检索结果-内蒙古大学图书馆

Modulating single-molecule charge transport through external stimulus

eScience 2023年第3期3卷 1-14页

作者： Qi Zou Jin Qiu Yaping Zang He Tian Latha Venkataraman Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences 100049BeijingChina Department of Applied Physics and Applied Mathematics and Department of Chemistry Columbia UniversityNew YorkNY 10027USA

Understanding and tuning charge transport over a single molecule is a fundamental topic in molecular ***-molecule junctions composed of individual molecules attached to two electrodes are the most common components built for single-molecule charge transport *** the past two decades,rapid technical and theoretical advances in single-molecule junctions have increased our understanding of the conductance properties and functions of molecular *** this perspective article,we introduce the basic principles of charge transport in single-molecule junctions,then give an overview of recent progress in modulating single-molecule transport through external stimuli such as electric field and potential,light,mechanical force,heat,and chemical ***,we discuss challenges and offer views on future developments in molecular electronics.

关键词： Molecular electronics Single-molecule junctions Charge transport External stimulus

来源：评论

学校读者我要写书评

暂无评论

Memristive feature and mechanism induced by laser-doping in defect-free 2D semiconductor materials

引用

Journal of Semiconductors 2024年第7期45卷 85-91页

作者： Xiaoshan Du Shu Wang Qiaoxuan Zhang Shengyao Chen Fengyou Yang Zhenzhou Liu Zhengwei Fan Lijun Ma Lei Wang Lena Du Zhongchang Wang Cong Wang Bing Chen Qian Liu College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao 266590China National Center for Nanoscience and Technology&University of Chinese Academy of Sciences Beijing 100190China Hebei University of Water Resources and Electric Engineering Electrical Automation Department Cangzhou 061001China The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Re-search Center on Liquid Crystal Pho-tonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China College of Mathematics and Physics Shandong Advanced Optoelectronic Materials and Technologies Engineering LaboratoryQingdao Uni-versity of Science and TechnologyQingdao 266061China Department of Physics Capital Normal UniversityBeijing 100048China Department of Advanced Materials and Computing International Iberian Nanotechnology Laboratory(INL)4715-330 BragaPortugal College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Memristors as non-volatile memory devices have gained numerous attentions owing to their advantages in storage,in-memory computing, synaptic applications, etc. In recent years, two-dimensional(2D) materials with moderate defects have been discovered to exist memristive feature. However, it is very difficult to obtain moderate defect degree in 2D materials, and studied on modulation means and mechanism becomes urgent and essential. In this work, we realized memristive feature with a bipolar switching and a configurable on/off ratio in a two-terminal MoS_(2) device(on/off ratio ~100), for the first time, from absent to present using laser-modulation to few-layer defect-free MoS_(2)(about 10 layers), and its retention time in both high resistance state and low resistance state can reach 2×10^(4) s. The mechanism of the laser-induced memristive feature has been cleared by dynamic Monte Carlo simulations and first-principles calculations. Furthermore, we verified the universality of the laser-modulation by investigating other 2D materials of TMDs. Our work will open a route to modulate and optimize the performance of 2D semiconductor memristive devices.

关键词： 2D-material memristor laser doping laser direct writing memristive mechanism

来源：评论

学校读者我要写书评

暂无评论

Polarization effect on molecular ionization and Rydberg-state excitation in laser fields

引用

Optics Express 2025年第10期33卷 21796-21806页

作者： Hu, Shilin Yi, Xiaopeng Guo, Li Li, Pengcheng Chen, Jing Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science Shantou University Guangdong Shantou515063 China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou University Guangdong Shantou515063 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing100088 China Department of Physics Shanghai Normal University Shanghai200234 China Department of Modern Physics Hefei National Research Center for Physical Sciences School of Physical Sciences University of Science and Technology of China Hefei230026 China Hefei National Laboratory Hefei230088 China

