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Physical Review Letters 2024年第7期133卷 076502-076502页

作者： Tsuneya Yoshida Song-Bo Zhang Titus Neupert Norio Kawakami Department of Physics Institute for Theoretical Physics Hefei National Laboratory Hefei Anhui 230088 China International Center for Quantum Design of Functional Materials (ICQD) Department of Materials Engineering Science Fundamental Quantum Science Program TRIP Headquarters

We propose a novel type of skin effects in non-Hermitian quantum many-body systems that we dub a “non-Hermitian Mott skin effect.” This phenomenon is induced by the interplay between strong correlations and the non-Hermitian point-gap topology. The Mott skin effect induces extreme sensitivity to the boundary conditions only in the spin degree of freedom (i.e., the charge distribution is not sensitive to boundary conditions), which is in sharp contrast to the ordinary non-Hermitian skin effect in noninteracting systems. Concretely, we elucidate that a bosonic non-Hermitian chain exhibits the Mott skin effect in the strongly correlated regime by closely examining an effective Hamiltonian. The emergence of the Mott skin effect is also supported by numerical diagonalization of the bosonic chain. The difference between the ordinary non-Hermitian skin effect and the Mott skin effect is also reflected in the time evolution of physical quantities; under the time evolution spin accumulation is observed while the charge distribution remains spatially uniform.

关键词： Bosons Strong interaction Topological insulators

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Cooperative catalytic platinum species accelerating polysulfide redox reactions for Li-S batteries

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Journal of Energy Chemistry 2023年第12期87卷 123-135,I0005页

作者： Yujie Qi Ning Chai Qinhua Gu Junnan Chen Zhaofeng Zhai Ming Lu Yiming Niu Nan Huang Xia Zhang Bingsen Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina Department of Chemistry College of ScienceNortheastern UniversityShenyang 110819LiaoningChina The Joint Laboratory of MXene Materials Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of EducationKey Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of EducationJilin Normal UniversityChangchun 130103JilinChina

The shuttle effect derived from diffusion of lithium polysulfides(LiPSs) and sluggish redox kinetic bring about poor cycling stability and low utilization of sulfur,which have always been the key challenging issues for the commercial application of lithium-sulfur(Li-S) *** design of cathode materials to catalyze Li_(2)S dissociation/nucleation processes is an appealing and valid strategy to develop high-energy practical Li-S ***,considering the synergistic effect of bidirectional catalysis on LiPSs conversion and enhanced chemical immobilization for LiPSs by heteroatom doping,Pt nanoparticles loaded on nitrogen-doped carbon spheres(Pt/NCS composites) were constructed as cathode *** to the dynamic evolution of Pt catalysts and sulfur species,Pt~0 and Pt^(2+) species were identified as active species for the accelerated dissociation and nucleation of Li_(2)S,***,in-situ Raman results demonstrated the expedited conversion of sulfur species resulted from bidirectional catalysis of active Pt species,corresponding to boosted redox ***,Pt/NCS cathode exhibited improved long-term cyclability with high initial capacity,along with enhanced rate *** work provides a facile approach to construct cathode materials with bidirectional catalysis on Li_(2)S dissociation/nucleation,and sheds light on a more global understanding of the catalytic mechanism of metal catalysts during LiPSs conversion.

关键词： Lithium-sulfur batteries Platinum species N-doped carbon spheres Bidirectional catalysis Polysulfide conversion

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Topological phases of the interacting Su-Schrieffer-Heeger model: An analytical study

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Physical Review B 2024年第16期110卷 165145页

作者： E. Di Salvo A. Moustaj C. Xu L. Fritz A. K. Mitchell C. Morais Smith D. Schuricht Institute for Theoretical Physics Department of Physics and Materials Science Institute of Theoretical Physics School of Physics Centre for Quantum Engineering Science and Technology

The interacting SSH model provides an ideal ground to study the interplay between topologically insulating phases and electron-electron interactions. We study the polarization density as a topological invariant and provide an analytic treatment of its behavior in the low-energy sector of the one-dimensional interacting SSH model. By formulating the topological invariant in terms of Green's functions, we use the low-energy field theory of the Thirring model to derive the behavior of the polarization density. We show that polarization density in the continuum theory describes the usual topological insulating phases. Still, it contains an extra factor from the fields' scaling dimensions in the low-energy quantum field theory. We interpret this as a measure of the modified charge of the new excitations in the system. We find two distinct contributions: a renormalization of the electronic charge e of a Fermi liquid because of quasiparticle smearing and an additional contribution coming from the topological charge of the soliton arising in the bosonized version of the Thirring model, the sine-Gordon model.

