检索结果-内蒙古大学图书馆

Stability and low-energy orientations of interphase boundaries in multiaxial ferroelectrics: Phase-field simulations

引用

Physical Review B 2022年第1期105卷 014108-014108页

作者： Yang Zhang Fei Xue Bo Wang Jia-Mian Hu Shuai Dong Jun-Ming Liu Long-Qing Chen School of Physics Southeast University Nanjing 211189 China Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802 USA Department of Materials Science and Engineering University of Wisconsin-Madison Madison Wisconsin 53706 USA

The coexistence of different ferroelectric phases enables the tunability of the macroscopic properties and extensive applications from piezoelectric transducers to nonvolatile memories. Here we develop a thermodynamic model to predict the stability and low-energy orientations of boundaries between different phases in ferroelectrics. Taking lead zirconate titanate and bismuth ferrite as two examples, we demonstrate that the low-energy orientations of interphase boundaries are largely determined by minimizing the electrostatic and elastic energies. Phase-field simulations are employed to analyze the competition between the interfacial energy and the electrostatic and elastic energies. Our simulation results demonstrate that the lowering of crystal symmetry could occur due to the electrical and mechanical incompatibilities between the two phases, which can be used to explain the experimentally observed low-symmetry phases near morphotropic phase boundaries. Our work provides theoretical foundations for understanding and controlling the interphase boundaries in ferroelectric materials for multifunctional applications.

关键词： Domain walls Ferroelectric domains Thermodynamics Ferroelectrics Phase-field modeling

来源：评论

学校读者我要写书评

暂无评论

Significant photothermoelectric effect of topological semimetals at infrared bands

引用

Physical Review Applied 2025年第3期23卷 034077-034077页

作者： Cheng-Hao Yin Hong-Tao Jiang Yang-Yang Lv Shu-Hua Yao Jian Zhou 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 Jiangsu Key Laboratory of Artificial Functional Materials & Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology Wuhan 430205 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

We theoretically explore the photothermoelectric effect (PTE) of topological semimetals using the static two-temperature model. The interaction between the Dirac or Weyl fermions and electromagnetic waves is described by the dielectric constant in the model Hamilton of topological semimetals. Numerical calculations predict a significant PTE in the conventional plasmon mode with infrared bands of both the Dirac and Weyl semimetals. In addition to the PTE with a plasmon mode, the Weyl semimetals exhibit an enormous PTE at the frequencies of the two unconventional modes (helicon waves) in the infrared region. The helicon-wave modes originate from the resonant coupling between left- and right-circularly polarized electromagnetic waves and the helical motion of Weyl electron under an effective magnetic field induced by the Berry curvature. The frequencies of the helicon-wave modes depend on the carrier concentration, the Fermi velocity, and the distance between the positive and negative Weyl points in the Weyl semimetals, as well as the transport lifetime of the Weyl fermion. Using real parameters for the topological semimetals, we propose ideal materials for detecting the specific infrared bands of electromagnetic waves. This work strongly suggests that topological semimetals are promising for detecting electromagnetic waves in the infrared region, taking advantage of their significant PTE.

关键词： Helicons

来源：评论

学校读者我要写书评

暂无评论

Crystallographic Understanding of Photoelectric Properties for C_(60) Derivatives Applicable as Electron Transporting materials in Perovskite Solar Cells

引用

Chemical Research in Chinese Universities 2022年第1期38卷 75-81页

作者： XING Zhou LI Shu-Hui XU Piao-Yang TIAN Han-Rui DENG Lin-Long YAO Yang-Rong CHEN Bin-Wen XIE Fang-Fang AN Ming-Wei YUN Da-Qin XIE Su-Yuan ZHENG Lan-Sun State Key Lab for Physical Chemistry of Solid Surfaces iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005P.R.China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005P.R.China College of Energy Xiamen UniversityXiamen 361005P.R.China