We have studied the impact of the dynamic core-electron polarization on molecular ionization and Rydberg-state excitation for CO molecules subjected to different laser pulses by numerically solving the three-dimensional time-dependent Schrödinger equations (TDSE) and semiclassical simulations. It is found that the ionization and the Rydberg-state excitation prefer to occur for the peak electric field pointing from C nucleus to O nucleus if the multielectron polarization effect is included, which are consistent with previous experimental observations. In addition, the electron tends to occupy the low-lying excited states after the occurrence of tunneling and the excitation yield increases relatively with respect to the ionization probability if the polarization effect is considered, and the above intriguing features are ascribed to the facts that the tunneling exit becomes closer to the core due to the polarization effect. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Schrodinger equation

来源：评论

学校读者我要写书评

暂无评论

Tuning 2D magnetism in Fe3+XGeTe2 films by element doping

引用

National Science Review 2022年第6期9卷 163-170页

作者： Shanshan Liu Zihan Li Ke Yang Enze Zhang Awadhesh Narayan Xiaoqian Zhang Jiayi Zhu Wenqing Liu Zhiming Liao Masaki Kudo Takaaki Toriyama Yunkun Yang Qiang Li Linfeng Ai Ce Huang Jiabao Sun Xiaojiao Guo Wenzhong Bao Qingsong Deng Yanhui Chen Lifeng Yin Jian Shen Xiaodong Han Syo Matsumura Jin Zou Yongbing Xu Xiaodong Xu Hua Wu Faxian Xiu State Key Laboratory of Surface Physics and Department of Physics Fudan University Institute for Nanoelectronic Devices and Quantum Computing Fudan University College of Science University of Shanghai for Science and Technology Laboratory for Computational Physical Sciences(MOE) Fudan University Solid State and Structural Chemistry Unit Indian Institute of Science School of Electronic Science and Engineering Nanjing University Department of Physics University of Washington Department of Electronic Engineering Royal Holloway University of London Materials Engineering The University of Queensland Beijing Key Laboratory of Microstructure and Property of Advanced Materials Institute of Microstructure and Property of Advanced Materials Beijing University of Technology The Ultramicroscopy Research Center Kyushu University State Key Laboratory of ASIC and System School of Microelectronics Fudan University Collaborative Innovation Center of Advanced Microstructures Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Centre for Microscopy and Microanalysis The University of Queensland Shanghai Research Center for Quantum Sciences

Two-dimensional（2D） ferromagnetic materials have been discovered with tunable magnetism and orbital-driven nodal-line features. Controlling the 2D magnetism in exfoliated nanoflakes via electric/magnetic fields enables a boosted Curie temperature（TC） or phase transitions. One of the challenges, however, is the realization of high TC2D magnets that are tunable, robust and suitable for large scale fabrication. Here, we report molecular-beam epitaxy growth of wafer-scale Fe3+XGeTe2films with TCabove room temperature. By controlling the Fe composition in Fe3+XGeTe2, a continuously modulated TCin a broad range of 185–320 K has been achieved. This widely tunable TCis attributed to the doped interlayer Fe that provides a 40% enhancement around the optimal composition X = 2. We further fabricated magnetic tunneling junction device arrays that exhibit clear tunneling signals. Our results show an effective and reliable approach, i.e. element doping, to producing robust and tunable ferromagnetism beyond room temperature in a large-scale 2D Fe3+XGeTe2fashion.

关键词： 2D ferromagnetic material Fe3+XGeTe2 film element doping above room temperature TC tunability

来源：评论

学校读者我要写书评

暂无评论

Quantum Distributed Algorithms for Approximate Steiner Trees and Directed Minimum Spanning Trees

Quantum Distributed Algorithms for Approximate Steiner Trees...

引用

Quantum computing and Engineering (QCE), IEEE International Conference on

作者： Phillip A. Kerger David E. Bernal Neira Zoe Gonzalez Izquierdo Eleanor G. Rieffel Department of Applied Mathematics and Statistics Johns Hopkins University Research Institute of Advanced Computer Science USRA Quantum Artificial Intelligence Laboratory NASA Ames Research Center

