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arXiv 2021年

作者： Baydin, Andrey Hernandez, Felix G.G. Rodriguez-Vega, Martin Okazaki, Anderson K. Tay, Fuyang Timothy Noe, G. Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Rappl, Paulo H.O. Abramof, Eduardo Fiete, Gregory A. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Instituto de Física Universidade de São Paulo SP São Paulo05508-090 Brazil Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais SP São José dos Campos12201-970 Brazil Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Physics Northeastern University BostonMA02115 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode splits into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies display Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are the result of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. Thus, our study reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic fields

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Dynamic compressed sensing for real-Time tomographic reconstruction

arXiv

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arXiv 2020年

作者： Schwartz, Jonathan Zheng, Huihuo Hanwell, Marcus Jiang, Yi Hovden, Robert Department of Material Science and Engineering Ann ArborUniversity of Michigan MichiganMI United States Argonne Leadership Computing Facility Argonne National Laboratory LemontIL United States Kitware Inc Clifton ParkNY United States Advanced Photon Source Facility Argonne National Laboratory LemontIL United States Applied Physics Program University of Michigan Ann ArborMI United States

Electron tomography has achieved higher resolution and quality at reduced doses with recent advances in compressed sensing. Compressed sensing (CS) theory exploits the inherent sparse signal structure to effciently reconstruct three-dimensional (3D) volumes at the nanoscale from un-dersampled measurements. However, the process bottlenecks 3D reconstruction with computation times that run from hours to days. Here we demonstrate a framework for dynamic compressed sens-ing that produces a 3D specimen structure that updates in real-Time as new specimen projections are collected. Researchers can begin interpreting 3D specimens as data is collected to facilitate high-throughput and interactive analysis. Using scanning transmission electron microscopy (STEM), we show that dynamic compressed sensing accelerates the convergence speed by 3-fold while also re-ducing its error by 27% for a Au/SrTiO3 nanoparticle specimen. Before a tomography experiment is completed, the 3D tomogram has interpretable structure within 33% of completion and fine details are visible as early as 66%. Upon completion of an experiment, a high-fidelity 3D visualization is produced without further delay. Additionally, reconstruction parameters that tune data delity can be manipulated throughout the computation without rerunning the entire process. Copyright © 2020, The Authors. All rights reserved.

关键词： Compressed sensing

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Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate

arXiv

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arXiv 2020年

作者： Baza, Hend Turiv, Taras Li, Bing-Xiang Li, Ruipeng Yavitt, Benjamin M. Fukuto, Masafumi Lavrentovich, Oleg D. Department of Physics Kent State University OH United States Advanced Materials and Liquid Crystal Institute Kent State University OH United States Materials Science Graduate Program Kent State University OH United States National Synchrotron Light Source II Brookhaven National Laboratory UptonNY United States Department of Material Science and Chemical Engineering Stony Brook University Stony BrookNY United States

Lyotropic chromonic liquid crystals (LCLCs) represent aqueous dispersions of organic disk-like molecules that form cylindrical aggregates. Despite the growing interest in these materials, their flow behavior is poorly understood. Here, we explore the effect of shear on dynamic structures of the nematic LCLC, formed by 14wt% water dispersion of disodium cromoglycate (DSCG). We employ in-situ polarizing optical microscopy (POM) and small-angle and wide-angle X-ray scattering (SAXS/WAXS) to obtain independent and complementary information on the director structures over a wide range of shear rates. The DSCG nematic shows a shear-thinning behavior with two shear-thinning regions (Region I at γ −1 and Region III at γ > 10 s−1) separated by a pseudo-Newtonian Region II (1 s−1 −1). The material is of a tumbling type. In Region I, γ −1, the director realigns along the vorticity axis. An increase of γ above 1 s-1 triggers nucleation of disclination loops. The disclinations introduce patches of the director that deviates from the vorticity direction and form a polydomain texture. Extension of the domains along the flow and along the vorticity direction decreases with the increase of the shear rate to 10 s−1. Above 10 s−1, the domains begin to elongate along the flow. At γ > 100 s−1, the texture evolves into periodic stripes in which the director is predominantly along the flow with left and right tilts. The period of stripes decreases with an increase of γ. The shear-induced transformations are explained by the balance of the elastic and viscous energies. In particular, nucleation of disclinations is associated with an increase of the elastic energy at the walls separating nonsingular domains with different director tilts. The uncovered shear-induced structural effects would be of importance in the further development of LCLC applications. Copyright © 2020, The Authors. All rights reserved.

