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Magnetism in doped infinite-layer NdNiO2 studied by combined density functional theory and dynamical mean-field theory

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Physical Review B 2022年第4期106卷 045105-045105页

作者： Dachuan Chen Peiheng Jiang Liang Si Yi Lu Zhicheng Zhong CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100049 China School of Physics Northwest University Xi'an 710069 China Institute for Solid State Physics Vienna University of Technology 1040 Vienna Austria National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

The recent observation of superconductivity in infinite-layer nickelates has brought intense debate on the established knowledge of unconventional superconductivity based on the cuprates. Despite many similarities, the nickelates differ from the cuprates in many characteristics, the most notable of which is the magnetism. Instead of a canonical antiferromagnetic (AFM) Mott insulator as the undoped cuprates, from which the superconductivity is generally believed to arise upon doping, the undoped nickelates show no sign of magnetic ordering in experiments. Through a combined density functional theory, dynamical mean-field theory, and model study, we show that although the increased energy splitting between O-p orbital and Cu/Ni-d orbital (Δdp) results in a larger magnetic moment in nickelates, it also leads to stronger AFM/ferromagnetism competition and weaker magnetic exchange coupling. Meanwhile, the self-doping effect caused by Nd-d orbital screens the magnetic moment of Ni. The Janus-faced effect of Δdp and self-doping effect together give a systematic understanding of magnetic behavior in nickelates and explain recent experimental observations.

关键词： electronic structure Magnetism Superconductors Density functional theory Many-body techniques

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Superconductivity in S-rich phases of lanthanum sulfide under high pressure

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Physical Review Materials 2022年第6期6卷 064801-064801页

作者： Kun Gao Wenwen Cui Qinfang Wang Jian Hao Jingming Shi Silvana Botti Miguel A. L. Marques Yinwei Li Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China Institut für Festkörpertheorie und -optik Friedrich-Schiller-Universität Jena D-07743 Jena Germany Institut für Physik Martin-Luther-Universität Halle-Wittenberg D-06099 Halle Germany Shandong Key Laboratory of Optical Communication Science and Technology School of Physical Science & Information Technology of Liaocheng University Liaocheng 252059 China

Pressure, a fundamental thermodynamic variable, enables phase transitions to exotic phases with unique physical properties, such as superconductivity. In this work we perform a complete study of crystal structures and relevant electronic properties of La–S crystalline systems in a pressure range of 0–200 GPa. A structural search based on first-principles swarm-intelligence identifies two hitherto unknown pressure-stabilized stoichiometries, namely, LaS3 and LaS5, in addition to the previously reported compounds. We find that the S-S bonding patterns in La–S compounds evolve in the following sequence with increasing S content and pressure: Atomic S, S2 dimers, one-dimensional linear S chains, and two-dimensional S ladders. Further electron-phonon calculations show that both LaS3 and LaS5 are superconductors with critical temperatures of 13.6 K at 100 GPa and 11 K at 120 GPa, respectively. The softened acoustic phonon branches are responsible for their superconductivity. Our current work is expected to guide future experimental studies investigating superconductivity and structural features of La–S system and more, in general, of other rare-earth chalcogenides.

关键词： First-principles calculations Superconducting phase transition Superconductors

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Low-Frequency Noise in Amorphous Indium Zinc Oxide Thin Film Transistors with Aluminum Oxide Gate Insulator

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Chinese physics Letters 2018年第4期35卷 123-126页

作者： Ya-Yi Chen Yuan Liu Zhao-Hui Wu Li Wang Bin Li Yun-Fei En Yi-Qiang Chen School of Electronic and Information Engineering South China University of Technology Cuangzhou 510640 Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Produce Reliability and Environmental Testing Research Institute Guangzhou 510610

Low-frequency noise（LFN） in all operation regions of amorphous indium zinc oxide（a-IZO） thin film transistors（TFTs） with an aluminum oxide gate insulator is investigated. Based on the LFN measured results, we extract the distribution of localized states in the band gap and the spatial distribution of border traps in the gate dielectric,and study the dependence of measured noise on the characteristic temperature of localized states for a-IZO TFTs with Al2 O3 gate dielectric. Further study on the LFN measured results shows that the gate voltage dependent noise data closely obey the mobility fluctuation model, and the average Hooge＇s parameter is about 1.18×10^-*** the relationship between the free carrier number and the field effect mobility, we simulate the LFN using the △N-△μ model, and the total trap density near the IZO/oxide interface is about 1.23×10^18 cm^-3eV^-1.

