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Revealing the pseudogap in Sr3(Ru0.985Fe0.015)2O7 by optical spectroscopy

Physical Review B 2018年第20期98卷 205111-205111页

作者： W. J. Ban B. Xu W. H. Li Y. Wang J. J. Ge P. G. Li R. Yang Y. M. Dai Z. Q. Mao H. Xiao Center for High Pressure Science and Technology Advanced Research Beijing 100094 China University of Fribourg Department of Physics and Fribourg Center for Nanomaterials Chemin du Musée 3 CH-1700 Fribourg Switzerland Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics and Engineering Physics Tulane University New Orleans Louisiana 70118 USA Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China

We report resistivity, magnetization, and optical spectroscopy study on single-crystal sample of Sr3(Ru0.985Fe0.015)2O7. An upturn is observed in resistivity at about 30 K. Below 30 K, the dip in resistivity R(ω), the suppression in scattering rate 1/τ(ω), the peaklike feature in optical conductivity σ1(ω), and the remainder of spectral weight all suggest the formation of a pseudogap. In addition, one phonon peak at about 600cm−1 is distinguished at all temperatures, which has asymmetric line shape. Such asymmetric line shape can be fit by a Fano function, and the resulting Fano factor 1/q2 and linewidth γ show significant increases below 30 K, giving further evidence for the formation of a pseudogap, which might originate from the partial k-space gap opening due to density wave instability.

关键词： Band gap Nesting Optical conductivity Phonons Pseudogap Spin density waves Strong interaction Superconductors Magnetization measurements Resistivity measurements

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A Phthalocyanine‐Based Layered Two‐Dimensional Conjugated Metal–Organic Framework as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

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Angewandte Chemie 2019年第31期131卷

作者： Haixia Zhong Khoa Hoang Ly Mingchao Wang Yulia Krupskaya Xiaocang Han Jichao Zhang Jian Zhang Vladislav Kataev Bernd Büchner Inez M. Weidinger Stefan Kaskel Pan Liu Mingwei Chen Renhao Dong Xinliang Feng Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden Technische Universität Dresden 01062 Dresden Germany Leibnitz Institute for Solid State and Materials Research IFW Helmholtzstraße 20 01069 Dresden Germany State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21214 USA

Layered two‐dimensional (2D) conjugated metal–organic frameworks (MOFs) represent a family of rising electrocatalysts for the oxygen reduction reaction (ORR), due to the controllable architectures, excellent electrical conductivity, and highly exposed well‐defined molecular active sites. Herein, we report a copper phthalocyanine based 2D conjugated MOF with square‐planar cobalt bis(dihydroxy) complexes (Co‐O 4 ) as linkages (PcCu‐O 8 ‐Co) and layer‐stacked structures prepared via solvothermal synthesis. PcCu‐O 8 ‐Co 2D MOF mixed with carbon nanotubes exhibits excellent electrocatalytic ORR activity ( E 1/2 =0.83 V vs. RHE, n =3.93, and j L =5.3 mA cm −2 ) in alkaline media, which is the record value among the reported intrinsic MOF electrocatalysts. Supported by in situ Raman spectro‐electrochemistry and theoretical modeling as well as contrast catalytic tests, we identified the cobalt nodes as ORR active sites. Furthermore, when employed as a cathode electrocatalyst for zinc–air batteries, PcCu‐O 8 ‐Co delivers a maximum power density of 94 mW cm −2 , outperforming the state‐of‐the‐art Pt/C electrocatalysts (78.3 mW cm −2 ).

关键词： Elektrokatalysatoren Katalytische Zentren Metall-organische Gerüste Sauerstoffreduktionsreaktion

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Experimental evidence of crystal symmetry protection for the topological nodal line semimetal state in ZrSiS

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Physical Review B 2019年第20期100卷 205124-205124页

