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Ground-state mass of ^(22)Al and test of state-of-the-art ab initio calculations

Chinese physics C 2024年第3期48卷 72-78页

作者：孙铭泽于越王新鹏王猛李健国张玉虎 K.Blaum 陈祖毅陈瑞九邓涵宇付超义葛文文黄文嘉焦红扬李红蕙李宏福罗胤芳廖挺 YuALitvinov 司敏帅鹏史金阳王茜邢元明徐星徐瑚珊许甫荣袁琪 T.Yamaguchi 颜鑫亮杨建成原有进周小红周旭张敏曾奇 CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Max-Planck-Institut für Kernphysik Saupfercheckweg 169117 HeidelbergGermany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 164291 DarmstadtGermany Advanced Energy Science and Technology Guangdong Laboratory Huizhou516007China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Department of Physics Saitama UniversitySaitama 338-8570Japan School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

The ground-state mass excess of the T_(z)=−2 drip-line nucleus ^(22)Al is measured for the first time as 18103(10)keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ring in *** new mass excess value allowed us to determine the excitation energies of the two low-lying 1+states in ^(22)Al with significantly reduced uncertainties of 51 *** compared to the analogue states in its mirror nucleus ^(22)F,the mirror energy differences of the two 1^(+)states in the ^(22)Al-^(22)F mirror pair are determined to be−625(51)keV and−330(51)*** excitation energies and mirror energy differences are used to test the state-of-the-art ab initio valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field *** mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of theπs_(1/2) orbital.

关键词： nuclear mass Bρ-defined IMS mirror energy difference ab initio VS-IMSRG calculations chiral interactions

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Mechanical Behavior and Microstructure Evolution during Tensile Deformation of Twinning Induced Plasticity Steel Processed by Warm Forgings

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Journal of Wuhan University of technology(Materials Science) 2024年第2期39卷 417-424页

作者：王文 ZHAO Modi WANG Xingfu 汪聃韩福生 School of Aerospace and Mechanical Engineering Flight College Changzhou Institute of TechnologyChangzhou 213032China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China School of Physics and Electronic Information Yan’an UniversityYan’an 716000China

The mechanical behavior and microstructural evolution of an Fe-30Mn-3Al-3Si twinninginduced plasticity(TWIP)steel processed using warm forging was *** is found that steel processed via warm forging improves comprehensive mechanical properties compared to the TWIP steel processed via cold rolling,with a high tensile strength(R_(m))of 793 MPa,a yield strength(R_(P))of 682 MPa,an extremely large R_(P)/R_(m)ratio as high as 0.86 as well as an excellent elongation rate of 46.8%.The microstructure observation demonstrates that steel processed by warm forging consists of large and elongated grains together with fine,equiaxed *** micro-defect configurations were also observed within the steel,including dense dislocation networks and a few coarse deformation *** the plastic deformation proceeds,the densities of dislocations and deformation twins significantly ***,a great number of slip lines could be observed in the elongated *** findings reveal that a much more dramatic interaction between microstructural defect and dislocations glide takes place in the forging sample,wherein the fine and equiaxed grains propagated dislocations more rapidly,together with initial defect configurations,are responsible for enhanced strength ***,larger,elongated grains with more prevalently activated deformation twins result in high plasticity.

关键词： TWIP steel twinning mechanical property deformation mechanism microstructure

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Low-temperature-pyrolysis preparation of nanostructured graphite towards rapid potassium storage with high initial Coulombic efficiency

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Nano Research 2024年第6期17卷 5138-5147页

作者： Jingke Ren Boyu Xing Wen Luo Binyang Luo Xinfei Wu Xin Yan Wencong Feng Feiyue Wang Chaojie Cheng Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan 430070China

Industrially prepared artificial graphite(AG)is attractive for potassium-ion batteries(PIBs),but its rate performance is poor and the production process is energy intensive,so developing an efficient strategy to produce novel graphite with low energy consumption and high performance is economically ***,a nanostructured graphite composed of multi-walled carbon nanotubes(MWCNTs)and graphite shells was prepared by one-pot method through low-temperature pyrolysis of iron-based metal-organic framework(MOF)and carbon *** high graphitization degree of nanostructured graphite makes the initial Coulombic efficiency(ICE)exceed 80%,and the three-dimensional(3D)conductive network ensures a specific capacity of 234 mAh·g^(−1)after 1000 cycles at a high current density of 500 mA·g^(−1).In addition,the typical graphite potassium storage mechanism is also demonstrated by in situ X-ray diffraction(XRD)and in situ Raman spectroscopy,and its practicality is also proved by the voltage of the full *** work provides a feasible way to optimize the practical production process of AG and expand its application in energy storage.

