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arXiv 2022年

作者： Song, Dongsheng Wang, Weiwei Yu, Jie-Xiang Zhang, Peng Pershoguba, Sergey S. Yin, Gen Wei, Wensen Jiang, Jialiang Ge, Binghui Fan, Xiaolong Tian, Mingliang Rosch, Achim Zang, Jiadong Du, Haifeng Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Anhui Chinese Academy of Sciences Hefei230031 China School of Physical Science and Technology Soochow University Suzhou215006 China Key Laboratory for Magnetism and Magnetic Materials The Ministry of Education Lanzhou University Lanzhou730000 China Department of Physics and Astronomy University of New Hampshire DurhamNH03824 United States Department of Physics Georgetown University WashingtonDC20057 United States Science Island Branch of Graduate School University of Science and Technology of China Anhui Hefei230026 China School of Physics and Materials Science Anhui University Hefei230601 China Institute for Theoretical Physics University of Cologne Cologne50937 Germany Materials Science Program University of New Hampshire DurhamNH03824 United States

The interplay between dimensionality and topology manifests in magnetism via both exotic texture morphology and novel dynamics. A free magnetic skyrmion exhibits the skyrmion Hall effect under electric currents. Once it is confined in one-dimensional (1D) channels, the skyrmion Hall effect would be suppressed, and the current-driven skyrmion speed should be boosted by the non-adiabatic spin transfer torque β. Here, we experimentally demonstrate that stripes of a spatially modulated spin helix serve as natural 1D channels to restrict skyrmion. Using FeGe as a benchmark, an interstitial skyrmion is created by geometry notch and further moves steadily without the skyrmion Hall effect. The slope of the current-velocity curve for 1D skyrmion is enhanced almost by an order of magnitude owing to a large β in FeGe. This feature is also observed in other topological defects. Utilizing the 1D skyrmion dynamics would be a highly promising route to implement topological spintronic devices. © 2022, CC BY.

关键词： Germanium compounds

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Gallium Oxide as Photonic Integrated Platforms in the UV–Visible Spectra

Gallium Oxide as Photonic Integrated Platforms in the UV–Vi...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jingan Zhou Xuan Zhao Rui Xu Xiang Zhang Kai Fu Tao Li Mingfei Xu Shisong Luo Ziyi He Jacob T. Robinson Hanyu Zhu Pulickel M. Ajayan Xiaodong Zhang Yuji Zhao Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA School of Electrical Computer and Energy Engineering Arizona State University Tempe Arizona USA Nanofabrication Facility Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou China

We report the Ga 2 O 3 as photonic integrated platforms and its nonlinear optical effects in the UV–visible spectra. A low propagation loss of 3.7 dB/cm and second-order susceptibility of χ (2) =4.89×10 -3 pm... 详细信息

ISBN: (纸本)9781957171258

关键词： Material properties Nonlinear effects Nonlinear susceptibility Optical components Thin films Visible light communications

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Rapid Electronic Transport Channel of Co-P with Mo in a Heterostructure Embedded with P, N Dual Doped Porous Carbon for Electrocatalytic Oxygen and Hydrogen Evolution

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ChemNanoMat 2024年第7期10卷

作者： Dey, Tapan Rajput, Anubha Jhaa, Gaurav Matsagar, Babasahab M. Chen, Norman C.-R Kumar, Nitish Salunkhe, Rahul Wu, Kevin C.-W. Chakraborty, Biswarup Dutta, Saikat Electrochemical Energy & Sensor Research Laboratory Amity Institute of Click Chemistry Research & Studies Amity University Noida India Department of Chemistry Indian Institute of Technology Delhi Hauz Khas New Delhi110016 India Chemical Information Sciences Laboratory Department of Chemistry Pondicherry University Kalapet Pondicherry605014 India Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Materials Research Laboratory Department of Physics Indian Institute of Technology Jammu Jammu India Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Chung-Li Taiwan Department of Chemical Engineering Chung Yuan Christian University No. 200 Zhongbei Rd. Zhongli Dist. Taoyuan City320 Taiwan

