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Surface-dominated conductance scaling in Weyl semimetal NbAs

npj Computational materials 2024年第1期10卷 2370-2378页

作者： Sushant Kumar Yi-Hsin Tu Sheng Luo Nicholas A.Lanzillo Tay-Rong Chang Gengchiau Liang Ravishankar Sundararaman Hsin Lin Ching-Tzu Chen Department of Materials Science&Engineering Rensselaer Polytechnic Institute1108th StTroyNY 12180USA IBM Thomas J.Watson Research Center 1101 Kitchawan RoadYorktown HeightsNY 10598USA Department of Physics Cheng Kung UniversityTainan CityTaipei Department of Electrical and Computer Engineering College of Design and EngineeringNational University of SingaporeSingaporeSingapore IBM Research 257 Fuller RoadAlbanyNY 12203USA Institute of Physics Academia SinicaTaipeiTaipei

Protected surface states arising fromnon-trivial bandstructure topology in semimetals can potentially enable advanced device functionalities in compute,memory,interconnect,sensing,and *** necessitates a fundamental understanding of surface-state transport in nanoscale topological ***,we investigate quantum transport in a prototypical topological semimetal NbAs to evaluate the potential of this class of materials for beyond-Cu interconnects in highly-scaled integrated *** density functional theory(DFT)coupled with non-equilibrium Green’s function(NEGF)calculations,we show that the resistance-areaRAproduct in NbAs films decreases with decreasing thickness at the nanometer scale,in contrast to a nearly constant RA product in ideal Cu *** anomalous scaling originates from the disproportionately large number of surface conduction states which dominate the ballistic conductance by up to 70%in NbAs thin *** also show that this favorable RA scaling persists even in the presence of surface defects,in contrast to RA sharply increasing with reducing thickness for films of conventional metals,such as Cu,in the presence of surface *** results underscore the potential of topological semimetals as future back-end-of-line(BEOL)interconnect metals.

关键词： scaling topological conductance

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Evaluation of temperature dependent vortex pinning properties in strongly pinned YBa_(2)Cu_(3)O_(7-δ)thin films with Y_(2)BaCuO_(5)nanoinclusions

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Superconductivity 2024年第1期9卷 95-105页

作者： Alok K.Jha Kaname Matsumoto Tomoya Horide Shrikant Saini Ataru Ichinose Paolo Mele Yutaka Yoshida Satoshi Awaji Department of Materials Science and Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Department of Mechanical and Control Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Central Research Institute of Electrical Power Industry YokosukaKanagawa 240-0196Japan College of Engineering-Innovative Global Program Shibaura Institute of TechnologyMinuma-kuSaitama 337-8570Japan Department of Energy Engineering and Science Nagoya UniversityChikusa-kuNagoya 464-8603Japan Institute for Materials Research Tohoku UniversityAoba-kuSendai 980-8577Japan

The pinning of quantized magnetic vortices in superconducting YBa_(2)Cu_(3)O_(7-δ)(YBCO or Y123)thin films with Y_(2)BaCuO_(5)(Y211)nanoinclusions have been investigated over wide temperature range(4.2-77 K).The concentration of Y211 nanoinclusions has been systematically varied inside YBCO thin films prepared by laser ablation technique using surface modified target *** pinning force density values(Fp∼0.5 TNm^(−3)at 4.2 K,9 T)have been observed for the YBCO film with moderate concentration of Y211 nanoinclusions(3.6 area%on ablation target).In addition,uniform enhancement in critical current density(J_(c))was observed in the angular dependent J_(c)measurement of YBCO+Y211 nanocomposite films.Y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in‐field J_(c)values over a wide range of *** the concentration of Y211 secondary phase into Y123 film matrix results into agglomeration of Y211 phase and observed as increased Y211 nanoparticle *** larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower *** of the temperature dependence of J_(c)for YBCO+Y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.

关键词： YBCO thin film Critical current Vortex pinning Nanoscale APCs

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Machine Vision Observation, Artificial Intelligence Pattern Recognition, Protective Circuit Design, Characterization of Multiple materials, and Nano-Structural Analysis for Investigating InGaN Green Light Emitting Diode Degradation in a Salty Water Vapor Environment

Machine Vision Observation, Artificial Intelligence Pattern ...

