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EMPRESS. X. Spatially resolved mass-metallicity relation in extremely metal-poor galaxies: Evidence of episodic star-formation fueled by a metal-poor gas infall

arXiv

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arXiv 2024年

作者： Nakajima, Kimihiko Ouchi, Masami Isobe, Yuki Xu, Yi Ozaki, Shinobu Nagao, Tohru Inoue, Akio K. Rauch, Michael Kusakabe, Haruka Onodera, Masato Nishigaki, Moka Ono, Yoshiaki Sugahara, Yuma Hattori, Takashi Hirai, Yutaka Hashimoto, Takuya Kim, Ji Hoon Moriya, Takashi J. Yanagisawa, Hiroto Aoyama, Shohei Fujimoto, Seiji Fukushima, Hajime Fukushima, Keita Harikane, Yuichi Hatano, Shun Hayashi, Kohei Ishigaki, Tsuyoshi Kawasaki, Masahiro Kojima, Takashi Komiyama, Yutaka Koyama, Shuhei Koyama, Yusei Lee, Chien-Hsiu Matsumoto, Akinori Mawatari, Ken Motohara, Kentaro Murai, Kai Nagamine, Kentaro Nakane, Minami Saito, Tomoki Sasaki, Rin Shibuya, Takatoshi Suzuki, Akihiro Takeuchi, Tsutomu T. Umeda, Hiroya Umemura, Masayuki Watanabe, Kuria Yabe, Kiyoto Yajima, Hidenobu Zhang, Yechi National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Chiba Kashiwa277-8582 Japan Osawa 2-21-1 Mitaka Tokyo181-8588 Japan University of Tokyo Chiba Kashiwa277-8583 Japan Kavli Institute for Cosmology University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Cavendish Laboratory University of Cambridge 19 JJ Thomson Avenue CambridgeCB3 0HE United Kingdom Waseda Research Institute for Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Department of Physics Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Research Center for Space and Cosmic Evolution Ehime University Bunkyo-cho 2-5 Ehime Matsuyama790-8577 Japan Department of Physics School of Advanced Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Observatories of the Carnegie Institution for Science 813 Santa Barbara St. PasadenaCA91101 United States Observatoire de Genève Université de Genève 51 Chemin de Pégase Versoix1290 Switzerland 650 North Aohoku Place HiloHI96720 United States Department of Physics and Astronomy University of Notre Dame 225 Nieuwland Science Hall Notre DameIN46556 United States Astronomical Institute Tohoku University 6-3 Aoba Aramaki Aoba-ku Miyagi Sendai980-8578 Japan Division of Physics Faculty of Pure and Applied Sciences University of Tsukuba Ibaraki Tsukuba305-8571 Japan Faculty of Pure and Applied Sciences University of Tsukuba Ibaraki Tsukuba305-8571 Japan Astronomy Program Department of Physics and Astronomy Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of SNU Astronomy Research Cent

Using the Subaru/FOCAS IFU capability, we examine the spatially resolved relationships between gas-phase metallicity, stellar mass, and star-formation rate surface densities (Σ★ and ΣSFR, respectively) in extremely metal-poor galaxies (EMPGs) in the local universe. Our analysis includes 24 EMPGs, comprising 9,177 spaxels, which span a unique parameter space of local metallicity (12 + log(O/H) 6.9 to 7.9) and stellar mass surface density (Σ★ ∼ 105 to 107 Mo kpc−2), extending beyond the range of existing large integral-field spectroscopic surveys. Through spatially resolved emission line diagnostics based on the [N ii] BPT-diagram, we verify the absence of evolved active galactic nuclei in these EMPGs. Our findings reveal that, while the resolved mass-metallicity relation exhibits significant scatter in the low-mass regime, this scatter is closely correlated with local star-formation surface density. Specifically, metallicity decreases as ΣSFR increases for a given Σ★. Notably, half of the EMPGs show a distinct metal-poor horizontal branch on the resolved mass-metallicity relation. This feature typically appears at the peak clump with the highest Σ★ and ΣSFR and is surrounded by a relatively metal-enriched ambient region. These findings support a scenario in which metal-poor gas infall fuels episodic star formation in EMPGs, consistent with the kinematic properties observed in these systems. In addition, we identify four EMPGs with exceptionally low central metallicities (12 + log(O/H) 7.2), which display only a metal-poor clump without a surrounding metal-rich region. This suggests that such ultra-low metallicity EMPGs, at less than a few percent of the solar metallicity, may serve as valuable analogs for galaxies in the early stages of galaxy evolution. Copyright © 2024, The Authors. All rights reserved.

