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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Gollner, Claudia Jutas, Rokas Kreil, Dominik Dirin, Dmitry N. Boehme, Simon C. Baltuška, Andrius Kovalenko, Maksym V. Koulouklidis, Anastasios D. Fedorov, Vladimir Yu. Tzortzakis, Stelios Shalaby, Mostafa Pugžlys, Audrius Stanford Institute for Materials & Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Rd Menlo ParkCA94025 United States Photonics Institute TU Wien Gusshausstrasse 27-387 WienA-1040 Austria Institute for Theoretical Physics Johannes Kepler University Altenbergerstraße 69 LinzA-4040 Austria Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Zürich 10 Vladimir Prelog Weg 1 ZürichCH-8093 Switzerland Empa-Swiss Federal Laboratories for Materials Science and Technology DübendorfCH-8600 Switzerland Center for Physical Sciences & Technology Savanoriu Ave. 231 VilniusLT-02300 Lithuania P.O. Box 1527 HeraklionGR-71110 Greece Science Program Texas A&M University at Qatar P.O. Box 23874 Doha Qatar P.N. Lebedev Physical Institute The Russian Academy of Sciences 53 Leninskiy Prospekt Moscow119991 Russia Department of Materials Science and Technology University of Crete HeraklionGR-71003 Greece Swiss Terahertz Research-Zurich Techpark Zurich8005 Switzerland Park Innovaare VilligenCH-5234 Switzerland Key Laboratory of Terahertz Optoelectronics Beijing Advnaced Innovation Center of Imaging Technology CNU Bejing100048 China

We report on strong-field THz sources from optical rectification in organic crystals or two-color plasma filaments, driven by intense mid-IR pulses. Non-linear perturbation of semiconductor materials is demonstrated b... 详细信息

ISBN: (纸本)9781957171395

关键词： Semiconductor lasers

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Systematic designs of single metal compounds synthesized using ammonia fluoride-based complex as structure directing agents for energy storage

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Journal of Colloid and Interface science 2023年第PartA期652卷 294-304页

作者： Kuo, Tsung-Rong Zher Yu, You Wu, Chung-Hsien Lee, Pin-Yan Kongvarhodom, Chutima Chen, Hung-Ming Husain, Sadang Yougbaré, Sibidou Lin, Lu-Yin International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei Taiwan Department of Chemical Engineering King Mongkut's University of Technology Thonburi 126 Pracha-u-thit Toong-kru Bangkok10140 Thailand Gingen technology Co. LTD. Rm. 7 10F. No.189 Sec. 2 Keelung Rd. Xinyi Dist. Taipei11054 Taiwan Department of Physics Faculty of Mathematics and Natural Science Lambung Mangkurat University Banjarmasin70124 Indonesia /Nanoro 03 B.P 7192 Ouagadougou 03 Burkina Faso

Tailoring morphology and composition of metal organic frameworks (MOF) can improve energy storage by establishing high surface area, large porosity and multiple redox states. Structure directing agents (SDA) is functional of designing surface properties of electroactive materials. Ammonium fluoride has functional abilities for designing MOF derivatives with excellent energy storage abilities. Systematic design of MOF derivatives using ammonia fluoride-based complex as SDA can essentially create efficient electroactive materials. Metal species can also play significant roles on redox reactions, which are the main energy storage mechanism for battery-type electrodes. In this work, 2-methylimidazole, two novel SDAs of NH4BF4 and NH4HF2, and six metal species of Al, Mn, Co, Ni, Cu and Zn are coupled to synthesize MOF derivatives for energy storage. Metal species-dependent compositions including hydroxides, oxides, and hydroxide nitrates are observed. The nickel-based derivative (Ni-HBF) shows the highest specific capacitance (CF) of 698.0F/g at 20 mV/s, due to multiple redox states and advanced flower-like surface properties. The diffusion and capacitive-control contributions of MOF derivatives are also analyzed. The battery supercapacitor hybrid with Ni-HBF electrode shows a maximum energy density of 27.9 Wh/kg at 325 W/kg. The CF retention of 170.9% and Coulombic efficiency of 93.2% are achieved after 10,000 cycles. © 2023 Elsevier Inc.