Hundreds of C60 derivatives stand out as electrontransporting materials(ETMs), for example, in perovskite solar cells(PSCs), due to their properties on electron extraction or defect passivation. However, it still lacks of guidelines to update C60-based ETMs with excellent photoelectric properties. In this work, crystallographic data of eight C60-based ETMs, including pristine C60 and the well-known PCBM as well as six newly synthesized fullerenes, are analyzed to establish the connections between derivatized structures and photoelectric properties for the typical carbon cluster of C60. In terms of packing centroid-centroid distance between neighboring carbon cages, the crystallographic data are useful for probing photoelectric properties, such as electrochemical properties, electron mobility and photovoltaic performances, and therefore facilitate to design novel C60-based ETMs for PSCs with high performances.

关键词： Perovskite solar cell(PSC) Electron transporting material(ETM) Fullerene Power conversion efficiency Crystallographic understanding

来源：评论

学校读者我要写书评

暂无评论

Field-free switching of perpendicular magnetization by cooperation of planar Hall and orbital Hall effects

arXiv

引用

arXiv 2024年

作者： Bekele, Zelalem Abebe Jiang, Yuan-Yuan Lei, Kun Lan, Xiukai Liu, Xiangyu Wen, Hui Shao, Ding-Fu Wang, Kaiyou State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China

Spin-orbit torques (SOTs) generated through the conventional spin Hall effect and/or Rashba-Edelstein effect are promising for manipulating magnetization. However, this approach typically exhibits non-deterministic and inefficient behaviour when it comes to switching perpendicular ferromagnets. This limitation posed a challenge for write-in operations in high-density magnetic memory devices. Here, we determine an effective solution to overcome this challenge by simultaneously leveraging both a planar Hall effect (PHE) and an orbital Hall effect (OHE). Using a representative Co/PtGd/Mo trilayer SOT device, we demonstrate that the PHE of Co is enhanced by the interfacial coupling of Co/PtGd, giving rise to a finite out-of-plane damping-like torque within the Co layer. Simultaneously, the OHE in Mo layer induces a strong out-of-plane orbital current, significantly amplifying the in-plane damping-like torque through orbital-to-spin conversion. While either the PHE or OHE alone proves insufficient for reversing the perpendicular magnetization of Co, their collaborative action enables high-efficiency field-free deterministic switching. Our work provides a straightforward strategy to realize high-speed and low-power spintronics. © 2024, CC BY-NC-SA.

关键词： Damping

来源：评论

学校读者我要写书评

暂无评论

Single-Photon Advantage in Quantum Cryptography Beyond QKD

arXiv

引用

arXiv 2024年

作者： Vajner, Daniel A. Kaymazlar, Koray Drauschke, Fenja Rickert, Lucas Helversen, Martin V. Liu, Hanqing Li, Shulun Ni, Haiqiao Niu, Zhichuan Pappa, Anna Heindel, Tobias Institute of Solid State Physics Technical University of Berlin Berlin10623 Germany Electrical Engineering and Computer Science Department Technical University of Berlin Berlin10623 Germany Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

In quantum cryptography, fundamental laws of quantum physics are exploited to enhance the security of cryptographic tasks. Quantum key distribution is by far the most studied protocol to date, enabling the establishment of a secret key between trusted parties. However, there exist many practical use-cases in communication networks, which also involve parties in distrustful settings. The most fundamental quantum cryptographic building block in such a distrustful setting is quantum coin flipping, which provides an advantage compared to its classical equivalent. So far, few experimental studies on quantum coin flipping have been reported, all of which used probabilistic quantum light sources facing fundamental limitations. Here, we experimentally implement a quantum strong coin flipping protocol using single-photon states and demonstrate an advantage compared to both classical realizations and implementations using faint laser pulses. We achieve this by employing a state-of-the-art deterministic single-photon source based on the Purcell-enhanced emission of a semiconductor quantum dot in combination with fast polarization-state encoding with a quantum bit error ratio below 3%, required for the successful execution of the protocol. The reduced multi-photon emission yields a smaller bias of the coin flipping protocol compared to an attenuated laser implementation, both in simulations and in the experiment. By demonstrating a single-photon quantum advantage in a cryptographic primitive beyond QKD, our work represents a major advance towards the implementation of complex cryptographic tasks in a future quantum internet. © 2024, CC BY.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

