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Magnetic Control of Soft Chiral Phonons in PbTe

Physical Review Letters 2022年第7期128卷 075901-075901页

作者： Andrey Baydin Felix G. G. Hernandez Martin Rodriguez-Vega Anderson K. Okazaki Fuyang Tay G. Timothy Noe, II Ikufumi Katayama Jun Takeda Hiroyuki Nojiri Paulo H. O. Rappl Eduardo Abramof Gregory A. Fiete Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Instituto de Física Universidade de São Paulo São Paulo São Paulo 05508-090 Brazil Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais São José dos Campos São Paulo 12201-970 Brazil Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama 240-8501 Japan Institute for Materials Research Tohoku University Sendai 980-8577 Japan Department of Physics Northeastern University Boston Massachusetts 02115 USA Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA Department of Material Science and NanoEngineering Rice University Houston Texas 77005 USA

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 Letter reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field.

关键词： Chirality Diamagnetism Magneto-dielectric effect Optical phonons Thermal conductivity Zeeman effect Terahertz time-domain spectroscopy

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Perovskite superlattices with efficient carrier dynamics

Research Square

引用

Research Square 2021年

作者： Xu, Sheng Lei, Yusheng Li, Yuheng Lu, Chengchangfeng Yan, Qizhang Gong, Huaxin Zhang, Song Zhou, Jiayun Zhang, Ruiqi Chen, Yimu Tsai, Hsinhan Gu, Yue Hu, Hongjie Lo, Yu-Hwa Nie, Wanyi Lee, Taeyoon Luo, Jian Yang, Kesong Jang, Kyung-In Department of Nanoengineering University of California San Diego La Jolla CA92093-0448 United States Department of Chemical Engineering Stanford University StanfordCA94305 United States Department of Electrical and Computer Engineering University of California San Diego La Jolla CA92093 United States Material Science and Engineering Program University of California San Diego La Jolla CA92093-0418 United States Los Alamos National Laboratory Los AlamosNM87545 United States School of Electrical and Electronic Engineering Yonsei University Seoul03722 Korea Republic of Department of Bio and Brain Engineering Korea Institute of Science and Technology Korea Republic of Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology Daegu42988 Korea Republic of Department of Bioengineering University of California San Diego La Jolla CA92093-0412 United States

Compared with their three-dimensional counterparts, low-dimensional metal halide perovskites with periodic inorganic/organic structures have shown promising stability and hysteresis-free electrical performance, which paves the way for next-generation optoelectronic devices. However, when integrated in devices, they have relatively limited efficiencies because devices usually require carrier transport through the film thickness direction. In conventionally grown single crystals, the carrier transport in the thickness direction is hindered by the insulating organic spacers. In addition, the strong quantum confinement from the organic spacers limits the generation and transport of free carriers. The carrier dynamics is further compromised by the presence of grain boundaries in polycrystals. Here, we report a low-dimensional metal halide perovskite superlattice with efficient carrier transport in three dimensions by epitaxial growth. Epitaxy on a slightly lattice-mismatched substrate compresses the organic spacers in the superlattice, which weakens the quantum confinement and further improves carrier dynamics. The performance of a low-dimensional perovskite superlattice solar cell has been certified under the quasi-steady state for the first time. Moreover, the device shows an unusually high open-circuit voltage, due to a unique intra-band exciton relaxation mechanism. © 2021, CC BY.

关键词： Grain boundaries

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Microscopic picture of paraelectric perovskites from structural prototypes

arXiv

引用

arXiv 2021年

作者： Kotiuga, Michele Halilov, Samed Kozinsky, Boris Fornari, Marco Marzari, Nicola Pizzi, Giovanni École Polytechnique Fédérale de Lausanne LausanneCH-1015 Switzerland Designed Material Technologies LLC P.O. Box 14548 RichmondVA23221-9998 United States John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford Street CambridgeMA02138 United States Robert Bosch LLC Research and Technology Center CambridgeMA02139 United States Department of Physics Science of Advanced Materials Program Central Michigan University Mt. PleasantMI48859 United States

