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arXiv 2024年

作者： Zhang, Hanlei Bai, Jincheng Chen, Xiabo Li, Can Zhong, Chuanjian Fang, Jiye Zhou, Guangwen Advanced Materials Characterization Laboratory Materials Research Center Missouri University of Science and Technology RollaMO65409 United States Materials Science and Engineering Program Department of Mechanical Engineering State University of New York BinghamtonNY13902 United States Department of Chemistry State University of New York BinghamtonNY13902 United States

Scanning transmission electron microscopy (STEM) is a powerful tool to reveal the morphologies and structures of materials, thereby attracting intensive interests from the scientific and industrial communities. The outstanding spatial (atomic level) and temporal (ms level) resolutions of the STEM techniques generate fruitful amounts of high-definition data, thereby enabling the high-volume and high-speed analysis of materials. On the other hand, processing of the big dataset generated by STEM is time-consuming and beyond the capability of human-based manual work, which urgently calls for computer-based automation. In this work, we present a deep-learning mask region-based neural network (Mask R-CNN) for the recognition of nanoparticles imaged by STEM, as well as generating the associated dimensional analysis. The Mask R-CNN model was tested on simulated STEM-HAADF results with different Gaussian noises, particle shapes and particle sizes, and the results indicated that Gaussian noise has determining influence on the accuracy of recognition. By applying Gaussian and Non-Local Means filters on the noise-containing STEM-HAADF results, the influences of noises are largely mitigated, and recognition accuracy is significantly improved. This filtering-recognition approach was further applied to experimental STEM-HAADF results, which yields satisfying accuracy compared with the traditional threshold methods. The deep-learning-based method developed in this work has great potentials in analysis of the complicated structures and large data generated by STEM-HAADF. © 2024, CC BY.

关键词： Gaussian noise (electronic)

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Demonstration of a Bosonic Quantum Classifier with Data Reuploading

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Physical Review Letters 2023年第1期131卷 013601-013601页

作者： Takafumi Ono Wojciech Roga Kentaro Wakui Mikio Fujiwara Shigehito Miki Hirotaka Terai Masahiro Takeoka Program in Advanced Materials Science Faculty of Engineering and Design Kagawa University 2217-20 Hayashi-cho Takamatsu Kagawa 761-0396 Japan JST PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Department of Electronics and Electrical Engineering Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology (NICT) Koganei Tokyo 184-8795 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi Kobe 651-2492 Japan

In a single qubit system, a universal quantum classifier can be realized using the data reuploading technique. In this study, we propose a new quantum classifier applying this technique to bosonic systems and successfully demonstrate it using a silicon-based photonic integrated circuit. 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 success probability of 94±0.8% in the proof of principle experiment. As this method can be applied to an arbitrary two-mode N-photon system, further development of optical quantum classifiers, such as extensions to quantum entangled and multiphoton states, is expected in the future.

关键词： Machine learning Optical quantum information processing Quantum algorithms

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Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

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Light(advanced Manufacturing) 2024年第3期5卷 62-74页

作者： Hsin-Hui Huang Takeshi Nagashima Kota Kumagai Yoshio Hayasaki Saulius Juodkazis Vladimir T.Tikhonchuk Koji Hatanaka Optical Sciences Centre ARC Training Centre in Surface Engineering for Advanced Materials(SEAM)School of ScienceSwinburne University of TechnologyHawthornVictoria 3122Australia Faculty of Science and Engineering Setsunan University17-8 Ikeda-NakamachiNeyagawaOsaka572-8508Japan Center for Optical Research and Education(CORE) Utsunomiya University7-1-2 YotoUtsunomiya 321-8585Japan WRH Program International Research Frontiers Initiative(IRFI)Tokyo Institute of Technology Nagatsuta-choMidori-kuYokohamaKanagawa 226-8503 Japan Laser Research Center Physics FacultyVilnius UniversitySauletekio Ave.1010223 VilniusLithuania Centre Lasers Intenses et Applications Universite de Bordeaux351Cours de la Liberation33405 Talence cedexFrance Extreme Light Infrastructure ERIC ELI Beamlines FacilityZa Radnicic 83525241 Dolni BřežanyCzech Republic Organization for Research Strategy and Development Okayama Univ.1-1-1 Tsushima-nakaKita-kuOkayama 700-8530Japan

Emission of THz radiation from air breakdown at focused ultra-short fs-laser pulses(800 nm/35 fs)was investigated for the 3D spatio-temporal control where two pre-pulses are used before the *** laser pulse induced air breakdown forms a~120μm-long focal volume generate shockwaves which deliver a denser air into the focal region of the main pulse for enhanced generation of THz radiation at 0.1-2.5 THz spectral *** intensity of 162 pre-and main-pulses was at the tunnelling ionisation intensities(1-3)×10 W/cm and corresponded to sub-critical(transparent)plasma formation in *** analysis of THz radiation revealed that orientation of the air density gradients generated by pre-pulses and their time-position locations defined the ellipticity of the generated THz electrical *** rotational component of electric current is the origin of THz radiation.

