding filling on HER/OER/ORR multifunctional catalytic activity in transition-metals-doped PdPX(X=S,Se,Te)

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Rare Metals 2024年第10期43卷 5126-5140页

作者： Hai-Hua Huang Wei Li Cheng-Chao Hu Xue-Qin Sun Lin-Guo Lu Xiao-Feng Fan School of materials Science and Engineering Laboratory of Sensitive Materials and DevicesShandong Department of EducationLiaocheng University School of Environmental and Material Engineering Yantai University department of physics University of Puerto Rico Key Laboratory of Automobile materials (Jilin University) Ministry of EducationCollege of Materials Science and EngineeringJilin University

The development of stable and highly efficien multifunctional electrocatalysts for the hydrogen evolution reaction （HER）,oxygen reduction reaction （ORR） and oxygen evolution reaction （OER） are essential for the efficient conversion and storage of renewable *** significant advantages of single-atom catalysts,such as strong metal slab interactions,unsaturated coordination and efficient atomic utilization,have opened new avenues for designing multifunctional ***,based on density functional theory,a single atom doped PdPX system was designed as a multifunctional electrocatalyst,which demonstrated the synergistic effect between defects and transition metal atoms and led to enhanced catalytic *** results showed that PdPS/PdPSe with P/X vacancy,PdPTe with P/Pd vacancy and Co/Rh/Ir@PdPX exhibited promising HER ***@PdPS（Se）,with an overpotential of 0.56（0.44） V,was predicted to be a promising OER ***,Rh（Ir）@PdPS（Se）catalysts exhibited efficient catalytic properties for ORR Besides,Co@PdPS（Se）,Rh（Ir）@PdPSV（S）,Co@PdP-SeV（Se）and Ir@PdPSV（S）-1exihibited multifunctional catalytic performance with moderate ***,the origin of catalytic activity was revealed by using the crystal orbital Hamilton populations *** a strong adsorption system,proper filling of the anti-bonding state can increase the energy of the system,weaken the adsorption strength,and facilitate the desorption of intermediates Conversely,augmenting bonding states can enhance its adsorption *** findings provide theoretica guidance for the design and fabrication of novel multifunctional electrocatalysts in terms of filling of bondingstate.

关键词： Density functional theory Electrocatalyst Two-dimensional PdPX Water splitting

Conceptual transition from molecular to atomic: unleashing a new era in hydrogen therapy for chronic disease

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National Science Review 2024年第4期11卷 17-18页

作者： Zhigang Zou Eco-materials and Renewable Energy research Center (ERERC) Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State Microstructures and Department of PhysicsNanjing University

The dysregulated overexpression of reactive oxygen and nitrogen species (RONS)intricately links to the occurrence and development of diverse chronic diseases[1–3]. Hydrogen therapy stands out as a promising treatment methodology recognized for effectively mitigating RONS and maintaining intracellular redox equilibrium, thereby yielding therapeutic benefits [4,5].

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Ferromagnetism and insulating behavior with a logarithmic temperature dependence of resistivity in Pb_(10-x)Cux(PO_(4))_(6)O

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Science China(physics,Mechanics & Astronomy) 2024年第1期67卷 106-111页

作者： Yuhang Zhang Cong Liu Xiyu Zhu Hai-Hu Wen Center for Superconducting physics and materials National Laboratory of Solid State Microstructures and Department of PhysicsNational Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Recent claim of discovering above-room-temperature superconductivity(Tc≈400 K)at ambient pressure in copper doped apatite Pb10(PO_(4))_(6)O has stimulated world-wide enthusiasm and impulse of motion.A lot of follow-up works have been carried out with controversial *** check whether superconductivity is really present or absent in the material,we need samples which should have a rather pure phase of Pb_(10-x)Cux(PO_(4))_(6)*** we report the characterization results from the Pb_(10-x)Cux(PO_(4))_(6)O with a fraction of about 97 wt.%inferred from the fitting to the X-ray diffraction pattern,if assuming Cu2S as the only *** resistivity measurements show that it is a semiconductor characterized roughly by a ln(1/T)temperature dependence in wide temperature region without trace of *** measurements show that it has a general ferromagnetic signal with a weak superparamagnetic *** grains of the sample show clear interactions with a Nb Fe B *** detected Cu concentration is much lower than the expected nominal *** results show the absence of metallicity and superconductivity in Pb_(10-x)Cux(PO_(4))_(6)O at ambient pressure,and suggest the presence of strong correlation effect.

