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arXiv 2023年

作者： Yu, Hsuan Ming Sharma, Shivam Agarwal, Shivang Liebman, Olivia Banerjee, Amartya S. Department of Materials Science and Engineering University of California Los AngelesCA90095 United States Department of Aerospace Engineering and Mechanics University of Minnesota MinneapolisMN55455 United States Department of Electrical and Computer Engineering University of California Los AngelesCA90095 United States

In recent years, a number of bulk materials and heterostructures have been explored due their connections with exotic materials phenomena emanating from flat band physics and strong electronic correlation. The possibility of realizing such fascinating material properties in simple realistic nanostructures is particularly exciting, especially as the investigation of exotic states of electronic matter in wire-like geometries is relatively unexplored in the literature. Motivated by these considerations, we introduce in this work carbon Kagome nanotubes (CKNTs) — a new allotrope of carbon formed by rolling up Kagome graphene, and investigate this material using specialized first principles calculations. We identify two principal varieties of CKNTs — armchair and zigzag, and find both varieties to be stable at room temperature, based on ab initio molecular dynamics simulations. CKNTs are metallic and feature dispersionless states (i.e., flat bands) near the Fermi level throughout their Brillouin zone, along with an associated singular peak in the electronic density of states. We calculate the mechanical and electronic response of CKNTs to torsional and axial strains, and show that CKNTs appear to be more mechanically compliant than conventional carbon nanotubes (CNTs). Additionally, we find that the electronic properties of CKNTs undergo significant electronic transitions — with emergent partial flat bands and tilted Dirac points — when twisted. We develop a relatively simple tight-binding model that can explain many of these electronic features. We also discuss possible routes for the synthesis of CKNTs. Overall, CKNTs appear to be unique and striking examples of realistic elemental quasi-one-dimensional materials that may display fascinating material properties due to strong electronic correlation. Distorted CKNTs may provide an interesting nanomaterial platform where flat band physics and chirality induced anomalous transport effects may be studied together. © 2023, C

关键词： Electronic properties

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Synergetic Effect of Ligand Removal, Reparation, and Surface Encapsulation of Cspbbr3 Quantum Dots for Improved Brightness and Stability

SSRN

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SSRN 2022年

作者： Song, Jang-Kun Zhang, Yi Song, Suk-Ho Yoo, Jae-In Kim, Hyo-Bin Shan, Qingsong Zeng, Haibo Department of Electrical and Computer Engineering Sungkyunkwan University Jangan-Gu Gyeonggi-do Suwon16419 Korea Republic of MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics & Nanomaterials School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing210094 China

Colloidal CsPbBr3 perovskite quantum dots (PQDs) are promising optoelectronic materials for use in solution-processed photoelectric devices. However, fabricating PQD thin films with high efficiency and good stability is still challenging. In this study, we investigate the synergetic effects of ligand removal using MeOAc washing, defect repair using cesium acetate (CsAc), and surface encapsulation using hexamethyldisilazane (HMDS) on the photoluminescence (PL) intensity and ambient stability of PQD thin films. The PL intensity is significantly improved by ligand removal and defect repair, and ambient stability is governed primarily by the SiO passivation process. However, the synergetic effect of these post-treatments is also important;the highest PL intensity and the best ambient stability are observed for the sample treated by all three post treatments in the proper order. The PL intensity is enhanced by a factor of up to 3.4, and the ambient instability is reduced by approximately 40 % compared with that of the untreated sample. Defect repair using CsAc is achievable only after the ligand is completely removed. Thus, these results provide essential information and an approach for post-treatments to obtain PQD films with high efficiency and robust stability. © 2022, The Authors. All rights reserved.

关键词： Stability

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Quadrature hybrid RF photonic coupler using an integrated frequency comb source

Quadrature hybrid RF photonic coupler using an integrated fr...

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Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015

作者： Nguyen, Thach G. Shoeiby, Mehrdad Chu, Sai T. Morandotti, Roberto Mitchell, Arnan Moss, David J. School of Electrical and Computer Engineering RMIT University MelbourneVIC3001 Australia Department of Physics and Materials Science City University of Hong Kong Hong Kong INRS - Énergie Matériaux et Télécommunications 1650 Blvd Lionel Boulet VarennesQCJ3X1S2 Canada

An integrated CMOS-compatible multiple-wavelength optical source is exploited for photonic implementation of a quadrature hybrid RF coupler based on multi-tap transversal filtering scheme. Four octave bandwidth with a... 详细信息

ISBN: (纸本)9781557520005

关键词： Taps

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Experimental Characterization of the Reliability of 3-Terminal Dual-Damascene Copper Interconnect Trees

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MRS Online Proceedings Library 2011年第1期716卷 8131-8136页