作者： C. C. Gu J. Hu X. L. Chen Z. P. Guo B. T. Fu Y. H. Zhou C. An Y. Zhou R. R. Zhang C. Y. Xi Q. Y. Gu C. Park H. Y. Shu W. G. Yang L. Pi Y. H. Zhang Y. G. Yao Z. R. Yang J. H. Zhou J. Sun Z. Q. Mao M. L. Tian Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei Anhui 230031 People's Republic of China Department of Physics and Engineering Physics Tulane University New Orleans Louisiana 70118 USA Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing Jiangsu 210093 People's Republic of China Key Laboratory of advanced optoelectronic quantum architecture and measurement (Ministry of Education) Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of Technology Beijing 100081 China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu 610068 China Insititute of Physical Science and Information Technology School of Physics and Materials Science Anhui University Hefei 230601 China HPCAT Geophysical Laboratory Carnegie Institution of Washington Argonne Illinois 60439 USA Center for High Pressure Science and Technology Advanced Research Shanghai 201203 People's Republic of China High Pressure Synergetic Consortium Geophysical Laboratory Carnegie Institution of Washington Argonne Illinois 60439 USA Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 People's Republic of China Department of Physics Pennsylvania State University University Park Pennsylvania 16803 USA

Tunable symmetry breaking plays a crucial role for the manipulation of topological phases of quantum matter. Here, through combined high-pressure magnetotransport measurements, Raman spectroscopy, and x-ray diffraction, we demonstrate a pressure-induced topological phase transition in nodal-line semimetal ZrSiS. Symmetry analysis and first-principles calculations suggest that this pressure-induced topological phase transition may be attributed to weak lattice distortions by nonhydrostatic compression, which breaks some crystal symmetries, such as the mirror and inversion symmetries. This finding provides some experimental evidence for crystal symmetry protection for the topological semimetal state, which is at the heart of topological relativistic fermion physics.

关键词： Pressure effects Topological materials Raman spectroscopy

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PDRs4All VIII: Mid-IR emission line inventory of the Orion Bar

arXiv

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arXiv 2024年

作者： Van De Putte, Dries Meshaka, Raphael Trahin, Boris Habart, Emilie Peeters, Els Berné, Olivier Alarcón, Felipe Canin, Amélie Chown, Ryan Schroetter, Ilane Sidhu, Ameek Boersma, Christiaan Bron, Emeric Dartois, Emmanuel Goicoechea, Javier R. Gordon, Karl D. Onaka, Takashi Tielens, Alexander G.G.M. Verstraete, Laurent Wolfire, Mark G. Abergel, Alain Bergin, Edwin A. Bernard-Salas, Jeronimo Jan, Cami Cuadrado, Sara Dicken, Daniel Elyajouri, Meriem Fuente, Asunción Joblin, Christine Khan, Baria Lacinbala, Ozan Languignon, David Le Gal, Romane Maragkoudakis, Alexandros Okada, Yoko Pasquini, Sofia Pound, Marc W. Robberto, Massimo Röllig, Markus Schefter, Bethany Schirmer, Thiébaut Tabone, Benoit Vicente, Sílvia Zannese, Marion Colgan, Sean W.J. He, Jinhua Rouillé, Gaël Togi, Aditya Aleman, Isabel Auchettl, Rebecca Baratta, Giuseppe Antonio Bejaoui, Salma Bera, Partha P. Black, John H. Boulanger, Francois Bouwman, Jordy Brandl, Bernhard Brechignac, Philippe Sandra, Brünken Buragohain, Mridusmita Burkhardt, Andrew Candian, Alessandra Cazaux, Stéphanie Cernicharo, Jose Chabot, Marin Chakraborty, Shubhadip Champion, Jason Cooke, Ilsa R. Coutens, Audrey Cox, Nick L.J. Demyk, Karine Meyer, Jennifer Donovan Foschino, Sacha García-Lario, Pedro Gerin, Maryvonne Gottlieb, Carl A. Guillard, Pierre Gusdorf, Antoine Hartigan, Patrick Herbst, Eric Hornekaer, Liv Issa, Lina Jäger, Cornelia Janot-Pacheco, Eduardo Kannavou, Olga Kaufman, Michael Kemper, Francisca Kendrew, Sarah Kirsanova, Maria S. Klaassen, Pamela Kwok, Sun Labiano, Álvaro Lai, Thomas S.-Y. Le Floch, Bertrand Le Petit, Franck Li, Aigen Linz, Hendrik Mackie, Cameron J. Madden, Suzanne C. Mascetti, Joëlle McGuire, Brett A. Merino, Pablo Micelotta, Elisabetta R. Morse, Jon A. Mulas, Giacomo Neelamkodan, Naslim Ohsawa, Ryou Omont, Alain Paladini, Roberta Palumbo, Maria Elisabetta Pathak, Amit Pendleton, Yvonne J. Petrignani, Annemieke Pino, Thomas Puga, Elena Rangwala, Naseem Rapacioli, Mathias Rho, Jeonghee Ricca, Alessandra Roman-Duval, Julia Roser, Joseph Roueff, Evelyne Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Institut d’Astrophysique Spatiale Université Paris-Saclay CNRS Bâtiment 121 Orsay91405 Cedex France LERMA Observatoire de Paris PSL Research University CNRS Sorbonne Universités MeudonF-92190 France Department of Physics & Astronomy The University of Western Ontario LondonONN6A 3K7 Canada Institute for Earth and Space Exploration The University of Western Ontario LondonONN6A 3K7 Canada Carl Sagan Center SETI Institute 339 Bernardo Avenue Suite 200 Mountain ViewCA94043 United States Institut de Recherche en Astrophysique et Planétologie Université Toulouse III - Paul Sabatier CNRS CNES 9 Av. du colonel Roche Toulouse31028 Cedex 04 France Department of Astronomy University of Michigan 1085 South University Avenue Ann ArborMI48109 United States Astronomy Department Ohio State University ColumbusOH43210 United States NASA Ames Research Center MS 245-6 Moffett FieldCA94035-1000 United States Institut des Sciences Moléculaires d’Orsay Université Paris-Saclay CNRS Bâtiment 520 Orsay91405 Cedex France Calle Serrano 121-123 Madrid28006 Spain Sterrenkundig Observatorium Universiteit Gent Gent Belgium Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Bunkyo-ku Tokyo113-0033 Japan Leiden Observatory Leiden University P.O. Box 9513 Leiden2300 RA Netherlands Astronomy Department University of Maryland College ParkMD20742 United States 10 Av. Nicolas Copernic GrasseF-06130 France INCLASS Common Laboratory. 10 Av. Nicolas Copernic Grasse06130 France UK Astronomy Technology Centre Royal Observatory Edinburgh Blackford Hill EH9 3HJ United Kingdom Ctra de Torrejón a Ajaalvir km 4 Torrejón de Ardoz28850 Spain Celestijnenlaan 200d - box 2414 Leuven3001 Belgium Université Grenoble Alpes CNRS GrenobleF-38000 France 300 Rue de la Piscine Saint-Martin d’HèresF-38406 France I. Physikalisches Institut

