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arXiv 2023年

作者： Chen, Zhao-Xian Ma, Ling-Ling Ge, Shi-Jun Chen, Ze-Guo Lu, Yan-Qing College of Engineering and Applied Sciences Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State Microstructures Nanjing University Nanjing210023 China School of Materials Science and Intelligent Engineering Nanjing University Suzhou215163 China

In quantum logic operations, information is carried by the wavefunction rather than the energy distribution. Therefore, the relative phase is essential. Abelian and non-Abelian phases can be emulated in classical waves using passive coupled waveguides with geometric modulation. However, the dynamic phases interference induced by waveguide structure variation is inevitable. To overcome the challenges, we introduce an electroacoustic coupled system that enables the precise control of phase distribution through dynamic modulation of hopping. Such effective hopping is electronically controlled and is utilized to construct various paths in parameter space. These paths lead to state evolution with matrix-valued geometric phases, which correspond to logic operations. We report experimental realizations of several logic operations, including Y gate, Z gate, Hadamard gate and non-Abelian braiding. Our work introduces a temporal process to manipulate transient modes in a compact structure, providing a versatile experimental testbed for exploring other logic gates and exotic topological phenomena. Copyright © 2023, The Authors. All rights reserved.

关键词： Computer circuits

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Propagation and migration of the plastic deformation band to increase ductility in Al-Mg alloys

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materials Today Communications 2025年 46卷

作者： Mu, Zhuangwei Hao, Shengwang Wang, Jiushuai School of Civil Engineering and Mechanics Yanshan University Qinhuangdao066004 China Hebei Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste Yanshan University Qinhuangdao066004 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

Plastic deformation localization resulting from the Portevin–Le Chatelier (PLC) effect significantly decreases the ductility of metal alloys. However, the relationship between the mechanical properties and the evolution of the PLC band remains unclear. This study demonstrates that the ductility of Al-Mg alloys has a linear relationship with the number of repetitive strain jump events at local positions. The obtained results indicate that the ductility of a Al-Mg alloy increases with an increasing number of jumps in the local strain. The large strain jump events in a localized zone consist of a series of consecutive unstable strain growth events. For example, serration of the traction load is a response to several unstable events that simultaneously occur in different positions through which the PLC band passes. Appearance of the PLC band was found to correlate with a large jump event in the strain increase of the localized zone. These findings suggest that the re-strengthening of localized zones and a spatial heterogeneity of strength distributions represent the underlying mechanisms responsible for the propagation and migration of PLC bands. These results provide guidance for improving the ductility of alloys by enhancing the propagation and migration of the PLC band. © 2025 Elsevier Ltd

关键词： Binary alloys

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Crystal structure and catalytic mechanism of the MbnBC holoenzyme required for methanobactin biosynthesis

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细胞研究（英文版） 2022年第3期32卷 302-314页

作者： Chao Dou Zhaolin Long Shoujie Li Dan Zhou Ying Jin Li Zhang Xuan Zhang Yanhui Zheng Lin Li Xiaofeng Zhu Zheng Liu Siyu He Weizhu Yan Lulu Yang Jie Xiong Xianghui Fu Shiqian Qi Haiyan Ren She Chen Lunzhi Dai Binju Wang Wei Cheng Division of Respiratory and Critical Care Medicine Respiratory Infection and Intervention Laboratory of Frontiers Science Center for Disease-related Molecular NetworkState Key Laboratory of BiotherapyWest China Hospital of Sichuan UniversityChengduSichuanChina State Key Laboratory of Structural Chemistry of Solid Surface and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujianChina National Institute of Biological Sciences NIBSBeijingChina Division of Respiratory and Critical Care Medicine Respiratory Infection and Intervention Laboratory of Frontiers Science Center for Disease-related Molecular NetworkState Key Laboratory of BiotherapyWest China Hospital of Sichuan UniversityChengduSichuanChina College of Life Science Sichuan UniversityChengduSichuanChina Beijing National Laboratory for Molecular Sciences(BNLMS) Beijing Key Laboratory for Magnetoelectric Materials and DevicesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijingChina

Methanobactins(Mbns)are a family of copper-binding peptides involved in copper uptake by methanotrophs,and are potential therapeutic agents for treating diseases characterized by disordered copper *** are produced via modification of MbnA precursor peptides at cysteine residues catalyzed by the core biosynthetic machinery containing MbnB,an iron-dependent enzyme,and ***,mechanistic details underlying the catalysis of the MbnBC holoenzyme remain ***,we present crystal structures of MbnABC complexes from two distinct species,revealing that the leader peptide of the substrate MbnA binds MbnC for recruitment of the MbnBC holoenzyme,while the core peptide of MbnA resides in the catalytic cavity created by the MbnB-MbnC interaction which harbors a unique tri-iron *** of the substrate sulfhydryl group to the tri-iron center achieves a dioxygen-dependent reaction for oxazolone-thioamide *** analysis of the MbnABC complexes together with functional investigation of MbnB variants identified a conserved catalytic aspartate residue as a general base required for MbnBC-mediated MbnA ***,our study reveals the similar architecture and function of MbnBC complexes from different species,demonstrating an evolutionarily conserved catalytic mechanism of the MbnBC holoenzymes.

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A novel stiff (TiC0.3N0.7) network toughened Si3N4 composites

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Ceramics International 2025年

作者： Nie, Baokuo Ren, Zhongkan Zhang, Lizhi Tang, Huaguo Yu, Yuan Wang, Lujie Li, Tongyang Qiao, Zhuhui State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100039 China Shandong Laboratory of Yantai Advanced Materials and Green Manufacture Yantai264006 China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Yantai264006 China Qingdao Center of Resource Chemistry & New Materials Qingdao266100 China

In composites, cracks propagation could be blocked by the second phase with higher modulus. Constructing a continuous network of the stiffer phase to block and deflect the cracks is anticipated to enhance fracture toughness. Herein, we prepared a series of 3D network-structured Si3N4-TiC0.3N0.7 ceramic composites by suspension-coating TiC particles (40 nm) on Si3N4 microspheres (75 μm). Contrary to conventional strong/weak interface (nacre‐like) models, constructing a strong/stronger interface with modulus gradients may enhance the fracture resistance and load-bearing capability of the composites. The optimized fracture toughness of 10.04 MPa m1/2 and significantly rising R-curve (SENB method) both demonstrate the excellent toughening effect of TiC0.3N0.7 networks. The mechanical properties and damage tolerance of sintered composites were evaluated as a function of TiC content. Two distinct crack propagation modes were identified through analysis of surface cracks and fracture morphology. © 2025

关键词： Fracture toughness

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Evolution of magnetotransport properties of Weyl semiconductor Te crystals with different Fermi energy

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Physical Review B 2023年第19期108卷 195121-195121页

作者： Cheng-Hao Yin Hong-Wei Fang Hong-Tao Jiang Lin Cao Shuang Han Yang-Yang Lv Jian Zhou Shu-Hua Yao Z. K. Liu Y. B. Chen Yan-Feng Chen National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China Department of Physics Nanjing University Nanjing 210093 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

The Weyl semiconductor is a type of semiconductor material that exhibits unique electronic properties. Tellurium (Te) is a recently discovered quantum material that exhibits quasilinear electronic dispersion, as opposed to the linear dispersion commonly observed in conventional Weyl semimetals. Its electrical- and magnetotransport properties, especially in Te crystals with different Fermi energy, have not been thoroughly investigated in prior studies. Here we successfully grew a series of Te crystals with varied Fermi energy through different temperature-cooling rates in the self-flux method, whose hole concentration can be adjusted from 1015cm−3 to 1016cm−3. In the case of low hole-concentration (1015 cm−3) Te crystals, temperature-dependent resistance shows abstract semiconductor-metal-semiconductor transition behavior with temperature varied. However, in the case of high carrier concentration, it demonstrates a transition from a semiconductor to a metallic state at a temperature T (T∼50K). Remarkably, the magnetoresistance (MR), under paralleled electric (E) and magnetic (B) fields (E∥B), evolves from dominant weak-antilocalization behavior in low hole-concentration samples to coexistence of weak-localization and chiral-anomaly effect in high hole-concentration ones. The dependences of coefficient CW of chiral anomaly in Te crystals with different Fermi energy on misaligned angle θ between E and B, and T, were systematically analyzed. The band structure of Te and the presence of an electronic band tail resulting from high hole-concentration doping were verified using angle-resolved photoemission spectroscopy. This study quantitatively discusses the complex magnetotransport evolution of Te crystals with varying Fermi energy. The analysis is based on the impurity band and Berry curvature of Weyl points within this system. The research conducted contributes to the advancement of knowledge regarding the transport properties exhibited by Weyl semiconductors.