We highlight with first-principles molecular dynamics the persistence of intrinsic h111i Ti off-centerings for BaTiO3 in its cubic paraelectric phase. Intriguingly, these are inconsistent with the Pm¯3m space group often used to atomistically model this phase using density functional theory or similar methods. Therefore we deploy a systematic symmetry analysis to construct representative structural models in the form of supercells that satisfy a desired point symmetry but are built from the combination of lower-symmetry primitive cells. We define as structural prototypes the smallest of these that are both energetically and dynamically stable. Remarkably, two 40-atom prototypes can be identified for paraelectric BaTiO3;these are also common to many other ABO3 perovskites. These prototypes can offer structural models of paraelectric phases that can be used for the computational engineering of functional materials. Last, we show that the emergence of B-cation off-centerings and the primitive-cell phonon instabilities is controlled by the equilibrium volume, in turn dictated by the filler A cation. © 2021, CC BY.

关键词： Positive ions

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A Comparative study of TeO 2 concentration on zinc barium boro-tellurite glass doped with Sm 3+

引用

materials Today: Proceedings 2019年 17卷 1809-1814页

作者： A. Suaif L. Yuliantini M. Djamal J. Kaewkhao P. Yasaka Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung 40132 Indonesia Center of Excellence in Glass Technology and Material Sciences Nakhon Pathom Rajabhat University 73000 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand

Properties of Sm 3+ doped zinc barium boro-tellurite glass (ZBBT glass) with the formula 10TeO 2 -35B 2 O 3 -30BaO-24ZnO-1Sm 2 O 3 and 35TeO 2 -10B 2 O 3 -30BaO-24ZnO-1Sm 2 O 3 prepared by conventional melt quenching technique and their physical, optical and photoluminescence properties were investigated. The physical properties have been measured using a densitometer kit based on Archimedes’ principle. The result of the measurement shows that ZBBT glass with the higher TeO 2 concentration have higher value in density and molar volume, but it has the lower value in the lifetime. The UV-VIS-NIR absorption spectra were recorded at room temperature in the wavelength range of 200-2,500 nm. From the measurement, it is known that glass with 10 mol% of TeO 2 have a higher absorbance value compared to 35 mol% of TeO 2 . Seven luminescence bands in excitation spectra represent the transitions from the ground state 6 H 5/2 to various excited states. Furthermore, the emission spectra were observed under 403 nm light from the xenon flash lamps, four luminescence bands were observed at 562 nm ( 4 G 5/2 → 6 H 5/2 ), 598 nm ( 4 G 5/2 → 6 H 7/2 ), 645 nm ( 4 G 5/2 → 6 H 9/2 ) and 706 nm ( 4 G 5/2 → 6 H 11/2 ), intense reddish orange emission was found at 598 nm.

关键词： Boro-tellurite glass Sm 3+ doped optical property photoluminescence

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Correction to: Improvement of recycled concrete aggregate using alkali-activated binder treatment

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materials and Structures 2022年第1期55卷 1-1页

作者： Damrongwiriyanupap, Nattapong Wachum, Akaraphol Khansamrit, Kamonphop Detphan, Satakhun Hanjitsuwan, Sakonwan Phoo-ngernkham, Tanakorn Sukontasukkul, Piti Li, Long-yuan Chindaprasirt, Prinya Department of Civil Engineering School of Engineering University of Phayao Phayao Thailand Sustainable Construction Material Technology Research Unit Department of Civil Engineering Faculty of Engineering and Technology Rajamangala University of Technology Isan Nakhon Ratchasima Thailand Program of Civil Technology Faculty of Industrial Technology Lampang Rajabhat University Lampang Thailand Construction and Building Materials Research Center Department of Civil Engineering Faculty of Engineering King Mongkut’s University of Technology-North Bangkok Bangkok Thailand School of Engineering Faculty of Science and Engineering Plymouth University Plymouth United Kingdom Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University Khon Kaen Thailand Academy of Science The Royal Society of Thailand Dusit Bangkok Thailand

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Effect of starch addition on grafting efficiency on PVOH-coated surface layer