作者： Gan, C. L. Thompson, C. V. Pey, K. L. Choi, W. K. Wei, F. Yu, B. Hau-Riege, S. P. Advanced Materials for Micro- and Nano- Systems Programme Singapore-MIT Alliance Singapore Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge USA National University of Singapore now with School of Electrical & Electronics Engineering Nanyang Technological University Nanyang Avenue Singapore Department of Electrical & Computer Engineering National University of Singapore Singapore Institute of Microelectronics San Jose USA Intel Corp. Hillsborough OR 97124 now with Lawrence Livermore National Laboratory Livermore USA

Electromigration experiments have been carried out on simple Cu dual-damascene interconnect tree structures consisting of straight via-to-via (or contact-to-contact) lines with an extra via in the middle of the line. As with Al-based interconnects, the reliability of a segment in this tree strongly depends on the stress conditions of the connected segment. Beyond this, there are important differences in the results obtained under similar test conditions for Al-based and Cu-based interconnect trees. These differences are thought to be associated with variations in the architectural schemes of the two metallizations. The absence of a conducting electromigrationresistant overlayer in Cu technology, and the possibility of liner rupture at stressed vias lead to significant differences in tree reliabilities in Cu compared to Al.

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Improved lightpath (wavelength) routing in large WDM networks

Improved lightpath (wavelength) routing in large WDM network...

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International Conference on Distributed Computing Systems

作者： Weifa Liang G. Havas Xiaojun Shen Department of Mathematics University of Queensland QLD Australia Centre for Discrete Mathematics and Computing Department of Computer Science and Electrical Engineering University of Queensland QLD Australia Computer Science Telecommunications Program University of Missouri Kansas City Kansas City USA

We address the problem of efficient circuit switching in wide area networks. The solution provided is based on finding optimal routes for lightpaths and semilightpaths. A lightpath is a fully optical transmission path, while a semilightpath is a transmission path constructed by chaining several lightpaths together, using wavelength conversion at their junctions. The problem thus is to find an optimal lightpath/semilightpath in the network in terms of the cost of wavelength conversion and the cost of using the wavelengths on links. We first present fast, efficient algorithms both for the general problem and for a natural restricted version. The new algorithms outperform earlier work, providing time improvements amounting to an almost linear time factor in most cases. Also, all our algorithms can be implemented on the network in a distributed way.

关键词： Wavelength routing Intelligent networks WDM networks Optical wavelength conversion Biomedical optical imaging Optical fiber networks Costs High speed optical techniques Bandwidth Mathematics

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Bandgap Dependence of Near-Conduction Band State in (AgyCu1-y)(InxGa1-x)Se2Solar Cells 49

Bandgap Dependence of Near-Conduction Band State in (AgyCu1-...

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49th IEEE Photovoltaics Specialists Conference, PVSC 2022

作者： Miller, Michael F. Bothwell, Alexandra M. Valdes, Nicholas Paetel, Stefan Farshchi, Rouin Kanevce, Ana Shafarman, William Kuciauskas, Darius Arehart, Aaron R. The Ohio State University Department of Electrical & Computer Engineering ColumbusOH43210 United States National Renewable Energy Laboratory GoldenCO80401 United States University of Delaware Department of Materials Science & Engineering NewarkDE19716 United States First Solar Inc. Santa ClaraCA95050 United States Stuttgart70563 Germany MiaSolé Hi-Tech Corp. Santa ClaraCA95051 United States

ISBN: (纸本)9781728161174

(Ag, CU) ( mathbf{In}, mathbf{Ga}) mathbf{Se}-{ boldsymbol{2}}-based solar cells have achieved high collection efficiencies, but defects still limit efficiencies well below the theoretical limit. The near-conduction band defect, typically observed at mathbf{E}-{ mathbf{V}} boldsymbol{+0.98} eV, has been ubiquitous across ( mathbf{Ag}, mathbf{Cu}) ( mathbf{In}, mathbf{Ga}) mathbf{Se}-{ boldsymbol{2}} samples from multiple vendors. The current work explores a wider range of composition and demonstrates the trap energy varies relative to the valence band but is approximately constant relative to the conduction band (Ec-0.13 eV). There is also no definitive dependence of the trap concentration on composition. © 2022 IEEE.

