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Pressure evolution in shock-compacted granular media

Petroleum science 2023年第6期20卷 3736-3751页

作者： Jia-Rui Li Jun-Sheng Zeng Kun Xue State Key Laboratory of Explosive Science and Technology Beijing Institute of TechnologyBeijing100081China Institute of Applied Physics and Computational Mathematics Beijing100094China

The pressure evolution associated with the transient shock-induced infiltration of gas flow through granular media consisting of mobile particles is numerically investigated using a coupled Eulerian–Lagrangian *** coupling between shock compaction and interstitial flow has been revealed.A distinctive two-stage diffusing pressure field with deflection occurring at the tail of the compaction front is found,with corresponding spikes in both gaseous velocity and temperature profiles emerging within the width of the compaction *** compaction front,together with the deflection pressure,reaches a steady state during the later *** analytical prediction of the steady deflection pressure that considers the contributions of porosity and the non-isothermal effect is *** isothermal single-phase method we developed,combining the porosity jump condition across the compaction front,shows consistent pressure evolution with the non-isothermal CMP-PIC one under weak shock strength and low column ***,the microscale mechanism governing the formation of not only pressure deflection but also gaseous velocity and temperature spikes within the width of the compaction front has been *** aforementioned evolutions of the flow field are shown to arise from the nozzling effects associated with the particle-scale variations in the volume fraction.

关键词： Shock compaction Pressure evolution Transport in porous media Transient gas infiltration Mobile granular column

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Tunable quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures

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national science Review 2024年第3期11卷 100-107页

作者： Feng Xue Yusheng Hou Zhe Wang Zhiming Xu Ke He Ruqian Wu Yong Xu Wenhui Duan Beijing Academy of Quantum Information Sciences State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices Center for Neutron Science and Technology School of Physics Sun Yat-sen University State Key Laboratory of Surface Physics Key Laboratory of Computational Physical Sciences and Department of PhysicsFudan University Frontier Science Center for Quantum Information Department of Physics and Astronomy University of California-Irvine Tencent Quantum Laboratory Tencent Technology(Shenzhen)Co.Ltd RIKEN Center for Emergent Matter Science(CEMS) Institute for Advanced Study Tsinghua University

The quantum anomalous Hall effect（QAHE） has unique advantages in topotronic applications, but it is still challenging to realize the QAHE with tunable magnetic and topological properties for building functional devices. Through systematic first-principles calculations, we predict that the in-plane magnetization induced QAHE with Chern numbers C = ±1 and the out-of-plane magnetization induced QAHE with high Chern numbers C = ±3 can be realized in a single material candidate, which is composed of van der Waals（vdW）coupled Bi and MnBi2Te4monolayers. The switching between different phases of QAHE can be controlled in multiple ways, such as applying strain or（weak） magnetic field or twisting the vdW materials. The prediction of an experimentally available material system hosting robust, highly tunable QAHE will stimulate great research interest in the field. Our work opens a new avenue for the realization of tunable QAHE and provides a practical material platform for the development of topological electronics.

关键词： quantum anomalous Hall effect topological quantum phase transition van der Waals heterostructures tunable Chern number high Chern number

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Advances in the kinetics of heat and mass transfer in near-continuous complex flows

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Frontiers of physics 2024年第4期19卷 187-234页

作者：许爱国张德佳甘延标 National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009-26Beijing 100088China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China National Key Laboratory of Shock Wave and Detonation Physics Mianyang 621999China Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle School of Liberal Arts and SciencesNorth China Institute of Aerospace EngineeringLangfang 065000China

