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arXiv 2019年

作者： Jin, Chenhao Regan, Emma C. Wang, Danqing Iqbal Bakti Utama, M. Yang, Chan-Shan Cain, Jeffrey Qin, Ying Shen, Yuxia Zheng, Zhiren Watanabe, Kenji Taniguchi, Takashi Tongay, Sefaattin Zettl, Alex Wang, Feng Department of Physics University of California at Berkeley BerkeleyCA94720 United States Graduate Group in Applied Science and Technology University of California at Berkeley BerkeleyCA94720 United States Department of Materials Science and Engineering University of California at Berkeley BerkeleyCA94720 United States Institute of Electro-Optical Science and Technology Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei11677 Taiwan Material Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Kavli Energy NanoSciences Institute University of California Berkeley Lawrence Berkeley National Laboratory BerkeleyCA94720 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan

Moiré superlattices provide a powerful way to engineer properties of electrons and excitons in two-dimensional van der Waals heterostructures1-11. The moiré effect can be especially strong for interlayer excitons, where electrons and holes reside in different layers and can be addressed separately. In particular, it was recently proposed that the moiré superlattice potential not only localizes interlayer exciton states at different superlattice positions, but also hosts an emerging moiré quasi-angular momentum (QAM) that periodically switches the optical selection rules for interlayer excitons at different moiré sites12,13. Here we report the observation of multiple interlayer exciton states coexisting in a WSe2/WS2 moiré superlattice and unambiguously determine their spin, valley, and moiré QAM through novel resonant optical pump-probe spectroscopy and photoluminescence excitation spectroscopy. We demonstrate that interlayer excitons localized at different moiré sites can exhibit opposite optical selection rules due to the spatially-varying moiré QAM. Our observation reveals new opportunities to engineer interlayer exciton states and valley physics with moiré superlattices for optoelectronic and valleytronic applications. Copyright © 2019, The Authors. All rights reserved.

关键词： Angular momentum

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Jammed packings of 3D superellipsoids with tunable packing fraction, contact number, and ordering

arXiv

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arXiv 2019年

作者： Yuan, Ye VanderWerf, Kyle Shattuck, Mark D. O’Hern, Corey S. Department of Mechanics and Engineering Science College of Engineering Peking University Beijing100871 China Department of Mechanical Engineering and Materials Science Yale University New HavenCT06520 United States Department of Physics Yale University New HavenCT06520 United States Benjamin Levich Institute and Physics Department City College of New York New YorkNY10031 United States Department of Applied Physics Yale University New HavenCT06520 United States Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States

We carry out numerical studies of static packings of frictionless superellipsoidal particles in three spatial dimensions. We consider more than 200 different particle shapes by varying the three shape parameters that define superellipsoids. We characterize the structural and mechanical properties of both disordered and ordered packings using two packing-generation protocols. We perform athermal quasi-static compression simulations starting from either random, dilute configurations (Protocol 1) or thermalized, dense configurations (protocol 2), which allows us to tune the orientational order of the packings. In general, we find that the contact numbers at jamming onset for superellipsoid packings are hypostatic, with zJ f and df = 5 or 6 depending on whether the particles are axi-symmetric or not. Over the full range of orientational order, we find that the number of quartic modes of the dynamical matrix for the packings always matches the number of missing contacts relative to the isostatic value. This result suggests that there are no mechanically redundant contacts for ordered, yet hypostatic packings of superellipsoidal particles. Additionally, we find that the packing fraction at jamming onset for diordered packings of superellipsoidal particles can be collapsed using two particle shape parameters, e.g. the asphericity A and reduced aspect ratio β of the particles. Copyright © 2019, The Authors. All rights reserved.

关键词： Jamming

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engineering chirality at wafer scale with ordered carbon nanotube architectures

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Nature communications 2023年第1期14卷 7380页

作者： Jacques Doumani Minhan Lou Oliver Dewey Nina Hong Jichao Fan Andrey Baydin Keshav Zahn Yohei Yomogida Kazuhiro Yanagi Matteo Pasquali Riichiro Saito Junichiro Kono Weilu Gao Department of Electrical and Computer Engineering Rice University Houston TX USA. Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA. Department of Electrical and Computer Engineering The University of Utah Salt Lake City UT USA. Carbon Hub Rice University Houston TX USA. Department of Chemical and Biomolecular Engineering Rice University Houston TX USA. J.A. Woollam Co. Inc. Lincoln NE USA. Smalley-Curl Institute Rice University Houston TX USA. Department of Physics Tokyo Metropolitan University Tokyo Japan. Department of Chemistry Rice University Houston TX USA. Department of Materials Science and NanoEngineering Rice University Houston TX USA. Department of Physics Tohoku University Sendai Japan. Department of Physics National Taiwan Normal University Taipei Taiwan. Department of Physics and Astronomy Rice University Houston TX USA. Department of Electrical and Computer Engineering The University of Utah Salt Lake City UT USA. weilu.gao@utah.edu. Carbon Hub Rice University Houston TX USA. weilu.gao@utah.edu.