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2024 IEEE International Reliability Physics Symposium, IRPS 2024

作者： Chen, Cheng-Shan Yang, Chun-Yen Yang, Shao-Jui Wang, Deng-Yi Kuo, Yaw-Wen Hsiao, Wei-Han Chou, Hsin-Hung Lin, Chia-Feng Li, Yung-Hui Wu, Yewchung Sermon Chen, Hsiang Han, Jung National Yang Ming Chiao Tung University Department of Materials Science and Engineering Hsinchu30010 Taiwan National Chi Nan University Department of Electrical Engineering Nantou54561 Taiwan National Chi Nan University Department of Applied Materials and Optoelectronic Engineering Nantou54561 Taiwan Chang Gung University Department of Electrical Engineering Taoyuan33302 Taiwan National Chi Nan University Department of Computer Science & Information Engineering Nantou54561 Taiwan National Chung Hsing University Department of Materials Science and Engineering Taichung40227 Taiwan Hon Hai Research Institute AI Research Center Taipei11494 Taiwan Yale University Department of Electrical Engineering New HavenCT06511 United States

ISBN: (纸本)9798350369762

This study delves into the degradation of GaN-based LEDs in saline environments, a relatively underexplored area of research. LEDs are known for their longevity, but face challenges under extreme conditions. Utilizing artificial intelligence, machine vision, and material analysis, this study detects early signs of LED degradation[1], [2]. The results highlight the impact of saline exposure on LED performance, with some LEDs continuing to function for up to 30 minutes before failure. Advanced circuits ensure uninterrupted operation. Encompassing electrical engineering, computer science, and materials science, this study provides a comprehensive approach to LED fault detection and protection. © 2024 IEEE.

关键词： III-V semiconductors

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Continuum Modeling and Optimization of Group-V Doping in CdSex Te1-x 52

Continuum Modeling and Optimization of Group-V Doping in CdS...

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52nd IEEE Photovoltaic Specialist Conference, PVSC 2024

作者： Xiang, Xiaofeng Gehrke, Aaron Tong, Yijun Dunham, Scott T. Molecular Engineering & Sciences Institute University of Washington SeattleWA98195 United States University of Washington Department of Materials Science & Engineering SeattleWA98195 United States University of Washington Department of Electrical & Computer Engineering SeattleWA98195 United States

ISBN: (纸本)9781665464260

CdTe and its alloy CdSeTe are widely used in optoelectronic devices, such as radiation detectors and solar cells, due to their superior electrical properties. However, the formation of point defects and defect complexes in these materials can significantly affect their performance. As a result, understanding the point defect formation and interaction processes in CdTe and CdSeTe alloy is of great importance. In recent years, density functional theory (DFT) calculations have emerged as a powerful tool for investigating the properties of defects in semiconductors. In this paper, we use the results of DFT+U calculations and continuum model to understand and optimize As and P dopability in CdSeTe alloy. © 2024 IEEE.

关键词： Cadmium telluride

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Universal sublinear resistivity in vanadium kagome materials hosting charge density waves

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Physical Review B 2024年第3期110卷 035135-035135页

作者： Shirin Mozaffari William R. Meier Richa P. Madhogaria Nikolai Peshcherenko Seoung-Hun Kang John W. Villanova Hasitha W. Suriya Arachchige Guoxin Zheng Yuan Zhu Kuan-Wen Chen Kaila Jenkins Dechen Zhang Aaron Chan Lu Li Mina Yoon Yang Zhang David G. Mandrus Department of Materials Sciences and Engineering 01187 Dresden Germany Materials Science and Technology Division Center for Nanophase Materials Sciences Department of Physics and Astronomy Department of Physics Min H. Kao Department of Electrical Engineering and Computer Science

The recent discovery of a charge density (CDW) state in ScV6Sn6 at TCDW = 91 K offers new opportunities to understand the origins of electronic instabilities in topological kagome systems. By comparing to the isostructural non-CDW compound LuV6Sn6, we unravel interesting electrical transport properties in ScV6Sn6, above and below the charge-ordering temperature. We observed that by applying a magnetic field along the a axis, the temperature behavior of the longitudinal resistivity in ScV6Sn6 changes from metal-like to insulator-like above the CDW transition. We show that in the charge-ordered state ScV6Sn6 follows the Fermi liquid behavior while above that, the resistivity varies sublinearly over a broad temperature range. The sublinear resistivity, which scales by T3/5 is a common feature among other vanadium-containing kagome compounds exhibiting CDW states such as KV3Sb5, RbV3Sb5, and CsV3Sb5. By contrast, the sublinear behavior of the resistivity does not occur in LuV6Sn6. Finally, we show anomalous Hall-like behavior in ScV6Sn6 below TCDW, which is absent in the Lu compound. Comparing the transport properties of ScV6Sn6 and LuV6Sn6 is valuable to highlight the impacts of the unusual CDW in the Sc compound.