关键词： THz radiation Femtosecond laser induced breakdown Air breakdown spatio-temporal control

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Circularly polarized luminescent self-organized helical superstructures:From materials and stimulus-responsiveness to applications

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Aggregate 2021年第6期2卷 60-81页

作者： Yanrong He Siyang Lin Jinbao Guo Quan Li Key Laboratory of Carbon Fibers and Functional Polymers Ministry of Educationand College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijingChina Institute of Advanced Materials School of Chemistry and Chemical Engineeringand Jiangsu Province Hi-Tech Key Laboratory for Biomedical ResearchSoutheast UniversityNanjingChina Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State UniversityKentOhioUSA

Circularly polarized luminescence(CPL)has gained considerable attention in various systems and has rapidly developed into an emerging research *** meet the needs of actual applications in diverse fields,a high luminescence dissymmetry factor(glum)and tunable optical performance of CPL would be the most urgent pursuit for ***,many emerging CPL materials and various strategies have been developed to address these critical *** cholesteric liquid crystals(CLCs),that is,luminescent self-organized helical superstructures,are considered to be ideal candidates for constructing CPL-active materials,as they not only exhibit high glum values,but also enable flexible optical control of *** review mainly summarizes the characteristics of CPL based on CLCs as the bulk phase doped with different emitters,including aggregated induced emission molecules,conventional organic small molecules,polymer emitters,metal-organic complex emitters,and luminescent *** addition,the recent significant progress in stimulus-responsive CPL based on emissive CLCs in terms of several types of stimuli,including light,electricity,temperature,mechanical force,and multiple stimuli is ***,a short perspective on the opportunities and challenges associated with CPL-active materials based on the CLC field is *** review is anticipated to offer new insights and guidelines for developing CLC-based CPL-active materials for broader applications.

关键词： amplifying dissymmetry factor cholesteric liquid crystal circularly polarized luminescence self-organized helical superstructure stimulus-responsiveness

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Accuracy Enhancement of L-Band EPR Tooth Dosimetry by Implementing Multiple Harmonic Detection

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SSRN 2024年

作者： Oh, Jeonghun Koo, Chang Uk Park, Jong In Choi, Kwon Lee, Junyoung Hirata, Hiroshi Ye, Sung-Joon Program in Biomedical Radiation Sciences Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Ionizing Radiation Metrology Group Korea Research Institute of Standards and Science Daejeon34113 Korea Republic of Research Institute for Convergence Science Seoul National University Seoul08826 Korea Republic of Division of Bioengineering and Bioinformatics Faculty of Information Science and Technology Hokkaido University Sapporo060–0814 Japan Department of Applied Bioengineering Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Advanced Institute of Convergence Technology Seoul National University Suwon16629 Korea Republic of Biomedical Research Institute Seoul National University Hospital Seoul03080 Korea Republic of

In a large-scale radiation accident, the swift classification of individuals exposed to high levels of radiation is crucial to minimize casualties. In-vivo tooth dosimetry using L-band electron paramagnetic resonance (EPR) spectroscopy is a promising method for this purpose, as it can estimate individual exposure levels rapidly and non-invasively. However, the accuracy of dose estimation associated with this technique remains a great challenge. To enhance the accuracy, digital multiple harmonic detection (MHD) was incorporated into a home-built L-band EPR spectrometer. This approach enabled the utilization of information present in higher harmonics of EPR signals, which has been often discarded in traditional EPR spectroscopy. Acquired multiple harmonic spectra were reconstructed to the first derivative spectrum to merge information and mitigate the signal broadening. The modulation amplitude varied in a range of 0.3 to 0.7 mT to maximize the accuracy. In a 0.5-minute measurement at 0.6 mT, the standard error of inverse prediction (SEIP) was reduced to 0.57 Gy from 0.71 Gy. The statistical significancy of the enhancement was validated. In conclusion, the accuracy enhanced by this MHD can contribute to improving the efficiency of triage systems in the aftermath of a mass radiation accident. © 2024, The Authors. All rights reserved.

