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arXiv 2020年

作者： Nguyen, Kayla X. Jiang, Yi Cao, Michael C. Purohit, Prafull Yadav, Ajay K. García-Fernández, Pablo Tate, Mark W. Chang, Celesta S. Aguado-Puente, Pablo Íñiguez, Jorge Gomez-Ortiz, Fernando Gruner, Sol M. Junquera, Javier Martin, Lane W. Ramesh, Ramamoorthy Muller, D.A. Department of Chemistry and Chemical Biology Cornell University IthacaNY United States Department of Physics Cornell University IthacaNY United States School of Applied and Engineering Physics Cornell University IthacaNY United States Department of Electrical Engineering and Computer Sciences University of California United States Departamento de Ciencias de la Tierra y Física de la Materia Condensada Universidad de Cantabria Cantabria Campus Internacional Avenida de los Castros s/n Santander39005 Spain Atomistic Simulation Center Queen's University Belfast BelfastBT7 1NN United Kingdom 5 avenue des Hauts-Fourneaux Esch/AlzetteL-4362 Luxembourg Physics and Materials Science Research Unit University of Luxembourg 41 Rue du Brill BelvauxL-4422 Luxembourg Kavli Institute at Cornell for Nanoscale Science IthacaNY United States Cornell University IthacaNY United States Department of Material Science and Engineering University of California Berkeley BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics University of California BerkeleyCA94270 United States

Orbital angular momentum and torque transfer play central roles in a wide range of magnetic textures and devices including skyrmions and spin-torque electronics(1-4). Analogous topological structures are now also being explored in ferroelectrics, including polarization vortex arrays in ferroelectric/dielectric superlattices(5). Unlike magnetic toroidal order, electric toroidal order does not couple directly to linear external fields. To develop a mechanism that can control switching in polarization vortices, we utilize a high-energy electron beam and show that transverse currents are generated by polar order in the ballistic limit. We find that the presence of an electric toroidal moment in a ferro-rotational phase transfers a measurable torque and orbital angular momentum to the electron beam. Furthermore, we find that the complex polarization patterns, observed in these heterostructures, are microscopically chiral with a non-trivial axial component of the polarization. This chirality opens the door for the coupling of ferroelectric and optical properties. © 2020, CC0.

关键词： Electron beams

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Molecular monolayer stabilizer for multilayer 2D materials

arXiv

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arXiv 2019年

作者： Su, Cong Yin, Zongyou Yan, Qing-Bo Wang, Zegao Lin, Hongtao Sun, Lei Xu, Wenshuo Yamada, Tetsuya Ji, Xiang Zettsu, Nobuyuki Teshima, Katsuya Warner, Jamie H. Dincă, Mircea Hu, Juejun Dong, Mingdong Su, Gang Kong, Jing Li, Ju Department of Nuclear and Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Massachusetts Institutes of Technology CambridgeMA02139 United States Research School of Chemistry Australian National University CanberraACT2601 Australia College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China Aarhus University Aarhus8000 Denmark Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Chemistry Massachusetts Institutes of Technology CambridgeMA02139 United States Department of Materials University of Oxford OX1 3PH United Kingdom Center for Energy and Environmental Science Shinshu University 4-17-1 Wakasato Nagano380-8553 Japan Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States School of Physical Science University of Chinese Academy of Sciences Beijing100049 China

2D van der Waals materials have rich and unique functional properties, but many are susceptible to corrosion under ambient conditions. Here we show that linear alkylamines n-CmH2m+1NH2, with m = 4 to 11, are highly effective in protecting the optoelectronic properties of these materials such as black phosphorous (BP) and transition metal dichalcogenides (TMDs: WS2, 1T’-MoTe2, WTe2, WSe2, TaS2, and NbSe2). As a representative example, n-hexylamine (m = 6) can be applied in the form of thin molecular monolayers on BP flakes with less-than-2nm thickness and can prolong BP’s lifetime from a few hours to several weeks and even months in ambient environments. Characterizations combined with our theoretical analysis show that the thin monolayers selectively sift out water molecules, forming a drying layer to achieve the passivation of the protected 2D materials. The monolayer coating is also stable in air, H2 annealing, and organic solvents, but can be removed by certain organic acids. Copyright © 2019, The Authors. All rights reserved.

关键词： Tungsten compounds

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Retracted: Sylabus and Matrials Design for Vocational Student and Its Dissemination Using Website

Retracted: Sylabus and Matrials Design for Vocational Studen...

