检索结果-内蒙古大学图书馆

Conference on Lasers and Electro-Optics (CLEO)

作者： Seamus O'Hara Joe Costello Qi Tian Qile Wu Ken West Loren Pfeiffer Mark Sherwin Liang Wu Department of Physics and Institute of Terahertz Science and Technology University of California Santa Barbara Santa Barbara CA Intelligence Community Post-Doctoral Research Fellowship Program Philadelphia PA Department of Physics University of Pennsylvania Philadelphia PA Department of Electrical and Computer Engineering Princeton University Princeton NJ

ISBN: (纸本)9798350369311

In this proceeding, we present polarization data of sidebands emitted from strongly driven quasiparticles, demonstrate the dependence of these data on various parameters of the external driving field, and describe the data using an analytical expression, dependent on driving field parameters and the effective Hamiltonian of the system. We propose using this method on spin-momentum locked systems, such as altermagnets, to observe and reconstruct sidebands which are influenced by the topology of individual bands.

关键词： Electro-optic effects Amplitude modulation Topology Interferometry

来源：评论

学校读者我要写书评

暂无评论

Synthesis and Characterization of MXene from MAX phase

引用

materials Today: Proceedings 2022年 58卷 714-716页

作者： Ghosh, Arijit Pal, Himangshu Das, Tanay Chatterjee, Somenath Das, Amalendu Department of Electrical and Electronics Engineering Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India Department of Electronics and Communication Engineering Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India Centre for Materials Science and Nanotechnology Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India Department of Electronics and Communication National Institute of Technology Durgapur713209 India Department of Physics Sikkim Manipal Institute of Technology Sikkim Manipal University Sikkim737136 India

In today's technology advancement dictates towards finding a new element for wide applications, starting from medicine to energy storage as well as other optoelectronics. A group of transition metals and aluminium or silicon chemically combine with carbon or nitrogen is known as MAX phase. A technique has been described here to eliminate aluminium from the MAX phase to form exfoliated layered structured MXene, which may create a potential role in the above mentioned applications. After successful synthesis of MXene was characterized using XRD to determine the crystallinity, SEM analysis for morphological study, EDAX for elemental analysis, and UV-Vis spectroscopy for optical band gap determination. © 2022

关键词： Aluminum

来源：评论

学校读者我要写书评

暂无评论

High-performance terahertz polarization filter based on the anti-resonant fiber

引用

Optik 2023年第1期288卷

作者： Liu, Qiang Sun, Guangrong Sun, Yudan Meng, Tongyu Mu, Haiwei Liu, Wei Ma, Chao Li, Wenjing Wang, Kaiyu Lv, Jingwei Chu, Paul K. Liu, Chao School of Physics and Electronic Engineering Northeast Petroleum University Daqing163318 China College of Mechanical and Electrical Engineering Daqing Normal University Daqing163712 China Leicester International Institute Dalian University of Technology Dalian124221 China Department of Physics Department of Materials Science and Engineering and Department of Biomedical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong

A novel terahertz polarization filter based on the anti-resonant fiber is designed and analyzed. The polarization extinction ratio (PER) is improved by using high-resistivity silicon (HRS) as the bulk material in conjunction with a double conjoined tube cladding structure. The effects of the structure and material of the anti-resonant fiber on the polarization filtering characteristics are analyzed by the finite element method. The PER of the anti-resonant fiber reaches 100 dB and the insertion loss of y-polarization fundamental mode (YPFM) is less than 0.66 dB at 1 THz when the anti-resonant fiber length is 5.58 cm. The bandwidth can be expanded by changing the fiber length and for a fiber length of 8 cm, the frequency bandwidth is 0.92–1.14 THz and the insertion loss is less than 3 dB. The polarization filter is demonstrated to deliver excellent performance in the terahertz frequency range and has large commercial potential in terahertz communication and biomedical spectroscopy. © 2023

