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Graphene Hinges: Assembly of Foldable 3D Microstructures Using Graphene Hinges (Adv. Mater. 28/2020)

Advanced materials 2020年第28期32卷

作者： Seungyun Lim Haiwen Luan Shiwei Zhao Yongjun Lee Yihui Zhang Yonggang Huang John A. Rogers Jong‐Hyun Ahn School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea Departments of Mechanical Engineering Civil and Environmental Engineering Materials Science and Engineering Northwestern University Evanston IL 60208 USA Querrey Simpson Institute for Bioelectronics Northwestern University Evanston IL 60208 USA School of Aeronautic Science and Engineering Beihang University Beijing 100191 P. R. China Applied Mechanics Laboratory Department of Engineering Mechanics Center for Flexible Electronics Technology Tsinghua University Beijing 100084 P. R. China Departments of Materials Science and Engineering Biomedical Engineering Neurological Surgery Electrical and Computer Engineering Mechanical Engineering Chemistry Northwestern University Evanston IL 60208 USA

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Carbon Nanotubes: Colors of Single-Wall Carbon Nanotubes (Adv. Mater. 8/2021)

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Advanced materials 2021年第8期33卷

作者： Nan Wei Ying Tian Yongping Liao Natsumi Komatsu Weilu Gao Alina Lyuleeva-Husemann Qiang Zhang Aqeel Hussain Er-Xiong Ding Fengrui Yao Janne Halme Kaihui Liu Junichiro Kono Hua Jiang Esko I. Kauppinen Department of Applied Physics Aalto University School of Science Aalto 00076 Finland Department of Physics Dalian Maritime University Dalian 116026 China Department of Electrical and Computer Engineering Rice University Houston TX 77005 USA School of Physics Academy for Advanced Interdisciplinary Studies Collaborative Innovation Center of Quantum Matter Peking University Beijing 100871 China Department of Physics and Astronomy Rice University Houston TX 77005 USA Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA

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Reducing Student Resistance to Active Learning: Strategies for Instructors

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Journal of College science Teaching 2018年第5期47卷 80-91页

作者： Finelli, Cynthia J. Nguyen, Kevin DeMonbrun, Matthew Borrego, Maura Prince, Michael Husman, Jenefer Henderson, Charles Shekhar, Prateek Waters, Cynthia K. Engineering Education Research Program Department of Electrical Engineering and Computer Science School of Education University of Michigan Ann Arbor United States STEM education University of Texas at Austin United States School of Education University of Michigan Ann Arbor United States Center for Engineering Education Department of Mechanical Engineering STEM education University of Texas at Austin United States Chemical Engineering Department Bucknell University in Lewisburg PA United States University of Oregon in Eugene United States Mallinson Institute for Science Education Western Michigan University in Kalamazoo United States Department of Biomedical Engineering University of Michigan in Ann Arbor United States Department of Mechanical Engineering North Carolina A and T State University in Greensboro United States

In spite of considerable evidence of the effectiveness of active learning and other contemporary teaching methods, barriers to adoption of those methods, such as possible student resistance, continue to exist. This study addresses student resistance by analyzing data from 1,051 students who completed our Student Response to Instructional Practices (StRIP) instrument in 18 introductory engineering courses where active learning was implemented. Through descriptive statistics, correlation analyses, and hierarchical linear regression modeling, we demonstrate that students ‘perceptions of their instructors’ use of explanation and facilitation strategies can have a significant impact on student resistance. This study provides a more complete picture of the relative efficacy of these strategies to reduce resistance and confirms that students ‘perceptions of their instructors’ use of these strategies can influence both how students engage with active learning and how students evaluate the course and instructor. We provide evidencebased advice for both new and experienced instructors to reduce student resistance to active learning and other contemporary teaching methods. © 2018 National science Teaching Association.