关键词： Edge states Electric polarization Exotic phases of matter Fermions Geometric & topological phases Phase diagrams Symmetry protected topological states Topological insulators Topological phase transition Topological phases of matter Su-Schrieffer-Heeger model

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Highly efficient and stable organic solar cells with SnO_(2)electron transport layer enabled by UV-curing acrylate oligomers

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Journal of Energy Chemistry 2024年第5期92卷 124-131页

作者： Mwende Mbilo Du Hyeon Ryu Seungjin Lee Muhammad Haris Julius Mwakondo Mwabora Robinson Juma Musembi Hang Ken Lee Sang Kyu Lee Chang Eun Song Won Suk Shin Department of Physics Faculty of Science and TechnologyUniversity of Nairobi(UoN)P.O.Box 30197-00100NairobiKenya Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea Advanced Materials and Chemical Engineering University of Science and Technology(UST)Daejeon 34113Republic of Korea

The interfaces between the inorganic metal oxide and organic photoactive layer are of outmost importance for efficiency and stability in organic solar cells(OSCs).Tin oxide(SnO_(2))is one of the promising candidates for the electron transport layer(ETL)in high-performance inverted *** a solution-processed SnO_(2)ETL is employed,however,the presence of interfacial defects and suboptimal interfacial contact can lower the power conversion efficiency(PCE)and operational stability of ***,highly efficient and stable inverted OSCs by modification of the SnO_(2)surface with ultraviolet(UV)-curable acrylate oligomers(SAR and OCS)are *** highest PCEs of 16.6%and 17.0%are achieved in PM6:Y6-BO OSCs with the SAR and OCS,respectively,outperforming a device with a bare SnO_(2)ETL(PCE 13.8%).The remarkable enhancement of PCEs is attributed to the optimized interfacial contact,leading to mitigated surface *** strikingly,improved light-soaking and thermal stability strongly correlated with the interfacial defects are demonstrated for OSCs based on SnO_(2)/UV cross-linked resins compared to OSCs utilizing bare SnO_(2).We believe that UV cross-linking oligomers will play a key role as interfacial modifiers in the future fabrication of large-area and flexible OSCs with high efficiency and stability.

关键词： Organic solar cells SnO_(2) Surface defects Ultraviolet resins Stability Cross-linking oligomers Non-halogenated solvent

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Hybrid of bulk NbC and layered Nb_(4)C_(3)MXene for tailoring the hydrogen storage kinetics and reversibility of Li-Mg-B-H composite:An experimental and theoretical study

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Journal of materials science & Technology 2024年第27期194卷 225-235页

作者： Haizhen Liu Liwen Lu Hui Luo Jiayi Deng Guangxu Li Hua Ning Yi Fan Cunke Huang Zhiqiang Lan Wenzheng Zhou Jin Guo Xinhua Wang Guangxi Novel Battery Materials Research Center of Engineering Technology Key Laboratory of Blue Energy and Systems Integration(Guangxi University)Education Department of Guangxi Zhuang Autonomous RegionSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China College of Mathematics and Physics Guangxi Minzu UniversityNanning 530006China Nanning Engineering Technology Research Center for Power Transmission System of New Energy Vehicle Transportation CollegeNanning UniversityNanning 530200China Department of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

The Li-Mg-B-H composite(2LiBH_(4)+MgH_(2))is acknowledged as a promising material for hydrogen storage due to its large hydrogen capacity(11.4 wt.%).However,the sluggish kinetics and poor reversibility make it difficult to be practically *** this work,the hydrogen storage performances of 2LiBH_(4)+MgH_(2)have been significantly improved by a hybrid of bulk NbC and layered Nb_(4)C_(3)MXene(denoted as“Nb-C”).The 2LiBH_(4)+MgH_(2)+6 wt.%Nb-C can release 8.5 wt.%H_(2)within 30 min at 400℃and the dehy-drogenated composite can absorb 9.3 wt.%H_(2)within 30 min at 350℃and 7.5 MPa H_(2).The reversible dehydrogenation capacity maintains at 8.4 wt.%after 24 cycles,with a capacity retention ratio of 95.4%.By contrast,the undoped 2LiBH_(4)+MgH_(2)suffers from serious capacity degradation,with the capacity decreased dramatically to 3.5 wt.%after 3 *** studies revealed that the doped com-posite has uniform particle and elemental distributions and possesses various multiphase interfaces of LiH/MgB_(2)/NbC/Nb_(4)C_(3),which is beneficial to hydrogen diffusion during the hydrogen uptake and release *** studies by first principle calculation presented an extended bond length of the Mg-H and B-H bonds in the 2LiBH_(4)+MgH_(2)+NbC system,which may also explain the improved hydrogen storage properties of 2LiBH_(4)+MgH_(2)by addition of *** work provides new insights into the role of transition metal carbides in regulating the Li-Mg-B-H hydrogen storage materials both experimentally and theoretically.

