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Quantum critical behavior of the hyperkagome magnet Mn3CoSi

Physical Review Research 2024年第1期6卷 013144-013144页

作者： Hiroki Yamauchi Dita Puspita Sari Yukio Yasui Terutoshi Sakakura Hiroyuki Kimura Akiko Nakao Takashi Ohhara Takashi Honda Katsuaki Kodama Naoki Igawa Kazutaka Ikeda Kazuki Iida Daichi Ueta Tetsuya Yokoo Matthias D. Frontzek Songxue Chi Jaime A. Fernandez-Baca Kenji M. Kojima Donald Arseneau Gerald Morris Bassam Hitti Yipeng Cai Adam Berlie Isao Watanabe Pai-Tse Hsu Yu-Sheng Chen Min Kai Lee Amelia Elisabeth Hall Geetha Balakrishnan Lieh-Jeng Chang Shin-ichi Shamoto Materials Sciences Research Center Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology 307 Fukasaku Minuma-ku Saitama City Saitama 337-8570 Japan Meson Science Laboratory RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan School of Science and Technology Meiji University Kawasaki Kanagawa 214-8571 27 Japan Neutron Industrial Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan Institute of Multidisciprinary Research for Advanced Materials Tohoku University Sendai 980-8577 Japan Neutron Science and Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan J-PARC Center Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Neutron Scattering Division Oak Ridge National Laboratory (ORNL) Oak Ridge Tennessee 37831 USA TRIUMF Vancouver British Columbia V6T 2A3 Canada ISIS Neutron and Muon Source Science and Technology Facilities Council Rutherford Appleton Laboratory Didcot OX11 0QX United Kingdom Department of Physics National Cheng Kung University Tainan 70101 Taiwan National Synchrotron Radiation Research Center Hsinchu 300092 Taiwan Department of Physics University of Warwick Coventry CV4 7AL United Kingdom Institute of Physics Academia Sinica Taipei 115201 Taiwan Advanced Science Research Center Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan

β-Mn-type family alloys Mn3TX (T=Co, Rh, and Ir; X=Si and Ge) have a three-dimensional antiferromagnetic (AF) corner-shared triangular network, i.e., the hyperkagome lattice. The antiferromagnet Mn3RhSi shows magnetic short-range order over a wide temperature range of approximately 500 K above the Néel temperature TN of 190 K. In this family of compounds, as the lattice parameter decreases, the long-range magnetic ordering temperature decreases. Mn3CoSi has the smallest lattice parameter and the lowest TN in the family. The quantum critical point (QCP) from AF to the quantum paramagnetic state is expected near a cubic lattice parameter of 6.15 Å. Although the Néel temperature of Mn3CoSi is only 140 K, the emergence of the quantum critical behavior in Mn3CoSi is discussed. We study how the magnetic short-range order appears in Mn3CoSi by using neutron scattering, μSR, and bulk characterization such as specific heat capacity. According to the results, the neutron scattering intensity of the magnetic short-range order in Mn3CoSi does not change much at low temperatures from that of Mn3RhSi, although the μSR short-range order temperature of Mn3CoSi is largely suppressed to 240 K from that of Mn3RhSi. Correspondingly, the volume fraction of the magnetic short-range order regions, as shown by the initial asymmetry drop ratio of μSR above TN, also becomes small. Instead, the electronic-specific heat coefficient γ of Mn3CoSi is the largest in this Mn3TSi system, possibly due to the low-energy spin fluctuation near the quantum critical point.

关键词： Critical phenomena Exotic phases of matter Magnetic order Magnetism Phase diagrams Phase transitions Quantum phase transitions

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Spectral evidence for unidirectional charge density wave in detwinned BaNi2As2

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Physical Review B 2023年第8期108卷 L081104-L081104页

作者： Yucheng Guo Mason Klemm Ji Seop Oh Yaofeng Xie Bing-Hua Lei Luca Moreschini Cheng Chen Ziqin Yue Sergey Gorovikov Tor Pedersen Matteo Michiardi Sergey Zhdanovich Andrea Damascelli Jonathan Denlinger Makoto Hashimoto Donghui Lu Chris Jozwiak Aaron Bostwick Eli Rotenberg Sung-Kwan Mo Rob G. Moore Junichiro Kono Robert J. Birgeneau David J. Singh Pengcheng Dai Ming Yi Department of Physics and Astronomy Rice University Houston Texas 77005 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley California 94720 USA Department of Physics and Astronomy University of Missouri Columbia Missouri 65211 USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of Oxford Oxford OX1 3PU United Kingdom Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Canadian Light Source Inc. 44 Innovation Boulevard Saskatoon SK S7N 2V3 Canada Department of Physics and Astronomy University of British Columbia Vancouver British Columbia V6T 1Z1 Canada Quantum Matter Institute University of British Columbia Vancouver British Columbia V6T 1Z4 Canada Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40 01187 Dresden Germany Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Materials Science and NanoEngineering Rice University Houston Texas 77005 USA Department of Chemistry University of Missouri Columbia Missouri 65211 USA

