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Driving forces for ultrafast laser-induced sp^(2) to sp^(3) structural transformation in graphite

npj Computational Materials 2023年第1期9卷 1591-1597页

作者： Chenchen Song Mengxue Guan Yunzhe Jia Daqiang Chen Jiyu Xu Cui Zhang Sheng Meng Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences100190 BeijingChina School of Physical Sciences University of Chinese Academy of Sciences100049 BeijingChina Songshan Lake Materials Laboratory 523808 DongguanGuangdongChina Present address:Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education)School of PhysicsBeijing Institute of Technology100081 BeijingChina

Understanding the microscopic mechanism of photoinduced sp^(2)-to-sp^(3) structural transformation in graphite is a scientific challenge with great ***,the ultrafast dynamics and characteristics of laser-induced structural transformation in graphite are revealed by non-adiabatic quantum dynamic *** laser irradiation,graphite undergoes an interlayer compression and sliding stage,followed by a key period of intralayer buckling and interlayer bonding to form an intermediate sp^(2)-sp^(3) hybrid structure,before completing the full transformation to hexagonal *** process is driven by the cooperation of charge carrier multiplication and selective phonon excitations through electron-phonon interactions,in which photoexcited hot electrons scattered into unoccupied high-energy conduction bands play a key role in the introduction of in-plane instability in *** work identifies a photoinduced non-adiabatic transition pathway from graphite to diamond and shows far-reaching implications for designing optically controlled structural phase transition in materials.

关键词： structural phonon interlayer

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Kissing-loop nano-kirigami structures with asymmetric transmission and anomalous reflection

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Light(advanced Manufacturing) 2024年第4期5卷 20-30页

作者： Yingying Chen Qinghua Liang Haozhe Sun Xiaochen Zhang Weikang Dong Meihua Niu Yanji Zheng Yanjie Chen Cuicui Lu Lingling Huang Xiaowei Li Lan Jiang Yang Wang Jiafang Li Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China BIT Chongqing Institute of Microelectronics and Microsystem Chongqing 400000China

Nano-kirigami technology enables the flexible transformation of two-dimensional(2D)micro/nanoscale structures into three-dimensional(3D)structures with either open-loop or close-loop topological morphologies,and has aroused significant interest in the fields of nanophotonics and ***,we propose an innovative kissing-loop nano-kirigami strategy,wherein 2D open-loop structures can transform into 3D kissing-loop structures while retaining advantages such as large deformation heights and multiple optical *** from the unidirectional deformation of the structures,the kissing-loop nano-kirigami exhibits significant asymmetric transmission under x-polarized light ***,the Pancharatnam-Berry geometric phase is experimentally realized in nano-kirigami structures for the first time,resulting in broadband anomalous reflection in the near-infrared wavelength *** kissing-loop nano-kirigami strategy can expand the existing platform of micro/nanoscale fabrication and provide an effective method for developing optical sensing,spatial light modulations,and optoelectronic devices.

关键词： Kissing-loop Nano-kirigami Asymmetric transmission Anomalous reflection

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Intrinsic and extrinsic anomalous transport properties in noncollinear antiferromagnetic Mn3Sn from first-principles calculations

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Physical Review B 2024年第21期109卷 214406-214406页

作者： Xiuxian Yang Wanxiang Feng Xiaodong Zhou Yuriy Mokrousov Yugui Yao Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems and School of Physics Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic Engineering Institute of Physics Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA 52425 Jülich Germany

Mn3Sn has garnered significant attention due to its kagome lattice, 120∘ noncollinear antiferromagnetic order, and substantial anomalous Hall effect. In this study, we comprehensively explore intrinsic and extrinsic contributions to anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects, employing first-principles calculations and group theory analysis. Comparative analysis between our theoretical results and available experimental data underscores the predominance of the intrinsic mechanism in shaping anomalous transport properties at low temperatures. Specifically, Weyl fermions are identified as the primary contributors to intrinsic anomalous Hall conductivity. The significance of extrinsic mechanisms becomes evident at high temperatures, especially when the longitudinal charge conductivity falls into the dirty regime, where the side jump mechanism plays a vital role. Extrinsic contributions to anomalous transport properties are primarily influenced by the electronic states residing at the Fermi surfaces. Furthermore, anomalous transport properties exhibit periodic variations when subjected to spin rotations within the kagome plane, achievable by applying an external magnetic field. Our findings advance the understanding of anomalous transport phenomena in Mn3Sn and offer insights into potential applications of noncollinear antiferromagnetic materials in spintronics and spin caloritronics.