关键词： Shear deformation

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Erratum: “Two-dimensional porous graphitic carbon nitride C6N7 monolayer: First-principles calculations” [Appl. Phys. Lett. 119, 142102 (2021)]

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Applied physics Letters 2022年第18期120卷

作者： A. Bafekry M. Faraji M. M. Fadlallah I. Abdolhosseini Sarsari H. R. Jappor S. Fazeli M. Ghergherehchi 1Department of Radiation Application Shahid Beheshti University Tehran Iran 2Micro and Nanotechnology Graduate Program TOBB University of Economics and Technology Sogutozu Caddesi No 43 Sogutozu 06560 Ankara Turkey 3Department of Physics Faculty of Science Benha University 13518 Benha Egypt 4Department of Physics Isfahan University of Technology Isfahan 84156-83111 Iran 5Department of Physics College of Education for Pure Sciences University of Babylon Hilla Iraq 6Department of Material Science and Engineering Sharif University of Technology PO Box 11155-9466 Tehran Iran 7Department of Electrical and Computer Engineering Sungkyunkwan University 16419 Suwon South Korea

The original article1 contains misprints in the values of the elastic parameters. The values of C11 = 258.6 GPa, C22 = 290.8 GPa, and C12 = 70.73 GPa and C13 =

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Spintronic terahertz emission from Ni/Pt bilayer grown on MgO

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Journal of physics: Conference Series 2021年第1期1943卷

作者： J P Ferrolino N I Cabello A De Los Reyes V K Mag-Usara J P Afalla H Bardaloza I C Verona M Talara H Kitahara A Somintac A Salvador M Tani E Estacio Material Science and Engineering Program University of the Philippines Diliman. Diliman Quezon City 1101 Philippines National Institute of Physics College of Science University of the Philippines Diliman Diliman Quezon City 1101 Philippines Research Center for Development of Far Infrared Region University of Fukui Bunkyo 3-9-1 Fukui City 910-8507 Japan

Spintronic THz emission from Ni/Pt bilayer grown on MgO is reported based on the novel THz emitter using metallic structures. The Ni metal was deposited first on a MgO substrate and capped with a thin Pt metal via electron beam deposition. The THz emission data was obtained using a standard terahertz time-domain spectroscopy setup using a Ti: sapphire laser excitation source. Initial measurements were done using 800nm excitation with 7 mW and 185 mW pump powers under upward and downward magnetic field orientations. Polarity reversal of the terahertz signal was observed upon changing the orientation of the magnetic field. Maximum amplitude was found at 0.5 THz with bandwidth up to ~6 THz. A saturation fluence of 85.04 mJ/cm2 was calculated from the pump fluence-dependence plot of the THz peak-to-peak signal. The results are consistent with the spintronic THz emission due to the inverse spin-Hall effect and provide insights for future development and optimizations.

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Anti-Reflective Coating for Flexible Devices Using Plasma Enhanced Chemical Vapor Deposition Technique 23

Anti-Reflective Coating for Flexible Devices Using Plasma En...

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23rd International Conference on Optical MEMS and Nanophotonics, OMN 2018

作者： Monne, Mahmuda Akter Zaid, Almusaied Mia, Dalim Khanal, Jagadish Zakhidov, Alexender Chen, Maggie Yihong Material Science Engineering and Commercialization Program Texas State University San MarcosTX United States Ingram School of Engineering Texas State University San MarcosTX United States Department of Physics Texas State University San MarcosTX United States

ISBN: (纸本)9781509063727

In this work, high performance anti-reflective coating (ARC) is achieved using plasma enhanced chemical vapor deposition (PECVD) on the flexible substrate at 100°C, which is the lowest growth temperature reported so far. PECVD is used to deposit double-layer ARC (DLARC) of SiOx and SiNx (wavelengths between 600 nm and 700 nm) on nylon-6. Optical parameters of different deposited layers are controlled by varying gas flow ratio, growth temperature, and chamber pressure. It has been observed that the bare nylon-6 has a reflection of about 4% itself, and with the DLARC the reflection of light is reduced by about 50%. © 2018 IEEE.