Context. Mid-infrared emission features are important probes for the properties of ionized gas, and hot or warm molecular gas which is difficult to probe at other wavelengths. The Orion Bar photodissociation region (PDR) is a bright, nearby, and frequently studied target containing large amounts of gas under these conditions. Under the "PDRs4All" Early Release science program for JWST, a part of the Orion Bar was observed with MIRI IFU spectroscopy, and these high-sensitivity IR spectroscopic images of very high angular resolution (0.2′′) provide a rich observational inventory of the mid-IR emission lines, while resolving the H ii region, the ionization front, and multiple dissociation fronts. Aims. We list, identify, and measure the most prominent gas emission lines in the Orion Bar, as observed by the new MIRI IFU data. An initial analysis summarizes the physical conditions of the gas and demonstrates the potential of these new data and future IFU observations with JWST. Methods. The MIRI IFU mosaic spatially resolves the substructure of the PDR, its footprint cutting perpendicularly across the ionization front and three dissociation fronts. We perform an up-to-date data reduction, and extract five spectra that represent the ionized, atomic, and molecular gas layers. We identify the observed lines through a comparison with theoretical line lists derived from atomic data and simulated PDR models. The identified species and transitions are summarized in the main table of this work, with measurements of the line intensities and central wavelengths. Results. We identified around 100 lines and report an additional 18 lines that remain unidentified. A majority consists of H i recombination lines arising from the ionized gas layer bordering the PDR. The H i line ratios are well matched by emissivity coefficients from H recombination theory, but deviate up to 10% due contamination by He i lines. We report the observed emission lines of various ionization stages of Ne, P,

关键词： Ionization of gases

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Selective Area Growth and Characterization of GaN Nanorods Fabricated by Adjusting the Hydrogen Flow Rate and Growth Temperature with Metal Organic Chemical Vapor Deposition