关键词： Active learning Teaching methods Student attitudes Perceptions

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Universal research index: An inclusive metric to quantify scientific research output

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Journal of Academic Librarianship 2023年第3期49卷

作者： Keshavarz-Fathi, Mahsa Yazdanpanah, Niloufar Kolahchi, Sajad Ziaei, Heliya Darmstadt, Gary L. Dorigo, Tommaso Dochy, Filip Levin, Lisa Thongboonkerd, Visith Ogino, Shuji Chen, Wei-Hsin Perc, Matjaz Tremblay, Mark S. Olusanya, Bolajoko O. Rao, Idupulapati M. Hatziargyriou, Nikos Moradi-Lakeh, Maziar Bella, Federico Rosivall, Laszlo Gandomi, Amir H. Sorooshian, Armin Gupta, Manoj Gal, Ciprian Lozano, Andres M. Weaver, Connie Tanzer, Michael Poggi, Alessandro Sepanlou, Sadaf G. Weiskirchen, Ralf Jambrak, Anet Režek Torres, Pedro J. Capanoglu, Esra Barba, Francisco J. Ernest, Chua Kian Jon Sigman, Mariano Pluchino, Stefano Gharehpetian, Gevork B. Fereshtehnejad, Seyed-Mohammad Yang, Muh-Hwa Thomas, Sabu Cai, Wenju Comini, Elisabetta Scolding, Neil J. Myles, Paul S. Nieto, Juan J. Perry, George Sedikides, Constantine Rezaei, Nima School of Medicine Tehran University of Medical Sciences Tehran Iran Universal Scientific Education and Research Network (USERN) Iran Department of Pediatrics Stanford University School of Medicine Stanford CA United States Istituto Nazionale di Fisica Nucleare (INFN) Via Francesco Marzolo Sezione di Padova Italy High Impact Learning Academy Learning and Development Department Brussels Belgium Center for Marine Biodiversity and Conservation Integrative Oceanography Division Scripps Institution of Oceanography University of California San Diego San Diego CA United States Medical Proteomics Unit Office for Research and Development Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand Department of Epidemiology Harvard T.H. Chan School of Public Health Boston MA United States Program in MPE Molecular Pathological Epidemiology Department of Pathology Brigham and Women's Hospital and Harvard Medical School Boston MA United States Broad Institute of MIT and Harvard Cambridge MA United States Department of Aeronautics and Astronautics National Cheng Kung University Tainan Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung 407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung 411 Taiwan Faculty of Natural Sciences and Mathematics University of Maribor Maribor Slovenia Department of Medical Research China Medical University Hospital China Medical University Taichung Taiwan Complexity Science Hub Vienna Vienna Austria Alma Mater Europaea Maribor Slovenia Children's Hospital of Eastern Ontario Research Institute Department of Pediatrics University of Ottawa Ottawa ON Canada Centre for Healthy Start Initiative Ikoyi Lagos Nigeria Alliance of Bioversity International International Center for Tropical Agriculture Cali Colombia International Centre of Insect Physiology and Ecology (ICIPE) Nairobi Kenya School of Electrical and Computer Engineering Natio

Scientometrics and bibliometrics, the subfields of library and information science, deal with the quantity and quality of research outputs. Currently, various scientometric indices are being used to quantify and compare research outputs. The most widely known is the h-index. However, this index and its derivatives suffer from dependence on the mere count of a scholar's highly cited publications. To remedy this deficiency, we developed a novel index, the Universal Research Index (UR-Index) (https://***/UR-Index/) by which every single publication has its own impact on the total score. We developed this index by surveying international top 1 % cited scientists in various disciplines and included additional component variables such as publication type, leading role of a scholar, co-author count, and source metrics to this scientometric index. We acknowledge that unconscious biases built into the component variables included in the UR-Index might put research from specific groups at a disadvantage, thus continued efforts to improve equitable scholarly impact in science and academia are encouraged. © 2023 Elsevier Inc.

关键词： Citations CiteScore h-index Impact factor Leading author Research impact Scholarly impact Scholarly output Scientometrics UR-Index USERN

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Tuning Insulator-Semimetal Transitions in 3D Topological Insulator thin Films by Intersurface Hybridization and In-Plane Magnetic Fields

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Physical Review Letters 2019年第20期123卷 207701-207701页

作者： Yang Xu Guodong Jiang Ireneusz Miotkowski Rudro R. Biswas Yong P. Chen Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA Birck Nanotechnology Center Purdue University West Lafayette Indiana 47907 USA Purdue Quantum Science and Engineering Institute Purdue University West Lafayette Indiana 47907 USA School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA WPI-AIMR International Research Center for Materials Sciences Tohoku University Sendai 980-8577 Japan