关键词： Paramagnetic resonance

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Quantum criticality in YbCu4Ni

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Physical Review B 2024年第2期109卷 024435-024435页

作者： Kotaro Osato Takanori Taniguchi Hirotaka Okabe Takafumi Kitazawa Masahiro Kawamata Zhao Hongfei Yoichi Ikeda Yusuke Nambu Dita Puspita Sari Isao Watanabe Jumpei G. Nakamura Akihiro Koda Jun Gouchi Yoshiya Uwatoko Masaki Fujita Institute for Materials Research Tohoku University Katahira Sendai 980-8577 Japan Department of Physics Tohoku University Aoba Sendai 980-8578 Japan Organization for Advanced Studies Tohoku University Sendai 980-8577 Japan FOREST Japan Science and Technology Agency Kawaguchi Saitama 332-0012 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Meson Science Laboratory Nishina Center for Accelerator-Based Science RIKEN Wako Saitama 351-0198 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan The Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan

We report on the quantum criticality of YbCu4Ni as revealed by our combined micro- and macro-measurements. We determine the crystal structure of YbCu4Ni with site mixing by neutron diffraction measurements, which suggests the possible presence of Kondo disorder. However, decreasing the local spin susceptibility distribution and the development of spin fluctuations below 10 K at ambient pressure by muon spin rotation and relaxation measurements suggests that YbCu4Ni exhibits quantum criticality. Therefore, our experimental results indicate that YbCu4Ni is a material that exhibits quantum criticality under zero magnetic field and ambient pressure.

关键词： Critical phenomena Kondo effect Strongly correlated systems Muon spin resonance Neutron diffraction Resistivity measurements

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Quantitative Radiation Dosimetry by Measuring Thermoluminescence of Resistors in Electronic Personal Dosimeters

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SSRN 2024年

作者： Lee, Hyunseok Ye, Sung-Joon Kim, Hong Suk Kim, Ah Reum Yu, Hyungjoon Kim, Myung-Jin Korea Institute of Nuclear Safety Daejeon Korea Republic of Program in Biomedical Radiation Sciences Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul National University Seoul Korea Republic of Research Institute for Convergence Science Seoul National University Seoul Korea Republic of Advanced Institute of Convergence Technology Seoul National University Suwon Korea Republic of RADPION Inc. Daejeon Korea Republic of

A study on retrospective dosimetry was performed using electronic personal dosimeters (EPDs) for reconstructing doses received by radiographic testing workers. The dosimetric properties of the thermoluminescence (TL) peak in the temperature range of 100-200 °C were investigated by measuring the TL of the resistor extracted from the EPDs in a darkroom environment. Results showed that this TL peak exhibited optimal dosimetric properties, with a minimum detectable dose as low as 13 mGy. To calculate the absorbed dose using the resistor, a simplified single aliquot regenerative (SAR) dose method using the TL peak was employed. The zero dose of the commercial EPD (model CLOVER) was determined to be 58 ± 72 mGy through the random selection of six EPDs. Additionally, a dose overestimation correction factor of 1.73 ± 0.09 was calculated. Furthermore, it was observed that the TL signal faded exponentially to approximately 60% over a period of 12 weeks. Subsequently, retrospective dosimetry was performed by irradiating EPDs with a standard gamma ray dose of 1 Gy. The radiation exposure dose calculated from the TL peak of the resistor was found to be approximately 10% lower. These findings showed that the retrospective dosimetry with EPD can be utilized for accurately estimating the radiation exposure dose. © 2024, The Authors. All rights reserved.

关键词： Thermoluminescence

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Anti-PT flatbands

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Physical Review A 2022年第2期105卷 L021305-L021305页

作者： Arindam Mallick Nana Chang Alexei Andreanov Sergej Flach Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34126 Korea Beijing National Research Center for Information Science and Technology Tsinghua University Beijing 100084 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing 100875 People's Republic of China Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Korea

We consider tight-binding single-particle lattice Hamiltonians which are invariant under an antiunitary antisymmetry: the anti-PT symmetry. The Hermitian Hamiltonians are defined on d-dimensional non-Bravais lattices. For an odd number of sublattices, the anti-PT symmetry protects a flatband at energy E=0. We derive the anti-PT constraints on the Hamiltonian and use them to generate examples of generalized kagome networks in two and three lattice dimensions. Furthermore, we show that the anti-PT symmetry persists in the presence of uniform DC fields and ensures the presence of flatbands in the corresponding irreducible Wannier-Stark band structure. We provide examples of the Wannier-Stark band structure of generalized kagome networks in the presence of DC fields, and their implementation using Floquet engineering.