关键词： Charge density waves Electronic structure Magnetotransport van Hove singularity Density functional calculations Transport techniques

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Objective Sleep Quality Measurement based on Fuzzy Logic and Wearable Device 8

Objective Sleep Quality Measurement based on Fuzzy Logic and...

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8th International Conference on computer science and Computational Intelligence, ICCSCI 2023

作者： Wijaya, Jason A. Andersen, Pauw D. Surantha, Nico Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta11480 Indonesia Department of Electrical Electronic and Communication Engineering Tokyo City University Japan

Sleep is the natural state of relaxation for human being. Sleep quality is an essential yet frequently neglected aspect of sleep in general. Sleep quality is essential because it allows the body to restore itself and prepare for the next day. The standard method for evaluating sleep quality was subjective evaluation. Actigraphy devices, which can measure the sleep cycle, are now widely available. This study developed a method using Fuzzy Logic and an actigraphy device to measure and classify sleep quality. The fuzzy logic method was developed in several stages, which are determining the sleep quality measurement parameters, constructing the fuzzy set for each input variable, and developing the fuzzy rules. To evaluate the proposed fuzzy model, five individuals were invited to participate in the experiment and required to complete the PSQI subjective sleep questionnaire. The evaluation result shows that our proposed Fuzzy model achieves lower error compared to the existing method. © 2023 The Authors. Published by Elsevier B.V.

关键词： actigraphy artificial intelligences fuzzy logic sleep sleep quality

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Analysis and Design of Vector Holographic Metasurfaces

Analysis and Design of Vector Holographic Metasurfaces

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Pitilakis, A. Tsilipakos, O. Tasolamprou, A.C. Tsioliaridou, A. Kantartzis, N.V. Ioannidis, S. Liaskos, C. Kafesaki, M. Institute of Electronic Structure and Laser Foundation for Research and Technology Hellas Greece Aristotle University of Thessaloniki School of Electrical and Computer Engineering Greece Theoretical and Physical Chemistry Institute National Hellenic Research Foundation Greece National and Kapodistrian University of Athens Department of Physics Greece Institute of Computer Science Foundation for Research and Technology Hellas Greece Technical University of Crete School of Electrical & Computer Engineering Greece University of Ioannina Department of Computer Science and Engineering Greece University of Crete Department of Materials Science and Technology Greece

ISBN: (纸本)9798350375909

In this work we present a comprehensive framework for the analysis and design of vector holographic metasurfaces (VHMS). The term vector refers to the metasurface ability to manipulate the polarization of the scattered wave, while holographic refers to the configuration of the metasurface aperture, which can have any arbitrary complex profile in its equivalent surface impedance (phase and/or magnitude). We start from the presentation of the analysis of such VHMS, i.e., the calculation of its scattering under given equivalent surface impedance configuration and illumination;the analysis relies on physical optics and can, in theory, model the scattering and diffraction by a finite-aperture metasurface of arbitrary convex shape under arbitrary spatially coherent wavefront illumination. We then present the VHMS design and synthesis procedure, i.e., we compute its equivalent and physical configuration, when given the illuminating wavefront and the desired scattering response or functionality, e.g., beam steering or focusing. For the synthesis, we use a simple scalable unit cell topology incorporating square conductor patches interconnected with lumped complex loads;these can locally and continuously tune the VHMS phase and amplitude response, with independent control over both polarizations, thus allowing arbitrary incident-to-scattered wavefront transformations. These versatile devices, especially when fused with wavefront sensing capabilities, can be used in applications spanning wireless communications (e.g., beamforming, integrated/joint sensing and communication, or programmable wireless environments), radar scattering (e.g., stealth), and holography/imaging. © 2024 IEEE.

