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Paramagnon heat capacity and anomalous thermopower in anisotropic magnetic systems: Understanding interlayer spin correlations in a magnetically disordered phase

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Physical Review B 2024年第5期109卷 054418-054418页

作者： Fatemeh Heydarinasab Morteza Jazandari Md Mobarak Hossain Polash Jahanfar Abouie Daryoosh Vashaee Department of Physics Faculty of Science University of Sistan and Baluchestan Zahedan 98167-45845 Iran Department of Physics Institute for Advanced Studies in Basic Sciences (IASBS) Zanjan 45137-66731 Iran Department of Materials Science and Engineering North Carolina State University Raleigh North Carolina 27606 USA Department of Electrical and Computer Engineering North Carolina State University Raleigh North Carolina 27606 USA

The interplay between entropy transport and charge carriers–paramagnon interaction in the Onsager linear system has been a subject of debate due to the limited theoretical and experimental understanding of paramagnon heat capacity. In this study, we investigate this interplay in an anisotropic layered magnetic system using cluster mean-field theory with spin quantum correlations. By examining spin correlation functions between different spins with various types of clustering, we derive the spin correlation function as a function of distance and temperature for the interlayer clusters both below and above the magnetic order phase transition. Our analysis reveals that paramagnons characterized by pronounced spin correlations among interlayer nearest-neighbor spins exhibit a nonzero heat capacity, providing valuable insights into the dynamics of entropy transport. The findings align with experimental observations, lending strong support to the validity of the paramagnon-drag thermopower concept. This study sheds light on the intricate dynamics and thermodynamic properties of paramagnons, advancing our understanding of entropy transport in complex systems.

关键词： Entropy Specific heat Spin dynamics Thermoelectric effects

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Printed paper-based devices for detection of food-borne contaminants: New device design and new colorimetric image analysis methods 27

Printed paper-based devices for detection of food-borne cont...

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IS and T International Symposium on Electronic Imaging: 27th Color Imaging: Displaying, Processing, Hardcopy, and Applications, COLOR 2022

作者： Liang, Qiyue Zhao, Min Ulloa Gomez, Ana Maria N.A. Chiu, George T.C. Stanciu, Lia A. Deering, Amanda J. Allebach, Jan P. School of Electrical and Computer Engineering Purdue University West LafayetteIN United States School of Materials Engineering Purdue University West LafayetteIN United States School of Mechanical Engineering Purdue University West LafayetteIN United States Department of Food Science Purdue University West LafayetteIN United States

In this paper, we introduce a paper-based microfluidic device design that allows liquids to flow at a constant rate through the channels. The device pattern is designed based on a flow rate control test. Our proposed device can be easily manufactured by a wax printer and be printed on filter paper. The primary function of the paper device is to measure the concentration of hazardous chemicals such as heavy metals and bacteria in liquids. We also propose two new image analysis metrics, hue difference and chroma magnitude difference, for analyzing the color of images as a means of identifying the concentration of heavy metals in solutions. In addition, we discuss in detail the image processing pipeline for analyzing the devices from the initial image capturing to segmentation and analysis. This paper also discusses future goals and possible directions to take, such as handling the device from different viewpoints. © 2022, Society for Imaging science and Technology.

关键词： Heavy metals

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Electron Dynamics of Femtosecond Laser Induced Plasma Inside Multilayer Dielectric High Reflectors Studied Using Particle-in-Cell (PIC) Approach

Electron Dynamics of Femtosecond Laser Induced Plasma Inside...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Ziyao Su Joseph R. Smith Enam Chowdhury Department of Materials Science and Engineering The Ohio State University Columbus OH Department of Physics Marietta College Marietta OH Department of Electrical and Computer Engineering The Ohio State University Columbus OH Department of Physics The Ohio State University Columbus OH

The strong field ionized electron motion and energy in the interaction of few-cycle femtosecond laser and SiO 2 /HfO 2 -based multilayer dielectric reflector designed for 800nm is studied using the PIC method incorpor... 详细信息

ISBN: (纸本)9798350369311

关键词： Laser theory Ionization Dynamics Lasers and electrooptics Nonhomogeneous media Dielectrics Plasmas Electro-optical waveguides Electrons

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Soliton Vortex Comb Generation in an AlGaAs Microresonator for Self-Torque Pulse Synthesis