关键词： superconductivity Pb10(PO4)6O ferromagnetic correlation effect

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Recent Advances in Asymmetric Structural Composites for Excellent Electromagnetic Interference Shielding: A Review

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Chinese Journal of Polymer Science 2024年第6期42卷 693-710页

作者： Ying Zhou Bai Xue Lan Xie Chang-Mei Wu Qiang Zheng department of Polymer materials and Engineering College of Materials and Metallurgy Guizhou University National Engineering research Center for Compounding and Modification of Polymer materials National and Local Joint Engineering Research Center for Functional Polymer Membrane Materials and Membrane Processes State Key Laboratory of Public Big Data Guizhou University department of Polymer Science and Engineering Zhejiang University

Since electromagnetic pollution is detrimental to human health and the environment, numerous efforts have been successively made to achieve excellent electromagnetic interference shielding effectiveness(EMI SE) via designing the hierarchical structures for electromagnetic interference(EMI) shielding polymer composites. Among the plentiful structures, the asymmetric structures are currently a hot spot, principally categorizing into multi-layered, porous, fibrous, and segregated asymmetric structures, which endows the high EMI shielding performance for polymer composites incorporated with magnetic, conductive, and/or dielectric micro/nano-fillers, due to the “absorption-reflection-reabsorption” shielding mechanism. Therefore, this review provides the retrospection and summary of the efforts with respect to abundant asymmetric structures and multifunctional micro/nano-fillers for enhancing EMI shielding properties, which is conducive to the booming development of polymeric EMI shielding materials for the promising prospect in modern electronics and 5-generation(5G) technology.

关键词： Asymmetric structure Microano functional filler Polymer composite Electromagnetic interference shielding

Cationic engineered nanodiamonds for efficient antibacterial surface with strong wear resistance

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Nano research 2024年第3期17卷 939-948页

作者： Fu-Kui Li Wen-Bo Zhao Yong Wang Wen-Tao Huang Ya-Lun Ku Hang Liu Rui Guo Hui-Hui Yu Kai-Kai Liu Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics&MicroelectronicsZhengzhou UniversityZhengzhou 450052China

The spread of diseases caused by bacterial adhesion and immobilization in public places constitutes a serious threat to public *** of bacteria spread by the construction of an antibacterial surface takes precedence over post-infection ***,we demonstrate an effective antibacterial surface with strong wear resistance by constructing cationic engineered nanodiamonds(C-NDs).The C-NDs with positive surface potentials interact effectively with bacteria through electrostatic interactions,where the C-NDs act on the phospholipid bilayer and lead to bacterial membrane collapse and rupture through hydrogen bonding and residual surface oxygen-containing reactive *** this case,bactericidal rate of 99.99%and bacterial biofilm inhibition rate of more than 80%can be achieved with the C-NDs concentration of 1 mg/*** addition,the C-NDs show outstanding antibacterial stability,retaining over 87%of the antibacterial effect after stimulation by adverse environments of heat,acid,and external ***,an antibacterial surface with high wear resistance obtained by integrating C-NDs with commercial plastics has been *** antibacterial surface with a mass fraction of 1 wt.%C-NDs improved abrasion resistance by 3981 times,with 99%killing of adherent *** work provides an effective strategy for highly efficient antibacterial wear-resistant surface,showing great practical applications in public health environments.

关键词： antibacterial surface cationic engineered nanodiamonds wear-resistant

Quantum confinement of carriers in the type-I quantum wells structure

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Chinese physics B 2024年第9期33卷 553-558页

作者： Xinxin Li Zhen Deng Yang Jiang Chunhua Du Haiqiang Jia Wenxin Wang Hong Chen Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials andDevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChineseAcademy of SciencesBeijing 100190China Center of materials and Optoelectronics Engineering University of Chinese Academy ofSciencesBeijing 100049China The Yangtze River Delta physics research Center Liyang 213000China Songshan Lake materials Laboratory Dongguan 523808China

Quantum confinement is recognized to be an inherent property in low-dimensional ***,it is believed that the carriers trapped within the well cannot escape due to the discrete energy ***,our previous research has revealed efficient carrier escape in low-dimensional structures,contradicting this conventional *** this study,we review the energy band structure of quantum wells along the growth direction considering it as a superposition of the bulk material dispersion and quantization energy dispersion resulting from the quantum confinement across the whole Brillouin *** accounting for all wave vectors,we obtain a certain distribution of carrier energy at each quantized energy level,giving rise to the energy *** results enable carriers to escape from the well under the influence of an electric ***,we have compiled a comprehensive summary of various energy band scenarios in quantum well structures relevant to carrier *** a new interpretation holds significant value in deepening our comprehension of low-dimensional energy bands,discovering new physical phenomena,and designing novel devices with superior performance.

关键词： energy band quantum confinement type-I quantum wells low-dimensional structures

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High-Quality van der Waals Epitaxial CsPbBr3 Film Grown on Monolayer Graphene Covered TiO2 for High-Performance Solar Cells

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Energy & Environmental materials 2024年第4期7卷 239-246页

作者： Zhaorui Wen Chao Liang Shengwen Li Gang Wang Bingchen He Hao Gu Junpeng Xie Hui Pan Zhenhuang Su Xingyu Gao Guo Hong Shi Chen Institute of Applied physics and materials Engineering University of Macau MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter State Key Laboratory for Mechanical Behavior of Materials School of Physics Xi'an Jiaotong University Shanghai Institute of Applied physics Chinese Academy of Sciences department of materials Science and Engineering & Center of Super-Diamond and Advanced Films City University of Hong Kong

Two-dimensional materials have been widely used to tune the growth and energy-level alignment of ***,their incomplete passivation and chaotic usage amounts are not conducive to the preparation of highquality perovskite ***,we succeeded in obtaining higher-quality CsPbBr3films by introducing large-area monolayer graphene as a stable physical overlay on top of TiO2substrates.

关键词： all-inorganic perovskite solar cells buried interface modification monolayer graphene van der Waals epitaxial growth