关键词： Supercapacitor

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Light-induced Weyl semiconductor-to-metal transition mediated by Peierls instability

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physical Review B 2022年第20期106卷 205118-205118页

作者： Honglie Ning Omar Mehio Chao Lian Xinwei Li Eli Zoghlin Preston Zhou Bryan Cheng Stephen D. Wilson Bryan M. Wong David Hsieh Institute for Quantum Information and Matter California Institute of Technology Pasadena California 91125 USA Department of Physics California Institute of Technology Pasadena California 91125 USA Department of Chemical and Environmental Engineering Materials Science and Engineering Program and Department of Physics and Astronomy University of California Riverside California 92521 USA Materials Department University of California Santa Barbara California 93106 USA

Elemental tellurium is a strongly spin-orbit coupled Peierls-distorted semiconductor whose band structure features topologically protected Weyl nodes. Using time-dependent density functional theory calculations, we show that impulsive optical excitation can be used to transiently control the amplitude of the Peierls distortion, realizing a mechanism to switch tellurium between three states: Weyl semiconductor, Weyl metal, and non-Weyl metal. Further, we present experimental evidence of this inverse Peierls distortion using time-resolved optical second harmonic generation measurements. These results provide a pathway to multifunctional ultrafast Weyl devices and introduce Peierls systems as viable hosts of light-induced topological transitions.

关键词： Electron-phonon coupling Optical phonons Peierls transition Topological materials Topological phase transition Topological phases of matter Density functional theory Optical second-harmonic generation Time-resolved infrared spectroscopy

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Serendipitous Synthesis and Ultrahigh Capacitance of Protonated C3N5 Nanosheets in Symmetric Super capacitors

SSRN

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SSRN 2024年

作者： Pitchaimuthu, Sudhagar Subbiah, Mahalakshmi Muthusamy, Kasiviswanathan Sundaramurthy, Anandhakumar Venkatachalam, Sabarinathan Saravanan, Nishakavya Srinivasan, Nagarajan Department of Renewable Energy Science Manonmaniam Sundaranar University Tirunelveli India Laboratory of Electrochemical Interfaces Department of Chemistry Manonmaniam Sundaranar University Tirunelveli India Biomaterials Research Laboratory Department of Chemical Engineering SRM Institute of Science and Technology Tamil Nadu Kattankulathur603203 India Department of Physics Manonmaniam Sundaranar University Tirunelveli India Department of Physics and Nanotechnology SRM Institute of Science and Technology Tamil Nadu Kattankulathur603203 India Research Centre for Carbon Solutions Institute of Mechanical Processing and Energy Engineering School of Engineering and Physical Sciences Heriot-Watt University United Kingdom

Carbon nitride has recently transpired as the inevitable two-dimensional polymeric layered material tailoring in various fields due to its chemical stability and tunable band gap. Herein, the facile & scalable synthesis through the thermal polymerization of 3-amino-1, 2, 4-triazole precursor serendipitously forms another stable allotrope C3N5. An ultrathin C3N5 nanosheet was fortuitously achieved through the protonation process. Because of its electron-rich character & delamination of the stacked interlayer, the hydrochloric acid-treated C3N5 is endowed with ultra-high capacitance and impressive cyclic stability outperforming the other carbon & metal oxide-based material. As a result, it attains a high specific capacitance of 875 F/g, which is eight-fold higher than the pristine C3N5 and other acids-treated C3N5. It also displayed excellent cyclic stability of 100% over 10,000 cycles. Furthermore, the fabricated symmetric device demonstrated remarkable power and energy densities of 72 W/kg and 19 Wh/kg, respectively, with excellent cyclic stability of 90% over 5000 cycles. The rate capability & improved capacitance of hydrochloric acid-treated C3N5 are due to the effective construction of charged ions from the synergistically interplayed effect of segregated stacked interlayers with their strong inplanar hepatazine unit of electron-rich nitrogen moieties. Furthermore, ex situ Raman and SEM analyses were performed, emphasizing the strong structural packaging of the CN heterocyclic unit even after cycling mechanism. This will be an archetype for future sustainable development with commendable electrochemical properties as a resurgence to meet global energy demand. © 2024, The Authors. All rights reserved.