关键词： Anomalous Hall effect Magnetism Transport phenomena First-principles calculations

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Predicted Pressure-Induced High-Energy-Density Iron Pentazolate Salts

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Chinese Physics Letters 2022年第8期39卷 47-52页

作者： Chuli Sun Wei Guo Yugui Yao Frontiers Science Center for High Energy Material(MOE) Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

Metal-pentazolate compounds as candidates for novel high-energy-density materials have attracted extensive attention in recent ***,dehydrated pentazolate salts of transition metal iron are rarely *** predict two new iron pentazolate salts Fdd2-FeN10 and P1(No.1)-FeN10 using a constrained crystal search method based on first-principles *** propose that the stable Fdd2-FeN_(10) crystal may be synthesized from FeN and N_(2) above 20 GPa,and its formation enthalpy is lower than the reported iron pentazolate salt(marked as P1(No.2)-FeN_(10)).Crystal P1(No.1)-FeN_(10) is composed of iron bispentazole *** enthalpy,phonon spectrum and ab initio molecular dynamics calculations are performed to show their thermodynamic,mechanical and dynamic ***,the high energy density(3.709 kJ/g,6.349 kJ/g)and good explosive performance indicate their potential applications as high-energy-density materials.

关键词： properties materials enthalpy

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Ultralow-Temperature Heat Transport Evidence for Residual Density of States in the Superconducting State of CsV_(3)Sb_(5 )

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Chinese Physics Letters 2024年第12期41卷 141-148页

作者： C.C.Zhao L.S.Wang W.Xia Q.W.Yin H.B.Deng G.W.Liu J.J.Liu X.Zhang J.M.Ni Y.Y.Huang C.P.Tu Z.C.Tao Z.J.Tu C.S.Gong Z.W.Wang H.C.Lei Y.F.Guo X.F.Yang J.X.Yin S.Y.Li State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200438China Shanghai Research Center for Quantum Sciences Shanghai 201315China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics Shanghai 201210China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Center for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Shanghai Branch Hefei National LaboratoryShanghai 201315China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

V-based kagome superconductors AV_(3)Sb_(5)(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of superconductivity(SC),CDW,frustration,and ***,we report ultralow-temperature thermal conductivity measurements of CsV_(3)Sb_(5 ) and Ta-doped Cs((V_(0.86)Ta_(0.14)))_(3)Sb_(5) and scanning tunneling microscopy(STM)measurements of CsV_(3)Sb_(5 ).The finite residual linear term of thermal conductivity at zero magnetic field suggests the existence of a residual density of states(DOS)in the superconducting state of CsV_(3)Sb_(5 ).This is supported by the observation of non-zero conductance at zero bias in STM spectrum at an electronic temperature of 90 ***,in Cs(V_(0.86)Ta_(0.14))_(3)Sb_(5),which does not have CDW order,there is no evidence for the residual *** results show the importance of CDW order for the residual DOS,and that a nodal s-wave gap or residual Fermi arc may be the origin of the residual DOS in such an unusual multiband kagome superconductor,CsV_(3)Sb_(5 ).

关键词： thereby conductivity

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Two-Dimensional Fully Compensated Ferrimagnetism

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Physical Review Letters 2025年第11期134卷 116703-116703页

作者： Yichen Liu San-Dong Guo Yongpan Li Cheng-Cheng Liu Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China School of Electronic Engineering Xi’an University of Posts and Telecommunications Xi’an 710121 China

Antiferromagnetic spintronics has long been a subject of intense research interest, and the recent introduction of altermagnetism has further ignited enthusiasm in the field. However, fully compensated ferrimagnetism, which exhibits band spin splitting but zero net magnetization, has yet to receive enough attention. Since the experimental preparation of two-dimensional (2D) magnetic van der Waals (vdW) materials in 2017, 2D magnetic materials, thanks to their super tunability, have quickly become an important playground for spintronics. Here, we extend the concept of fully compensated ferrimagnetism (fFIM) to two dimensions and propose 2D filling-enforced fFIM, demonstrate its stability and ease of manipulation, and present three feasible realization schemes with respective exemplary candidate materials. A simple model for 2D fully compensated ferrimagnets (fFIMs) is developed. Further investigation of 2D fFIMs’ physical properties reveals that they not only exhibit significant magneto-optical response but also show fully spin-polarized currents and the anomalous Hall effect in the half-metallic states, displaying characteristics previously almost exclusive to ferromagnetic materials, greatly broadening the research and application prospects of spintronic materials.

关键词： Ferrimagnetism

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Technologies and applications of silicon-based micro-optical electromechanical systems:A brief review

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Journal of Semiconductors 2022年第8期43卷 24-32页

作者： Shanshan Chen Yongyue Zhang Xiaorong Hong Jiafang Li Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China

Micro-optical electromechanical systems(MOEMS)combine the merits of micro-electromechanical systems(MEMS)and micro-optics to enable unique optical functions for a wide range of advanced *** simple external electromechanical control methods,such as electrostatic,magnetic or thermal effects,Si-based MOEMS can achieve precise dynamic optical *** this paper,we will briefly review the technologies and applications of Si-based *** basic working principles,advantages,general materials and micromachining fabrication technologies are introduced concisely,followed by research progress of advanced Si-based MOEMS devices,including micromirrors/micromirror arrays,micro-spectrometers,and optical/photonic *** to the unique advantages of Si-based MOEMS in spatial light modulation and high-speed signal processing,they have several promising applications in optical communications,digital light processing,and optical ***,future research and development prospects of Si-based MOEMS are discussed.