关键词： Low-Frequency Noise in Amorphous Indium Zinc Oxide Thin Film Transistors with Aluminum Oxide Gate Insulator Al

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Possible signatures of higher dimension in thin accretion disk around brane world black hole

arXiv

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arXiv 2024年

作者： Liu, Ailin He, Tong-Yu Liu, Ming Han, Zhan-Wen Yang, Rong-Jia College of Physics Science and Technology Hebei University Baoding071002 China Yunnan Observatories Chinese Academy of Sciences Kunming650216 China Hebei Key Lab of Optic-Electronic Information and Materials Hebei University Baoding071002 China National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices Hebei University Baoding071002 China Key Laboratory of High-pricision Computation Application of Quantum Field Theory of Hebei Province Hebei University Baoding071002 China

We probe deeply into the characteristics of thin accretion disk surrounding black hole within the brane world paradigm. We investigate how model parameters affect the physical properties of the disk. Our findings indicate that as the tidal charge parameter inherited from the higher dimension increases, the energy flux, the radiation temperature, the spectral cutoff frequency, the spectral luminosity, and the conversion efficiency of the disk all increase, but the radius of the innermost stable circular orbit decreases. Compared to cases of the Kerr and Schwarzschild black holes, the disk is hotter and more luminous for positive tidal charge parameter, while it is cooler and less luminous for negative tidal charge parameter, which suggests the potential for probing possible signatures of higher dimension. © 2024, CC BY-NC-SA.

关键词： Black holes

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A new parametrization of Hubble function and Hubble tension

arXiv

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arXiv 2024年

作者： He, Tong-Yu Yin, Jia-Jun Wang, Zhen-Yu Han, Zhan-Wen Yang, Rong-Jia College of Physics Science and Technology Hebei University Baoding071002 China Yunnan Observatories Chinese Academy of Sciences Kunming650216 China Hebei Key Lab of Optic-Electronic Information and Materials Hebei University Baoding071002 China National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices Hebei University Baoding071002 China Key Laboratory of High-pricision Computation and Application of Quantum Field Theory of Hebei Province Hebei University Baoding071002 China

We present a new parameterized Hubble function and employ observational data from Hubble, Pantheon, and Baryon Acoustic Oscillations to constrain model parameters. The proposed method is thoroughly validated against these datasets, demonstrating a robust fit to the observational data. The obtained best-fit values are H0 = 67.5+1−1.36 km s−1Mpc−1, Ωm0 = 0.2764 ± 0.0094, and α = 0.33 ± 0.22, consistent with the Planck 2018 results, highlighting the existence of Hubble tension. © 2024, CC BY-NC-SA.

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Magnetically induced transition in the spectrum of Sr iv

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Physical Review A 2021年第3期103卷 032831-032831页

作者： M. C. Li K. Wang T. Brage R. Hutton School of Electronic Information and Electrical Engineering Huizhou University Huizhou 516007 China Hebei Key Lab of Optic-electronic Information and Materials The College of Physics Science and Technology Hebei University Baoding 071002 China Division of Mathmatical Physics Department of Physics Lund University 22100 Lund Sweden Shanghai EBIT Laboratory Institute of Modern Physics Fudan University Shanghai 200433 China and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Fudan University Shanghai 200433 China

Observations and studies of what we call magnetic induced transitions have arguably re-opened a whole new area of atomic spectroscopy. There are transitions from upper levels that are sensitive to externally applied magnetic fields, such as those in tokamaks and the solar corona. So far only two types of ionic systems have been confirmed as leading to magnetic induced transitions, namely Ne-like Ar and Fe, and Cl-like Fe. We here propose a homologous system to Cl-like ions, namely Br-like ions, as a new candidate. These transitions are fed by close degeneracy between levels of relative short and long lifetimes, respectively. A similar close degeneracy as in Cl-like Fe is present in Br-like Sr and will give rise to an observable magnetic induced transition. We have predicted the magnetic induced transition rate for the 4D7/2 level in Sr iv as a function of magnetic field strengths.

关键词： Atomic spectra electronic structure of atoms & molecules electronic transitions

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Mechanisms of atmospheric neutron-induced single event upsets in nanometric SOI and bulk SRAM devices based on experiment-verified simulation tool

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Chinese physics B 2018年第6期27卷 336-340页

作者： Zhi-Feng Lei Zhan-Gang Zhang Yun-Fei En Yun Huang Key Laboratory of Low Dimensional Materials ＆ Application Technology of Ministry of Education Xiangtan University Xiangtan 411100 China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610 China

In this paper, a simulation tool named the neutron-induced single event effect predictive platform（NSEEP^2） is proposed to reveal the mechanism of atmospheric neutron-induced single event effect（SEE） in an electronic device, based on heavy-ion data and Monte-Carlo neutron transport simulation. The detailed metallization architecture and sensitive volume topology of a nanometric static random access memory（SRAM） device can be considered to calculate the real-time soft error rate（RTSER） in the applied environment accurately. The validity of this tool is verified by real-time experimental results. In addition, based on the NSEEP^2, RTSERs of 90 nm–32 nm silicon on insulator（SOI） and bulk SRAM device under various ambient conditions are predicted and analyzed to evaluate the neutron SEE sensitivity and reveal the underlying mechanism. It is found that as the feature size shrinks, the change trends of neutron SEE sensitivity of bulk and SOI technologies are opposite, which can be attributed to the different MBU performances. The RTSER of bulk technology is always 2.8–64 times higher than that of SOI technology, depending on the technology node, solar activity, and flight height.