关键词： Carbon nitride

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Stable Solid Molecular Hydrogen above 900 K from a Machine-Learned Potential Trained with Diffusion Quantum Monte Carlo

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physical Review Letters 2023年第7期130卷 076102-076102页

作者： Hongwei Niu (牛宏伟) Yubo Yang (杨煜波) Scott Jensen Markus Holzmann Carlo Pierleoni David M. Ceperley Department of Astronautical Science and Mechanics Harbin Institute of Technology Harbin Heilongjiang 150001 China Center for Computational Quantum Physics Flatiron Institute New York New York 10010 USA Department of Physics University of Illinois Urbana Illinois 61801 USA Univ. Grenoble Alpes CNRS LPMMC 38000 Grenoble France Department of Physical and Chemical Sciences University of L’Aquila Via Vetoio 10 I-67010 L’Aquila Italy

We survey the phase diagram of high-pressure molecular hydrogen with path integral molecular dynamics using a machine-learned interatomic potential trained with quantum Monte Carlo forces and energies. Besides the HCP and C2/c−24 phases, we find two new stable phases both with molecular centers in the Fmmm−4 structure, separated by a molecular orientation transition with temperature. The high temperature isotropic Fmmm−4 phase has a reentrant melting line with a maximum at higher temperature (1450 K at 150 GPa) than previously estimated and crosses the liquid-liquid transition line around 1200 K and 200 GPa.

关键词： Compressed hydrogen Electronic structure Equations of state First-principles calculations Phase diagrams Phase transitions Artificial neural networks Deep learning Diffusion quantum Monte Carlo Machine learning Molecular dynamics Path-integral Monte Carlo Path-integral methods Quantum Monte Carlo

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Magnetism in AV3Sb5 (A=Cs, Rb, and K): Origin and Consequences for the Strongly Correlated Phases

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physical Review Letters 2023年第19期131卷 196702-196702页

作者： Md. Nur Hasan Ritadip Bharati Johan Hellsvik Anna Delin Samir Kumar Pal Anders Bergman Shivalika Sharma Igor Di Marco Manuel Pereiro Patrik Thunström Peter M. Oppeneer Olle Eriksson Debjani Karmakar Department of Chemical and Biological Sciences S. N. Bose National Centre for Basic Sciences Block JD Sector-III SaltLake Kolkata 700 106 India School of Physical Sciences National Institute of Science Education and Research HBNI Jatni—752050 Odisha India PDC Center for High Performance Computing KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Department of Applied Physics KTH Royal Institute of Technology SE-106 91 Stockholm Sweden Swedish e-Science Research Center (SeRC) KTH Royal Institute of Technology SE-10044 Stockholm Sweden Department of Physics and Astronomy Uppsala University Box 516 SE-751 20 Uppsala Sweden Asia Pacific Center for Theoretical Physics Pohang 37673 Republic of Korea Department of Physics Pohang University of Science and Technology Pohang 37673 Republic of Korea Technical Physics Division Bhabha Atomic Research Centre Mumbai 400085 India

The V-based kagome systems AV3Sb5 (A=Cs, Rb, and K) are unique by virtue of the intricate interplay of nontrivial electronic structure, topology, and intriguing fermiology, rendering them to be a playground of many mutually dependent exotic phases like charge-order and superconductivity. Despite numerous recent studies, the interconnection of magnetism and other complex collective phenomena in these systems has yet not arrived at any conclusion. Using first-principles tools, we demonstrate that their electronic structures, complex fermiologies and phonon dispersions are strongly influenced by the interplay of dynamic electron correlations, nontrivial spin-polarization and spin-orbit coupling. An investigation of the first-principles-derived intersite magnetic exchanges with the complementary analysis of q dependence of the electronic response functions and the electron-phonon coupling indicate that the system conforms as a frustrated spin cluster, where the occurrence of the charge-order phase is intimately related to the mechanism of electron-phonon coupling, rather than the Fermi-surface nesting.