关键词： graphite anode potassium-ion batteries high graphitization degree low-temperature pyrolysis initial Coulombic efficiency

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Spin fluctuations and orbital-selective superconductivity in Ba_(2)CuO_(4-y):A FLEX study

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Chinese physics B 2024年第12期33卷 154-165页

作者： Pei-Jun Zheng Ya-Min Quan Liang-Jian Zou Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China

Recently discovered Ba_(2)CuO_(4-y)provides new perspectives to the study of high-temperature ***,little is known about the spin dynamics of this *** this work,we employ the fluctuation exchange(FLEX)approximation within the framework of spin-fluctuation mediated superconductivity to examine the behavior of the spin fluctuations of a two-orbital Hubbard model for Ba_(2)CuO_(4-y).Our calculations reveal an extraordinary spin resonance mode coupled to the superconducting state in the hole-underdoped ***,we confirm that the coupling between the electrons and this resonance mode can lead to a dip-like feature in the electronic spectrum as a feedback *** the hole-overdoped regime,by incorporating self energy into our calculations,we obtain orbital-dependent renormalizations and show how these self-energy effects can lead to the detailed gap structures and the orbital-selective superconductivity,which could not be obtained in a previous study using random phase approximation(RPA).This research may shed new light on searching for unconventional superconductors with higher transition temperatures.

关键词： fluctuation exchange approximation spin fluctuation spectrum spin resonance peak

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ARPES investigation of the electronic structure and its evolution in magnetic topological insulator MnBi2+2nTe4+3n family

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National Science Review 2024年第2期11卷 81-93页

作者： Runzhe Xu Lixuan Xu Zhongkai Liu Lexian Yang Yulin Chen State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua University School of Physical Science and Technology Shanghai Tech University and CAS-Shanghai Science Research Center Shanghai Tech Laboratory for Topological Physics Frontier Science Center for Quantum Information Collaborative Innovation Center of Quantum Matter Department of Physics Clarendon LaboratoryUniversity of Oxford

In the past 5 years,there has been significant research interest in the intrinsic magnetic topological insulator family compounds MnBi2+2nTe4+3n（where n=0,1,2…）.In particular,exfoliated thin films of MnBi2Te4have led to numerous experimental breakthroughs,such as the quantum anomalous Hall effect,axion insulator phase and high-Chern number quantum Hall effect without Landau ***,despite extensive efforts,the energy gap of the topological surface states due to exchange magnetic coupling,which is a key feature of the characteristic band structure of the system,remains experimentally *** electronic structure measured by using angle-resolved photoemission （ARPES） shows significant deviation from ab initio prediction and scanning tunneling spectroscopy measurements,making it challenging to understand the transport results based on the electronic *** paper reviews the measurements of the band structure of MnBi2+2nTe4+3nmagnetic topological insulators using ARPES,focusing on the evolution of their electronic structures with temperature,surface and bulk doping and film *** aim of the review is to construct a unified picture of the electronic structure of MnBi2+2nTe4+3ncompounds and explore possible control of their topological properties.

关键词： magnetic topological insulator MnBi2Te4 electronic structure angle-resolved photoemission spectroscopy

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Effective integration of highly-efficient focusing apodized grating and quantum dots on a solid substrate for scalable quantum photonic circuits

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Science China(physics,Mechanics & Astronomy) 2024年第9期67卷 99-107页

作者： Beimeng Yao Rongbin Su Shunfa Liu Changkun Song Ying Yu Jin Liu Xuehua Wang State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

Recent advancements in quantum photonic circuits have significantly influenced the field of quantum information *** pursuit of an integrated quantum photonic circuit that offers an active,stable platform for large-scale integration and high processing efficiency remains a key *** grating coupler,as a crucial element for an efficient transformation output interface in the integrated quantum photonic circuits,presents significant potential for practical ***,we demonstrate the integration block of a highly efficient shallow-etched focusing apodized grating coupler with indium arsenide(InAs)quantum dots(QDs)in gallium arsenide(GaAs)on a SiO2substrate for active quantum photonic *** designed grating couplers possess a high efficiency over 90% in the broadband(900-930 nm)from the circuit to free space,and a nearly-perfect match with the fiber ***,the efficiency to free space reaches 81.8%,and the match degree with the fiber mode is high up to 92.1%.The proposed integration block offers the potential for large-scale integration of active quantum photonic circuits due to its stable solid substrate and highly performant output for quantum measurements.

