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Autonomously Tuning Multilayer Thermal Cloak with Variable Thermal Conductivity Based on Thermal Triggered Dual Phase-Transition Metamaterial

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Chinese Physics Letters 2023年第9期40卷 54-60页

作者：娄琦夏明岗 Department of Applied Physics School of PhysicsXi’an Jiaotong UniversityXi’an 710049China moe key laboratory for nonequilibrium synthesis and modulation of condensed matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shaanxi Province key laboratory of Quantum Information and Optoelectronic Quantum Devices School of PhysicsXi’an Jiaotong UniversityXi’an 710049China

Thermal cloaks offer the potential to conceal internal objects from detection or to prevent thermal shock by controlling external heat flow. However, most conventional natural materials lack the desired flexibility and versatility required for on-demand thermal manipulation. We propose a solution in the form of homogeneous multilayer thermodynamic cloaks. Through an ingenious design, these cloaks achieve exceptional and extreme parameters, enabling the distribution of multiple materials in space. We first investigate the effects of important design parameters on the thermal shielding effectiveness of conventional thermal cloaks. Subsequently, we introduce an autonomous tuning function for the thermodynamic cloak, accomplished by leveraging two phase transition materials as thermal conductive layers. Remarkably, this tuning function does not require any energy input. Finite element analysis results demonstrate a significant reduction in the temperature gradient inside the thermal cloak compared to the surrounding background. This reduction indicates the cloak’s remarkable ability to manipulate the spatial thermal field. Furthermore, the utilization of materials undergoing phase transition leads to an increase in thermal conductivity, enabling the cloak to achieve the opposite variation of the temperature field between the object region and the background. This means that, while the temperature gradient within the cloak decreases, the temperature gradient in the background increases. This work addresses a compelling and crucial challenge in the realm of thermal metamaterials, i.e., autonomous tuning of the thermal field without energy input. Such an achievement is currently unattainable with existing natural materials. This study establishes the groundwork for the application of thermal metamaterials in thermodynamic cloaks, with potential extensions into thermal energy harvesting, thermal camouflage, and thermoelectric conversion *** harnessing phonons, our fi

关键词： thermodynamic autonomous Transition

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Rigid Dysprosium(Ⅲ)Single-Molecule Magnets Exhibit Preserved Superparamagnetism in Solution

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Chinese Journal of Chemistry 2022年第5期40卷 563-570页

作者： Xiali Ding Qiancheng Luo Yuanqi Zhai Xufeng Zhang Yi Lv Xinliang Zhang Chao Ke Chao Wu Yanzhen Zheng Frontier Institute of Science and Technology(FIST) State Key Laboratory of Mechanical Behavior for MaterialsMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Key Laboratory of Sustainable Energy and Materials ChemistrySchool of Chemistry and School of PhysicsXi'an Jiaotong University99 Yanxiang RoadXi'anShaanxi710054 China Department of Hepatobiliary Surgery and The First Affiliated Hospital of Xi'an Jiaotong University 277 West Yanta RoadXi'anShaanxi710061 China Department of Spine Surgery Honghui HospitalXi'an Jiaotong University76 Nanguo RoadXi'anShaanxi710054 China Department of Orthopaedics and Trauma Hong Hui HospitalCollege of MedicineXi'an Jiaotong University555 East Youyi RoadXi'anShaanxi710054 China

Molecules with long preserved magnetic moments are perceived as the smallest units for storing bytes,which could bring a new revolution for information ***,the rational design of such molecules remains *** two rigid adamantanol ligand based dysprosium(III)complexes([Dy(1-AdO)_(2)(py)_(5)]BPh_(4)-1 and[Dy(2-AdO)_(2)(py)_(5)]BPh_(4)-2)with pentagonal-bipyramidal coordination geometry and local D5h symmetry were successfully prepared,which display excellent single-molecule magnet(SMM)behavior(U_(eff)≈1835 K,T_(B)_(ZFC)≈24 K,T_(B)^(100s)≈17 K and T_(B)^(H)=23 K for 1;U_(eff)≈1756 K,T_(B)^(ZFC)≈20 K,T_(B)^(100s)≈16 K and T_(B)^(H)=23 K for 2)due to the much weakened vibration in low energy ***,the large energy barriers and high blocking temperatures for these two complexes in solid states are well preserved in *** is never observed in previous studies of SMMs,indicating that the adamantanol is rigid and can be introduced to make the composed molecules stable enough to maintain the solid state magnetic property in solution.