关键词： Spectroscopic analysis

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Validating first-principles molecular dynamics calculations of oxide/water interfaces with x-ray reflectivity data

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Physical Review materials 2020年第11期4卷 113805-113805页

作者： Katherine J. Harmon Kendra Letchworth-Weaver Alex P. Gaiduk Federico Giberti Francois Gygi Maria K. Y. Chan Paul Fenter Giulia Galli Applied Physics Graduate Program Northwestern University Evanston Illinois 60208 USA Center for Nanoscale Materials Argonne National Laboratory Lemont Illinois 60439 USA Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 USA Department of Physics and Astronomy James Madison University Harrisonburg Virginia 22807 USA Department of Computer Science University of California Davis California 95616 USA Chemical Sciences and Engineering Division Argonne National Laboratory Lemont Illinois 60439 USA Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Chemistry University of Chicago Chicago Illinois 60637 USA

Metal oxide/water interfaces play a crucial role in many electrochemical and photocatalytic processes, such as photoelectrochemical water splitting, the creation of fuel from sunlight, and electrochemical CO2 reduction. First-principles electronic structure calculations can reveal unique insights into these processes, such as the role of the alignment of the oxide electronic energy levels with those of liquid water. An essential prerequisite for the success of such calculations is the ability to predict accurate structural models of these interfaces, which in turn requires careful experimental validation. Here we report a general, quantitative validation protocol for first-principles molecular dynamics simulations of oxide/aqueous interfaces. The approach makes direct comparisons of interfacial x-ray reflectivity (XR) signals from experimental measurements and those obtained from ab initio simulations with semilocal and van der Waals functionals. The protocol is demonstrated here for the case of the Al2O3(001)/water interface, one of the simplest oxide/water interfaces. We discuss the technical requirements needed for validation, including the choice of the density functional, the simulation cell size, and the optimal choice of the thermodynamic ensemble. Our results establish a general paradigm for the validation of structural models and interactions at solid/water interfaces derived from first-principles simulations. While there is qualitative agreement between the simulated structures and the experimental best-fit structure, direct comparisons of simulated and measured XR intensities show quantitative discrepancies that derive from both bulk regions (i.e., alumina and water) as well as the interfacial region, highlighting the need for accurate density functionals to properly describe interfacial interactions. Our results show that XR data are sensitive not only to the atomic structure (i.e., the atom locations) but also to the electron-density distributions in bo

关键词： First-principles calculations Surface & interfacial phenomena Liquid-solid interfaces Electronic structure X-ray reflectivity

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Acoustic Ghost Imaging in the Time Domain

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Physical Review Applied 2020年第6期13卷 064044-064044页

作者： Yuan Tian Hao Ge Xiu-Juan Zhang Xiang-Yuan Xu Ming-Hui Lu Yun Jing Yan-Feng Chen National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 Jiangsu China The Institute of Acoustics of the Chinese Academy of Sciences 100190 Beijing China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 Jiangsu China Department of Mechanical and Aerospace Engineering North Caroline State University Raleigh North Carolina 27695 USA Graduate Program in Acoustics The Pennsylvania State University University Park Pennsylvania 16802 USA

Ghost imaging (GI) enables reconstruction of the image of an object by measuring the intensity correlation of two beams, neither of which independently carries the spatial characteristics of the object. By exploiting the space-time duality, GI has been extended from the spatial domain to the time domain, and has been successfully demonstrated in the optical regime. This article reports on the experimental demonstration of acoustic GI in the time domain. Using ultrasound instead of photons, we created high-quality ghost images of a temporal object, even in the presence of strong ambient noise. Our work offers a fresh approach for imaging disturbance-sensitive acoustic signals, and could open the gateway to identifying new approaches in acoustic sensing, dynamic imaging, and communications.