关键词： Defects

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Cavity Ferromagnetic Resonance Study of Acoustic and Optic excitations in Ru/Cr/Co and Ru/Co multilayers

arXiv

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arXiv 2022年

作者： Ntetsika, P. Mitrikas, G. Litsardakis, G. Panagiotopoulos, Ioannis Department of Materials Science and Engineering University of Ioannina Ioannina45110 Greece Institute of Nanoscience and Nanotechnology National Centre for Scientific Research-Demokritos Athens Greece Laboratory of Materials for Electrotechnics Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Ioannina45110 Greece

Two series of [Ru10/Cox)]12 and [Ru6/Cr3/Cox)]12 x=16-60 easy-plane anisotropy multilayers (all thicknesses in Å), prepared by sputter deposition, are studied by cavity FMR. The acoustic modes are excited by setting the RF field perpendicular to the saturating in-plane field. Their resonance fields are in good agreement with the values predicted for acoustic modes by macrospin models, using the interlayer RKKY exchange and anisotropy fields derived by the magnetic measurements. The resonance fields of the modes excited by setting the RF field parallel to the saturating field, are lower than those expected for optical modes. This and could attributed to the existence of hybridized mixed modes, according to results of micromagnetic simulations which also show that the mode mixing is related to the inhomogeneous magnetization profile along the multilayer thickness. © 2022, CC BY.

关键词： Deposition

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Ultralow Energy van der Waals InSe PN junction heterostructure photodetector for NIR applications

Ultralow Energy van der Waals InSe PN junction heterostructu...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Chaobo Dong Chandraman Patil Hao Wang Sergiy Krylyuk Albert Davydov Hamed Dalir Volker J. Sorger Department of Electrical and Computer Engineering George Washington University Washington DC USA Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg MD USA Optelligence LLC Upper Marlboro MD USA

We show a self-driven indium selenide (InSe) p-n heterojunction photodetector with a threefold increase in responsivity at 980 nm over a photoconductor detector based on p- or n-doped regions.

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

We show a self-driven indium selenide (InSe) p-n heterojunction photodetector with a threefold increase in responsivity at 980 nm over a photoconductor detector based on p- or n-doped regions.

关键词： Photoconducting materials Detectors Heterojunctions Photodetectors Sensors Time factors Indium

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Prediction of Stroke Risk Within 7-Years Follow Up Using Machine Learning Models

Prediction of Stroke Risk Within 7-Years Follow Up Using Mac...

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2023 IEEE EMBS Special Topic Conference on Data science and engineering in Healthcare, Medicine and Biology, IEEECONF 2023

作者： Tsarapatsani, Konstantina-Helen Sakellarios, Antonis Tsakanikas, Vasilis D. Rudolf, Henrik Trampisch, Hans J. Pezoulas, Vasileios C. Matsopoulos, George K. Fotiadis, Dimitrios I. University of Ioannina Unit of Medical Technology and Intelligent Information Systems Dept. of Materials Science and Engineering IoanninaGR 45110 Greece Biomedical Research Institute Greece Institute for Biostatistics and Informatics in Medicine and Ageing Research University Medical Center Rostock Germany Ruhr University Bochum Department of Medical Informatics Biometry and Epidemiology Bochum Germany National Technical University of Athens School of Electrical and Computer Engineering Athens Greece

ISBN: (纸本)9798350383386

A stroke, also known as brain attack, occurs when blood supply to your brain is interrupted. Primary prevention relies on prompt prediction of a stroke. While currently there are several clinical risk scores, machine learning (ML) models seems to be more suitable tools for accurate prediction of stroke events. Therefore, this work focuses on the prediction of stroke within 7 years follow-up in patients who have not suffered from a stroke or TIA event at baseline. LightGBM (LGBM), Extreme Grading Boosting (XGBoost), Support Vector Machine (SVM) and Decision Tree were employed in the getABI dataset, which includes 5,897 participants. The performance of models was calculated by Accuracy (ACC), Sensitivity (SENS), Specificity (SPE) and area under the receiver operating characteristic curve (AUC) of each model. According to the comparison analysis's results, LGBM has been shown to be the most trustworthy algorithm, with accuracy 68 %. Moreover, sex, age, status of peripheral artery disease (PAD), history of myocardial infarction, angina pectoris, amputation and diabetes and pulse status of different arteries can be used as a simple and cost-effective way to predict *** Relevance: A fatal medical emergency, stroke may be anticipated using artificial intelligence, and the sooner it is predicted, the more cerebrovascular disease occurrences can be avoided. © 2023 IEEE.

关键词： Forecasting

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Experimental demonstration of a reconfigurable entangled radiofrequency-photonic sensor network

Experimental demonstration of a reconfigurable entangled rad...

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OSA Quantum 2.0 Conference, QUANTUM 2020

作者： Xia, Yi Li, Wei Clark, William Hart, Darlene Zhuang, Quntao Zhang, Zheshen College of Optical Sciences University of Arizona TucsonAZ85721 United States Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States General Dynamics Mission Systems 8220 East Roosevelt Street ScottsdaleAZ85257 United States General Dynamics Mission Systems 9 Vreeland Road Florham ParkNJ07932 United States Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

We propose and experimentally demonstrate a reconfigurable radiofrequency (RF)-photonic sensor network comprised of three entangled sensor nodes to increase the precision of parameter estimation in networked RF sensin... 详细信息

ISBN: (纸本)9781557528209

关键词： Sensor nodes

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