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2018 Workshop on Multidisciplinary and Its Applications: Applied Mathematics, computer science, Information Systems, and Information Technology, WMA-Mathcomtech 2018

作者： Harahap, Astro Julida Ongko, Erianto Manurung, Hotler Kurnia, Dian Hartono, H. Abdullah, Dahlan Erliana, Cut Ita Djanggih, Hardianto Saddhono, Kundharu Rianita, Dian Setiawan, Muhammad Ikhsan Setiawan, Yuliyanto Budi Manurung, Rosida Tiurma Sriadhi, S. Sinurat, Mangasi Siregar, Aisyah Soni Hutauruk, Rapat Piter Sibarani, Nico Benjamain Department of Informatics Akademi Teknologi Industri Immanuel Medan Indonesia Department of Computer Systems Universitas Pancabudi Medan Indonesia Department of Computer Science STMIK IBBI Medan Indonesia Department of Informatics Universitas Malikussaleh Aceh Indonesia Department of Industrial Engineering Universitas Malikussaleh Aceh Indonesia Department of Law Universitas Tompotika Luwuk Banggai Indonesia Graduate Program Universitas Sebelas Maret Surakarta Indonesia Department of Administration University of Lancang Kuning Pekanbaru Indonesia Department of Civil Engineering Narotama University Surabaya Indonesia Study Program of Communication Studies Universitas Semarang Indonesia Graduate Program in Scientific Psychology Universitas Kristen Maranatha Indonesia Department of Electrical Engineering Universitas Negeri Medan Indonesia STIE Bina Karya Tebing Tinggi Indonesia

The learners' needs are an important factor in designing syllabus and materials design, this research deals with the syllabus and material design based on the professional's needs. It is expected that the syllabus and materials designes are communicatively applicable to the professional academy. Descriptive method is applied in this research. The sample of this research is 30 students of ATII Immanuel Academy Medan. They were selected by random sampling to get the data, the questioners were administered to students. the questioners consisted of 54 items and the semi structured interview consisted of 5 questions, the finding indicated that learners' needs were focused on reading and speaking skills. With reference appropriately and proportionally derived for students of the Professional Academy. Further on the basis of the syllabus, materials are designed in which the skills of using language become a priority. The results of this research will be disseminated using the website. © Published under licence by IOP Publishing Ltd.

关键词： Information systems

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Authors’ Response to Peer Reviews of “Emergence of the First Strains of SARS-CoV-2 Lineage B.1.1.7 in Romania: Genomic Analysis”

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JMIRx Med 2021年第3期2卷

作者： Andrei Lobiuc Mihai Dimian Olga Sturdza Roxana Filip Mihai Covasa Department of Human Health and Development College of Physical Exercise and Sport Stefan cel Mare University of Suceava Suceava Romania Department of Computers Electronics and Automation College of Electrical Engineering and Computer Science Stefan cel Mare University of Suceava Suceava Romania Integrated Center for Research Development and Innovation in Advanced Materials Nanotechnologies and Distributed Systems for Fabrication and Control Stefan cel Mare University of Suceava Suceava Romania Suceava County Emergency Hospital Suceava Romania

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Current-induced domain wall motion in compensated ferrimagnet

arXiv

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arXiv 2018年

作者： Siddiqui, Saima A. Han, Jiahao Finley, Joseph T. Ross, Caroline A. Liu, Luqiao Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States

Due to the difficulty in detecting and manipulating magnetic states of antiferromagnetic materials, studying their switching dynamics using electrical methods remains a challenging task. In this work, by employing heavy metal/rare earth-transition metal alloy bilayers, we experimentally studied current-induced domain wall dynamics in an antiferromagnetically coupled system. We show that the current-induced domain wall mobility reaches a maximum close to the angular momentum compensation. With experiment and modelling, we further reveal the internal structures of domain walls and the underlying mechanisms for their fast motion. We show that the chirality of the ferrimagnetic domain walls remains the same across the compensation points, suggesting that spin orientations of specific sublattices rather than net magnetization determine Dzyaloshinskii-Moriya interaction in heavy metal/ferrimagnet bilayers. The high current-induced domain wall mobility and the robust domain wall chirality in compensated ferrimagnetic material opens new opportunities for high-speed spintronic devices. Copyright © 2018, The Authors. All rights reserved.

关键词： Ferrimagnetism

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Mechanistic insight into the limiting factors of graphene-based environmental sensors

arXiv

引用

arXiv 2019年

作者： Guay, Jean-Michel Rautela, Ranjana Scarfe, Samantha Lazar, Petr Azimi, Saied Grenapin, Cedric Halpin, Alexei Wang, Weixiang Andrzejewski, Lukasz Plumadore, Ryan Park, Jeongwon Otyepka, Michal Ménard, Jean-Michel Luican-Mayer, Adina Department of Physics University of Ottawa OttawaONK1N 9A7 Canada School of Electrical Engineering and Computer Science University of Ottawa OttawaONK1N 6N5 Canada Regional Centre of Advanced Technologies and Materials Faculty of Science Palacky University Olomouc Slechtitelu 27 Olomouc771 46 Czech Republic

Graphene has demonstrated great promise for technological use, yet control over material growth and understanding of how material imperfections affect the performance of devices are challenges that hamper the development of applications. In this work we reveal new insight into the connections between the performance of the graphene devices as environmental sensors and the microscopic details of the interactions at the sensing surface. Specifically, we monitor changes in the resistance of the chemical-vapour deposition grown graphene devices as exposed to different concentrations of ethanol. We perform thermal surface treatments after the devices are fabricated, use scanning probe microscopy to visualize their effects on the graphene sensing surface down to nanometer scale and correlate them with the measured performance of the device as an ethanol sensor. Our observations are compared to theoretical calculations of charge transfers between molecules and the graphene surface. We find that, although often overlooked, the surface cleanliness after device fabrication is responsible for the device performance and reliability. These results further our understanding of the mechanisms of sensing in graphene-based environmental sensors and pave the way to optimizing such devices, especially for their miniaturization, as with decrising size of the active zone the potential role of contaminants will rise. Copyright © 2019, The Authors. All rights reserved.