关键词： Acoustic measurements Acoustic signal processing & noise Ghost imaging Ultrasonics Ultrasound techniques

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Self-packaged stretchable printed circuits with ligand-bound liquid metal particles in elastomer

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Nature communications 2025年第1期16卷 4944页

作者： Hyeonyeob Seo Gun-Hee Lee Jiwoo Park Dong-Yeong Kim Yeonzu Son Semin Kim Kum Seok Nam Congqi Yang Joonhee Won Jae-Young Bae Hyunjun Kim Seung-Kyun Kang Steve Park Jiheong Kang Seongjun Park Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea. Departments of Cogno-Mechatronics Engineering Pusan National University Busan Republic of Korea. Departments of Optics and Mechatronics Engineering Pusan National University Busan Republic of Korea. School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea. Program of Brain and Cognitive Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea. Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea. Medical Research Center Seoul National University Seoul Republic of Korea. Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea. Department of Materials Science and Engineering Seoul National University Seoul Republic of Korea. KAIST Institute for NanoCentury Daejeon Republic of Korea. Department of Chemistry Seoul National University Seoul Republic of Korea. jiheongkang@snu.ac.kr. Medical Research Center Seoul National University Seoul Republic of Korea. seongjunpark@snu.ac.kr. Department of Biomedical Sciences College of Medicine Seoul National University Seoul Republic of Korea. seongjunpark@snu.ac.kr. School of Transdisciplinary Innovations Seoul National University Seoul Republic of Korea. seongjunpark@snu.ac.kr. Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul Republic of Korea. seongjunpark@snu.ac.kr. Department of Transdisciplinary Medicine Seoul National University Hospital Seoul South Korea. seongjunpark@snu.ac.kr.

Packaging in stretchable electronics is crucial to protect components from environmental damage while preserving mechanical flexibility and providing electrical insulation. The conventional packaging process involves multiple steps that increase in complexity as the number of circuit layers multiply. In this study, we introduce a self-packaged stretchable printed circuit board enabled by the in situ phase separation of liquid metal particles (LMPs) within various polymer matrices during solution-based printing processes. The ligand-bound LMPs (LB-LMPs), engineered to inhibit oxide growth, undergo in situ sintering, prompting vertical phase separation. This synthesis strategy not only achieves high initial conductivity of the LMPs but also encapsulates them within the polymer matrix, preventing leakage and providing electrical insulation. Our method enables multi-layer circuit printing, eliminating the need for additional activation and packaging processes. Furthermore, by integrating conductive materials into packaging layers for selective electrical conductivity, vertical interconnect accesses and conductive pads can be formed, enabling large-scale, stretchable, and leakage-free multi-layer electrical circuits and bio-interfaces.

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Microscopic mechanism of van der Waals heteroepitaxy in the formation of MoS2/hBN vertical heterostructures

arXiv

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arXiv 2020年

作者： Okada, Mitsuhiro Maruyama, Mina Okada, Susumu Warner, Jamie H. Kureishi, Yusuke Uchiyama, Yosuke Taniguchi, Takashi Watanabe, Kenji Shimizu, Tetsuo Kubo, Toshitaka Shinohara, Hisanori Kitaura, Ryo Tsukuba Ibaraki305-8565 Japan Graduate School of Pure and Applied Sciences University of Tsukuba Tsukuba Ibaraki305-8571 Japan Walker Department of Mechanical Engineering University of Texas at Austin 204 East Dean Keeton Street AustinTX78712 United States Materials Graduate Program Texas Materials Institute University of Texas at Austin 204 East Dean Keeton Street AustinTX78712 United States Department of Chemistry Nagoya University Nagoya Aichi464-8602 Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba Ibaraki305-0044 Japan Research Center for Functional Materials National Institute for Materials Science Tsukuba Ibaraki305-0044 Japan

Recent works have revealed that van der Waals (vdW) heteroepitaxial growth of 2D materials on crystalline substrates, such as hexagonal boron nitride (hBN), leads to formation of self-aligned grains, which results in defect-free stitching between the grains. However, how the weak vdW interaction causes strong limitation on crystal orientation of grains is still not understood yet. In this work, we have focused on investigation of microscopic mechanism of self-alignment of MoS2 grains in vdW epitaxial growth on hBN. Through calculation based on density functional theory and the Lennard-Jones potential, we found that interlayer energy between MoS2 and hBN strongly depends both on size and crystal orientation of MoS2. We also found that, when size of MoS2 is ca. 40 nm, rotational energy barrier can exceed ~ 1 eV, which should suppress rotation to align crystal orientation of MoS2 even at growth temperature. Copyright © 2020, The Authors. All rights reserved.