Rapid Electrical-Current-Activated Sintering Achieves Robust Cladding with Uniform Nanocrystalline Grains

SSRN

引用

SSRN 2024年

作者： Zhao, Dechao Wang, Yihao Chen, Han Liu, Yujing Zhang, Junsong Ma, Litao Yang, Chunliang Cui, Yuchi Wang, Mingliang Geng, Jiwei Kong, Decheng Zhang, Xinyu Guo, Youjie Tang, Zijue Dan, Chengyi Man, Cheng Chen, Zhe Wang, Haowei Yamaguchi, Tomiko Ma, Evan Shanghai200240 China Institute of Metals China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials Joining Shandong University Jinan250061 China School of Materials Science and Engineering Ocean University of China Qingdao266100 China Department of Materials and Science Kyushu Institute of Technology Fukuoka804-8559 Japan Center for Alloy Innovation and Design State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi’an710049 China

Nanocrystalline (NC) metals possess high strength due to its extremely small grain size, but the strength-plasticity trade-off, poor thermal stability, and limitation to a few micrometers in size have seriously hampered their widespread application for a long time. Here, we propose a universal and facile strategy to solve these problems all at once, by exploiting the synergistic aspect of rapid electrical-current-activated sintering (RECAS) and multi-component NC alloy. We demonstrate RECAS as an efficient way to achieve dense and robust claddings versatile in dimensions (i.e., ≥1 mm in thickness), also with uniform NC grain sizes. The NC CoCrNi medium-entropy alloy cladding is used to demonstrate the simultaneous realization of excellent strength-plasticity combination, and unprecedented high thermal stability of NC grain size up to ~0.84Tm (Tm, melting point), and the robust performance in terms of resistance to wear, corrosion and cavitation erosion. These advances open an avenue to a much-expanded repertoire of available parts made of NC metals/alloys (including their size, shape and composition), as well as an increased flexibility with regard to property combinations that extend application possibilities. © 2024, The Authors. All rights reserved.

关键词： Thermodynamic stability

来源：评论

学校读者我要写书评

暂无评论

Liquid gating membrane

引用

National science Review 2020年第1期7卷 9-11页

作者： Xu Hou College of Chemistry and Chemical Engineering & College of Physical Science and Technology & Collaborative Innovation Center of Chemistry for Energy Materials & State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University

The development of structural materials has brought impetus to every industrial revolution. The value and uses of structural materials follow primarily from their mechanical properties rather than their optical, electronic, magnetic or chemical properties. Conventionally thinking,structural materials are solid, with a fixed structure and good stability, which could include the materials response to an applied force. However, the notion

关键词： Liquid gating membrane

来源：评论

学校读者我要写书评

暂无评论

Anomalous nonequilibrium phonon scattering in the Weyl semimetal WP2

引用

Physical Review Research 2023年第2期5卷 023137-023137页

作者： Junhong Yu Jianzhou Zhao Yangyang Lv Yadong Han Zhang Hang Jinlong Xu Jianbo Hu Laboratory for Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900 China Co-Innovation Center for New Energetic Materials Southwest University of Science and Technology Mianyang 621010 China National Laboratory of Solid State Microstructures School of Electronic Science and Engineering School of Physics Nanjing University Nanjing 210093 China State Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and Technology Mianyang 621010 China