Soliton Vortex Comb Generation in an AlGaAs Microresonator f...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Liu, Y. Chen, B. Zhou, Y. Ye, C. Cao, Q. Huang, P. Kim, C. Zheng, Y. Oxenløwe, L.K. Yvind, K. Li, J. Li, J. Zhang, Y. Dong, C. Fu, S. Zhan, Q. Wang, X. Liu, J. Pu, M. DTU Electro Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark State Key Laboratory of Optoelectronic Materials and Technologies School of Physics School of Electronics and Information Technology Sun Yat-sen University Guangzhou China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai China Zhangjiang Laboratory Shanghai China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen China

We demonstrate bright soliton generation at room temperature within a grating-dressed AlGaAs-on-insulator microresonator and the simultaneous emission of phase-locked vortices, enabling the synthesis of self-torque pu... 详细信息

关键词： Microresonators

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High thermoelectric power factor in Ni-Fe alloy for active cooling applications

arXiv

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arXiv 2025年

作者： Li, Shuai Das, Sree Sourav Wang, Haobo Bati, Sujit Balachandran, Prasanna V. Shiomi, Junichiro Floro, Jerrold A. Zebarjadi, Mona Department of Materials Science and Engineering University of Virginia CharlottesvilleVA22904 United States Electrical and Computer Engineering Department University of Virginia CharlottesvilleVA22904 United States Department of Physics University of Virginia CharlottesvilleVA22904 United States Department of Mechanical Engineering University of Tokyo Tokyo Japan

Metallic thermoelectric materials are promising candidates for active cooling applications, where high thermal conductivity and a high thermoelectric power factor are essential to maximize effective thermal conductivity. While metals inherently possess high thermal and electrical conductivities, they typically exhibit low Seebeck coefficients. In this work, we create a database and apply machine learning techniques to identify metallic binary alloys with large Seebeck coefficients. Specifically, we identify Ni-Fe as a promising candidate for active cooling. We then fabricate Ni-Fe ingots and demonstrate thermoelectric power factor values as high as 120 μW/cm·K2 at 200 K for these stable alloys, which are composed of cost-effective and abundant elements. Furthermore, we show that the effective thermal conductivity of these alloys, under small temperature differences, can exceed that of pure copper at temperatures above 250 K. Copyright © 2025, The Authors. All rights reserved.

关键词： Iron alloys

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Hybrid photonic integration for multifunctional laser systems on a chip-scale platform

Hybrid photonic integration for multifunctional laser system...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Siwei Zeng Xiaolei Zhao Yeyu Zhu Lance Sweatt Lin Zhu Department of Electrical and Computer Engineering Center for Optical Materials Science and Engineering Technologies Clemson University Clemson SC

We discuss our recent work in hybrid integration of III/V and Si3N4 PICs and demonstrate diode laser wavelength tuning and linewidth reduction, beam steering with multiple sources, coherent beam combining, and wavelen... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Industries Beam steering Power lasers Hybrid power systems Diode lasers System-on-chip Laser beams

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Global distribution of forest classes and leaf biomass for use as alternative foods to minimize malnutrition

World Food Policy

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World Food Policy 2021年第2期7卷 128-146页

作者： Fist, Tim Adesanya, Adewale A. Denkenberger, David Pearce, Joshua M. Alliance to Feed the Earth in Disasters (ALLFED) Environmental and Energy Program Social Science Department Michigan Technological University Department of Mechanical Engineering University of Alaska Fairbanks Department of Electrical and Computer Engineering Western University

Due to the ready availability of tree leaves in many geographies, the alternative food of leaf concentrate currently has the potential to alleviate hunger in over 800 million people. It is therefore potentially highly impactful to determine the edibility of leaf concentrates, which are in the same regions as the world's most undernourished populations. Unfortunately, the toxicity of leaf concentrate for most common tree leaf types has not been screened and the cost of doing so demands a prioritization. This preliminary study explores this potential solution to world hunger by finding the forest classes most likely to offer proximate access to the world's hungry, thus providing the basis for a prioritized list of leaf types to screen for toxicity. Specifically, this study describes a novel methodology for mapping available green leaf biomass and corresponding forest classes (e.g., tropical moist deciduous forest), and their spatial relationship to the global distribution of people who are underweight. These results will be useful for developing a targeted list of tree species to conduct leaf toxicity analysis on, in the interest of developing leaves as an alternative food source for both current malnutrition problems and global catastrophic scenarios. © 2021 Policy Studies Organization.