关键词： Molecularmagnets Lanthanide D_(sh)-symmetry Superparamagnetism Solution

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Design,fabrication and optimization of electromagnetic absorption metamaterials

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中国物理B:英文版 2023年第9期32卷 1-14页

作者：娄琦张旭东夏明岗 Department of Applied Physics School of PhysicsXi'an Jiaotong UniversityXi'an 710049China moe key laboratory for nonequilibrium synthesis and modulation of condensed matter School of PhysicsXi'an Jiaotong UniversityXi'an 710049China Shaanxi Province key laboratory of Quantum Information and Optoelectronic Quantum Devices School of PhysicsXi'an Jiaotong UniversityXi'an 710049China

For decades,the rapid development of wireless communication has provided people a smarter way of ***,a significant increase in electromagnetic pollution is an unavoidable *** radar detection in modern warfare has also become an important prerequisite for survival on the *** review provides a comprehensive overview of the current status and types of electromagnetic absorption metamaterials,especially their design and preparation ***,this review focuses on the strategies used to optimize the absorber absorption ***,this review presents a viewpoint on future research on electromagnetic absorption metamaterials,the main challenges that need to be addressed and the possible solutions.

关键词： metamaterial electromagnetic wave absorption fractal design

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Diagnosis of ultrafast ultraintense laser pulse characteristics by machine-learning-assisted electron spin

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matter and Radiation at Extremes 2023年第3期8卷 1-9页

作者： Zhi-Wei Lu Xin-Di Hou Feng Wan Yousef I.Salamin Chong Lv Bo Zhang Fei Wang Zhong-Feng Xu Jian-Xing Li Ministry of Education key laboratory for nonequilibrium synthesis and modulation of condensed matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic DevicesSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Department of Physics American University of SharjahP.O.Box 26666SharjahUnited Arab Emirates Department of Nuclear Physics China Institute of Atomic EnergyP.O.Box 275(7)Beijing 102413China key laboratory of Plasma Physics Research Center of Laser FusionChina Academy of Engineering PhysicsMianshan Rd.64#MianyangSichuan 621900China School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’anShaanxi 710049China

The rapid development of ultrafast ultraintense laser technology continues to create opportunities for studying strong-field physics under extreme ***,accurate determination of the spatial and temporal characteristics of a laser pulse is still a great challenge,especially when laser powers higher than hundreds of terawatts are *** this paper,by utilizing the radiative spin-flip effect,we find that the spin depolarization of an electron beam can be employed to diagnose characteristics of ultrafast ultraintense lasers with peak intensities around 10^(20)–10^(22) W/cm^(2).With three shots,our machine-learning-assisted model can predict,simultaneously,the pulse duration,peak intensity,and focal radius of a focused Gaussian ultrafast ultraintense laser(in principle,the profile can be arbitrary)with relative errors of 0.1%–10%.The underlying physics and an alternative diagnosis method(without the assistance of machine learning)are revealed by the asymptotic approximation of the final spin degree of *** proposed scheme exhibits robustness and detection accuracy with respect to fluctuations in the electron beam *** measurements of ultrafast ultraintense laser parameters will lead to much higher precision in,for example,laser nuclear physics investigations and laboratory astrophysics *** machine learning techniques may also find applications in more general strong-field physics scenarios.

关键词： pulse laser intense

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Enhanced damping capacity of ferromagnetic Fe-Ga alloys by introducing structural defects

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Journal of Materials Science & Technology 2021年第25期84卷 173-181页

作者： Ruihua Qiao Junming Gou Tianzi Yang Yiqun Zhang Feng Liu Shanshan Hu Tianyu Ma Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materialsand MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi’an Jiaotong UniversityXi’an710049China State key laboratory of Solidification Processing and Analytical&Testing Center Northwestern Polytechnical UniversityXi'an710072China School of Materials Science and Engineering Zhejiang UniversityHangzhou310027China

The irreversible motion of magnetic domain walls in ferromagnets can dissipate a large portion of the elastic energy,and the associated damping capacity is proportional to the magnetostriction *** contrast,here we found that the damping capacity of the large magnetostriction Fe-Ga alloys can be enhanced by 2-3 times through introducing structural defects including interfacial dislocations and stacking faults,despite that these defects deteriorate the *** structural defects were introduced by aging the BCC(body-centered-cubic)solution-treated precursor,for which the formation of mechanically harder FCT(face-centered-tetragonal)and/or FCC(face-centered-cubic)phases can result in high-density partial dislocations at the semi-coherent phase interfaces and quasi-periodically stacked nano-layer substructure inside the FCC *** structural defects act as extra damping sources besides the magnetic domain walls because the structural accommodation of the semi-coherent phase interfaces between BCC and FCT/FCC nanoprecipitates with different elastic moduli and the nano-layer substructure towards long-range ordered periodical stacking can dissipate a large portion of mechanical *** findings suggest that introducing structural defects provides fresh freedom to design high damping ferromagnetic materials.