关键词： Crystal phenomena Electrical properties Electronic structure Magnetotransport Single crystal materials Topological materials Anderson impurity model Angle-resolved photoemission spectroscopy Crystal growth Density functional theory Drude model Energy-dispersive x-ray spectroscopy First-principles calculations Transport techniques X-ray diffraction

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Layer-dependent electromechanical response in twisted graphene moiré superlattices

arXiv

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arXiv 2024年

作者： Zhang, Hanhao Wei, Yuanhao Li, Yuhao Lin, Shengsheng Wang, Jiarui Taniguchi, Takashi Watanabe, Kenji Li, Jiangyu Shi, Yi Wang, Xinran Shi, Yan Fei, Zaiyao National Laboratory of Solid-State Microstructures School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Jiangsu Nanjing210093 China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Jiangsu Nanjing210016 China National Key Laboratory of Spintronics Nanjing University Suzhou215163 China Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Guangdong Provisional Key Laboratory of Functional Oxide Materials and Devices Department of Materials Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China School of Integrated Circuits Nanjing University Jiangsu Suzhou215163 China Suzhou Laboratory Jiangsu Suzhou215123 China

The coupling of mechanical deformation and electrical stimuli at the nanoscale has been a subject of intense investigation in the realm of materials science. Recently, twisted van der Waals (vdW) materials have emerged as a platform for exploring exotic quantum states. These states are intimately tied to the formation of moiré superlattices, which can be visualized directly exploiting the electromechanical response. However, the origin of the response, even in twisted bilayer graphene (tBLG), remains unsettled. Here, employing lateral piezoresponse force microscopy (LPFM), we investigate the electromechanical responses of marginally twisted graphene moiré superlattices with different layer thicknesses. We observe distinct LPFM amplitudes and spatial profiles in tBLG and twisted monolayer-bilayer graphene (tMBG), exhibiting effective in-plane piezoelectric coefficients of 0.05 pm/V and 0.35 pm/V, respectively. Force tuning experiments further underscore a marked divergence in their responses. The contrasting behaviors suggest different electromechanical couplings in tBLG and tMBG. In tBLG, the response near the domain walls is attributed to the flexoelectric effect, while in tMBG, the behaviors can be comprehended within the context of piezoelectric effect. Our results not only provide insights into electromechanical and corporative effects in twisted vdW materials with different stacking symmetries, but may also offer a way to engineer them at the nanoscale. © 2024, CC BY.

关键词： Monolayers

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Plasmonic evolution of atomically size-selected Au clusters by electron energy loss spectrum

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National science Review 2021年第12期8卷 20-28页

作者： Siqi Lu Lin Xie Kang Lai Runkun Chen Lu Cao Kuojuei Hu Xuefeng Wang Jinsen Han Xiangang Wan Jianguo Wan Qing Dai Fengqi Song Jiaqing He Jiayu Dai Jianing Chen Zhenlin Wang Guanghou Wang National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and School of PhysicsNanjing University Department of Physics Southern University of Science and Technology Department of Physics National University of Defense Technology Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics School of Physical Sciences University of Chinese Academy of Sciences School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures Nanjing University Division of Nanophotonics CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Songshan Lake Materials Laboratory

The plasmonic response of gold clusters with atom number(N) = 100–70 000 was investigated using scanning transmission electron microscopy-electron energy loss spectroscopy. For decreasing N, the bulk plasmon remains unchanged above N = 887 but then disappears, while the surface plasmon firstly redshifts from 2.4 to 2.3 e V above N = 887 before blueshifting towards 2.6 e V down to N = 300, and finally splitting into three fine features. The surface plasmon's excitation ratio is found to follow N0.669, which is essentially R2. An atomically precise evolution picture of plasmon physics is thus demonstrated according to three regimes: classical plasmon(N = 887–70 000), quantum confinement corrected plasmon(N = 300–887)and molecule related plasmon(N < 300).