The type-II Weyl semimetal (WSM) β-WP2 was recently demonstrated as a supreme quantum material with various interestingtransport properties. Toward deciphering these peculiar transport phenomena for future topological device applications, it is highly necessary to understand the dynamical process of phonon scatterings under nonequilibrium conditions. By performing temperature-dependent coherent phonon spectroscopy in β-WP2, we provide here direct experimental evidence that phonons decaying into electron-hole pairs overwhelm the anharmonic phonon-phonon scattering process. Remarkably, the dominating phonon-electron coupling in β-WP2 is further supported by observations of the transient Fano resonance. First-principles calculations suggest that the anomalous phonon decaying results from the acoustic bunching and the limited phonon density of states in β-WP2. Our real-time observations provide dynamical insight into quasiparticle scatterings that are of vital importance for fundamental transport properties in β-WP2.

关键词： Anharmonic lattice dynamics Optical phonons Phonons Weyl semimetal Density functional calculations Optical absorption spectroscopy Photoexcitation Time-resolved light scattering spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Observation of the Pinning-Induced Crystal-Hexatic-Glass Transition in Two-Dimensional Colloidal Suspensions

引用

Chinese Physics Letters 2021年第10期38卷 17-21页

作者： Xiaoyan Sun Huaguang Wang Hao Feng Zexin Zhang Yuqiang Ma Department of Optoelectronics and Energy Engineering City College of SuzhouSuzhou 215104China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou 215006China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China

Identification of the glass formation process in various conditions is of importance for fundamental understanding of the mechanism of glass transitions as well as for developments and applications of glassy *** investigate the role of pinning in driving the transformation of crystal into glass in two-dimensional colloidal suspensions of monodisperse *** pinning is produced by immobilizing a fraction of microspheres on the substrate of sample cells where the mobile microspheres ***,the crystal-hexatic-glass transition occurs with increasing the number fraction of pinningρpinning,and the orientational correlation exhibits a change from quasi-long-range to short-range order atρpinning=***,the dynamics shows a nonmonotonic change with increasing the fraction of *** is due to the competition between the disorder that enhances the dynamics and the pinning that hinders the particle *** work highlights the important role of the pinning on the colloidal glass transition,which not only provides a new strategy to prevent crystallization forming glass,but also is helpful for understanding of the vitrification in colloidal systems.

关键词： materials crystal Transition

来源：评论

学校读者我要写书评

暂无评论

Non-Ergodic-Induced Negative Differential Piezoresponse in Relaxor Ferroelectrics

arXiv

引用

arXiv 2024年

作者： Saguy, Cecile Kowalski, Benjamin Sehirlioglu, Alp Ivry, Yachin Solid State Institute Technion−Israel Institute of Technology Haifa3200003 Israel NASA Glenn Research Center ClevelandOH44135 United States Department of Material Science and Engineering Case Western Reserve University ClevelandOH44106 United States Department of Materials Science and Engineering Solid State Institute Technion−Israel Institute of Technology Haifa3200003 Israel Technion – Israel Institute of Technology Haifa3200003 Israel

Relaxor ferroelectrics exhibit a unique competition between long-range and short-range interactions that can be tuned electrically which prioritizes these materials in a broad range of electro-mechanical energy-conversion technologies, including biomedical imaging and electric-charge generators. Here, we demonstrate differential negative piezoresponse by utilizing the short-range interactions in relaxor ferroelectrics. The effect was observed over a broad temperature range with local piezoresponse spectroscopy in unpoled samples, while no negative piezoresponse was observed when the material was pre-scan poled. These measurements suggest that the effect, that is promising for power-generation applications, originates from non-ergodic behavior. Complementary macroscale impedance and dielectric constant measurements as a function of temperature and frequency supported the mesoscopic findings. Bearing in mind the direct relationship between piezoresponse and capacitance, relaxor ferroelectrics appear as an excellent platform for the emerging technology of low-power negative-capacitance transistors. Copyright © 2024, The Authors. All rights reserved.

关键词： Capacitance

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：