关键词： quantum dot grating coupler wafer bonding quantum photonic circuit

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Central role of d-band energy level in Cu-based intermetallic alloys

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npj Computational Materials 2024年第1期10卷 2497-2504页

作者： Jing Zhao Wenming Xia Zhi Zeng Xianlong Wang Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China

Cu-Au intermetallic alloys are classic paradigms in the history of alloy theory for studying orderdisorder transition,phase stability,and so ***,density functional theory with a generalized gradient approximation(GGA)fails to describe their formation energies and Au-rich ground states,e.g.,calculated formation energies are nearly 40%smaller than experimental *** this work,we found that these discrepancies,which are also common in other Cu-transition metal(TM)intermetallic alloys,are actually caused by the fact that GGA produces Cu-3d bands with a shallower energy level than the experimental results,leading to incorrect d-d *** using the Hubbard U correction to adjust the d-bands to the correct position,the discrepancies in GGA calculations are *** finding that the correct d-bands position is the key to characterize Cu-TMs,which can be achieved efficiently by applying the Hubbard U correction.

关键词： intermetallic alloys alloy

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Squeezing microwaves by magnetostriction

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National Science Review 2023年第5期10卷 208-214页

作者： Jie Li Yi-Pu Wang Jian-Qiang You Shi-Yao Zhu Interdisciplinary Center of Quantum Information Zhejiang Province Key Laboratory of Quantum Technology and Deviceand State Key Laboratory of Modern Optical InstrumentationSchool of PhysicsZhejiang University

Squeezed light finds many important applications in quantum information science and quantum metrology,and has been produced in a variety of physical systems involving optical non-linear ***,we show how a non-linear magnetostrictive interaction in a ferrimagnet in cavity magnomechanics can be used to reduce quantum noise of the electromagnetic *** show optimal parameter regimes where a substantial and stationary squeezing of the microwave output field can be *** of the scheme is within reach of current technology in cavity electromagnonics and *** work provides a new and practicable approach for producing s queezed vacuum states of electromagnetic fields,and may find promising applications in quantum information processing and quantum metrology.

关键词： squeezing of quantum noise cavity magnonics magnomechanics

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Atomistic simulation of{0001}<1210>crack propagation with Nb precipitates inα-Zr

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Rare Metals 2023年第5期42卷 1663-1669页

作者： Hua Ji Jian Yin Guo Wei Wen-Sheng Lai Bai-Xin Liu Jian-Bo Liu Suzhou Nuclear Power Research Institute Suzhou215004China School of Physics and Technology Center for Ion Beam Applicationand Hubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan430072China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

The fracture characteristics of Zr alloys significantly impact the performance of fuel cladding tubes in pressurized water reactors of nuclear power *** this study,molecular dynamics(MD)simulations were performed to investigate the{0001}(1210)crack propagation inα-*** influence of temperature and Nb precipitates on the crack propagation was investigated.A total of 469tensile simulations were *** innovative approach to study the interaction between crack propagation and second-phase particles in the crystals was adopted,which could effectively capture the interaction of secondphase particles with dislocations and twins generated during crack *** the simulation,{1126}<1121>and{1012}<1011>twins were observed during crack propagation with Nb precipitates in the *** simulation results revealed that the Nb precipitates further resisted crack propagation,especially those with a radius of approximately 2 *** addition,the Nb precipitates in the extension direction of the{1026}<1121>twin exhibited higher resistance to crack propagation than those at other locations.

关键词： Zirconium alloys Crack propagation Twinning Nb precipitates Molecular dynamic(MD)simulation

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Possibility of reaching the predicted center of the“island of stability”via the radioactive beam-induced fusion reactions

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nuclear Science and Techniques 2024年第9期35卷 186-195页

作者： Ming-Hao Zhang Ying Zou Mei-Chen Wang Gen Zhang Qing-Lin Niu Feng-Shou Zhang The Key Laboratory of Beam Technology of Ministry of Education School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China School of Physical Science and Technology Guangxi UniversityNanning 530004China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Based on the dinuclear system model,the synthesis of the predicted double-magic nuclei^(298)Fl and 304120 was investigated via neutron-rich radioactive beam-induced fusion *** reaction^(58)Ca+^(244)Pu is predicted to be favorable for producing^(298)Fl with a maximal ER cross section of 0.301 *** of the entrance channel effect reveal that the^(244)Pu target is more promising for synthesizing^(298)Fl than the neutron-rich targets^(248)Cm and^(249)Bk,because of the influence of the Coulomb *** the synthesis of 304120,the maximal ER cross section of 0.046 fb emerges in the reaction^(58)V+^(249)Bk,indicating the need for further advancements in both experimental facilities and reaction mechanisms.

关键词： Superheavy nuclei Dinuclear system model Fusion reaction Double-magic nucleus Radioactive beam

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