关键词： Ferromagnets Damping capacity Defects Magnetostriction Fe-Ga alloy

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低场诱导液-气界面纳米颗粒组装体自旋玻璃行为和可控各向异性

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Science China Materials 2022年第1期65卷 193-200页

作者：廖晓奇 Seda Ulusoy 黄锐 Erik Wetterskog Klas Gunnarsson 王宇梁华伟曾昱嘉 German Salazar-Alvarez Peter Svedlindh College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Materials Science and Engineering Hanshan Normal UniversityChaozhou 521041China Solid State Physics Department of Materials Science and EngineeringAngstrom LaboratoryUppsala UniversityBox 3575103 UppsalaSweden moe key laboratory for nonequilibrium synthesis and modulation of condensed matter and State key laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

利用纳米尺度结构单元堆积成具有丰富物理性能的一维(1D)组装体,是材料设计的研究前沿.然而,弱磁场诱导1D阵列的制备及其磁性能机制的揭示仍然具有挑战性.本文采用强度不同的组装场(0/1/3/5/30/50 mT),在二甘醇-空气界面上制备了由无序... 详细信息

利用纳米尺度结构单元堆积成具有丰富物理性能的一维(1D)组装体,是材料设计的研究前沿.然而,弱磁场诱导1D阵列的制备及其磁性能机制的揭示仍然具有挑战性.本文采用强度不同的组装场(0/1/3/5/30/50 mT),在二甘醇-空气界面上制备了由无序四氧化三铁纳米立方体组成的低维组装体.随着组装场从0增长到50 mT,环形组装体先变为细长多孔网状,再逐步变为细丝阵列,其中细丝阵列的合成条件为组装场≥3 mT且施加组装场时间t>14 min.通过调控组装场强度可得到自旋玻璃特性和静(动)各向异性~2(3).在弱组装场下磁偶极和无序排列易磁化轴之间相互作用导致自旋玻璃特性,进一步增大组装场将加强磁偶极作用和易磁化轴排列,导致自旋玻璃特性消失和强各向异性.本研究不仅提出了一种制备自旋玻璃和可控各向异性组装体的策略,还为理解低维组装磁相互作用提供了新思路.

关键词：纳米立方体空气界面自旋玻璃纳米颗粒各向异性组装体四氧化三铁磁相互作用

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Improving Ferro- and Piezo- Electric Properties of Hydrogenized Poly(vinylidene fluoride-trifluoroethylene) Films by Annealing at Elevated Temperatures

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Chinese Journal of Polymer Science 2016年第5期34卷 649-658页

作者： Jian Wang Zhong Li Yuan Yan Xiao Wang 解云川张志成 Department of Applied Chemistry MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterSchool of ScienceXi'an Jiaotong UniversityXi'an 710049China College of Material Science and Engineering Xi'an University of Science and TechnologyXi'an 710054China School of Electronic and Information Engineering Xi'an Jiaotong UniversityXi'an 710049China

After annealing the solution cast P（VDF-TrFE） films at elevated temperatures, which were synthesized via a full hydrogenation process from P（VDF-CTFE） with a composition of VDF/TrFE = 80/20（mol%）, a series of P（VDF-TrFE） films were fabricated in present work. The crystalline and ferroelectric phases of the films were carefully characterized and their dielectric, ferroelectric and piezoelectric properties were systematically investigated. The improved crystalline and ferroelectric phases in the films induced by annealing at elevated temperatures are responsible for the significant improved electric properties of the films. The optimized annealing temperature is found to be 130 ℃ and the best performance including the highest dielectric constant of 12.5 at 1 kHz, the largest maximum polarization of 11.21 μC/cm^2 and remnant polarization of 7.22 μC/cm^2, the lowest coercive electric field of 56 MV/m, and the highest piezoelectric coefficient of -25 pC/N is observed.