We developed a molybdenum (Mo)-doped cobalt (Co)-heterostructure embedded on a phosphorous (P) and nitrogen (N) dual-doped porous carbon which exhibits an intrinsic electronic transport channel of Co to Mo and P. The P,Mo,O−Co/PNC/NF (NF=Nickel foam) electrode offers 335 mV overpotential at 10 mA cm−2 in OER as compared with PMA-ZIF67-NC/NF and ZIF67-NC/NF electrode with an overpotential of 357 and 373 mV respectively. Linear sweep voltammetry (LSV) of overall water splitting (OWS) supports that the current density gradually increased at a cell potential of 1.6 V with a maximum of 40 mA with a corresponding cell potential of 1.79 V at a current density of 10 mA cm−2. Density functional theory (DFT) calculations for water adsorption on optimized [111] surface of Co, CoMo, and CoMoP2 with adsorbed H2O and corresponding lattice determine the electron density difference of [111] surface with adsorbed H2O for Eads (eV) 4.23 corresponds to adsorption energy for CoMoP2. XANE-EXAFS spectroscopy of P,Mo,O−Co/PNC at Co K edge and Mo K edge suggests the presence of higher valence of both Cox+ and Mox+ without metallic Co and Mo and Co−P and Mo−P bonds as major structural units due to phosphidation as determined by R-space FT-EXAFS spectra. © 2024 Wiley-VCH GmbH.

关键词： Cobalt

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Effect of reducing calcination processing on structural and electrochemical properties of LiNi 0.5 Mn 0.3 Co 0.2 O 2 cathode materials for lithium battery

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Materials Today: Proceedings 2021年 47卷 3600-3603页

作者： Jaruwan Kanthachan Orawan Khamman Uraiwan Intatha Sukum Eitssayeam Master’s Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai 57100 Thailand

Lithium-ion batteries (LIBs) are capable of meeting the challenges associated with next-generation energy storage devices. Use of NMC has grown at 400,000 tons per year in 2025. Because of its performance surpassing that of other cathode materials. Thus, in this work, the synthesis of lithium nickel manganese cobalt oxide (LiNi 0.5 Mn 0.3 Co 0.2 O 2 ; NMC) was doped carbon in the calcination process was investigated. Excellent intercalation of lithium ions transfer between cathode and anode was noted. Differential Thermal Analysis (DTA) results showed that NMC crystalized at 550 °C. Changes were confirmed by using both X-ray diffract meter (XRD) and Scanning Electron Microscope (SEM). The study of the possibility of NMC cathode materials in which the enhancement of electrochemical performance was investigated by charge–discharge capacity in 0.1C-rate were carried out to reveal carbon's effect pristine NMC.

关键词： Lithium-ion batteries Lithium nickel manganese cobalt oxide Energy storage Reducing process calcination Add carbon Areal capacity

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Antiferromagnetic ordering of organic Mott insulator λ-(BEDSe-TTF)2GaCl4

arXiv

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arXiv 2021年

作者： Ito, A. Kobayashi, Takuya Sari, D.P. Watanabe, I. Saito, Y. Kawamoto, A. Tsunakawa, H. Satoh, K. Taniguchi, H. Graduate School of Science and Engineering Saitama University Saitama338-8570 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology Saitama337-8570 Japan Advanced Meson Science Laboratory RIKEN Saitama351-0198 Japan Frankfurt60438 Germany Department of Condensed Matter Physics Graduate School of Science Hokkaido University Sapporo060-0810 Japan

The band structure and magnetic properties of organic charge-transfer salt λ-(BEDSe-TTF)2GaCl4(BEDSe-TTF: bis(ethylenediseleno)tetrathiafulvalene;abbreviated as λ-BEDSe) are investigated. The reported crystal structure is confirmed using X-ray diffraction measurements, and the transfer integrals are calculated. The degree of electron correlation U/W (U: on-site Coulomb repulsion, W: bandwidth) of λ-BEDSe is larger than one and comparable to that of the isostructural Mott insulator λ-(ET)2GaCl4(ET: bis(ethylenedithio)tetrathiafulvalene, abbreviated as λ-ET), whereas the U/W of the superconducting salt λ-(BETS)2GaCl4(BETS: bis(ethylenedithio)tetraselenafulvalene) is smaller than one. 13C-NMR and μSR measurements revealed that λ-BEDSe undergoes an antiferromagnetic (AF) ordering below TN= 22 K. In the AF state, discrete 13C-NMR spectra with a remaining central peak are observed, indicating the commensurate AF spin structure also observed in λ-ET. The similarity between the structural and magnetic properties of λ-BEDSe and λ-ET suggests that both salts are in the same electronic phase, i.e., the physical properties of λ-BEDSe can be understood by the universal phase diagram of bandwidth-controlled λ-type organic conductors obtained by donor molecule substitution. Copyright © 2021, The Authors. All rights reserved.