引用

Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第3期51卷 39-44页

作者： Choi, Kyoung-Hwa Kim, Doo-Hyun Ryu, Jeong-Yong Lee, Myoung-Ku Changgang Institute of Paper Science and Technology Kangwon National University Chunchon24341 Korea Republic of Tailim Paper Co. Ltd. Ansan15609 Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Science Kangwon National University Chunchon24341 Korea Republic of

This study was conducted to find the possibility of replacing synthetic polymer polyvinyl alcohol (PVOH) with a natural polymer starch in manufacturing PVOH-coated paper for food packaging. Accordingly, different amounts of starches containing PVOH were coated on paper. Further, esterification was performed with palmitoyl chloride using the gas chromatography grafting technology. The grafting efficiency was evaluated using the Cobb size value and static contact angle of the PVOH-starch coated paper varying the addition amount of starch. The addition of starch resulted in an increased Cobb size value and a decreased static contact angle of the coated paper. These changes were proportional to the amount of starch mixed with PVOH, resulting from a reduction in the proportion of the hydroxyl groups available. Therefore, the grafted fatty acid content also decreased with the increasing amount of starch added. However, these results conclude that environment friendly starch can be substituted for PVOH in packaging substrate with hydrophobicity because no significant decrease in the hydrophobicity of the PVOH-starch coated paper was observed with less than 10% of starch. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Starch

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Compliant lightweight non-invasive standalone“Marine Skin”tagging system

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npj Flexible Electronics 2018年第1期2卷 97-105页

作者： Joanna M.Nassar Sherjeel M.Khan Seneca J.Velling Andrea Diaz-Gaxiola Sohail F.Shaikh Nathan R.Geraldi Galo A.Torres Sevilla Carlos M.Duarte Muhammad M.Hussain mmh Labs Computer Electrical Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Material&Nanoscience Program Faculty of ScienceUniversity of WaterlooWaterlooON N2L-3G1Canada Red Sea Research Center(RSRC) Biological and Environmental Sciences and Engineering(BESE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Current marine research primarily depends on weighty and invasive sensory equipment and telemetric network to understand the marine environment,including the diverse fauna it contains,as a function of animal behavior and size,as well as equipment *** match animal morphology and activity within the surrounding marine environment,here we show a physically flexible and stretchable skin-like and waterproof autonomous multifunctional system,integrating Bluetooth,memory chip,and high performance physical *** sensory tag is mounted on a swimming crab(Portunus pelagicus)and is capable of continuous logging of depth,temperature,and salinity within the harsh ocean *** fully packaged,ultra-lightweight(<2.4 g in water),and compliant“Marine Skin”system does not have any wired connection enabling safe and weightless cuttingedge approach to monitor and assess marine life and the ecosystem’s health to support conservation and management of marine ecosystems.

关键词： Marine system Skin

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Flash-Induced Spreading of Metals on Zirconia

SSRN

引用

SSRN 2019年

作者： Kiniger, Giovanni Sglavo, Vincenzo Jha, Shikhar K. Raj, Rishi Materials Science and Engineering Program Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States Department of Industrial Engineering University of Trento Trento38123 Italy Department of Material Science and Engineering Indian Institute of Technology UP Kanpur208016 India

Gold islands deposited on yttria stabilized zirconia disperse into very small islands when the ceramic substrate activated by current in a flash experiment. It is postulated that the gold beads spread into a nanometer thick continuous metal layer, which fragments into islands on a very fine scale when the field is switched off and the substrate returns to its original state. The flash induced wetting is explained in terms of a recent report that zirconia develops metallic character at the onset of flash, but reverts quickly to the pure ionic state when the field is turned off. © 2019, The Authors. All rights reserved.