关键词： Fibers

来源：评论

学校读者我要写书评

暂无评论

Magnetic dynamics of two-dimensional itinerant ferromagnet Fe_(3)GeTe_(2)

引用

Chinese physics B 2021年第9期30卷 506-512页

作者： Lijun Ni Zhendong Chen Wei Li Xianyang Lu Yu Yan Longlong Zhang Chunjie Yan Yang Chen Yaoyu Gu Yao Li Rong Zhang Ya Zhai Ronghua Liu Yi Yang Yongbing Xu Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Jiangsu Provincial Key Laboratory for Nanotechnology School of PhysicsNanjing UniversityNanjing 210093China Department of Physics Southeast UniversityNanjing 211189China York-Nanjing Joint Centre for Spintronics and NanoEngineering Department of Electronic EngineeringUniversity of YorkYork YO105DDUnited Kingdom Jiangsu Key Laboratory of Opto-Electronic Technology Center for Quantum Transport and Thermal Energy ScienceSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China

Among the layered two-dimensional ferromagnetic materials(2D FMs),due to a relatively high T_(C),the van der Waals(vdW)Fe_(3)GeTe_(2)(FGT)crystal is of great importance for investigating its distinct magnetic ***,we have carried out static and dynamic magnetization measurements of the FGT crystal with a Curie temperature TC≈204 *** M-H hysteresis loops with in-plane and out-of-plane orientations show that FGT has a strong perpendicular magnetic anisotropy with the easy axis along its ***,we have calculated the uniaxial magnetic anisotropy constant(K_(1))from the SQUID *** dynamic magnetic properties of FGT have been probed by utilizing the high sensitivity electron-spin-resonance(ESR)spectrometer at cryogenic *** on an approximation of single magnetic domain mode,the K_(1)and the effective damping constant(αeff)have also been determined from the out-of-plane angular dependence of ferromagnetic resonance(FMR)spectra obtained at the temperature range of 185 K to T_(C).We have found large magnetic damping with the effective damping constantαeff~0.58 along with a broad linewidth(ΔH_(pp)>1000 Oe at 9.48 GHz,H||c-axis).Our results provide useful dynamics information for the development of FGT-based spintronic devices.

关键词： two-dimensional ferromagnet ferromagnetic resonance magnetic anisotropy magnetic damping

来源：评论

学校读者我要写书评

暂无评论

Data-driven discovery of the governing equations for transport in heterogeneous media by symbolic regression and stochastic optimization

引用

Physical Review E 2023年第1期107卷 L013301-L013301页

作者： Jinwoo Im Felipe P. J. de Barros Sami Masri Muhammad Sahimi Robert M. Ziff Sonny Astani Department of Civil and Environmental Engineering University of Southern California Los Angeles California 90089 USA Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles California 90089-1211 USA Michigan Center for Theoretical Physics and Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 USA

With advances in instrumentation and the tremendous increase in computational power, vast amounts of data are becoming available for many complex phenomena in macroscopically heterogeneous media, particularly those that involve flow and transport processes, which are problems of fundamental interest that occur in a wide variety of physical systems. The absence of a length scale beyond which such systems can be considered as homogeneous implies that the traditional volume or ensemble averaging of the equations of continuum mechanics over the heterogeneity is no longer valid and, therefore, the issue of discovering the governing equations for flow and transport processes is an open question. We propose a data-driven approach that uses stochastic optimization and symbolic regression to discover the governing equations for flow and transport processes in heterogeneous media. The data could be experimental or obtained by microscopic simulation. As an example, we discover the governing equation for anomalous diffusion on the critical percolation cluster at the percolation threshold, which is in the form of a fractional partial differential equation, and agrees with what has been proposed previously.