关键词： atomically precise gold cluster plasmonic response electron energy loss spectroscopy full-scale evolution

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Tuning of paramagnetic and diamagnetic cavity photon excitations in a square array of quantum dots in a magnetic field

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Physical Review B 2024年第20期110卷 205301-205301页

作者： Vidar Gudmundsson Vram Mughnetsyan Hsi-Sheng Goan Jeng-Da Chai Nzar Rauf Abdullah Chi-Shung Tang Valeriu Moldoveanu Andrei Manolescu Science Institute University of Iceland Dunhaga 3 IS-107 Reykjavik Iceland Department of Solid State Physics Yerevan State University Alex Manoogian 1 0025 Yerevan Armenia Department of Physics and Center for Theoretical Physics National Taiwan University Taipei 106319 Taiwan Center for Quantum Science and Engineering National Taiwan University Taipei 106319 Taiwan Physics Division National Center for Theoretical Sciences Taipei 106319 Taiwan Physics Department College of Science University of Sulaimani Kurdistan Region Iraq Department of Mechanical Engineering National United University Miaoli 360302 Taiwan National Institute of Materials Physics PO Box MG-7 Bucharest-Magurele Romania Department of Engineering Reykjavík University Menntavegur 1 IS-102 Reykjavik Iceland

We employ a “real-time” excitation scheme to calculate the excitation spectra of a two-dimensional electron system in a square array of quantum dots placed in a circular cylindrical far-infrared photon cavity subjected to a perpendicular homogeneous external magnetic field. The Coulomb interaction of the electrons is handled via spin density functional theory and the para- and the diamagnetic parts of the electron-photon coupling are updated according to a configuration interaction method in each iteration of the density functional calculation. The results show that an excitation scheme built on using the symmetry of the lateral square superlattice of the dots and the cylindrical cavity produces both para- and diamagnetic resonance peaks with oscillator strengths that can be steered by the excitation pulse parameters. The excitation method breaks the conditions for the generalized Kohn theorem and allows for insight into the subband structure of the electron system and can be used both inside and outside the linear response regime.

关键词： Cavity quantum electrodynamics Quantum dots Two-dimensional electron system Density functional calculations

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Atomistic mechanisms of the initial oxidation of stepped Cu3Au(100)

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Physical Review B 2022年第7期105卷 075422-075422页

作者： Yaguang Zhu Dongxiang Wu Chaoran Li Xiao Tong J. Anibal Boscoboinik Jerzy T. Sadowski Guangwen Zhou Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York Binghamton New York 13902 USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton New York 11973 USA

Alloy oxidation is complex and involves several critical processes that lack understanding on the atomic level. Here, we report an atomistic picture of the initial-stage oxidation of stepped Cu3Au(100) using a combination of surface science tools and modeling to illuminate the microscopic processes underlying oxygen-adsorption-induced structural and compositional changes. Pristine Cu3Au(100) consists of wide CuAu-terminated terraces and narrow Cu-terminated terraces separated by monatomic steps. Counterintuitive to the common expectations of the adsorbate-induced surface segregation of the more reactive alloy component, our observations demonstrate that the oxygen adsorption leads to the exfoliation of the outermost CuAu layer, thereby exposing the inner Cu plane to O attack. This occurs via the oxygen-assisted abstraction of Au and Cu atoms from step edges and CuAu terraces, which generates many Cu adatoms aggregating into Cu clusters and Au adatoms dissolving into the bulk. The oxygen adsorption onto fourfold hollow sites of the exposed Cu plane results in nucleation and growth of the c(2×2)−O superstructure, which can be fit well by the Johnson-Mehl-Avrami-Kolmogorov theory with a site-saturated nucleation mechanism.

关键词： Surface & interfacial phenomena Alloys Surfaces Density functional theory Ion beam analysis Scanning tunneling microscopy X-ray photoelectron spectroscopy

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Methylcellulose-Functionalized Gallium-Based Liquid-Metal Nanoparticles as Water-Based Lubricant Additives

SSRN

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SSRN 2024年

作者： Cheng, Jun Cui, Yafei Guo, Jie Tan, Hui Zhu, Shengyu Yang, Jun State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264000 China

Ga-based liquid metal nanoparticles have been proven to be a novel high-performance additive for lubricants. In this study, methylcellulose was used to encapsulate Ga-based liquid metal by ultrasound to prepare a novel type of heterogeneous nano-particles (GLM-NPs/MC), which displays a clear core-shell structure with a particle size of about 270 nm. The results demonstrate that GLM-NPs/MC, as a water-based lubricant additive, exhibits good tribology properties, reducing the friction coefficient and wear rate of the 304 steel discs by 59 % and 40 % *** high dispersion and good stability of GLM-NPs/MC make them slowly enter into the worn surface to form a Ga-rich tribo-film. This study provides insights into the design of Ga-based liquid metal nanoparticles for lubrication applications. © 2024, The Authors. All rights reserved.

关键词： Liquid metals

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