关键词： Zirconia

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Revealing the Origin of Transition-Metal Migration in Layered Sodium-Ion Battery Cathodes: Random Na Extraction and Na-Free Layer Formation

引用

Angewandte Chemie 2023年第12期135卷

作者： Dr. Shiyong Chu Prof. Duho Kim Gwanghyeon Choi Chunchen Zhang Haoyu Li Prof. Wei Kong Pang Yameng Fan Anita M. D'Angelo Prof. Shaohua Guo Prof. Haoshen Zhou College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Frontiers Science Center for Critical Earth Material Cycling Nanjing University Nanjing 210023 China Shenzhen Research Institute of Nanjing University Shenzhen 518000 China Department of Mechanical Engineering (Integrated Engineering Program) Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 17104 (Republic of Korea Institute for Superconducting & Electronic Materials University of Wollongong Wollongong NSW-2522 Australia Australian Synchrotron Australian Nuclear Science and Technology Organization 800 Blackburn Road Clayton Victoria 3168 Australia

Cation migration often occurs in layered oxide cathodes of lithium-ion batteries due to the similar ion radius of Li and transition metals (TMs). Although Na and TM show a big difference of ion radius, TMs in layered cathodes of sodium-ion batteries (SIBs) can still migrate to Na layer, leading to serious electrochemical degeneration. To elucidate the origin of TM migration in layered SIB cathodes, we choose NaCrO 2 , a typical layered cathode suffering from serious TM migration, as a model material and find that the TM migration is derived from the random desodiation and subsequent formation of Na-free layer at high charge potential. A Ru/Ti co-doping strategy is developed to address the issue, where the doped active Ru is first oxidized to create a selective desodiation and the doped inactive Ti can function as a pillar to avoid complete desodiation in Ru-contained TM layers, leading to the suppression of the Na-free layer formation and subsequent enhanced electrochemical performance.

关键词： Layered Sodium-Ion Battery Cathodes Na-Free Layer Random Na Extraction Selective Na Extraction Transition-Metal Migration

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Overcoming the surface paradox: Buried perovskite quantum dots in wide-bandgap perovskite thin films

arXiv

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arXiv 2025年

作者： Zhang, Hao Pasha, Altaf Metcalf, Isaac Zhou, Jianlin Staunstrup, Mathias Zhu, Yunxuan Liao, Shusen Ssennyimba, Ken Chen, Jia-Shiang Reddy, Surya Prakash Thébaud, Simon Hou, Jin Shuai, Xinting Mandani, Faiz Sidhik, Siraj Jones, Matthew R. Ma, Xuedan Balakrishna, R. Geetha Susarla, Sandhya Ginger, David S. Katan, Claudine Kanatzidis, Mercouri G. Bawendi, Moungi G. Natelson, Douglas Tamarat, Philippe Lounis, Brahim Even, Jacky Mohite, Aditya D. Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Centre for Nano and Material Sciences Jain University Jain Global Campus Kanakapura Karnataka Bangalore562112 India Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Université de Bordeaux LP2N Talence France Institut d’Optique CNRS LP2N Talence France Department of Physics and Astronomy Rice University HoustonTX77005 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85281 United States UMR 6082 CNRS INSA de Rennes Rennes35708 France Department of Chemistry Rice University HoustonTX77005 United States Department of Chemistry University of Washington Box 351700 SeattleWA98195-1700 United States UMR 6226 Rennes35000 France Department of Chemistry Northwestern University EvanstonIL United States Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States

Colloidal perovskite quantum dots (PQDs) are an exciting platform for on-demand quantum, and classical optoelectronic and photonic devices. However, their potential success is limited by the extreme sensitivity and low stability arising from their weak intrinsic lattice bond energy and complex surface chemistry. Here we report a novel platform of buried perovskite quantum dots (b-PQDs) in a three-dimensional perovskite thin-film, fabricated using one-step, flash annealing, which overcomes surface related instabilities in colloidal perovskite dots. The b-PQDs demonstrate ultrabright and stable single-dot emission, with resolution-limited linewidths below 130 μeV, photon-antibunching (g2(0)=0.1), no blinking, suppressed spectral diffusion, and high photon count rates of 104/s, consistent with unity quantum yield. The ultrasharp linewidth resolves exciton fine-structures (dark and triplet excitons) and their dynamics under a magnetic field. Additionally, b-PQDs can be electrically driven to emit single photons with 1 meV linewidth and photon-antibunching (g2(0)=0.4). These results pave the way for on-chip, low-cost single-photon sources for next generation quantum optical communication and sensing. © 2025, CC BY.

关键词： Photons

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