关键词： Diffusion Percolation Stochastic inference Differential equations Diffusion & random walks Genetic algorithm

来源：评论

学校读者我要写书评

暂无评论

Probing the Optical Dynamics of Quantum Emitters in Hexagonal Boron Nitride

引用

PRX Quantum 2022年第3期3卷 030331-030331页

作者： Raj N. Patel David A. Hopper Jordan A. Gusdorff Mark E. Turiansky Tzu-Yung Huang Rebecca E. K. Fishman Benjamin Porat Chris G. Van de Walle Lee C. Bassett Quantum Engineering Laboratory Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Physics University of California Santa Barbara California 93106 USA Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104 USA Materials Department University of California Santa Barbara California 93106 USA

Hexagonal boron nitride is a van der Waals material that hosts visible-wavelength quantum emitters at room temperature. However, experimental identification of the quantum emitters’ electronic structure is lacking, and key details of their charge and spin properties remain unknown. Here, we probe the optical dynamics of quantum emitters in hexagonal boron nitride using photon emission correlation spectroscopy. Several quantum emitters exhibit ideal single-photon emission with noise-limited photon antibunching, g(2)(0)=0. The photoluminescence emission lineshapes are consistent with individual vibronic transitions. However, polarization-resolved excitation and emission suggests the role of multiple optical transitions, and photon emission correlation spectroscopy reveals complicated optical dynamics associated with excitation and relaxation through multiple electronic excited states. We compare the experimental results to quantitative optical dynamics simulations, develop electronic structure models that are consistent with the observations, and discuss the results in the context of ab initio theoretical calculations.

关键词： Color centers Photon statistics Quantum information architectures & platforms Quantum optics Single photon sources Fluorescence spectroscopy Time-resolved photoluminescence

来源：评论

学校读者我要写书评

暂无评论

Statistical Approach Based on the Stoner‒Wohlfarth Model for Switching Field in Misoriented Magnets Arrays

SSRN

引用

SSRN 2023年

作者： Lee, Donghyeon Han, Donghyeon Ippei, Suzuki Yukiko, Takahashi Park, Jungmin Kim, Sanghoon Department of Physics University of Ulsan Ulsan44610 Korea Republic of Materials Science and Engineering KAIST Daejeon34141 Korea Republic of Tsukuba305-0017 Japan Department of Physics KAIST Daejeon34141 Korea Republic of Japan

Stoner‒Wohlfarth model (S‒W model) is appreciate to explain the relationship between the external magnetic field and the magnetization reversal of a single magnetic domain. However, it is inappropriate for inhomogeneous magnetic films or bulk materials, such as granular and defective films, because the magnetization reversal of the films is affected by magnetic particles or grains which could have a different anisotropy for uniaxial magnetic anisotropy (UMA) of the films. In this paper, we propose a model based on the S‒W model to understand the magnetization switching behavior of magnetic films with misoriented grains. Our model considers the distribution effect of different anisotropies originating from magnetic defects or domains against the UMA of a magnetic thin film, and a Gaussian function is employed for the probability distribution of tilted anisotropy. Finally, we experimentally demonstrate that our model describes the magnetic switching behavior of a granular magnetic film (FePt-C) with perpendicular magnetic anisotropy. This study provides a new analytical method for the magnetization reversal in magnetic devices. © 2023, The Authors. All rights reserved.

关键词： Probability distributions

来源：评论

学校读者我要写书评

暂无评论

Analysis of Dirac exceptional points and their isospectral Hermitian counterparts

引用

Physical Review B 2023年第10期107卷 104106-104106页

作者： Jose H. D. Rivero Liang Feng Li Ge Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Physics and Astronomy College of Staten Island CUNY Staten Island New York 10314 USA The Graduate Center CUNY New York New York 10016 USA

Recently, a Dirac exceptional point (EP) was reported in a non-Hermitian system. Unlike a Dirac point in Hermitian systems, this Dirac EP has coalesced eigenstates in addition to the degenerate energy. Also different from a typical EP, the two energy levels connected at this Dirac EP remain real in its vicinity and display a linear instead of square root dispersion, forming a tilted Dirac cone in the hybrid space consisting of a momentum dimension and a synthetic dimension for the strength of non-Hermiticity. In this paper, we first present simple three-band and two-band matrix models with a Dirac EP, where the linear dispersion of the tilted Dirac cone can be expressed analytically. Importantly, our analysis also reveals that there exist Hermitian and non-Hermitian systems that have the same (real-valued) energy spectrum in their entire parameter space, with the exception that one or more degeneracies in the former are replaced by Dirac EPs in the latter. Finally, we show the existence of an imaginary Dirac cone with an EP at its center.