In the iron-based superconductors, unconventional superconductivity emerges in proximity to intertwined electronic orders consisting of an electronic nematic order and a spin density wave (SDW). Recently, BaNi2As2, like its well-known iron-based analog BaFe2As2, has been discovered to host a symmetry-breaking structural transition but coupled to a unidirectional charge density wave (CDW) instead of SDW, providing a novel platform to study intertwined orders. Here, through a systematic angle-resolved photoemission spectroscopy study combined with a detwinning B1g uniaxial strain, we identify distinct spectral evidence of band evolution due to the structural transition as well as CDW-induced band folding. In contrast to the nematicity and spin density wave in BaFe2As2, the structural and CDW order parameters in BaNi2As2 are observed to be strongly coupled and do not separate in the presence of uniaxial strain. Furthermore, no nematic band splitting is resolved above the structural transition. Our measurements point to a likely lattice origin of the CDW order in BaNi2As2.

关键词： Charge density waves Nematic phase transition Iron-based superconductors Angle-resolved photoemission spectroscopy

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Zeeman polaritons as a platform for probing Dicke physics in condensed matter

arXiv

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arXiv 2024年

作者： Kritzell, T. Elijah Doumani, Jacques Asano, Tobias Yamada, Sota Tay, Fuyang Xu, Hongjing Yan, Han Katayama, Ikufumi Takeda, Jun Nevidomskyy, Andriy Nojiri, Hiroyuki Bamba, Motoaki Baydin, Andrey Kono, Junichiro Applied Physics Graduate Program Smalley-Curl Institute Rice University 6100 Main Street HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University 6100 Main Street HoustonTX77005 United States Department of Physics Yokohama National University 79-5 Tokiwadai Hodogaya-ku Kanagawa Yokohama240-8501 Japan Department of Physics and Astronomy Rice University 6100 Main Street HoustonTX77005 United States Smalley-Curl Institute Rice University 6100 Main Street HoustonTX77005 United States Institute for Multidisciplinary Sciences Yokohama National University 79-5 Tokiwadai Hodogaya-ku Kanagawa Yokohama240-8501 Japan Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Miyagi Sendai980-8577 Japan Rice Advanced Materials Institute Rice University 6100 Main Street HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University 6100 Main Street HoustonTX77005 United States

The interaction of an ensemble of two-level atoms and a quantized electromagnetic field, described by the Dicke Hamiltonian, is an extensively studied problem in quantum optics. However, experimental efforts to explore similar physics in condensed matter typically employ bosonic matter modes (e.g., phonons, magnons, and plasmons) that are describable as simple harmonic oscillators, i.e., an infinite ladder of equally spaced energy levels. Here, we examine ultrastrong coupling between a coherent light mode and an ensemble of paramagnetic spins, a finite-multilevel system, in Gd3Ga5O12. The electron paramagnetic resonance of Gd3+ ions is tuned by a magnetic field into resonance with a Fabry–Pérot cavity mode, resulting in the formation of spin–photon hybrid states, or Zeeman polaritons. We observe that the light–matter coupling strength, measured through the vacuum Rabi splitting, decreases with increasing temperature, which can be explained by the temperature-dependent population difference between the lower and higher-energy states, a trait of a finite-level system. This finding demonstrates that a spin–boson system is more compatible with the Dicke model and has advantages over boson–boson systems for pursuing experimental realizations of phenomena predicted for ultrastrongly coupled light–matter hybrids. Copyright © 2024, The Authors. All rights reserved.

关键词： Phonons

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Erratum: Single frequency vertical piezoresponse force microscopy [J. Appl. Phys. 5, 051101 (2021)]

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Journal of Applied Physics 2021年第9期129卷

作者： Seungbum Hong 1Materials Imaging and Integration Lab Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea 2KAIST Institute for NanoCentury (KINC) KAIST Daejeon 34141 Republic of Korea

In the published version of the Tutorial,1 the figure caption for Fig. 22 is incorrect. We noticed after publication that the caption of Fig. 22 was the same as

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Demonstration of a bosonic quantum classifier with data re-uploading

arXiv

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arXiv 2022年

作者： Ono, Takafumi Roga, Wojciech Wakui, Kentaro Fujiwara, Mikio Miki, Shigehito Terai, Hirotaka Takeoka, Masahiro Program in Advanced Materials Science Faculty of Engineering and Design Kagawa University 2217-20 Hayashi-cho Kagawa Takamatsu761-0396 Japan JST PRESTO 4-1-8 Honcho Saitama Kawaguchi332-0012 Japan Department of Electronics and Electrical Engineering Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Koganei Tokyo184-8795 Japan Koganei Tokyo184-8795 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi Kobe651-2492 Japan