A pair of Dirac points (analogous to a vortex-antivortex pair) associated with opposite topological numbers (with ±π Berry phases) can be merged together through parameter tuning and annihilated to gap the Dirac spectrum, offering a canonical example of a topological phase transition. Here, we report transport studies on thin films of BiSbTeSe2, which is a 3D topological insulator that hosts spin-helical gapless (semimetallic) Dirac fermion surface states for sufficiently thick samples, with an observed resistivity close to h/4e2 at the charge neutral point. When the sample thickness is reduced to below ∼10 nm thick, we observe a transition from metallic to insulating behavior, consistent with the expectation that the Dirac cones from the top and bottom surfaces hybridize (analogous to a “merging” in the real space) to give a trivial gapped insulator. Furthermore, we observe that an in-plane magnetic field can drive the system again towards a metallic behavior, with a prominent negative magnetoresistance (up to ∼−95%) and a temperature-insensitive resistivity close to h/2e2 at the charge neutral point. The observation is consistent with a predicted effect of an in-plane magnetic field to reduce the hybridization gap (which, if small enough, may be smeared by disorder and give rise to a metallic behavior). A sufficiently strong magnetic field is predicted to restore and split again the Dirac points in the momentum space, inducing a distinct 2D topological semimetal phase with two single-fold Dirac cones of opposite spin-momentum windings.

关键词： electrical conductivity Electronic structure Magnetoresistance Magnetotransport Metal-insulator transition Surface states Topological insulators Topological phases of matter

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Linear and Nonlinear Reconstruction Algorithms for Atomic-Resolution Tomography Using Phase Contrast Electron Microscopy

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Microscopy and Microanalysis 2018年第S1期24卷 110-111页

作者： Colin Ophus David Ren Michael Chen Catherine Groschner Mary Scott Laura Waller Molecular Foundry Lawrence Berkeley National Laboratory Berkeley USA Department of Electrical Engineering and Computer Science UC Berkeley Berkeley CA Materials Science and Engineering UC Berkeley Berkeley CA

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Title: Observation of Bloch-Siegert Shift in an Atomically Thin Crystal

Title: Observation of Bloch-Siegert Shift in an Atomically T...

引用

2018 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2018

作者： Sie, Edbert J. Lui, C.H. Lee, Yi-Hsien Fu, Liang Kong, Jing Gedik, Nuh Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy University of California RiversideCA92521 United States Materials Science and Engineering National Tsing-Hua University Hsinchu30013 Taiwan Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Geballe Laboratory for Advanced Materials Stanford University StanfordCA94305 United States

ISBN: (纸本)9781538653432

Coherent light-matter interaction can be used to manipulate the energy levels of atoms, molecules and solids. When light with frequency ω is detuned away from a resonance ω0, repulsion between the photon-dressed (Floquet) states can lead to a shift of energy resonance. The dominant effect is the optical Stark shift (∝ 1/( ω0-ω)), but there is an additional contribution from the so-called Bloch-Siegert shift (∝ 1/( ω0 + ω)). Although it is common in atoms and molecules, the observation of Bloch-Siegert shift in solids has so far been limited only to artificial atoms since the shifts were small (2 under infrared optical driving by virtue of the strong light-matter interaction in this system. Moreover, we can disentangle the Bloch-Siegert shift entirely from the optical Stark shift, because the two effects are found to obey opposite selection rules at different valleys. By controlling the light helicity, we can confine the Bloch-Siegert shift to occur only at one valley, and the optical Stark shift at the other valley. Such a valley-exclusive Bloch-Siegert shift allows for enhanced control over the valleytronic properties in two-dimensional materials, and offers a new avenue to explore quantum optics in solids. © 2018 IEEE.