关键词： Graphene

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Supercharge optical arrays

arXiv

引用

arXiv 2018年

作者： Midya, Bikashkali Walasik, Wiktor Litchinitser, Natalia M. Feng, Liang Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States

We introduce the notion of a supercharge optical array synthesized according to supersymmetric charge operators. Starting from an arbitrary array, mathematical supersymmetry transformation can be used systematically to create a zero-energy physical state below the ground state of the super-partner array. This zero mode, which is pinned deep in the midgap of the corresponding supercharge array owing to the square-root spectral relationship between a supercharge and a super-Hamiltonian array, is shown to be protected because of the chiral symmetry inherent to a supercharge array. A supercharge array can be used in practical applications to design a discrete optical system of waveguides or coupled resonators where the mid-gap zero mode facilitates robust light dynamics either in spatial or time domain. Copyright © 2018, The Authors. All rights reserved.

关键词： Ground state

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The launch of BMC materials

引用

BMC materials 2019年第1期1卷 1-5页

作者： Harriet E. Manning Pedro Barquinha Rodrigo Martins Wenguo Cui Drew Evans Emmanuel Kymakis Haiyan Wang Ehrenfried Zschech Springer Nature 4 Crinan Street London N1 9XW UK Department of Materials Science Universidade NOVA de Lisboa Lisbon Portugal Shanghai Institute of Traumatology and Orthopaedics Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai China Future Industries Institute University of South Australia Adelaide Australia Department of Electrical & Computer Engineering Hellenic Mediterranean University Heraklion Crete Greece School of Materials Engineering Purdue University West Lafayette USA Fraunhofer Institute for Ceramic Technologies and Systems Dresden Germany

BMC materials is a new, community-focussed venue for all publishable research across the broad discipline of materials science. It joins the mature and reputable BMC Series of journals, adhering to the same standards ...

BMC materials is a new, community-focussed venue for all publishable research across the broad discipline of materials science. It joins the mature and reputable BMC Series of journals, adhering to the same standards of publishing and the ethos of open research set by the Series. Together with its sister journals BMC Chemical engineering, BMC Biomedical engineering, BMC Energy and BMC Chemistry, BMC materials furthers the BMC Series’ expansion into the physical sciences and engineering.

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The international magnetics Conference (INTERMAG) 2018 publication chairs' preface

2018 IEEE International Magnetic Conference, INTERMAG 2018

引用

2018 IEEE International Magnetic Conference, INTERMAG 2018 2018年

作者： Andrei, Petru Wei, Dan Department of Electrical and Computer Engineering Florida State University and Florida AandM University TallahasseeFL United States Department of Materials Science and Engineering Tsinghua University Beijing China

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materials discovery and design principles for stable, high activity perovskite cathodes for solid oxide fuel cells

arXiv

引用

arXiv 2018年

作者： Jacobs, Ryan Mayeshiba, Tam Booske, John Morgan, Dane Department of Materials Science and Engineering University of Wisconsin- Madison MadisonWI United States Department of Electrical and Computer Engineering University of Wisconsin- Madison MadisonWI United States

Critical to the development of improved solid oxide fuel cell (SOFC) technology are novel compounds with high oxygen reduction reaction (ORR) catalytic activity and robust stability under cathode operating conditions. We have screened approximately 2145 distinct perovskite compositions for potential use as high activity, stable SOFC cathodes, and have verified that our screening methodology qualitatively reproduces the experimental activity, stability, and conduction properties of well-studied cathode materials. We used the calculated oxygen p-band center as a first principles-based descriptor of the surface exchange coefficient (k*), which in turn correlates with cathode ORR activity. We used convex hull analysis under operating conditions in the presence of oxygen, hydrogen, and water vapor to determine thermodynamic stability. This search has yielded 52 potential cathode materials with good predicted stability in typical SOFC operating conditions and predicted k* on par with leading ORR perovskite catalysts. We also used our established trends in predicted k* and stability to suggest methods of improving the performance of known promising compounds. The materials design strategies and new materials discovered in our computational search will help enable the development of high activity, stable compounds for use in future solid oxide fuel cells and related applications. Copyright © 2018, The Authors. All rights reserved.

关键词： Solid oxide fuel cells (SOFC)

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