Creating artificial matter with controllable chirality in a simple and scalable manner brings new opportunities to diverse areas. Here we show two such methods based on controlled vacuum filtration - twist stacking and mechanical rotation - for fabricating wafer-scale chiral architectures of ordered carbon nanotubes (CNTs) with tunable and large circular dichroism (CD). By controlling the stacking angle and handedness in the twist-stacking approach, we maximize the CD response and achieve a high deep-ultraviolet ellipticity of 40 ± 1 mdeg nm. Our theoretical simulations using the transfer matrix method reproduce the experimentally observed CD spectra and further predict that an optimized film of twist-stacked CNTs can exhibit an ellipticity as high as 150 mdeg nm, corresponding to a g factor of 0.22. Furthermore, the mechanical rotation method not only accelerates the fabrication of twisted structures but also produces both chiralities simultaneously in a single sample, in a single run, and in a controllable manner. The created wafer-scale objects represent an alternative type of synthetic chiral matter consisting of ordered quantum wires whose macroscopic properties are governed by nanoscopic electronic signatures and can be used to explore chiral phenomena and develop chiral photonic and optoelectronic devices.

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Curved copper nanowires-based robust flexible transparent electrodes via all-solution approach

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Nano Research 2017年第9期10卷 3077-3091页

作者： Zhenxing Yin Seung Keun Song Sanghun Cho Duck-Jae You Jeeyoung Yoo Suk Tai Chang Youn Sang Kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 08826 Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang University Seou106974 Republic of Korea Advanced Institutes of Convergence Technology 145 Gwanggyo-ro Yeongtong-gu Suwon-si Gyeonggi-do 16229 Republic of Korea

Curved Cu nanowire (CCN)-based high-performance flexible transparent conductive electrodes (FTCEs) were fabricated via a fully solution-processed approach, involving synthesis, coating, patterning, welding, and transfer. Each step involved an innovative technique for completing the all-solution processes. The high-quality and well-dispersed CCNs were synthesized using a multi-polyol method through the synergistic effect of specific polyol reduction. To precisely control the optoelectrical properties of the FTCEs, the CCNs were uniformly coated on a polyimide (PI) substrate via a simple meniscus-dragging deposition method by tuning several coating parameters. We also employed a polyurethane (PU)-stamped patterning method to effectively produce 20 μm patterns on CCN thin films. The CCN thin films exhibited high electrical performance, which is attributed to the deeply percolated CCN network formed via a solvent-dipped welding method. Finally, the CCN thin films on the PI substrate were partially embedded and transferred to the PU matrix to reduce their surface roughness. Through consecutive processes involving the proposed methods, a highly percolated CCN thin film on the PU matrix exhibited high optoelectrical performance (R s = 53.48 Ω/□ at T = 85.71%), excellent mechanical properties (R/R 0 < 1.10 after the 10th repetition of tape peeling or 1,000 bending cycles), and a low root-mean-square surface roughness (R rms = 14.36 nm).

关键词： curved Cu nanowires all-solution processes 20 μm patterns high performance transparent electrode

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Kramers nodal lines in intercalated TaS2 superconductors

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Nature Communications 2025年第1期16卷 1-10页