关键词： Wavefronts

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Expanding chiral metamaterials for retrieving fingerprints via vibrational circular dichroism

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Light(science & Applications) 2023年第7期12卷 1401-1414页

作者： Cheng Xu Zhihao Ren Hong Zhou Jingkai Zhou Chong Pei Ho Nan Wang Chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Center for Inteligent Sensors and MEMS(CISM) National University of SingaporeSingapore 117608Singapore institute of Microelectronics(IME) Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore NUS Graduate School for Integrative Science and Engineering Program(ISEP) National University of SingaporeSingapore 117456Singapore

Circular dichroism(CD)spectroscopy has been widely demonstrated for detecting chiral ***,the determination of chiral mixtures with various concentrations and enantiomeric ratios can be a challenging *** solve this problem,we report an enhanced vibrational circular dichroism(VCD)sensing platform based on plasmonic chiral metamaterials,which presents a 6-magnitude signal enhancement with a selectivity of chiral *** by coupled-mode theory,we leverage both in-plane and out-of-plane symmetry-breaking structures for chiral metamaterial design enabled by a two-step lithography process,which increases the near-field coupling strengths and varies the ratio between absorption and radiation loss,resulting in improved chiral light-matter interaction and enhanced molecular VCD ***,we demonstrate the thin-film sensing process of BSA andβ-lactoglobulin proteins,which contain secondary structures a-helix andβ-sheet and achieve a limit of detection down to zeptomole ***,we also,for the first time,explore the potential of enhanced VCD spectroscopy by demonstrating a selective sensing process of chiral mixtures,where the mixing ratio can be successfully differentiated with our proposed chiral *** findings improve the sensing signal of molecules and expand the extractable information,paving the way toward label-free,compact,small-volume chiral molecule detection for stereochemical and clinical diagnosisapplications.

关键词： chiral vibrational circular

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Super-Resolution Displacement Spectroscopic Sensing over a Surface“Rainbow”

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engineering 2022年第10期17卷 75-81页

作者： Lyu Zhou Nan Zhang Chang Chieh Hsu Matthew Singer Xie Zeng Yizheng Li Haomin Song Josep Jornet Yun Wu Qiaoqiang Gan Department of Electrical Engineering The State University of New York at BuffaloBuffaloNY 14260USA Department of Biomedical Engineering The State University of New York at BuffaloBuffaloNY 14260USA Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA Material Science Engineering Program King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia

Subwavelength manipulation of light waves with high precision can enable new and exciting applications in spectroscopy,sensing,and medical *** these applications,miniaturized spectrometers are desirable to enable the on-chip analysis of spectral *** particular,for imaging-based spectroscopic sensing mechanisms,the key challenge is to determine the spatial-shift information accurately(i.e.,the spatial displacement introduced by wavelength shift or biological or chemical surface binding),which is similar to the challenge presented by super-resolution ***,we report a unique"rainbow"trapping metasurface for on-chip spectrometers and *** with super-resolution image processing,the low-setting 4×optical microscope system resolves a displacement of the resonant position within 35 nm on the plasmonic rainbow trapping metasurface with a tiny area as small as0.002 *** unique feature of the spatial manipulation of efficiently coupled rainbow plasmonic resonances reveals a new platform for miniaturized on-chip spectroscopic analysis with a spectral resolution of 0.032 nm in wavelength *** this low-setting 4×microscope imaging system,we demonstrate a biosensing resolution of 1.92×109exosomes per milliliter for A549-derived exosomes and distinguish between patient samples and healthy controls using exosomal epidermal growth factor receptor(EGFR)expression values,thereby demonstrating a new on-chip sensing system for personalized accurate bio/chemical sensing applications.

关键词： Rainbow trapping Metasurface Surface plasmon polaritons Super-resolution displacement On-chip biosensing

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Perovskite nickelate thin film devices as adaptive weights for photonic computing networks

Perovskite nickelate thin film devices as adaptive weights f...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Park, Tae Joon Idjadi, Mohamad Hossein Ashtiani, Farshid Wan, Chenghao Kats, Mikhail A. Ramanathan, Shriram School of Materials Engineering Purdue University West LafayetteIN47907 United States Nokia Bell Labs Murray HillNJ07974 United States 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 Department of Electrical and Computer Engineering Rutgers The State University of New Jersey PiscatawayNJ08854 United States

ISBN: (纸本)9781957171395

Atomic layer deposition (ALD) and sputtering of strongly correlated perovskite nickelate thin films are emerging fields for wafer-scale demonstration of quantum technologies. Functional properties of such oxide quantum materials for proof-of-principle non-Von Neumann photonic computing networks are reported. © Optica Publishing Group 2024 ©2024TheAuthor(s)

关键词： Perovskite

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