关键词： Hydrogen storage Lithium borohydride Magnesium hydride MXene NbC Nb_(4)C_(3)

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Monothetic and conductive network and mechanical stress releasing layer on micron-silicon anode enabling high-energy solid-state battery

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Rare Metals 2024年第3期43卷 1017-1029页

作者： Xiang Han Min Xu Lan-Hui Gu Chao-Fei Lan Min-Feng Chen Jun-Jie Lu Bi-Fu Sheng Peng Wang Song-Yan Chen Ji-Zhang Chen College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forestry ResourcesNanjing Forestry UniversityNanjing210037China Department of Physics Xiamen UniversityXiamen361005China Western Digital Corporation MilpitasCA95035USA

Silicon has ultrahigh capacity,dendrite-free alloy lithiation mechanism and low cost and has been regarded as a promising anode candidate for solid-state *** to the low infiltration of solid-state electrolyte(SSE),not the unstable solid-electrolyte interphase(SEI),but the huge stress during lithiation-and delithiation-induced particle fracture and conductivity lost tend to be the main *** this study,starting with micron-Si,a novel monothetic carbon conductive framework and a MgO coating layer are designed,which serve as electron pathway across the whole electrode and stress releasing layer,*** addition,the in situ reaction between Si and SSE helps to form a LiF-rich and mechanically stable SEI *** a result,the mechanical stability and charge transfer kinetics of the uniquely designed Si anode are significantly ***,high initial Coulombic efficiency,high capacity and durable cycling stability can be achieved by applying the Si@MgO@C anode in *** example,high specific capacity of 3224.6 mAh·g^(-1)and long cycling durability of 200 cycles are *** work provides a new concept for designing alloy-type anode that combines surface coating on particle and electrode structure design.

关键词： Lithium-ion battery(LIB) Solid-state electrolyte(SSE) Silicon anode Stress relief Coating

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Highly spectra-stable pure blue perovskite light-emitting diodes based on copper and potassium co-doped quantum dots

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Nano Research 2023年第5期16卷 7654-7660页

作者： Fang Chen Wenjie Ming Yongfei Li Yun Gao Lea Pasquale Kexin Yao Boyuan Huang Qiuting Cai Guochao Lu Jizhong Song Mirko Prato Xingliang Dai Haiping He Zhizhen Ye School of Materials Science and Engineering State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of WenzhouZhejiang UniversityWenzhou 325006China Wenzhou XINXINTAIJING Tech.Co.Ltd. Wenzhou 325006China Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Multi-scale Porous Materials Center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China Materials Characterization Facility Istituto Italiano di TecnologiaGenova 16163Italy School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450052China

Halide perovskite light emitting diodes(LEDs)have gained great progress in recent ***,mixed-halide perovskites for blue LEDs usually suffer from electroluminescence(EL)spectra shift at a high applied voltage or current density,limiting their *** this work,we report a strategy of using single-layer perovskite quantum dots(QDs)film to tackle the electroluminescence spectra shift in pure-blue perovskite LEDs and improve the LED efficiency by co-doping copper and potassium in the mixed-halide perovskite *** a result,we obtained pure-blue halide perovskite QD-LEDs with stable EL spectra centred at 469 nm even at a current density of 1,617 mA·cm^(−2).The optimal device presents a maximum external quantum efficiency(EQE)of 2.0%.The average maximum EQE and luminance of the LEDs are 1.49%and 393 cd·m^(−2),increasing 62%and 66%compared with the control *** study provides an effective strategy for achieving spectra-stable and highly efficient pure-blue perovskite LEDs.

关键词： light-emitting diode blue LED perovskite quantum dot stable electroluminescence spectra metal doping

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Insights into the Origins of Solar-Assisted Electrochemical Water Oxidation in Allotropic Co_(5.47)N/CON Heterojunctions

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Energy & Environmental materials 2024年第5期7卷 234-243页