关键词： Van der Waals forces

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Cementing the grain boundary defects in the strain relaxed mixed Sn-Pb perovskite solar cells

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Chemical engineering Journal 2025年 516卷

作者： Kumar, Abhishek Ansari, Zeeshan Alam Hanmandlu, Chintam Banerjee, Soumallya Chen, Yu-Te Yang, Po-Yu Musa, Ahmed Fouad You, Yun-Wen Pao, Chun-Wei Wei, Tzu-Chien Shyue, Jing-Jong Lu, Yu-Jung Chu, Chih-Wei Department of Physics National Taiwan University Sec. 4 Roosevelt Road Taipei106 Taiwan Research Center for Applied Sciences Academia Sinica 128 Academia Road Section 2 Taipei Nangang11529 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei106 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Chemical Engineering National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu City300044 Taiwan College of Engineering Center for Green Technology Chang Gung University Taoyuan City333002 Taiwan Department of Photonics National Yang Ming Chiao Tung University Hsinchu City30010 Taiwan Institute of Applied Mechanics National Taiwan University Sec. 4 Roosevelt Road Taipei106 Taiwan

Mixed Tin-lead (Sn-Pb) perovskite solar cells (PSCs) offer a promising avenue for achieving high power conversion efficiencies (PCEs) due to their narrow bandgaps and substantial optical absorption in the visible–near-infrared region. However, the disparated reaction kinetics of PbI2 and SnI2 with organic salts, resulting in an uneven spatial distribution of Sn2+ and Pb2+ within the perovskite lattice, inducing micro-strain in the film and a Sn-rich surface vulnerable to oxidation-Sn2+ to Sn4+, thereby elevating nonradiative recombination. Here, we report the incorporation of 2,5-Dibromo-3,4-pyridinediamine (DBPDA) as an additive in the mixed Sn-Pb perovskite precursor solution, designed to mitigate micro-strain formation, reduce defect density by suppressing Sn4+ formation, and enhance the passivation of undercoordinated Sn/Pb species through synergistic bonding interaction. The best performing PSCs achieved an impressive PCE of 21.24 % with a high open circuit voltage (Voc) of 0.85 V, alongside significantly improved long-term stability, retaining near 80 % of their initial PCE after 1,008 h in a nitrogen-filled glovebox without encapsulation. In contrast, the control devices retained only 18 % of their initial efficiency under identical conditions. Additionally, an enhanced field effect hole mobility, increasing from 0.18 cm2/V-s in the control film to 1.43 cm2/V-s in the target film, was achieved in mixed Sn-Pb perovskite thin film transistors (TFTs) using these films as active layers. These findings present a viable strategy for strain-relieved perovskite films, enabling stable and high-performance mixed Sn-Pb PSCs and TFTs. © 2025 Elsevier B.V.

关键词： Crystallization kinetics

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Photoluminescence of oxygen vacancy-rich nano-TiO2 photocatalyst for methylene blue color degradation

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materials science and engineering: B 2025年 320卷

作者： Simanjuntak, Mayer Made Joni, I. Faizal, Ferry Gultom, Noto Susanto Kuo, Dong-Hau Panatarani, Camellia Department of Physics Faculty of Mathematic and Natural Sciences Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor Sumedang45363 Indonesia Study Program of Biotechnology Faculty of Graduate School Universitas Padjadjaran Jl. Dipati Ukur No.35 Coblong Bandung40132 Indonesia Functional Nano Powder University Center of Excellence Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor Sumedang45363 Indonesia Department of Materials Science and Engineering National Taiwan University of Science and Technology No.43 Sec. 4 Keelung Road Taipei10607 Taiwan

Wastewater containing synthetic dyes poses a critical environmental hazard, necessitating the development of effective treatment techniques. Despite its promise as a photocatalyst, TiO2′s inability to efficiently absorb visible light limits its practical use. To overcome this limitation, oxygen vacancy (OV) engineering was carried out in TiO2 through solvothermal at temperatures of 150°C, 180°C, and 210°C. Comprehensive analyses confirmed a temperature-induced increase in crystallinity and OV concentration. Furthermore, photoluminescence analysis revealed mid-gap states that improve visible light absorption. Notably, the T150 sample achieved 93.43% degradation of methylene blue within 3 h under sunlight, outperforming commercial TiO2. The superior performance was attributed to a reduced bandgap energy, enhanced charge carrier separation, and increased generation of reactive oxygen species, all facilitated by an optimal concentration of OV. This study clarifies the interaction between photoluminescence and photocatalytic activity, highlighting OV engineering as a highly effective strategy for developing advanced TiO2-based materials for wastewater treatment. © 2025 Elsevier B.V.