作者： Zhang, Yichen Gao, Yuxiang Pulkkinen, Aki Guo, Xingyao Huang, Jianwei Guo, Yucheng Yue, Ziqin Oh, Ji Seop Moon, Alex Oudah, Mohamed Gao, Xue-Jian Marmodoro, Alberto Fedorov, Alexei Mo, Sung-Kwan Hashimoto, Makoto Lu, Donghui Rajapitamahuni, Anil Vescovo, Elio Kono, Junichiro Hallas, Alannah M. Birgeneau, Robert J. Balicas, Luis Minár, Ján Hosur, Pavan Law, Kam Tuen Morosan, Emilia Yi, Ming Department of Physics and Astronomy Rice University Houston 77005 TX United States New Technologies Research Center University of West Bohemia Plzen 301 00 Czech Republic Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston 77005 TX United States Smalley-Curl Institute Rice University Houston 77005 TX United States Department of Physics University of California Berkeley Berkeley 94720 CA United States National High Magnetic Field Laboratory Tallahassee Tallahassee 32310 FL United States Physics Department Florida State University Tallahassee 32306 FL United States Stewart Blusson Quantum Matter Institute University of British Columbia Vancouver Vancouver V6T 1Z4 BC Canada Advanced Light Source Lawrence Berkeley National Laboratory Berkeley Berkeley 94720 CA United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park 94025 CA United States National Synchrotron Light Source II Brookhaven National Lab Upton 11973 NY United States Rice Center for Quantum Materials Rice University Houston 77005 TX United States Department of Electrical and Computer Engineering Rice University Houston 77005 TX United States Department of Materials Science and NanoEngineering Rice University Houston 77005 TX United States Department of Physics & Astronomy University of British Columbia Vancouver Vancouver V6T 1Z1 BC Canada Canadian Institute for Advanced Research Toronto Toronto M5G 1M1 ON Canada Materials Science Division Lawrence Berkeley National Laboratory Berkeley Berkeley 94720 CA United States Department of Physics and Texas Center for Superconductivity University of Houston Houston 77204 TX United States

Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines (KNLs), anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal KNLs well isolated at the Fermi level is lacking. Here, we establish a class of noncentrosymmetric achiral intercalated transition metal dichalcogenide superconductors with large Ising-type spin-orbit coupling, represented by InxTaS2, to host an ideal KNL phase. We provide evidence from angle-resolved photoemission spectroscopy with spin resolution, angle-dependent quantum oscillation measurements, and ab-initio calculations. Our work not only provides a realistic platform for realizing and tuning KNLs in layered materials, but also paves the way for exploring the interplay between KNLs and superconductivity, as well as applications pertaining to spintronics, valleytronics, and nonlinear transport. © The Author(s) 2025.

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Anti-Inflammatory Glycosides from Gomphandra mollis Merr.: Structural Elucidation and Mechanistic Insights

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Phytochemistry 2025年 114583页

作者： Quoc-Dung Tran Huynh Thuy-Tien Thi Phan Man-Hsiu Chu Thanh-Vu Nguyen Truc-Ly Thi Duong Su-Jung Hsu Yun-Han Wang Ngoc-Thac Pham Bien-Thuy Nguyen Bui Dang-Khoa Nguyen Thanh-Hoa Vo Ta-Wei Liu Ching-Kuo Lee Ph.D. Program in Clinical Drug Development of Herbal Medicine College of Pharmacy Taipei Medical University Taipei 11031 Taiwan Institute of Pharmaceutical Education and Research Binh Duong University Thu Dau Mot 820000 Binh Duong Vietnam Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Taipei 11031 Taiwan School of Pharmacy College of Pharmacy Taipei Medical University Taipei 11042 Taiwan Biotechnology Center Of Ho Chi Minh City Ho Chi Minh 700000 Vietnam Faculty of Traditional medicine Can Tho University of Medicine and Pharmacy Can Tho 900000 Vietnam Faculty of Pharmacy Can Tho University of Medicine and Pharmacy Can Tho 900000 Vietnam Institute of Fisheries Science National Taiwan University Taipei 106 Taiwan National Research Institute of Chinese Medicine Ministry of Health and Welfare Taipei 11221 Taiwan University of Health Sciences Vietnam National University Ho Chi Minh City Ho Chi Minh 700000 Vietnam School of Pharmacy University of Medicine and Pharmacy at Ho Chi Minh City Ho Chi Minh City 700000 Vietnam Center for Discovery and Development of Healthcare Product Vietnam National University Ho Chi Minh City Ho Chi Minh 700000 Vietnam Institute of Pharmaceutical Sciences Department of Pharmacognosy University of Graz Universitätsplatz 4 8010 Graz Austria Graduate Institute of Pharmacognosy College of Pharmacy Taipei Medical University Taipei 11042 Taiwan Department of Chemistry Chung Yuan Christian University Zhongli District Taoyuan 32023 Taiwan

Eight previously unreported glycosides, designated gomphandranosides I–VIII, along with nine known compounds, were isolated from the roots of Gomphandra mollis Merr. Their structures were elucidated through comprehensive spectroscopic analyses, including NMR, HR-ESI-MS, CD, DP4+ probability, and ECD calculations. The anti-inflammatory activities of the isolated compounds were assessed using nitric oxide inhibition assays in LPS-stimulated RAW264.7 macrophages. Compounds 5 , 10 , and 16 exhibited significant anti-inflammatory activity with IC 50 values of 7.56 ± 0.9, 15.0 ± 1.2, and 14.2 ± 0.9 μM, respectively. Network pharmacology, gene ontology, Kyoto Encyclopedia of Genes and Genomes analysis, and molecular docking studies identified IL-6, TNF-α, MMP9, PTGS2, and HIF1A as key targets, with potentially involved in the NF- κ B and IL-17 signaling pathways. These findings highlight G. mollis as a promising candidate for the treatment of inflammation-related diseases.