We present two algorithms in the Quantum CONGEST-CLIQUE model of distributed computation that succeed with high probability; one for producing an approximately optimal Steiner Tree, and one for producing an exact directed minimum spanning tree, each of which uses $\overline{O}(n^{1/4})$ rounds of communication and $\tilde{O}(n^{9/4})$ messages, achieving a lower asymptotic round and message complexity than any known algorithms in the classical CONGEST-CLIQUE model. At a high level, we achieve these results by combining classical algorithmic frameworks with quantum subroutines. Additionally, we characterize the constants and logarithmic factors involved in our algorithms as well as related classical algorithms, otherwise obscured by $\overline{O}$ notation, revealing that advances are needed to render both the quantum and classical algorithms practical.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Native spaces and generalization of Wu functions

引用

Science China mathematics 2025年

作者： Yixuan Huang Zongmin Wu Shengxin Zhu Laboratory of Mathematics and Complex Systems (Ministry of Education of China) School of Mathematical Sciences Beijing Normal University Shanghai Key Laboratory for Contemporary Applied Mathematics School of Mathematical Sciences Fudan University Shanghai Center for Mathematical Sciences School of Big Data and Statistics Anhui University Advanced Institute of Natural Science Beijing Normal University Guangdong Provincial Key Laboratory of Interdisciplinary Research and Application for Data Science Beijing Normal-Hong Kong Baptist University

Wu functions are a class of positive definite compactly supported radial basis functions in terms of piecewise polynomials. They are similar to Wendland functions that came up shortly later and they still require further investigation. Here, we prove that the native space of a Wu function is a dense subspace of a Sobolev space and give an explicit characterization of the native spaces of Wu functions. In addition, three definitions of Wu functions are introduced and proven to be equivalent. Based on these new equivalent definitions and the so-called f-form, we can generalize the Wu functions for the even-dimensional spaces, while the original Wu functions are proven to have odd maximal possible dimensions on which they are positive definite. Such functions in even-dimensional spaces will be called the “missing Wu functions”. Furthermore, we can generalize the Wu functions to “fractional”-dimensional spaces. We call all these Wu functions the generalized Wu functions. The closed form of the generalized Wu functions is given in terms of hypergeometric functions. Finally, we prove that the Wu functions and the missing Wu functions can be written as linear combinations of the generalized Wendland functions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Unraveling the reaction reversibility and structure stability of nickel sulfide anodes for lithium ion batteries

引用

Journal of Energy Chemistry 2023年第5期80卷 392-401,I0010页

作者： Yu Huang Chunyuan Liang Yueling Cai Yi Zhou Bingkun Guo Jipeng Cheng Heguang Liu Peng Wang Qianqian Li Anmin Nie Hongtao Wang Jinsong Wu Tongyi Zhang Materials Genome Institute Shanghai UniversityShanghai 200444China Center for X-mechanics Zhejiang UniversityHangzhou 310027ZhejiangChina School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027ZhejiangChina School of Materials Science and Engineering Xi'an University of TechnologyXi'an 048ShaanxChin Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004HebeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070HubeiChina

The electrochemical performance of lithium-ion batteries,*** capacity and cyclability,is primarily determined by chemical reversibility and structural stability of the electrodes in *** we have investigated the fundamental reaction behaviors of nickel sulfide(NixSy)as lithium-ion battery anodes by in-situ *** find that Ni_(3)S_(2)is the electrochemically stable phase,which appears in the first cycle of the *** the second cycle,conversion between Ni_(3)S_(2)and Li_(2)S/Ni is the dominant electrochemical *** lithiation,the NixSynanoparticles evolve into a mixture of Ni nanocrystals embedded in Li_(2)S matrix,which form a porous structure upon full lithiation,and with the recrystallization of the Ni_(3)S_(2)phase in delithiation,a compact and interconnected network is *** stability in cycles is susceptible to particle size and substrate *** substrate can certainly improve the tolerance for size-dependent pulverization of *** NixSynanoparticle exceeds the critical size value,the morphology of the particle is no longer well maintained even under the constraints of the carbon *** work deepens the understanding of electrochemical reaction behavior of conversiontype materials and helps to rational design of high-energy density battery anodes.