关键词： Mott insulators

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Reduction of interface defects in gate-recessed GaN HEMTs by neutral beam etching

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Materials Today Advances 2024年 23卷

作者： Yu, Chia Hao Chiang, Wei Hsiang Chen, Yi-Ho Samukawa, Seiji Wuu, Dong Sing Chung, Chin-Han Hsiao, Ching-Lien Horng, Ray Hua Institute of Electronics National Yang Ming Chiao Tung University Department of Materials Science and Engineering National Chung Hsing University Graduate Degree Program of College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Institute of Comunications Engineering National Yang Ming Chiao Tung University Department of Applied Materials and Optoelectronic Engineering National Chi Nan University International College of Semiconductor Technology National Yang Ming Chiao Tung University Thin Film Physics Division Department of Physics Chemistry and Biology (IFM) Linköping University

This study investigates and compares the impact of different etching techniques on the fabrication of GaN high electron mobility transistors (HEMTs) between the inductively coupled plasma reactive ion etching (ICP-RIE) and the neutral beam etching (NBE) for the gate recess. By conducting direct current analysis, it was found that devices manufactured using the NBE exhibited superior electrical performance as compared with those produced using the ICP-RIE. These enhanced electrical characteristics include a transconductance of up to 100.4 mS/mm, a threshold voltage (V_th) of −2.3 V, an on/off current ratio of 1.1 × 10⁹, a subthreshold swing (S.S.) of 99.63 mV/dec, and a remarkably low gate leakage current. Additionally, we noted varying degrees of hysteresis in the I–V characteristics were related to process disparities possibly leading to interface defects. Multi-frequency capacitance-voltage (C–V) measurements were used to identify the interface defects at the oxide/AlGaN interface of the gate. The results revealed that devices fabricated using the NBE exhibited a lower interface defect density as compared with those fabricated using the ICP-RIE, thereby elucidating the reduced hysteresis observed in the I–V characteristics. These findings indicated the significant advantages of the NBE process in the fabrication of GaN HEMTs. © 2024 The Authors

关键词： GaN HEMTs Gate recess Interface defects Multi-frequency C–V Neutral beam etching

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Fractal and Fractional SIS model for syphilis data

arXiv

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arXiv 2023年

作者： Gabrick, Enrique C. Sayari, Elaheh de Souza, Diogo Leonai Marques da Silva Borges, Fernando Trobia, José Lenzi, Ervin K. Batista, Antonio M. Graduate Program in Science State University of Ponta Grossa PR Ponta Grossa84030-900 Brazil Department of Physiology and Pharmacology State University of New York Downstate Health Sciences University BrooklynNY11203 United States Department of Mathematics and Statistics State University of Ponta Grossa PR Ponta Grossa84030-900 Brazil Department of Physics State University of Ponta Grossa PR Ponta Grossa84030-900 Brazil

This work studies the SIS model extended by fractional and fractal derivatives. We obtain explicit solutions for the standard and fractal formulations;for the fractional case, we study numerical solutions. As a real data example, we consider the Brazilian syphilis data from 2011 to 2021. We fit the data by considering the three variations of the model. Our fit suggests a recovery period of 11.6 days and a reproduction ratio (R0) equal to 6.5. By calculating the correlation coefficient (r) between the real data and the theoretical points, our results suggest that the fractal model presents a higher r compared to the standard or fractional case. The fractal formulation is improved when two different fractal orders with distinguishing weights are considered. This modification in the model provides a better description of the data and improves the correlation coefficient. © 2023, CC BY.

关键词： Fractals

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A model with light and heavy scalars in view of the effective theory

arXiv

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arXiv 2021年

作者： Adam, Apriadi Salim Kawamura, Yuta Morozumi, Takuya Serpong PUSPIPTEK Area Selatan Tangerang15314 Indonesia Graduate School of Science Hiroshima University Higashi-Hiroshima739-8526 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8526 Japan Core of Research for the Energetic Universe Hiroshima University Higashi-Hiroshima739-8526 Japan

The low energy effective potential for the model with a light scalar and a heavy scalar is derived. We perform the path integration for both heavy and light scalars and derive the low energy effective potential in terms of only the light scalar. The effective potential is independent of the renormalization scale approximately. By setting the renormalization scale equal to the mass of the heavy scalar, one finds the corrections with the logarithm of the ratio of the two scalar masses. The large logarithm is summed with the renormalization group (RG) and the RG improved effective potential is derived. The improved effective potential includes the one-loop correction of the heavy scalar and the leading logarithmic corrections due to the light scalar. We study the correction to the vacuum expectation value of the light scalar and the dependence on the mass of the heavy scalar. © 2021, CC BY.