关键词： Charge density waves Electronic structure Fermi surface Magnetic interactions Phonons Spin-orbit coupling Superconductivity

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Fabrication of PTFE/Nomex fabric/phenolic composites using a layer-by-layer self-assembly method for tribology field application

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Friction 2020年第2期8卷 335-342页

作者： Mingming YANG Zhaozhu ZHANG Junya YUAN Liangfei WU Xin ZHAO Fang GUO Xuehu MEN Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100039China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

Fabric composites are widely applied as self-lubricating liner for radial spherical plain bearings owing to their excellent mechanical and tribological ***,the poor interfacial strength between fibers and the resin matrix limits the performance of composites utilized as *** overcome this drawback,a mild layer-by-layer(LbL)self-assembly method was successfully used to construct hybrid fabric composites in the present *** addition,this investigation addressed the effect of self-assembly cycles on the friction and wear behaviors of hybrid fabric composites under dry sliding *** results demonstrate that fabric composites with three or more self-assembly cycles have significantly enhanced surface activities and anti-wear *** results obtained in this work can provide guidance in the preparation of self-lubricating liner composites and highlight how the LbL self-assembly techniques could influence the properties of hybrid fabric composites.

关键词： LbL self-assembly hybrid fabric wear friction

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New phase space of hardness materials and synergic enhancement of hardness and toughness in superconducting Ti2Co and Ti4Co2X (X = B, C, N, O)

arXiv

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arXiv 2025年

作者： Shi, Lifen Ma, Keyuan Hou, Jingyu Ying, Pan Wang, Ningning Xiang, Xiaojun Yang, Pengtao Yu, Xiaohui Gou, Huiyang Sun, Jianping Uwatoko, Yoshiya von Rohr, Fabian O. Zhou, Xiang-Feng Wang, Bosen Cheng, Jinguang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Max-Planck-Institute for Chemical Physics of Solids Dresden01187 Germany Department of Chemistry University of Zurich ZurichCH-8057 Switzerland Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology School of Science Yanshan University Qinhuangdao066004 China Institute of Atomic and Molecular Physics Sichuan University Chengdu61006S China Center for High Pressure Science and Technology Advanced Research Xibeiwang East Rd. Haidian Beijing100094 China Institute for Solid State Physics University of Tokyo Kashiwanoha 5-1-5 Kashiwa Chiba277-8581 Japan Department of Quantum Matter Physics University of Geneva GenevaCH-1211 Switzerland

Compared to traditional superhard materials with high electron density and strong covalent bonds, alloy materials mainly composed of metallic bonding structures typically have great toughness and lower hardness. Breaking through the limits of alloy materials is a preface and long-term topic, which is of great significance and value for improving the comprehensive mechanical properties of alloy materials. Here, we report on the discovery of a cubic alloy semiconducting material Ti2Co with large Vickers of hardness Hvexp ~ 6.7 GPa and low fracture toughness of KICexp ~ 1.51 MPa·m1/2. Unexpectedly, the former value is nearly triple of the Hvcal ~ 2.66 GPa predicted by density functional theory (DFT) calculations and the latter value is about one or two orders of magnitude smaller than that of ordinary titanium alloy materials (KICexp ~ 30-120 MPa·m1/2). These specifications place Ti2Co far from the phase space of the known alloy materials, but close to medium hardness materials such as MgO or TiO2. Upon incorporation of oxygen into structural void positions, both values were simultaneously improved for Ti4Co2O to ~ 9.7 GPa and ~ 2.19 MPa·m1/2, respectively. Further DFT calculations on the electron localization function of Ti4Co2X (X = B, C, N, O) vs. the interstitial elements indicate that these simultaneous improvements originate from the coexistence of Ti-Co metallic bonds, the emergence of newly oriented Ti-X covalent bonds, and the increase of electron concentration. Moreover, the large difference between Hvexp and Hvcal of Ti2Co suggests underlying mechanism concerning the absence of the O(16d) or Ti2-O bonds in the O-(Ti2)6 octahedron. Our discovery expands the phase space of alloy materials and illuminates the path of exploring superconducting materials with excellent mechanical performances. Copyright © 2025, The Authors. All rights reserved.