作者： Sirui Liu Qiong Gao Bo Geng Lili Wu Zhikun Xu Xinzhi Ma Shijie Liu Boquan Li Mingyi Zhang Lirong Zhang Xitian Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China School of Physics and Engineering Henan University of Science and Technology Luoyang 471023China School of Science Guangdong University of Petrochemical TechnologyMaoming 525000China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China College of Science Southern University of Science and TechnologyShenzhen 518055China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Solar irradiation can efficiently promote the kinetics of the oxygen evolution reaction(OER)during water splitting,where heterojunction catalysts exhibit excellent photoresponsive ***,insights into the origins of photoassisted OER catalysis remain unclear,especially the interfaced promotion under convergent solar irradiation(CSI).Herein,novel allotropic Co_(5.47)N/CoN heterojunctions were synthesized,and corresponding OER mechanisms under CSI were comprehensively uncovered from physical and chemical aspects using the in situ Raman technique and electrochemical cyclic voltammetry *** results provide a unique mechanism where high-energy UV light promotes the Co^(3+/4+)conversion process in addition to the ordinary photoelectric effect excitation of the Co^(2+)***,visible light under CSI can produce a photothermal effect for Co^(2+)excitation and Co^(3+/4+)conversion,which promotes the OER significantly more than the usual photoelectric *** a result,Co_(5.47)N/CoN(containing 28%CoN)obtained 317.9%OER enhancement,which provides a pathway for constructing excellent OER catalysts.

关键词： chemical origins in situ Raman OER photothermal effect physical origins

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Topological Hall effect induced by chiral fluctuations in ErMn6Sn6

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Physical Review materials 2024年第9期8卷 094411页

作者： Kyle Fruhling Alenna Streeter Sougata Mardanya Xiaoping Wang Priya Baral Oksana Zaharko Igor I. Mazin Sugata Chowdhury William D. Ratcliff Fazel Tafti Department of Physics Department of Physics and Astrophysics Neutron Scattering Division Laboratory for Neutron Scattering and Imaging (LNS) Department of Physics and Astronomy and Quantum Science and Engineering Center Department of Physics and Department of Materials Science and Engineering

Topological Hall effect (THE) is a hallmark of scalar spin chirality, which is found in static skyrmion lattices. Recent theoretical works have shown that scalar spin chirality could also emerge dynamically from thermal spin fluctuations. Evidence of such a mechanism was found in the kagome magnet YMn6Sn6 where fluctuations arise from frustrated exchange interactions between Mn kagome layers. In YMn6Sn6, the rare-earth ion Y3+ is nonmagnetic. When it is replaced by a magnetic ion (Gd3+−Ho3+), the intrinsically antiferromagnetic Mn-Mn interlayer coupling is overwhelmed by the indirect ferromagnetic Mn−R−Mn one, relieving frustration. This generates interesting anomalous Hall conductivity, but not THE. Here we show that Er lies in an intermediate regime where direct and indirect interactions closely compete, so that ErMn6Sn6 can switch from one regime to the other by temperature, i.e., from a collinear ferrimagnetic ground state to a spiral antiferromagnet at 78 K. The antiferromagenetic phase forms a dome in the temperature-field phase diagram. Close to the boundary of this dome, we find a sizable fluctuations-driven THE, thus underscoring the universality of this chiral fluctuation mechanism for generating nonzero scalar spin chirality.

关键词： Magnetic phase transitions Topological Hall effect Crystal growth DFT+U Magnetization measurements Neutron diffraction Resistivity measurements

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Two-Layer High-Throughput:Effective Mass Calculations Including Warping

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engineering 2022年第3期8卷 74-80页

作者： Andrew Supka Nicholas A.Mecholsky Marco Buongiorno Nardelli Stefano Curtarolo Marco Fornari Department of Physics&Science of Advanced Materials Program Central Michigan UniversityMount PleasantMI 48859USA Department of Physics&Vitreous State Laboratory The Catholic University of AmericaWashingtonDC 20064USA Department of Physics&Department of Chemistry University of North TexasDentonTX 76203USA Center for Autonomous Materials Design Duke UniversityDurhamNC 27708USA Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA

In this paper,we perform two-layer high-throughput *** the first layer,which involves changing the crystal structure and/or chemical composition,we analyze selected Ⅲ-Ⅴ semiconductors,filled and unfilled skutterudites,as well as rock salt and layered *** second layer searches the full Brillouin zone(BZ)for critical points within 1.5 eV(1 eV=1.602176×10^(-19)J)of the Fermi level and characterizes those points by computing the effective *** introduce several methods to compute the effective masses from first principles and compare them to each *** approach also includes the calculation of the density-of-states effective masses for warped critical points,where traditional approaches fail to give consistent results due to an underlying non-analytic behavior of the critical *** demonstrate the need to consider the band structure in its full complexity and the value of complementary approaches to compute the effective *** also provide computational evidence that warping occurs only in the presence of degeneracies.

关键词： High-throughput Electronic structure Band warping Effective mass

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