关键词： Gomphandra mollis Stemonuraceae anti-inflammatory activity molecular docking network pharmacology

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Performance of the prototype shaftless small scale horizontal wind turbine for electricity generating from industrial exhaust air system

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IOP Conference Series: Earth and Environmental science 2020年第1期463卷

作者： Wachira Puttichaem Yuttanant Boonyongmaneerat Pakpachong Vadhanasindhu Sompong Putivisutisak Technopreneurship and Innovation Management Program Graduate School Chulalongkorn University Bangkok 10330 Thailand Metallurgy and Materials Science Research Institute (MMRI) Chulalongkorn University Bangkok 10330 Thailand Faculty of Commerce and Accountancy Chulalongkorn Business School Chulalongkorn University Bangkok 10330 Thailand Advanced Computational Fluid Dynamics Research Unit Department of Mechanical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

Man-made or unnatural wind from the industrial exhaust air system is an alternative wind resource for countries with natural low-speed or intermittent wind such as Thailand. It has strong and consistent wind speed when compared to the natural wind, with velocity about 5 to 10 m/s at a distance of 5 cm from the exhaust air outlet. However, some negative impacts to the exhaust air system performance was observed when a conventional wind turbine was employed. The objective of this research is to feasibility study the practicality of a prototype shaftless small scale horizontal axis wind turbine (SSHWT) to generate electricity from the exhaust air of the industrial exhaust air system. Aerodynamic, blade and generator designs were addressed in this study to maximize energy output and minimize negative impacts to the performance of the original exhaust air system. The performance of SSHWT was tested with a selected industrial fan that is widely used in industrial sections. The results showed that the SSHWT could generate electricity with less negative effect to exhaust air system performance. However, it still needs further improvements caused by the voltage output is too low. By the concept design, this innovative wind turbine is compact, thus needs only small space for installation. This SSHWT has high market potential for low wind speed countries to take advantage of unnatural wind resources which are better in terms of efficiency and economy for sustainable energy development.

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Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

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Nature Astronomy 2023年 633页

作者： Marine Paquet Frederic Moynier Wei Dai Yan Hu Martin Bizzarro Marc Chaussidon Tetsuya Yokoyama Ikshu Gautam Makiko K. Haba Akira Ishikawa Yuki Masuda Yoshinari Abe Jérôme Aléon Conel M. O’D. Alexander Richard W. Carlson Larry Nittler Sachiko Amari Yuri Amelin Ken-ichi Bajo Noriyuki Kawasaki Sohei Wada Hisayoshi Yurimoto Audrey Bouvier Byeon-Gak Choi Nicolas Dauphas Andrew M. Davis Tommaso Di Rocco Andreas Pack Wataru Fujiya Ryota Fukai Tomohiro Usui Kanako Sakamoto Masanao Abe Akiko Miyazaki Aiko Nakato Masahiro Nishimura Tatsuaki Okada Toru Yada Kasumi Yogata Satoru Nakazawa Takanao Saiki Satoshi Tanaka Yuichi Tsuda Makoto Yoshikawa Yuki Hibiya Hiroshi Hidaka Sei-ichiro Watanabe Hisashi Homma Peter Hoppe Gary R. Huss Alexander N. Krot Kazuhide Nagashima Kiyohiro Ichida Shintaro Komatani Mayu Morita Morihiko Onose Tsuyoshi Iizuka Trevor R. Ireland Motoo Ito Takaaki Noguchi Shoichi Itoh Noriko T. Kita Kouki Kitajima Thorsten Kleine Ming-Chang Liu Kevin D. McKeegan Lauren Tafla Haolan Tang Edward D. Young Kazuko Motomura Izumi Nakai David Nesvorný Ann N. Nguyen Changkun Park Laurette Piani Liping Qin Sara S. Russell Naoya Sakamoto Maria Schönbächler Kentaro Terada Yasuko Terada Meenakshi Wadhwa Richard J. Walker Katsuyuki Yamashita Qing-Zhu Yin Shigekazu Yoneda Hiroharu Yui Ai-Cheng Zhang Tomoki Nakamura Hiroshi Naraoka Ryuji Okazaki Hikaru Yabuta Fuyuto Terui Shogo Tachibana Université Paris Cité Institut de Physique du Globe de Paris CNRS Paris France Centre for Star and Planet Formation GLOBE Institute University of Copenhagen Copenhagen Denmark Department of Earth and Planetary Sciences Tokyo Institute of Technology Tokyo Japan Graduate School of Engineering Materials Science and Engineering Tokyo Denki University Tokyo Japan Institut de Minéralogie de Physique des Matériaux et de Cosmochimie Sorbonne Université Muséum National d’Histoire Naturelle CNRS UMR 7590 IRD Paris France Earth and Planets Laboratory Carnegie Institution for Science Washington DC USA McDonnell Center for the Space Sciences and Physics Department Washington University St. Louis MO USA Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Natural History Sciences IIL Hokkaido University Sapporo Japan Bayerisches Geoinstitut Universität Bayreuth Bayreuth Germany Department of Earth Science Education Seoul National University Seoul Republic of Korea Department of the Geophysical Sciences and Enrico Fermi Institute The University of Chicago Chicago IL USA Faculty of Geosciences and Geography University of Göttingen Göttingen Germany Faculty of Science Ibaraki University Mito Japan ISAS/JSEC JAXA Sagamihara Japan General Systems Studies The University of Tokyo Tokyo Japan Earth and Planetary Sciences Nagoya University Nagoya Japan Osaka Application Laboratory SBUWDX Rigaku Corporation Osaka Japan Max Planck Institute for Chemistry Mainz Germany Hawai’i Institute of Geophysics and Planetology University of Hawai’i at Mānoa Honolulu HI USA Analytical Technology Horiba Techno Service Co. Ltd Kyoto Japan Earth and Planetary Science The University of Tokyo Tokyo Japan School of Earth and Environmental Sciences The University of Queensland St Lucia Queensland Australia Kochi Institute for Core Sample Research JAMSTEC Kochi Japan Earth and Planetary Sciences Kyoto University Kyoto Japan Geoscience Universit