关键词： agriculture edible leaves forests GIS global catastrophic risk hunger

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A Position Control System for a Single-port Laparoscopic Manipulating Robot

A Position Control System for a Single-port Laparoscopic Man...

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2022 International electrical engineering Congress, iEECON 2022

作者： Sonsilphong, Amornthep Sonsilphong, Suphachoke Soemphol, Chaiyong Hormdee, Daranee Khampitak, Kovit Rajamangala University of Technology Isan Department of Electrical Engineering Khon Kean Thailand Khon Kaen University Data Science Health Informatics Program Faculty of Medicine Khon Kaen Thailand Mahasarakham University Faculty of Engineering Department of Electrical Engineering Mahasarakham Thailand Khon Kaen University Embedded System RD Group Computer Engineering Faculty of Engineering Khon Kaen Thailand Khon Kean University Faculty of Medicine Department of Obstetrics and Gynecology Khon Kean Thailand

ISBN: (纸本)9781665402064

The research herein proposes a position control system, designed for a single-port surgical robot, based on the lockup table method. The programmable logic controller (PLC) was implemented to move the single- port surgical robot and handle laparoscope and surgical instruments with feedback control. The output responses of the desired angle were investigated under several conditions. The rotating angle allows movement of the laparoscope in the range of -10o to +10o. The error of the desired position of the designed system was less than approximately ± 0.1o. Moreover, the output data from several experiments may be employed to improve the open-loop control systems. This system is also capable of providing computer vision task implementation, enabling semi- automatic or automatic surgery in the future. © 2022 IEEE.

关键词： Laparoscopy

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Tunable Threshold in VO2-based Photonic Devices Enabled by Defect engineering

Tunable Threshold in VO2-based Photonic Devices Enabled by D...

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CLEO: QELS_Fundamental science, QELS 2022

作者： Wan, Chenghao Hafermann, Martin Park, Tae Joon Zhang, Zhen Xiao, Yuzhe Mei, Hongyan Ramanathan, Shriram Ronning, Carsten Kats, Mikhail A. Department of Electrical and Computer Engineering University of Wisconsin-Madison MadisonWI53706 United States Department of Materials Science and Engineering University of Wisconsin-Madison MadisonWI53706 United States Institute of Solid State Physics Friedrich-Schiller-Universität Jena Thuringia Jena07743 Germany School of Materials Engineering Purdue University West LafayetteIN47907 United States

Using ion implantation, we engineered tunable thresholds of optical switches that incorporated frequency-selective surfaces (FSSs) with thin-film VO2. We also used a focused ion beam to selectively control any passban... 详细信息

ISBN: (纸本)9781557528209

关键词： Vanadium dioxide

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MULTISCALE PHYSICS-INFORMED NEURAL NETWORKS FOR THE INVERSE DESIGN OF HYPERUNIFORM OPTICAL materials

arXiv

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arXiv 2024年

作者： Riganti, Roberto Zhu, Yilin Cai, Wei Torquato, Salvatore Negro, Luca Dal Physics Department Boston University Boston United States Division of Materials Science & Engineering Boston University Boston United States Department of Mathematics Southern Methodist University Dallas United States Department of Chemistry Department of Physics Princeton Materials Institute Princeton University Princeton United States Department of Electrical & Computer Engineering Division of Materials Science & Engineering Physics Department Photonics Center Boston University Boston United States

In this article, we employ multiscale physics-informed neural networks (MscalePINNs) for the inverse design of finite-size photonic materials with stealthy hyperuniform (SHU) disordered geometries. Specifically, we show that MscalePINNs can capture the fast spatial variations of complex fields scattered by arrays of dielectric nanocylinders arranged according to isotropic SHU point patterns, thus enabling a systematic methodology to inversely retrieve their effective dielectric profiles. Our approach extends the recently developed high-frequency homogenization theory of hyperuniform media and retrieves more general permittivity profiles for applications-relevant finite-size SHU systems, unveiling unique features related to their isotropic nature. In particular, we numerically corroborate the existence of a transparency region beyond the long-wavelength approximation, enabling effective and isotropic homogenization even without disorder-averaging, in contrast to the case of uncorrelated Poisson random patterns. The flexible multiscale network approach introduced here enables the efficient inverse design of more general effective media and finite-size optical metamaterials with isotropic electromagnetic responses beyond the limitations of traditional homogenization theories. Copyright © 2024, The Authors. All rights reserved.

关键词： Inverse problems

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