关键词： Statistical mechanics

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Two-dimensional perovskites with maximum symmetry enable exciton diffusion length exceeding 2 micrometers

arXiv

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arXiv 2025年

作者： Hou, Jin Fletcher, Jared Hall, Siedah J. Zhang, Hao Zacharias, Marios Volonakis, George Welton, Claire Mandani, Faiz Metcalf, Isaac Sun, Shuo Zhang, Bo Guo, Yinsheng Reddy, G.N. Manjunatha Katan, Claudine Even, Jacky Sfeir, Matthew Y. Kanatzidis, Mercouri G. Mohite, Aditya D. Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Photonics Initiative Advanced Science Research Center City University of New York New York10031 United States Department of Physics The Graduate Center City University of New York New York10016 United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Univ Rennes INSA Rennes CNRS Institut FOTON UMR 6082 Rennes35708 France UMR 6226 RennesF-35000 France University of Lille CNRS Centrale Lille Institute Univ. Artois UMR 8181−UCCS− Unité de Catalyse et Chimie du Solide LilleF-59000 France Department of Chemistry University of Nebraska-Lincoln LincolnNE68588 United States

Realizing semiconductors with high symmetry of their crystallographic structures has been a virtue of inorganic materials and has resulted in novel physical behaviors. In contrast, hybrid (organic and inorganic) crystals such as two-dimensional metal halide perovskites exhibit much lower crystal symmetry due to in-plane or out-of-plane octahedral distortions. Despite their amazing ability for photoinduced light emission at room temperature, the Achilles' heel of this attractive class of 2D materials for optoelectronics remains the poor control and lack of performance for charge carrier transport. Inspired by the tremendous charge carrier properties of the 3D cubic perovskite phase (α) of FAPbI3 and combining the use of the appropriate cage cation, the spacer molecule and the temperature and rate of crystallization, we report a new series of FA-based layered two-dimensional perovskites that exhibits the highest theoretically predicted symmetry with a tetragonal P4/mmm space group, resulting in no octahedral distortion in both in-plane and out-of-plane directions. These 2D perovskites present the shortest interlayer distances (4 Å), which results in systematically lower bandgaps (1.7 to 1.8 eV). Finally, the absence of octahedral distortions, results in an exciton diffusion length of 2.5 µm, and a diffusivity of 4.4 cm2s-1, both of which are an order of magnitude larger compared to previously reported 2D perovskites and on par with monolayer transition metal dichalcogenides. © 2025, CC BY.

关键词： Charge carriers

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Thermalization of fluorescent protein exciton-polaritons at room temperature

arXiv

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arXiv 2022年

作者： Satapathy, Sitakanta Liu, Bin Deshmukh, Prathmesh Molinaro, Paul M. Dirnberger, Florian Khatoniar, Mandeep Koder, Ronald L. Menon, Vinod M. Department of Physics Center for Discovery and Innovation The City College of New York 85 St. Nicholas Terrace New YorkNY10031 United States The PhD Program in Physics The Graduate Center of the City University of New York 365 5th Ave New YorkNY10016 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States

Fluorescent proteins (FPs) have recently emerged as a serious contender for realizing ultra-low threshold room temperature exciton-polariton condensation and lasing. Our contribution investigates the thermalization of FP microcavity exciton-polaritons upon optical pumping under ambient conditions. We realize polariton cooling using a new FP molecule, called mScarlet, coupled strongly to the optical modes in a Fabry-Pérot cavity. Interestingly, at the threshold excitation energy (fluence) of ~9 nJ/pulse (15.6 mJ/cm2), we observe an effective temperature, Teff ~350 ± 35 K close to the lattice temperature indicative of strongly thermalized exciton-polaritons at equilibrium. This efficient thermalization results from the interplay of radiative pumping facilitated by the energetics of the lower polariton branch and the cavity Qfactor. Direct evidence for dramatic switching from an equilibrium state into a metastable state is observed for the organic cavity polariton device at room temperature via deviation from the Maxwell-Boltzmann statistics at k1 = 0 above the threshold. Thermalized polariton gases in organic systems at equilibrium hold substantial promise for designing room temperature polaritonic circuits, switches, and lattices for analog simulation. © 2022, CC BY-NC-SA.

关键词： Polariton

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