The study of macro continuous flow has a long ***,the exploration of heat and mass transfer in small systems with a particle number of several hundred or less has gained significant interest in the fields of statistical physics and nonlinear ***,due to absence of suitable methods,the understanding of mesoscale behavior situated between the aforementioned two scenarios,which challenges the physical function of traditional continuous fluid theory and exceeds the simulation capability of microscopic molecular dynamics method,remains considerably *** greatly restricts the evaluation of effects of mesoscale behavior and impedes the development of corresponding regulation *** access the mesoscale behaviors,there are two ways:from large to small and from small to *** the necessity to interface with the prevailing macroscopic continuous modeling currently used in the mechanical engineering community,our study of mesoscale behavior begins from the side closer to the macroscopic continuum,that is from large to *** on some fundamental challenges encountered in modeling and analysis of near-continuous flows,we review the research progress of discrete Boltzmann method(DBM).The ideas and schemes of DBM in coarse-grained modeling and complex physical field analysis are *** relationships,particularly the differences,between DBM and traditional fluid modeling as well as other kinetic methods are *** verification and validation of the method,some applied researches including the development of various physical functions associated with discrete and non-equilibrium effects are *** directions of DBM related studies are indicated.

关键词： near-continuous flow non-equilibrium kinetics discrete Boltzmann method complex physical field analysis

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Experimental realization of Wheeler's delayed-choice experiment with dual selections

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science China(physics,Mechanics & Astronomy) 2025年第5期68卷 44-50页

作者： Xiaowan Yang Xinglei Yu Liangsheng Li Xinzhi Zhao Tianle Zheng Chengjie Zhang Chuan-Feng Li Guang-Can Guo School of Physical Science and Technology Ningbo UniversityNingbo 315211China National Key Laboratory of Scattering and Radiation Beijing 100854China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Wheeler's delayed-choice experiment demonstrates wave-particle duality of particles using different experimental configurations of a Mach-Zehnder *** a quantum version of this experiment,the wave-particle behaviour of photons can be observed by controlling presence or absence of the second beam ***,we implement a delayed-choice experiment with dual selections based on entangled photons,experimentally controlling both of two beam splitters in the Mach-Zehnder interferometer,where the presence and absence of the second beam splitter are simultaneously controlled through path *** experiment reveals the wave-particle behavior of single photons under different configurations of two beam *** further discuss the scenario when two beam splitters are in a quantum superposition of being present and absent,photons will be in a wave-particle quantum superposition state.

关键词： delayed choice quantum entanglement wave-particle duality

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Nonequilibrium kinetics effects in Richtmyer–Meshkov instability and reshock processes

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Communications in Theoretical physics 2023年第11期75卷 99-114页

作者： Yiming Shan Aiguo Xu Lifeng Wang Yudong Zhang National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid PhysicsChina Academy of Engineering PhysicsMianyang 621900China Center for Applied Physics and Technology MOE Key Center for High Energy Density Physics SimulationsCollege of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China

Kinetic effects in the inertial confinement fusion ignition process are far from *** this work,we study the Richtmyer-Meshkov instability and reshock processes by using a two-fluid discrete Boltzmann *** work begins by interpreting the experiment conducted by Collins and Jacobs(2002,*** Mech.464,113-136).It shows that the shock wave causes substances in close proximity to the substance interface to deviate more significantly from their thermodynamic equilibrium *** thermodynamic non-equilibrium(TNE)quantities exhibit complex but inspiring kinetic effects in the shock process and behind the shock *** kinetic effects are detected by two sets of TNE *** first set includes∣Δ_(2)^(*)∣,∣Δ_(3,1)^(*),∣Δ_(3)^(*)∣,and∣Δ_(4,2)^(*)∣,which correspond to the intensities of the non-organized momentum Flux(NOMF),Non-Organized Energy Flux(NOEF),the flux of NOMF and the flux of *** four TNE measures abruptly increase in the shock *** second set of TNE quantities includes■_(NOMF),■_(NOEF)and■_(sum),which denote the entropy production rates due to NOMF,NOEF and their summation,*** mixing zone is the primary contributor to■_(NOEF),while the flow field region outside of the mixing zone is the primary contributor to■_(NOMF).Additionally,each substance exhibits different behaviors in terms of entropy production rate,and the lighter fluid has a higher entropy production rate than the heavier fluid.