关键词： Photocatalytic activity

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Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor

arXiv

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arXiv 2022年

作者： Klein, Julian Song, Zhigang Pingault, Benjamin Dirnberger, Florian Chi, Hang Curtis, Jonathan B. Dana, Rami Bushati, Rezlind Quan, Jiamin Dekanovsky, Lukas Sofer, Zdenek Alù, Andrea Menon, Vinod M. Moodera, Jagadeesh S. Lončar, Marko Narang, Prineha Ross, Frances M. Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA United States College of Letters and Sciences UCLA Los AngelesCA90095 United States QuTech Delft University of Technology Delft2600 GA Netherlands Department of Physics City College of New York New YorkNY10031 United States Francis Bitter Magnet Laboratory Plasma Science and Fusion Center Massachusetts Institute of Technology CambridgeMA02139 United States U.S. Army CCDC Army Research Laboratory AdelphiMD20783 United States Department of Physics The Graduate Center City University of New York New YorkNY10016 United States Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Photonics Initiative CUNY Advanced Science Research Center New YorkNY10031 United States Department of Electrical Engineering City College of the City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10026 United States Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 Prague 6166 28 Czech Republic Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States

Atomic-level defects in van der Waals (vdW) materials are essential building blocks for quantum technologies and quantum sensing applications. The layered magnetic semiconductor CrSBr is an outstanding candidate for exploring optically active defects owing to a direct gap in addition to a rich magnetic phase diagram including a recently hypothesized defect-induced magnetic order at low temperature. Here, we show optically active defects in CrSBr that are probes of the local magnetic environment. We observe spectrally narrow (1 meV) defect emission in CrSBr that is correlated with both the bulk magnetic order and an additional low temperature defect-induced magnetic order. We elucidate the origin of this magnetic order in the context of local and non-local exchange coupling effects. Our work establishes vdW magnets like CrSBr as an exceptional platform to optically study defects that are correlated with the magnetic lattice. We anticipate that controlled defect creation allows for tailor-made complex magnetic textures and phases with the unique ingredient of direct optical access. Copyright © 2022, The Authors. All rights reserved.

关键词： Magnetic semiconductors

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Nanoscale probing of image-potential states and electron transfer doping in borophene polymorphs

arXiv

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arXiv 2020年

作者： Liu, Xiaolong Wang, Luqing Yakobson, Boris I. Hersam, Mark C. Applied Physics Graduate Program Northwestern University EvanstonIL60208 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Department of Chemistry Rice University HoustonTX77005 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States

Using field-emission resonance spectroscopy with an ultrahigh vacuum scanning tunneling microscope, we reveal Stark-shifted image-potential states of the v1/6 and v1/5 borophene polymorphs on Ag(111) with long lifetimes, suggesting high borophene lattice and interface quality. These image-potential states allow the local work function and interfacial charge transfer of borophene to be probed at the nanoscale and test the widely employed self-doping model of borophene. Supported by apparent barrier height measurements and density functional theory calculations, electron transfer doping occurs for both borophene phases from the Ag(111) substrate. In contradiction with the self-doping model, a higher electron transfer doping level occurs for denser v1/6 borophene compared to v1/5 borophene, thus revealing the importance of substrate effects on borophene electron transfer. Copyright © 2020, The Authors. All rights reserved.

关键词： Electron transitions

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Front Cover: Pyromellitic-Diimide-Based Liquid Material Forming an Exciplex with Naphthalene (ChemPhotoChem 6/2023)

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ChemPhotoChem 2023年第6期7卷

作者： Yuya Tanabe Hiroki Tsutsui Dr. Shinya Matsuda Dr. So Shikita Prof. Takuma Yasuda Dr. Kyosuke Isoda Program in Advanced Materials Science Faculty of Engineering and Design Kagawa University 2217-20 Hayashi-cho Takamatsu Kagawa 761-0396 Japan Department of Applied Chemistry Graduate School of Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Institute for Advanced Study Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Health Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 2217-14 Hayashi-cho Takamatsu Kagawa 761-0395 Japan Organic Materials Chemistry Group Sagami Chemical Research Institute 2743-1 Hayakawa Ayase Kanagawa 252-1193 Japan

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