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Chinese Physics Letters 2016年第6期33卷 145-149页

作者：任鹏韩刚付丙磊薛斌张宁刘喆赵丽霞王军喜李晋闽 Research and Development Center for Semiconductor Lighting Chinese Academy of Sciences State Key Laboratory of Solid State Lighting Chinese Academy of Sciences Schools of Materials Science and Engineering University of Science and Technology Beijing Beijing Engineering Research Center for the 3rd Generation Semiconductor Materials and Application Chinese Academy of Sciences

CaN nanorods are successfully fabricated by adjusting the flow rate ratio of hydrogen （H2）/nitrogen （N2） and growth temperature of the selective area growth （SAG） method with metal organic chemical vapor deposition （MOCVD）. The SAG template is obtained by nanospherical-lens photolithography. It is found that increasing the flow rate of 1-12 will change the CaN crystal shape from pyramid to vertical rod, while increasing the growth temperature will reduce the diameters of GaN rods to nanometer scale. Finally the CaN nanorods with smooth lateral surface and relatively good quality are obtained under the condition that the H2：N2 ratio is 1：1 and the growth temperature is 1030℃. The good crystal quality and orientation of GaN nanorods are confirmed by high resolution transmission electron microscopy. The cathodoluminescence spectrum suggests that the crystal and optical quality is also improved with increasing the temperature.

关键词： of or is as rate GaN Selective Area Growth and Characterization of GaN Nanorods Fabricated by Adjusting the Hydrogen Flow Rate and Growth Temperature with Metal Organic Chemical Vapor Deposition by with

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Author Correction: Stretchable, dynamic covalent polymers for soft, long-lived bioresorbable electronic stimulators designed to facilitate neuromuscular regeneration

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Nature communications 2021年第1期12卷 415页

作者： Yeon Sik Choi Yuan-Yu Hsueh Jahyun Koo Quansan Yang Raudel Avila Buwei Hu Zhaoqian Xie Geumbee Lee Zheng Ning Claire Liu Yameng Xu Young Joong Lee Weikang Zhao Jun Fang Yujun Deng Seung Min Lee Abraham Vázquez-Guardado Iwona Stepien Ying Yan Joseph W Song Chad Haney Yong Suk Oh Wentai Liu Hong-Joon Yoon Anthony Banks Matthew R MacEwan Guillermo A Ameer Wilson Z Ray Yonggang Huang Tao Xie Colin K Franz Song Li John A Rogers Center for Bio-Integrated Electronics Northwestern University Evanston IL 60208 USA. Querrey Simpson Institute for Biotechnology Northwestern University Evanston IL 60208 USA. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA. Department of Bioengineering University of California Los Angeles Los Angeles CA 90095 USA. Division of Plastic and Reconstructive Surgery Department of Surgery National Cheng Kung University Hospital College of Medicine National Cheng Kung University Tainan 70456 Taiwan. International Research Center for Wound Repair and Regeneration National Cheng Kung University Tainan 70456 Taiwan. School of Biomedical Engineering Korea University Seoul 02841 Republic of Korea. Interdisciplinary Program in Precision Public Health Korea University Seoul 02841 Republic of Korea. Department of Mechanical Engineering Northwestern University Evanston IL 60208 USA. Department of Medicine University of California Los Angeles Los Angeles CA 90095 USA. State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology 116024 Dalian China. Department of Engineering Mechanics Dalian University of Technology 116024 Dalian China. International Research Center for Computational Mechanics Dalian University of Technology 116024 Dalian China. State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering Zhejiang University 310027 Hangzhou China. Department of Biomedical Engineering Northwestern University Evanston IL 60208 USA. State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University 200240 Shanghai China. Center for Developmental Therapeutics Chemistry Life Processes Institute Northwestern University Evanston IL 60208 USA. Department of Neurological Surgery Washington University School of Medicine St. Louis MO 63110 USA. Center for Advanced Molecular Imaging Northwestern University Evanston IL

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Pressure effect on the magnetic properties of the half-metallic Heusler alloy Co2TiSn

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Physical Review B 2018年第10期97卷 104414-104414页