关键词： Nickel sulfide anodes Reaction reversility Structure rebuilding In-situ TEM Lithium-ion battery

来源：评论

学校读者我要写书评

暂无评论

Multi-phase-field simulation of austenite peritectic solidification based on a ferrite grain

引用

Chinese Physics B 2021年第1期30卷 572-577页

作者： Chao Yang Jing Wang Junsheng Wang Yu Liu Guomin Han Haifeng Song Houbing Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Software Center for High Performance Numerical Simulation China Academy of Engineering PhysicsBeijing 100088China

A multi-phase-field model is implemented to investigate the peritectic solidification of Fe-C alloy. The nucleation mode of austenite is based on the local driving force, and two different thicknesses of the primary austenite on the surface of the ferrite equiaxed crystal grain are used as the initial conditions. The simulation shows the multiple interactions of ferrite, austenite, and liquid phases, and the effects of carbon diffusion, which presents the non-equilibrium dynamic process during Fe-C peritectic solidification at the mesoscopic scale. This work not only reveals the influence of the austenite nucleation position, but also clarifies the formation mechanism of liquid phase channels and molten pools. Therefore, the present study contributes to the understanding of the micro-morphology and micro-segregation evolution mechanisms of Fe-C alloy during peritectic solidification.

关键词： multi-phase-field simulation morphology evolution peritectic solidification carbon diffusion Fe-C alloy

来源：评论

学校读者我要写书评

暂无评论

FAST-CONVERGENT TWO-LEVEL RESTRICTED ADDITIVE SCHWARZ METHODS BASED ON OPTIMAL LOCAL APPROXIMATION SPACES

arXiv

引用

arXiv 2024年

作者： Strehlow, Arne Ma, Chupeng Scheichl, Robert Institute for Applied Mathematics Interdisciplinary Center for Scientific Computing Heidelberg University Im Neuenheimer Feld 205 Heidelberg69120 Germany School of Sciences Great Bay University Dongguan523000 China Great Bay Institute for Advanced Study Dongguan523000 China

This paper proposes a two-level restricted additive Schwarz (RAS) method for multiscale PDEs, built on top of a multiscale spectral generalized finite element method (MS-GFEM). The method uses coarse spaces constructed from optimal local approximation spaces, which are based on local eigenproblems posed on (discrete) harmonic spaces. We rigorously prove that the method, used as an iterative solver or as a preconditioner for GMRES, converges at a rate of Λ, where Λ represents the error of the underlying MS-GFEM. The exponential convergence property of MS-GFEM, which is indepdendent of the fine mesh size h even for highly oscillatory and high contrast coefficients, thus guarantees convergence in a few iterations with a small coarse space. We develop the theory in an abstract framework, and demonstrate its generality by applying it to various elliptic problems with highly heterogeneous coefficients, including H(curl) elliptic problems. The performance of the proposed method is systematically evaluated and illustrated via applications to two and three dimensional heterogeneous PDEs, including challenging elasticity problems in realistic composite *** Codes 65F10, 65N22, 65N30, 65N55 Copyright © 2024, The Authors. All rights reserved.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Application of Sobol Sensitivity Analysis with Surrogate Model of Analytical Function 2

Application of Sobol Sensitivity Analysis with Surrogate Mod...

引用

2nd IEEE International Conference on Power, Electronics and Computer Applications, ICPECA 2022

作者： Wei, Haomin Wang, Jiajia Shan, Yuehui Guo, Zhangxia Ma, Jing North University of China College of Mechatronic Engineering Taiyuan China Beijing Jinghang Research Institute of Computing and Communication Innovation Center for Intelligent System on Recognition and Decision China Aerospace Science and Industry Corporation Applied Mathematics Research Center Beijing China Equipment Project Management Center of Equipment Development Department of the Military Commission Beijing China

ISBN: (纸本)9781665442763

The Sobol sensitivity analysis method enables identifying the sensitivity factors that significantly impact the output results of mathematical models from a large number of uncertainty factors and analyzing and measuring the degree of their impact and sensitivity on the output results. However, Sobol sensitivity analysis is challenging to perform due to the specific analytical functions of mathematical models in the industry that are difficult to obtain frequently. In this paper, the required functional relationship was fitted by combining heat transfer theory with Lasso regression for the relationship between the influence of temperature changes in a piece of equipment in an outdoor environment and external environmental factors, and a more satisfactory result was obtained by performing a sensitivity analysis in this way. The study results prove that this method could provide convenience for industrial tests and has application value. © 2022 IEEE.

关键词： Sensitivity analysis

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：