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Bioinspired Adhesives: A Phenol‐Amine Superglue Inspired by Insect Sclerotization Process (Adv. Mater. 43/2020)

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Advanced materials 2020年第43期32卷

作者： Younseon Wang Eun Je Jeon Jeehee Lee Honggu Hwang Seung‐Woo Cho Haeshin Lee Department of Chemistry Korea Advanced Institute of Science and Technology (KAIST) 291 University Rd. Daejeon 34141 Republic of Korea Department of Biotechnology Yonsei University 50 Yonsei‐ro Seoul 03722 Republic of Korea Department of Biomaterials Science and Engineering Yonsei University 50 Yonsei‐ro Seoul 03722 Republic of Korea Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 University Rd. Daejeon 34141 Republic of Korea KONON Advanced Research Cluster KOLON One&Only Tower 110 Magokdong‐ro Seoul 07793 Republic of Korea Center for Nanomedicine Institute for Basic Science (IBS) 50 Yonsei‐ro Seoul 03722 Republic of Korea Graduate Program of Nano Biomedical Engineering (NanoBME) Advanced Science Institute Yonsei University 50 Yonsei‐ro Seoul 03722 Republic of Korea

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Probing the Band Structure of Topological Silicon Photonic Lattices in the Visible Spectrum

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Physical Review Letters 2019年第11期122卷 117401-117401页

作者： Siying Peng (彭斯颖) Nick J. Schilder Xiang Ni Jorik van de Groep Mark L. Brongersma Andrea Alù Alexander B. Khanikaev Harry A. Atwater Albert Polman Applied Physics California Institute of Technology Pasadena California 91125 USA Center for Nanophotonics AMOLF Science Park 104 1098 XG Amsterdam Netherlands Department of Electrical Engineering City College of City University of New York New York 10031 USA Physics Program The Graduate Center City University of New York 365 Fifth Avenue New York New York 10016 USA Geballe Laboratory for Advanced Materials Stanford University 476 Lomita Mall Stanford California 94305 USA Photonics Initiative Advanced Science Research Center City University of New York 85 St. Nicholas Terrace New York New York 10031 USA

We study two-dimensional hexagonal photonic lattices of silicon Mie resonators with a topological optical band structure in the visible spectral range. We use 30 keV electrons focused to nanoscale spots to map the local optical density of states in topological photonic lattices with deeply subwavelength resolution. By slightly shrinking or expanding the unit cell, we form hexagonal superstructures and observe the opening of a band gap and a splitting of the double-degenerate Dirac cones, which correspond to topologically trivial and nontrivial phases. Optical transmission spectroscopy shows evidence of topological edge states at the domain walls between topological and trivial lattices.

关键词： Nanophotonics Photonic crystals Topological effects in photonic systems

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