关键词： Electrical conductivity Stark effect Symmetry protected topological states Electronically polarized systems Lattices Discrete symmetries in condensed matter Lattice models in condensed matter Symmetries in condensed matter

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Enhanced Thermoelectric Performance of Bi0.5sb1.5te3/Cu2se Composites Through the Scattering Engineering Strategy

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SSRN 2023年

作者： Nakhowong, Ronariddh Chueachot, Romteera Pinitsoontorn, Supree Seetawan, Tosawat Functional Nanomaterials and Advanced Thermoelectric Materials Research Laboratory Faculty of Science Ubon Ratchathani Rajabhat University Ubon Ratchathani34000 Thailand Program of Chemistry Faculty of Science Ubon Ratchathani Rajabhat University Ubon Ratchathani34000 Thailand Khon Kaen University Khon Kaen40002 Thailand Program of Physics Faculty of Science and Technology Sakon Nakhon Rajabhat University Sakon Nakhon74000 Thailand Program of Physics Faculty of Science Ubon Ratchathani Rajabhat University Ubon Ratchathani34000 Thailand

Bi2Te3-based materials have been widely used in the field of thermoelectric generation at near room temperature. However, material utilization and conversion efficiency, including minority charge carrier excitation at high temperatures, seriously reduces thermoelectric performance with limited applications as thermoelectric power generation. Nanocomposite approaches are practical strategies to boost the thermoelectric figure of merit due to strong phonon scattering from the grain boundaries and nanoinclusions. Here, we report the incorporation of Cu2Se into Bi0.5Sb1.5Te3 (Bi0.5Sb1.5Te3-xCu2Se, where x = 0, 0.1, 0.3, 0.5 and 1.0wt%) synthesized by a solid-state reaction. The thermoelectric performance of Bi0.5Sb1.5Te3 (BST) was synergistically enhanced by the energy-filtering effect and phonon scattering. Cu2Se dispersal into the BST matrix caused enhanced carrier transport properties at the grain boundary interfaces and also a drastic reduction in thermal conductivity. High increase in electrical conductivity was attributed to strong electron scattering at large interface barriers. Low thermal conductivity of 0.63 W m-1 K-1 at 311 K was obtained for BST-0.1wt%Cu2Se. Low thermal conductivity originated from enhanced phonon scattering by Cu2Se as well as phase boundaries between BST and Cu2Se nanophases. These generated a high figure of merit zT of 1.32 at 311 K for 0.1wt%Cu2Se in the BST matrix, significantly higher than pristine BST (zT = 1.19 at 311 K). Results suggested that incorporation of Cu2Se into the BST matrix effectively improved low-temperature thermoelectric power generation of Bi2Te3-based thermoelectric material. © 2023, The Authors. All rights reserved.

关键词： Phonon scattering

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Preparation and properties of bimetallic Co/Cu ZIF-67 for electrochemical application 1

Preparation and properties of bimetallic Co/Cu ZIF-67 for el...

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1st Annual International Conference on Sensor technology, INCOST 2023

作者： Wulandari, C. Gumilar, G. Nugraha Wasisto, H.S. Iqbal, M. Irzaman Nugroho, W.S. Rusydi, F. Doctoral Program of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Advanced Functional Materials Research Group Institut Teknologi Bandung Bandung40132 Indonesia PT Biostark Analitika Inovasi Bandung40375 Indonesia Bandung40135 Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi Bandung Bandung40132 Indonesia PT Nanosense Instrument Indonesia Umbulharjo Yogyakarta55167 Indonesia Department of Physics Faculty of Mathematics and Natural Sciences IPB University Bogor16680 Indonesia Departement of Veterinary Public Health Faculty of Veterinary Medicine Universitas Gadjah Mada Yogyakarta55281 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia

Efforts to enhance the electrochemical properties of materials have become the focus of numerous studies because these properties are essential in various fields of application. Zeolitic imidazole framework-67 (ZIF-67) is a type of metal-organic framework (MOFs) expected to demonstrate excellent performance in electrochemical applications due to its numerous distinct properties. Consequently, various strategies and techniques have been developed to improve the electrochemical performance of ZIF-67. In this study, we employed bimetallic ZIF-67 constructed with cobalt (Co) and copper (Cu) metal ions within the imidazole frameworks. The use of bimetal is expected to increase conductivity and fine-tune the physicochemical properties of ZIF-67. Using coprecipitation methods, we synthesized both single-metal and bimetallic ZIF-67 and compared their characterizations. The addition of Cu metal ions does not alter the materials phase, ensuring compatibility with the single-metal ZIF-67 structure. However, the rhombic dodecahedron morphology of ZIF-67 shifts from a smooth to a concave and rough surface in Co/Cu ZIF-67. Furthermore, Co/Cu ZIF-67 exhibits higher peak current on their cyclic voltammetry (CV) curve by 46.15 μA. The results effectively illustrate the advantages of bimetal on ZIF-67 properties and performance. Finally, this study succesfully briefly demonstrate the potential development of Co/Cu-based ZIF-67 for various electrochemical applications. © Published under licence by IOP Publishing Ltd.

关键词： Metal ions

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