In a single qubit system, a universal quantum classifier can be realised using the data-reuploading technique. In this study, we propose a new quantum classifier applying this technique to bosonic systems and successfully demonstrated it using silicon optical integrated quantum circuits. We established a theory of quantum machine learning algorithm applicable to bosonic systems and implemented a programmable optical circuit combined with an interferometer. Learning and classification using part of the implemented optical quantum circuit with uncorrelated two-photons resulted in a classification with a reproduction rate of approximately 94% in the proof of principle experiment. As this method can be applied to arbitrary two-mod N-photon system, further development of optical quantum classifiers, such as extensions to quantum entangled and multi-photon states, is expected in the future. Copyright © 2022, The Authors. All rights reserved.

关键词： Cell proliferation

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Electron Transfer Enhanced by a Minimal Energetic Driving Force at the Organic-Semiconductor Interface

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Angewandte Chemie 2024年第37期136卷

作者： Hiroto Iwasaki Keisuke Fujimoto Koki Banno Qing-jun Shui Yutaka Majima Masaki Takahashi Seiichiro Izawa Laboratory for Materials and Structures Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama Kanagawa 226-8503 Japan Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8527 Japan Department of Applied Chemistry Faculty of Engineering Shizuoka University 3-5-1 Johoku Chuo-ku Hamamatsu Shizuoka 432-8561 Japan Precursory Research for Embryonic Science and Technology (PRESTO) Japan Science and Technology Agency (JST) 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan

The energetic driving force for electron transfer must be minimized to realize efficient optoelectronic devices including organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). Exploring the dynamics of a charge-transfer (CT) state at an interface leads to a comprehension of the relationship between energetics, electron-transfer efficiency, and device performance. Here, we investigate the electron transfer from the CT state to the triplet excited state (T 1 ) in upconversion OLEDs with 45 material combinations. By analyzing the CT emission and the singlet excited-state emission from triplet–triplet annihilation via the dark T 1 , their energetics and electron-transfer efficiencies are extracted. We demonstrate that the CT→T 1 electron transfer is enhanced by the stronger CT interaction and a minimal energetic driving force (<0.1 eV), which is explained using the Marcus theory with a small reorganization energy of <0.1 eV. Through our analysis, a novel donor–acceptor combination for the OLED is developed and shows an efficient blue emission with an extremely low turn-on voltage of 1.57 V. This work provides a solution to control interfacial CT states for efficient optoelectronic devices without energy loss.

关键词： electron transfer Marcus theory organic optoelectronic devices organic light-emitting diodes organic photovoltaics

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The biocompatibility and hemostatic efficacy of silk fibroin nanofibrils fabricated by Shear-Induced phase separation process

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Chemical engineering Journal 2023年 474卷

作者： Lu, Po-Wen Wu, Yu-Tzu Chang, Liang-Yu Lu, Tzu-Wei Jaihao, Chonlachat Huang, Ching-Shuan Murphy Chuang, Mo-Fei Lin, Chunche Chen, Innie Brangule, Agnese Zarkov, Aleksej Kareiva, Aivaras Yang, Jen-Chang Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Taipei11052 Taiwan Division of Gastroenterology and Hepatology Department of Internal Medicine Shuang Ho Hospital Taipei Medical University Zhongzheng Rd. Taipei Zhonghe23561 Taiwan Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Department of Dentistry Taipei Medical University Hospital Taipei11031 Taiwan Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei106344 Taiwan Research and Development Center for Smart Textile Technology National Taipei University of Technology Taipei106344 Taiwan Innie Chen Department of Obstetrics and Gynecology University of Ottawa OttawaONK1H 7W9 Canada Department of Pharmaceutical Chemistry Riga Stradins University RīgaLV-1007 Latvia Institute of Chemistry Vilnius University Naugarduko 24 VilniusLT-03225 Lithuania International Ph.D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Research Center of Biomedical Device Taipei Medical University Taipei11031 Taiwan Research Center of Digital Oral Science and Technology Taipei Medical University Taipei11031 Taiwan