关键词： Refractive index

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Erratum “15.9% organic tandem solar cell with extended near-infrared absorption” [Appl. Phys. Lett. 116, 153501 (2020)]

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Applied physics Letters 2021年第21期118卷

作者： Xinjing Huang Bangjin Sun Yongxi Li Chao Jiang Dejiu Fan Jian Fan Stephen R. Forrest 1Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA 2Institute of Functional Nano and Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University Suzhou Jiangsu 215123 China 3Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109 USA 4Department of Physics and Material Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA

The authors regret that a related article was not cited in the original published article.1 In the first paragraph, the sentence “We introduce a surface treatme

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Extended Drude Model for Intraband-Transition-Induced Optical Nonlinearity

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Physical Review Applied 2019年第6期11卷 064062-064062页

作者： Heng Wang Kang Du Chuhao Jiang Zhiqiang Yang Lixia Ren Wending Zhang Soo Jin Chua Ting Mei MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi’an 710072 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 LEES Program Singapore-MIT Alliance for Research & Technology (SMART) 1 CREATE Way #10-01 CREATE Tower Singapore 138602

No existing model has completely explained the physics of the optical nonlinearity for epsilon-near-zero materials, which have recently emerged as candidates for design and fabrication of active nanophotonic devices. We propose to extend the Drude model by adopting a weighted electron effective mass, which takes into account the electron distribution in the nonparabolic conduction band. The extended Drude model is able to interpret the cause of the nonlinearity and provide a functional relationship between the refractive index and wavelength. Both the band nonparabolicity and the temperature-dependent mobility are responsible for the intraband-transition-induced optical nonlinearity. The spectrally resolved nonlinear refractive index and nonlinear susceptibilities are obtained from this model. The results can be applied to other transparent conducting oxides and will help in the design and modeling of spectral responses of nonlinear plasmonic devices.

关键词： Electronic transitions Nonlinear optical susceptibility Optoelectronics Plasmonics Ultrafast optics Thin films Free-electron model Ultrafast pump-probe spectroscopy

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Lithium-Ion Batteries: Operando Magnetometry Probing the Charge Storage Mechanism of CoO Lithium-Ion Batteries (Adv. Mater. 12/2021)

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Advanced materials 2021年第12期33卷

作者： Hongsen Li Zhengqiang Hu Qingtao Xia Hao Zhang Zhaohui Li Huaizhi Wang Xiangkun Li Fengkai Zuo Fengling Zhang Xiaoxiong Wang Wanneng Ye Qinghao Li Yunze Long Qiang Li Shishen Yan Xiaosong Liu Xiaogang Zhang Guihua Yu Guo-Xing Miao College of Physics Center for Marine Observation and Communications Qingdao University Qingdao 266071 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China College of Material Science and Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA Department of Electrical and Computer Engineering & Institute for Quantum Computing University of Waterloo Waterloo ON N2L 3G1 Canada

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Reconstruction of Color Mixing Model Using Tunable Light-Emitting Diode with Unequal Radiated Power

Reconstruction of Color Mixing Model Using Tunable Light-Emi...

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Optoelectronics Global Conference (OGC)

作者： Revantino R. A. Mangkuto A. R. Sanjaya J. K. Putra F. X. N. Soelami R. M. Soegijanto Faridah Center for Material and Technical Product (B4T) Ministry of Industry of the Republic of Indonesia Bandung Indonesia Engineering Physics Program Institut Teknologi Bandung Bandung Indonesia Engineering Physics Program Universitas Gadjah Mada Yogyakarta Indonesia

Experiment used single chip of high power Light-emitting Diode (LED) was conducted to construct a model of color mixing. The used LED consisted of red-green-blue (RGB) components and formed into simple bulb prototype. The light intensity of each color could be adjusted by Arduino type microcontroller, with variation input levels from 0 to 250. It was obtained from initial characterization, by set same input levels, each color component had unequal peak of radiated power. Data processing and analysis were performed by multi-linear regression, to determine a linking matrix between Arduino's input levels and mixed output in tri-stimulus values. By determining tuning coefficients from equalization of radiated power; it yielded evenly distribution of chromaticity coordinates in CIE-1931 diagram compared to initial model.

关键词： Image color analysis Mathematical model Light emitting diodes Color Tuning Prototypes Microcontrollers

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