关键词： Molecules

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Photoluminescence mapping and time-domain thermo-photoluminescence for rapid imaging and measurement of thermal conductivity of boron arsenide

arXiv

引用

arXiv 2019年

作者： Yue, Shuai Gamage, Geethal Amila Mohebinia, Mohammadjavad Mayerich, David Talari, Vishal Deng, Yu Tian, Fei Dai, Shen-Yu Sun, Haoran Hadjiev, Viktor G. Zhang, Wei Feng, Guoying Hu, Jonathan Liu, Dong Wang, Zhiming Ren, Zhifeng Bao, Jiming Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu Sichuan610054 China Department of Electronic and Computer Engineering University of Houston HoustonTX77204 United States Department of Physics Texas Center for Superconductivity University of Houston HoustonTX77204 United States Materials Science & Engineering University of Houston HoustonTX77204 United States Department of Mechanical Engineering University of Houston HoustonTX77204 United States College of Electronics & Information Engineering Sichuan University Chengdu Sichuan610064 China Texas Center for Superconductivity University of Houston HoustonTX77204 United States Department of Electrical and Computer Engineering Baylor University WacoTX76798 United States

Cubic boron arsenide (BAs) is attracting greater attention due to the recent experimental demonstration of ultrahigh thermal conductivity K above 1000 W/m·K. However, its bandgap has not been settled and a simple yet effective method to probe its crystal quality is missing. Furthermore, traditional K measurement methods are destructive and time consuming, thus they cannot meet the urgent demand for fast screening of high K materials. After we experimentally established 1.82 eV as the indirect bandgap of BAs and observed room-temperature band-edge photoluminescence, we developed two new optical techniques that can provide rapid and non-destructive characterization of K with little sample preparation: photoluminescence mapping (PL-mapping) and time-domain thermo-photoluminescence (TDTP). PL-mapping provides nearly real-time image of crystal quality and K over mm-sized crystal surfaces;while TDTP allows us to pick up any spot on the sample surface and measure its K using nanosecond laser pulses. These new techniques reveal that the apparent single crystals are not only non-uniform in K, but also are made of domains of very distinct K. Because PL-mapping and TDTP are based on the band-edge PL and its dependence on temperature, they can be applied to other semiconductors, thus paving the way for rapid identification and development of high-K semiconducting materials. Copyright © 2019, The Authors. All rights reserved.

关键词： Photoluminescence

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Organic Semiconductors: Fast‐Response, Highly Air‐Stable, and Water‐Resistant Organic Photodetectors Based on a Single‐Crystal Pt Complex (Adv. Mater. 2/2020)

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Advanced materials 2020年第2期32卷

作者： Dharmaraj Periyanagounder Tzu‐Chiao Wei Ting‐You Li Chun‐Ho Lin Théo Piechota Gonçalves Hui‐Chun Fu Dung‐Sheng Tsai Jr‐Jian Ke Hung‐Wei Kuo Kuo‐Wei Huang Norman Lu Xiaosheng Fang Jr‐Hau He Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science & Technology Thuwal 23955–6900 Saudi Arabia Department of Molecular Science and Engineering National Taipei University of Technology Taipei 106 Taiwan ROC KAUST Catalyst Centre Physical Science and Engineering Division King Abdullah University of Science & Technology Thuwal 23955–6900 Saudi Arabia Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei 106 Taiwan ROC Department of Materials Science Fudan University Shanghai 200433 China Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong SAR 999077 China

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arXiv

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arXiv 2019年

作者： Burg, G. William Zhu, Jihang Taniguchi, Takashi Watanabe, Kenji MacDonald, Allan H. Tutuc, Emanuel Microelectronics Research Center Department of Electrical and Computer Engineering University of Texas at Austin AustinTX78758 United States Department of Physics University of Texas at Austin AustinTX78712 United States National Institute of Materials Science 1-1 Namiki Tsukuba Ibaraki305-0044 Japan

We present a combined experimental and theoretical study of twisted double bilayer graphene with twist angles between 1° and 1.35°. Consistent with moiré band structure calculations, we observe insulators at integer moiré band fillings one and three, but not two. An applied transverse electric field separates the first moiré conduction band from neighbouring bands, and favors the appearance of correlated insulators at 1/4, 1/2, and 3/4 band filling. Insulating states at 1/4 and 3/4 band filling emerge only in a parallel magnetic field (B||), whereas the resistance at half band filling is weakly dependent on B||. These findings suggest that correlated insulators are favored when a moiré flat band is spectrally isolated, with spin polarization at 1/4 and 3/4 band filling and valley polarization at 1/2 band filling. Copyright © 2019, The Authors. All rights reserved.

关键词： Graphene

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