The objectives of this study were to investigate the biocompatibility and hemostatic efficacy of silk fibroin nanofibrils (SFNFs). Unlike a conventional dialysis/freeze-drying process, SFNFs were prepared using a novel shear-induced phase-separation method. The morphology, particle size distribution, protein secondary structures, and crystalline structures of the resulting SFNFs were respectively investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), laser diffraction (LD), Fourier-transform infrared (FTIR) spectroscopy, and x-ray diffraction (XRD) deconvolution analyses. Polar and non-polar extractants of SFNFs under a bath ratio of 0.2 g/mL were collected after individually soaking them into 0.9% normal saline and cottonseed oil. In vitro hemolysis ratios, biocompatibility, and sensitization tests were carried out. Then, the hemostatic efficacy was assayed using a rat liver punch biopsy model. Compared to dialyzed/freeze-dried SF, the harvested SFNFs revealed high surface area in morphology. The median particle size distribution, D50, was 294 μm for SFNFs. Shear-induced hydrogen bonding, crystallization, and phase separation tended to give the SFNFs a high crystalline index (CI) and degree of crystallinity (DC). The hemolysis ratio of SFNFs was 0.86 ± 0.40%, and it was classified as being non-hemolytic (0%∼2%). The test results of toxicity and skin sensitization were both negative. The hemostasis time for SFNFs (2.8 ± 0.6 min) was statistically less than that of oxidized cellulose (4.3 ± 0.9 min) (p © 2023 Elsevier B.V.

关键词： Biocompatibility

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Effect of PEG addition and temperature on hard chromium coating using eco-friendly trivalent chromium

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AIP Conference Proceedings 2020年第1期2262卷

作者： Aditianto Ramelan Akmal Fauzi Riska Rachmantyo Firmansyah Sasmita Lidya Ahmad Zein Eko Adhi Setyo Nugroho 1Materials Engineering Study Program Institut Teknologi Bandung Jalan Ganesha 10 Bandung Indonesia

Commonly, electro deposition of chromium is carried out by using Chromium trioxide (CrO3) solution. CrO3 contains hexavalent chromium or Cr(VI) ions which is toxic and carcinogenic. Some countries such as Japan, America and the European Union including Indonesia on have banned the use of it as stated in their safety and health regulation. Chromium hexavalent is then replaced by trivalent chromium as it is safer and environmentally friendly. The trivalent hard chromium plating is more difficult to undertake than hexavalent hard chromium plating. In this research the effect of PEG 4000 addition and solution temperature variation was observed to achieve the maximum surface coating hardness. The result of coating was confirmed by using XRD and Optical Microscope. The highest hardness obtained is 957.2 ± 40 HV0.3 at temperature of 45°C with 6 g/l PEG 4000 addition it has also shown a small micro crack observed by Optical microscope. The maximum thickness of 81.3 ± 4.6 µm observed at 60°C with 6 g/l PEG 4000 addition. The diffractogram obtained is a typical of a trivalent chromium coating. Further research will be carried out to have deeper understanding on the behavior of the trivalent hard chromium electroplating.

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Ipmc Electromechanical Behavior Analysis with Reduced Platinum Layer Aiming Economy and Lower Waste Generation

SSRN

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SSRN 2022年

作者： Dardis, Thiago Petrilli Maffei Saccardo, Matheus C. Tozzi, Kaique A. de Blanco, Guilherme Eduardo O. Zuquello, Ariel G. Barbosa, Rafael Scuracchio, Carlos Henrique Gonçalves, Roger Federal University of Sao Carlos Graduate Program in Materials Science and Engineering Sao Carlos Brazil ESPCI Paris PSL Research University 10 Rue Vauquelin Paris75005 France Baalbek Management 16 Rue Debelleyme Paris75003 France Department of Chemical Sciences University of Padova Via Marzolo 1 Padova35131 Italy Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS Grenoble INP LEPMI UMR5279 Grenoble38000 France Federal University of Sao Carlos Graduate Program in Chemistry Sao Carlos Brazil

Ionomeric Polymer-Metal Composites (IPMCs) are smart materials formed by an electroactive polymer membrane coated on both sides by noble metal electrodes. When an electrical stimulus is applied, an electric field is generated between electrodes, and solvated ions migrate inside the polymeric membrane, causing an internal pressure gradient and bending the device. Despite numerous advantages, it is exceedingly expensive to use noble metals, such as gold and platinum. In addition, the deposition process generates a large amount of toxic waste. Thus, in this paper, a Nafion®-based IPMC with a reduced platinum layer (PR-IPMC) was prepared and electromechanically tested, comparing it with a reference IPMC (R-IPMC). The analyses were performed under precise relative humidity (RH) control. Blocking force and current response were used to evaluate its performance, and the morphology of the Pt layer was evaluated through Scanning Electron Microscopy (SEM). The devices performed better when RH = 90%. The PR-IPMC presented a 60% thinner electrode layer. However, just 40% less blocking force compared to R-IPMC. Besides, the reduced amount of platinum complex used to obtain the device represents a saving of reactants and less waste generation, with satisfactory mechanical performance. © 2022, The Authors. All rights reserved.

关键词： Toxic materials

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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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