关键词： Titanium alloys

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Single pair of multi-Weyl points in nonmagnetic crystals

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physical Review B 2022年第19期106卷 195129-195129页

作者： Xiaotian Wang Feng Zhou Zeying Zhang Weikang Wu Zhi-Ming Yu Shengyuan A. Yang School of Physical Science and Technology Southwest University Chongqing 400715 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore 487372 Singapore 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

Topological semimetal states having the minimal number, i.e., only a single pair, of Weyl points are desirable for the study of effects associated with chiral topological charges. So far, the search for such states is focused on magnetic spinful systems. Here, we find that nonmagnetic spinless systems can host a class of single-pair-Weyl-point (SP-WP) states, where the two Weyl points are located at two high-symmetry time-reversal-invariant momenta. We identify 38 candidate space groups that host such states, and we show that the chiral charge of each Weyl point must be an even integer, representing a multi-Weyl point. Besides achieving the minimal number, the two points in SP-WP states are far separated in momentum space, making the physics of each individual point better exposed. The large separation combined with the even topological charge lead to extended surface Fermi loops with a noncontractible winding topology on the surface Brillouin zone torus, distinct from conventional Weyl semimetals. We confirm our proposal in the phonon spectra of two concrete materials TlBO2 and KNiIO6. Our finding applies to a wide range of systems, including electronic, phononic, and various artificial systems. It offers a new direction for the search of ideal platforms to study chiral particles.

关键词： Acoustic phonons Phonons Symmetry protected topological states Topological phases of matter Topological materials Weyl semimetal Density functional theory k dot p method

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Hot entanglement? - Parametrically coupled quantum oscillators in two heat baths: instability, squeezing and driving

arXiv

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arXiv 2022年

作者： Arısoy, Onat Hsiang, Jen-Tsung Hu, Bei-Lok Chemical Physics Program Institute for Physical Science and Technology University of Maryland College ParkMD20742 United States Center for High Energy and High Field Physics National Central University Taoyuan320317 Taiwan Maryland Center for Fundamental Physics Joint Quantum Institute University of Maryland College ParkMD20742 United States

Entanglement being a foundational cornerstone of quantum sciences and the primary resource in quantum information processing, understanding its dynamical evolution in realistic conditions is essential. Unfortunately, numerous model studies show that degradation of entanglement from a quantum system’s environment, especially thermal noise, is almost unavoidable. Thus the appellation ‘hot entanglement’ appears like a contradiction, until Galve et al [Phys. Rev. Lett. 105 180501 (2010)] announced that entanglement can be kept at high temperatures if one considers a quantum system with time-dependent coupling between the two parties, each interacting with its individual bath. With the goal of understanding the sustenance of entanglement at high temperatures, working with the same model and set up as Galve et al, namely, parametrically-driven coupled harmonic oscillators interacting with their own Markovian baths, this work probes into the feasibility of ‘hot entanglement’ from three aspects listed in the subtitle. Our findings show that 1) hot entanglement functions only in the unstable regimes, 2) instability is a necessary but not sufficient condition, and 3) the power intake required by the drive operating in the unstable regime to sustain entanglement increases exponentially. The last factor indicates that hot entanglement under this modeling is theoretically untenable and its actual implementation likely unattainable. Copyright © 2022, The Authors. All rights reserved.

关键词： Quantum optics

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