关键词： atmospheric neutron single event effects soft error rate Monte-Carlo simulation

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Pre-trained Language Model based Medical Named Entity Recognition

Pre-trained Language Model based Medical Named Entity Recogn...

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Chinese Automation Congress (CAC)

作者： Zheng Cheng Jiaju Wu Bin Ji Huijun Liu School of Automation University of Electronic Science and Technology of China. Institute of Computer Application China Academy of Engineering Physics Mianyang China College of Civil Aviation Nanjing University of Aeronautics and Astronautic Nanjing China Institute of Computer Application China Academy of Engineering Physics Mianyang China College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9781665426480

Medical named entity recognition is an important part of structuring Chinese electronic medical records and construction of medical knowledge graph. The CCKS2019 conference organized a medical named entity recognition evaluation task to extract six types of medical entities from unstructured Chinese electronic medical records. Based on the data set of this evaluation task, pre-trained language model based entity recognition approaches are studied. First, select the BiLSTM-CRF model based on random initialized word embedding as the baseline system; secondly, apply word2vec to the baseline system; thirdly, apply ELMo to the baseline system. Experimental results show that the pre-trained language model is comparable to the best approach of this evaluation task, and the context-related pre-trained language model performs better.

关键词： Automation Data models Task analysis electronic medical records Context modeling

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Measurement and Crosstalk Analysis of Hexagonal TSV Bundle in 3D ICs

Measurement and Crosstalk Analysis of Hexagonal TSV Bundle i...

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Chenbing Qu Zhangming Zhu Yunfei En Liwei Wang Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute of the Ministry of Industry and Information Technology Guangzhou China School of Microelectronics Xidian University Xi'an China

ISBN: (数字)9781728157337

ISBN: (纸本)9781728157344

Hexagonal ground-shielding through silicon vias (TSVs) in 3D ICs are explored based on measurement and simulation. The measured S-parameters of the TSV-bundle part are successfully extracted by de-embedding technique. The results math well with simulations up to 20GHz. The proposed TSV bundle has a good performance of return and insertion loss. For the hexagonal ground TSV shield system, the crosstalk analysis of neighbor signals in the TSV shield system is made based on the measurements and simulations. The electronic and magnetic field plots show a good capacitive and inductive coupling isolation for the victim signal TSV with shielding ground TSVs. Compared to those coupled-TSVs systems without ground guide, the ground-shielding TSV as well as coaxial TSV has higher noise over the range of frequencies.

关键词： Couplings Three-dimensional displays Magnetic field measurement Crosstalk Scattering parameters Through-silicon vias Integrated circuit modeling

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Seven-coordinated silicon in a SiO2He compound formed under the extreme conditions of planetary interiors

arXiv

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arXiv 2021年

作者： Ding, Shicong Zhang, Pan Yang, Kang Liu, Cailong Hao, Jian Cui, Wenwen Shi, Jingming Li, Yinwei Laboratory of Quantum Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China Shandong Key Laboratory of Optical Communication Science and Technology School of Physical Science & Information Technology of Liaocheng University Liaocheng252059 China

Changes in atomic coordination numbers at high pressures are fundamental to condensed-matter physics because they initiate the emergence of unexpected structures and phenomena. Silicon is capable of forming eight-, nine-, and ten-coordinated structures under compression, in addition to the usual six-coordinated structures. The missing seven-coordinated silicon remains an open question, but here our theoretical study provides evidence for its existence at high pressures. A combination of a crystal-structure prediction method and first-principles calculations allowed prediction of a stable SiO2He compound containing unique SiO7 polyhedrons, which is a configuration unknown in any proposed silica phase. Consequently, seven-coordinated SiO7 is a possible form of silica at high pressures. Further calculations indicate that the SiO2He phase remains energetically stable with a solid character over a wide range of pressures exceeding 607 GPa and temperatures of 0–9000 K, covering the extreme conditions of the core–mantle boundary in super-Earth exoplanets, or even the Solar System’s ice giant planets. Our results may provide theoretical guidance for the discovery of other silicides at high pressures, promote the exploration of materials at planetary core–mantle boundaries, and enable planetary models to be refined. © 2021, CC BY.

关键词： Calculations

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