关键词： PT-symmetric quantum mechanics Non-Hermitean systems Optical microcavities

来源：评论

学校读者我要写书评

暂无评论

Synaptic-Like Plasticity in 2D Nanofluidic Memristor from Competitive Bicationic Transport

arXiv

引用

arXiv 2024年

作者： Noh, Yechan Smolyanitsky, Alex Department of Physics University of Colorado Boulder BoulderCO80309 United States Applied Chemicals and Materials Division National Institute of Standards and Technology BoulderCO80305 United States Department of Materials Science and Engineering University of California Berkeley BerkeleyCA94720 United States

Synaptic plasticity, the dynamic tuning of signal transmission strength between neurons, serves as a fundamental basis for memory and learning in biological organisms. This adaptive nature of synapses is considered one of the key features contributing to the superior energy efficiency of the brain. In this study, we utilize molecular dynamics simulations to demonstrate synaptic-like plasticity in a subnanoporous 2D membrane. We show that a train of voltage spikes dynamically modifies the membrane’s ionic permeability in a process involving competitive bicationic transport. This process is shown to be repeatable after a given resting period. Due to a combination of sub-nm pore size and the atomic thinness of the membrane, this system exhibits energy dissipation of 0.1–100 aJ per voltage spike, which is several orders of magnitude lower than 0.1–10 fJ per spike in the human synapse. We reveal the underlying physical mechanisms at molecular detail and investigate the local energetics underlying this apparent synaptic-like behavior. Copyright © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

Charge-Induced Aggregation of Emulsified Oil Droplets in Water with Presence of Functionalized Stainless Steel Felt

SSRN

引用

SSRN 2024年

作者： Li, Qian-Ru Wang, Xin-Yi Yasin, Akram Qi, Ting-Yong Liu, Xuqing Mao, Zhexin Ma, Peng-Cheng Laboratory of Environmental Science and Technology The Xinjiang Technical Institute of Physics and Chemistry Key Laboratory of Functional Materials and Devices for Special Environments Chinese Academy of Sciences Urumqi830011 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Science Beijing100049 China School of Materials Science and Engineer Xinjiang University Urumqi830017 China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials School of Materials Science and Engineering Northwestern Polytechnical University Shanxi Xi’an710072 China Department of Materials University of Manchester ManchesterM13 9PL United Kingdom

Oil-water mixtures, especially the surfactant-stabilized oil-in-water emulsions with high stability, are causing great difficulties for effective separation. In this work, a modification strategy was proposed to prepare functionalized stainless steel felt for emulsion separation by coating the felt with 3-triethoxysilylpropylamine, followed by the introduction of silica nanoparticles using a sulfur-based three-component coupling reaction. To satisfy the pore size requirement for effective emulsion separation, the developed felt was processed using a compression molding. With special wettability, optimized pore size, and electrostatic demulsification mechanism, the positive charged felt delivered outstanding separation capabilities for oil-in-water emulsions stabilized by various surfactants. Specifically, the flux and COD removal efficiency for the anionic-stabilized emulsion were up to 3911 L/m2/h and 95.3%, while for cationic-stabilized emulsions, which were 1305 L/m2/h and 93.1%. The results indicated that surface charges played an important role in governing the separation performance of the felt, and the electrostatic attraction demulsification demonstrated better separation capabilities than that from the electrostatic repulsion process. © 2024, The Authors. All rights reserved.

关键词： Electrostatics

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：