关键词： Richtmyer-Meshkov instability discrete Boltzmann method nonequilibrium kinetics effects

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CO adsorption, activation, and oxidation on CeO_(2)(111)-supported Fe model catalyst surfaces

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Nano Research 2025年第2期18卷 111-119页

作者： Xingwang Cheng Yi Tu Dongling Zhang Dong Han Luchao Huang Jun Hu Honghe Ding Qian Xu Junfa Zhu National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Department of Chemical Physics Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutesand Key Laboratory of Precision and Intelligent ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Elucidating the synergistic effect of Fe on CeO_(2) is challenging in CO-related reactions but attractive owing to the improvement in the oxygen storage/release capacity of ceria with the addition of ***,using CeO_(2)(111)-supported Fe model catalysts,CO adsorption,activation,and oxidation on catalyst surfaces was carefully investigated using synchrotron radiation photoemission spectroscopy(SRPES),temperature-programmed desorption(TPD),and infrared reflection absorption spectroscopy(IRRAS).The precursorπ-bonding state for CO dissociative adsorption has been identified through unusually low CO vibration frequencies and a low 0 ML 0.6 ML Top sites Bridge sites MS intensity 1.0 MLπ-bond state 2.0 ML Fe 3p hv=180 eV 100 L CO on 1.6 ML Fe/CeO_(2)(111)54.7 eV Fe^(2+)53.3 eV Fe 01142 cm−1 Recombination desorption Intensity(a.u.)Clean 100 L 150 K 200 K 250 K 300 K 400 K 600 K 100200300400500600700 Temperature(K)6058565452 Binding energy(eV)50 dissociation temperature on Fe/CeO_(2)(111)*** is oxidized by dissociated atomic O followed by the Langmuir–Hinshelwood mechanism,whereas the lattice oxygen of CeO_(2) exhibits low *** CO_(2) yield displays a volcanic curve as a function of Fe *** the 0.6 ML Fe/CeO_(2) surface,weakly bound atomic O on Fe^(2+)results in the best catalytic *** on high Fe coverage surfaces,the CO_(2) yield is limited due to the capture of atomic O by *** results provide comprehensive insights into the adsorption,activation,and oxidation of CO on Fe/CeO_(2) and identify the reaction mechanism,and the active site,which provides deeper insights into CO-related reaction mechanisms over CeO_(2) supported Fe catalysts.

关键词： iron/ceria model catalyst adsorption activation oxidation

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Heteronuclear Magnetisms with Ultracold Spinor Bosonic Gases in Optical Lattices

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Chinese physics Letters 2024年第2期41卷 69-82页

作者： Yongqiang Li Chengkun Xing Ming Gong Guangcan Guo Jianmin Yuan Department of Physics National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Extreme Matter and Applications National University of Defense TechnologyChangsha 410073China Key Lab of Quantum Information(CAS) University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Department of Physics Graduate School of China Academy of Engineering PhysicsBeijing 100193China

Motivated by recent realizations of spin-1 NaRb mixtures in the experiments[***.114,255301(2015);***.128,223201(2022)],we investigate heteronuclear magnetism in the Mott-insulating *** from the identical mixtures where the boson statistics only admits even parity states from angular momentum composition,for heteronuclear atoms in principle all angular momentum states are allowed,which can give rise to new magnetic *** various magnetic phases can be developed over these degenerate spaces,the concrete symmetry breaking phases depend on not only the degree of degeneracy but also the competitions from many-body *** unveil these rich phases using the bosonic dynamical mean-field theory *** phases are characterized by various orders,including spontaneous magnetization order,spin magnitude order,singlet pairing order,and nematic order,which may coexist specially in the regime with odd *** we address the possible parameter regimes for observing these spin-ordered Mott phases.

关键词： parity momentum allowed

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Polaron interfacial entropy as a route to high thermoelectric performance in DAE-doped PEDOT:PSS films

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national science Review 2024年第3期11卷 259-270页

作者： Jiajia Zhang Caichao Ye Genwang Wei Liang Guo Yuhang Cai Zhi Li Xinzhi Wu Fangyi Sun Qikai Li Yupeng Wang Huan Li Yuchen Li Shuaihua Wang Wei Xu Xuefeng Guo Wenqing Zhang Weishu Liu Department of Materials Science and Engineering Southern University of Science and Technology Academy for Advanced Interdisciplinary Studies and Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Department of Mechanical and Energy Engineering Southern University of Science and Technology Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences College of Chemistry and Molecular Engineering National Biomedical Imaging Centre Peking University Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology

Enhancing the thermoelectric transport properties of conductive polymer materials has been a long-term challenge, in spite of the success seen with molecular doping strategies. However, the strong coupling between the thermopower and the electrical conductivity limits thermoelectric performance. Here, we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS(poly（3,4-ethylenedioxythiophene）-poly（4-styrenesulfonate）) thin film by using photochromic diarylethene（DAE） dopants coupled with UV-light modulation. With a 10-fold enhancement of the thermopower from 13.5 μV K-1to 135.4 μV K-1and almost unchanged electrical conductivity, the DAE-doped PEDOT:PSS thin film achieved an extremely high power factor of 521.28 μW m-1K-2from an original value of 6.78 μW m-1K-2. The thermopower was positively correlated with the UV-light intensity but decreased with increasing temperature, indicating resonant coupling between the planar closed DAE molecule and PEDOT. Both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling. Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film.

关键词： thermoelectric PEDOT: PSS interfacial occupied entropy resonant coupling UV-light modulation

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Surface tension effects on Rayleigh-Taylor instability in nonideal fluids:A multiple-relaxation-time discrete Boltzmann study

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science China(physics,Mechanics & Astronomy) 2024年第12期67卷 87-105页

作者： Feng Chen Aiguo Xu Jiahui Song Yanbiao Gan Yudong Zhang Ning Guan School of Aeronautics Shan Dong Jiaotong UniversityJinan 250357China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing100871China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing100081China National Key Laboratory of Shock Wave and Detonation Physics Mianyang621999China School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle North China Institute of Aerospace EngineeringLangfang065000China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou450001China

A multi-relaxation-time discrete Boltzmann model for compressible non-ideal gases with adjustable specific heat ratio is proposed,and the impact of surface tension on Rayleigh-Taylor instability(RTI)is investigated from two perspectives:macroscopic and non-equilibrium *** terms of physical cognition,(1)it is found that there are two critical surface tensions:the upper critical value and the lower critical *** the surface tension is below the lower critical value,the RTI evolution aligns qualitatively with the case without surface *** the surface tension coefficient increases,the inhibitory effect on RTI evolution gradually *** the surface tension is greater than the upper critical value,the disturbance interface tends to be stable after multiple *** the surface tension is in between,the perturbation interface first reverses,or even multiple reverses,and then destabilizes and develops rapidly.(2)A series of new kinetic behavior characteristics are given,and it is found that some behavior characteristics have important reference value for the control of system *** example,the first peak in the growth rate of the global average non-organized momentum flux strength D_(2)corresponds to the onset of the regular nonlinear *** peak in the growth rate of the global average non-organized energy flux strength D_(3,1)marks the beginning of the re-acceleration *** onset of the uniform acceleration stage in the growth rate of the global average nonequilibrium strength D_(T NE)corresponds to the system transitioning into the regular nonlinear stage,while its terminal point(also the peak)corresponds to the system entering the re-acceleration *** insights enhance understanding of RTI mechanisms in complex fluids kinetically.

关键词： statistical mechanics of classical fluids flow instabilities kinetic theory

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Spin Resolved Zero-Line Modes in Minimally Twisted Bilayer Graphene from Exchange Field and Gate Voltage

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Chinese physics Letters 2024年第7期41卷 111-116页

作者： Sanyi You Jiaqi An Zhenhua Qiao International Centre for Quantum Design of Functional Materials CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The reliance on spin-orbit coupling or strong magnetic fields has always posed significant challenges for the mass production and even laboratory realization of most topological materials. Valley-based topological zero-line modes have attracted widespread attention due to their substantial advantage of being initially realizable with just an external electric field. However, the uncontrollable nature of electrode alignment and precise fabrication has greatly hindered the advancement in this field. By utilizing minimally twisted bilayer graphene and introducing exchange fields from magnetic substrates, we successfully realize a spin-resolved, electrode-free topological zeroline mode. Further integration of electrodes that do not require alignment considerations significantly enhances the tunability of the system's band structure. Our approach offers a promising new support for the dazzling potential of topological zero-line mode in the realm of low-energy-consumption electronics.

关键词： structure field topological

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