关键词： MOEMS Si-based micromachining technology micromirror micro-spectrometer optical switches

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Planar Hall effect in topological Weyl and nodal-line semimetals

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Physical Review B 2023年第8期108卷 085120-085120页

作者： Lei Li Jin Cao Chaoxi Cui Zhi-Ming Yu Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China

Using symmetry analysis and a semiclassical Boltzmann equation, we theoretically explore the planar Hall effect (PHE) in three-dimensional materials. We demonstrate that PHE is a general phenomenon that can occur in various systems regardless of band topology. Both the Lorentz force and Berry curvature effects can induce significant PHE, and the leading contributions of both effects linearly depend on the electric and magnetic fields. The Lorentz force and Berry curvature PHE coefficient possess only antisymmetric and symmetric parts, respectively. Both contributions respect the same crystalline symmetry constraints but differ under time-reversal symmetry. Remarkably, for topological Weyl semimetals, the Berry curvature PHE coefficient is a constant that does not depend on the Fermi energy, while the Lorentz force contribution linearly increases with the Fermi energy, resulting from the linear dispersion of the Weyl point. Furthermore, we find that the PHE in topological nodal line semimetals is mainly induced by the Lorentz force, as the Berry curvature in these systems vanishes near the nodal line. Our study not only highlights the significance of the Lorentz force in PHE, but also reveals its unique characteristics, which will be beneficial for determining the Lorentz force contribution experimentally.

关键词： Electrical conductivity Hall effect Topological materials

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High-temperature Majorana corner modes in a d+id′ superconductor heterostructure: Application to twisted bilayer cuprate superconductors

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Physical Review B 2023年第23期107卷 235125-235125页

作者： Yu-Xuan Li Cheng-Cheng Liu Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China

The realization of Majorana corner modes generally requires unconventional superconducting pairing or s-wave pairing. However, the bulk nodes in unconventional superconductors and the low Tc of s-wave superconductors are not conducive to the experimental observation of Majorana corner modes. Here, we show the emergence of a Majorana corner mode at each corner of a two-dimensional topological insulator in proximity to a d+id′ pairing superconductor, such as heavily doped graphene or especially a twisted bilayer of a cuprate superconductor, e.g., Bi2Sr2CaCu2O8+δ, which has recently been proposed as a fully gapped chiral dx2−y2+idxy superconductor with Tc close to its native 90 K, and an in-plane magnetic field. By numerical calculation and intuitive edge theory, we find that the interplay of the proximity-induced pairing and Zeeman field can introduce opposite Dirac masses on adjacent edges of the topological insulator, which creates one zero-energy Majorana mode at each corner. Our scheme offers a feasible route to achieve and explore Majorana corner modes in a high-temperature platform without bulk superconductor nodes.

关键词： Majorana bound states Majorana fermions Cuprates High-temperature superconductors Topological materials

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Electronegativity-Induced Single-Ion Conducting Polymer Electrolyte for Solid-State Lithium Batteries

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Energy & Environmental Materials 2023年第4期6卷 40-48页

作者： Tianyi Hou Yumin Qian Dinggen Li Bo Xu Zhenyu Huang Xueting Liu Haonan Wang Bowen Jiang Henghui Xu Yunhui Huang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of EducationSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Jiangsu Jitri-Hust Intelligent Equipment Technology Nanjing 210000China

The application of solid polymer electrolytes(SPEs)is severely impeded by the insufficient ionic conductivity and low Li^(+)transference numbers(t_(Li)^(+)).Here,we report an iodine-driven strategy to address both the two longstanding issues of SPEs *** lodine-containing groups introduced on polymer chains effectively attract Li^(+)ions,facilitate Li^(+)transport,and promote the dissociation of Li ***,iodine is also favorable to alleviate the strong O-Li^(+)coordination through a Lewis acidbase interaction,further improving the ionic conductivity and t_(Li)^(+).As a proof of concept,an iodinated single-ion conducting polymer electrolyte(IPE)demonstrates a high ionic conductivity of 0.93 mS cm^(-1)and a high t_(Li)^(+)of 0.86 at 25℃,which is among the best results ever reported for ***,symmetric Li/Li cells with IPE achieve a long-term stability over 2600 h through the in-situ formed LiF-rich *** a result,Li-S battery with IPE maintains a high capacity of 623.7 mAh g^(-1)over 300 cycles with an average Coulombic efficiency of 99%.When matched with intercalation cathode chemistries,Li/IPE/LiFePO_(4)and Li/IPE/LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)solid-state batteries also deliver high-capacity retentions of 95%and 97%at 0.2 C after 120 cycles,respectively.

关键词： iodine lithium polymer electrolytes single-ion conducting solid-state batteries

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