关键词： ferroelectric annealing crystalline dielectric fluoride systematically piezoelectric annealed remnant Annealing

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Generation of highly-polarized high-energy brilliant γ-rays via laser-plasma interaction

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matter and Radiation at Extremes 2020年第5期5卷 30-37页

作者： Kun Xue Zhen-Ke Dou Feng Wan Tong-Pu Yu Wei-Min Wang Jie-Ru Ren Qian Zhao Yong-Tao Zhao Zhong-Feng Xu Jian-Xing Li moe key laboratory for nonequilibrium synthesis and modulation of condensed matter School of ScienceXi’an Jiaotong UniversityXi’an 710049China Department of Physics National University of Defense TechnologyChangsha 410073China Department of Physics and Beijing key laboratory of Opto-Electronic Functional Materials and Micro-Nano Devices Renmin University of ChinaBeijing 100872China

The generation of highly polarized high-energy brilliantγ-rays via laser–plasma interaction is investigated in the quantum radiation-reaction *** employ a quantum electrodynamics particle-in-cell code to describe spin-resolved electron dynamics semiclassically and photon emission and polarization quantum mechanically in the local constant field *** an ultrastrong linearly polarized(LP)laser pulse irradiates a near-critical-density(NCD)plasma followed by an ultrathin planar aluminum target,the electrons in the NCD plasma are first accelerated by the driving laser to ultrarelativistic energies and then collide head-on with the laser pulse reflected by the aluminum target,emitting brilliant LPγ-rays via nonlinear Compton scattering with an average polarization of about 70%and energy up to hundreds of ***γ-rays can be produced with currently achievable laser facilities and will find various applications in high-energy physics and laboratory astrophysics.

关键词： polarized quantum interaction

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Site-Selective Magnetic Moment Collapse in Compressed Fe5O6

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Chinese Physics Letters 2021年第8期38卷 201-205页

作者：秦巧英杨爱芹陶相如杨留响缑慧阳张朋 moe key laboratory for nonequilibrium synthesis and modulation of condensed matter School of PhysicsXi'an Jiaotong University Center for High Pressure Science and Technology Advanced Research

Iron oxide is one of the most important components in the Earth’s *** recent discovery of the stable presence of Fe5O6in the Earth’s mantle environment has stimulated significant interests in understanding of this new category of iron *** report the electronic structure and magnetic properties of Fe5O6calculated by the density functional theory plus dynamic mean field theory(DFT+DMFT) *** calculations indicate that Fe5O6is a conductor at ambient pressure with dominant Fe-3 d density of states at the Fermi *** magnetic moments of iron atoms at three non-equivalent crystallographic sites in Fe5O6collapse at significantly different rates under *** site-selective collapse of magnetic moments originates from the shifting of energy levels and the consequent charge transfer among the Fe-3 d orbis when Fe5O6is being *** simulations suggest that there could be high conductivity and volume contraction in Fe5O6at high pressure,which may induce anomalous features in seismic velocity,energy exchange,and mass distribution in the deep interior of the Earth.

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Defect levels in d-electron containing systems:Comparative study of CdTe using LDA and LDA+U

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Journal of Semiconductors 2020年第10期41卷 70-74页

作者： Yuan Yin Yu Wang Guangde Chen Yelong Wu College of Physics and Optoelectronic Technology Advanced Titanium Alloys and Functional Coatings Cooperative Innovation CenterBaoji University of Arts and SciencesBaoji 721013China Department of Applied Physics and the moe key laboratory for nonequilibrium synthesis and modulation of condensed matter Xi’an Jiaotong UniversityXi’an 710049China

The defect properties in d-electron containing materials will be strongly influenced by the non-negligible on-site Coulomb ***,this has been omitted in the current widely adopted standard first-principles calculations,such as LDA,leading to a large deviation of calculated ***,as a comparative case study,in this paper the defects of Cd Te are investigated by first-principles calculations including standard LDA and LDA+U,and we find that LDA+U gives more accurate formation energies of the neutral point defects than the standard *** same trend can be found in transition energies of the charged state defects as *** comparative analyses show that LDA+U gives better results for the defects of Cd Te than the standard LDA and requires less computing resource than LAPW,indicating it should have huge potential to model supercells with large number of atoms and strong electron ***,a new anion interstitial defect structure is found to be more stable than the well-known tetrahedron central anion interstitial defect structure Te_i^a.

关键词： defects LDA LDA+U formation energy transition energy first-principles

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