作者： Iduru Shigeta Yutaro Fujimoto Ryutaro Ooka Yuya Nishisako Masahito Tsujikawa Rie Y. Umetsu Akiko Nomura Kunio Yubuta Yoshio Miura Takeshi Kanomata Masafumi Shirai Jun Gouchi Yoshiya Uwatoko Masahiko Hiroi Department of Physics and Astronomy Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima 890-0065 Japan Research Institute of Electrical Communication Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan Center for Spintronics Research Network Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan Electrical Engineering and Electronics Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Research Institute for Engineering and Technology Tohoku Gakuin University 1-13-1 Chuo Tagajo 985-8537 Japan Institute for Solid State Physics University of Tokyo 5-1-5 Kashiwanoha Kashiwa 277-8581 Japan

Precise magnetization measurements of a half-metallic ferromagnet Co2TiSn with the Heusler type structure have been carried out under pressure up to 1.27 GPa. At ambient pressure, the spontaneous magnetic moment Msexp and the Curie temperature TCexp are experimentally obtained to be 1.993(3)μB/f.u. and 376.76(7) K, respectively. The Msexp is independent of applying pressure. The TCexp decreases with the increase of pressure and the pressure derivative of the Curie temperature dTCexp/dp is estimated to be −3.15(9) K/GPa. Furthermore, the pressure effect on the electronic and magnetic properties of Co2TiSn has been theoretically investigated on the basis of first-principles density functional calculations by using the projector augmented wave method in order to evaluate the half metallicity of Co2TiSn. Both the experimental and the theoretical results under pressure reveal that Co2TiSn is half metal. The experimental results of pressure-dependent magnetic properties are finally discussed on the basis of the spin fluctuation theory for itinerant electron magnetism.

关键词： Ferromagnetism Spin polarization Spintronics Ferromagnets Half-metals Heusler alloy Band structure methods Crystal structures Magnetization measurements Pressure effects X-ray techniques

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Stability and conductivity of cation- and anion-substituted LiBH4-based solid-state electrolytes

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Physical Review materials 2018年第6期2卷 065402-065402页

作者： Zhenpeng Yao Soo Kim Kyle Michel Yongsheng Zhang Muratahan Aykol Chris Wolverton Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston 60208 IL United States Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge 02138 MA United States Research Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge 02139 MA United States Citrine Informatics Inc. 1741 Broadway #300 Redwood City 94063 CA United States Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Toyota Research Institute 4440 El Camino Real Palo Alto 94022 CA United States

The high-temperature phase of LiBH4 (HT-LiBH4) exhibits a promisingly high lithium ion conductivity but is unstable at room temperature. We use density functional theory (DFT) calculations to investigate the stabilization effect of halogen and alkali cation/anion substitutions on HT-LiBH4 as well the underlying mechanism for the high lithium ion conductivity. We find that increasing the substituent concentration enhances the stabilization of HT-LiBH4 (i.e., the DFT energy difference between the low- and high-temperature forms of substituted LiBH4 is reduced). Cation/anion substitution also leads to a higher Li defect (vacancy, interstitial, and Frenkel) formation energy, thereby reducing the Li defect (vacancy, interstitial, and Frenkel) concentrations. Using DFT migration barriers input into kinetic Monte Carlo simulations and the materials INTerface (MINT) framework, we calculate the room-temperature lithium ion conductivities for Li(BH4)1−xIx (x=0.25 and 0.5) and Li1−yKyBH4 (y=0.25). Our calculations suggest that the lower I concentration leads to a higher lithium ion conductivity of 5.7×10−3 S/cm compared with that of Li(BH4)0.5I0.5 (4.2×10−5 S/cm) because of the formation of more Li-related defects. Based on our findings, we suggest that the stabilization of HT-LiBH4-based lithium ion conductors can be controlled by carefully tuning the cation/anion substituent concentrations to maximize the lithium ionic conductivities of the specific system.

关键词： Ionic transport Density functional theory

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Novel type of ferroelectricity in brownmillerite structures: A first-principles study

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Physical Review materials 2018年第8期2卷 084402-084402页

作者： Hao Tian Xiao-Yu Kuang Ai-Jie Mao Yurong Yang Hongjun Xiang Changsong Xu S. Omid Sayedaghaee Jorge Íñiguez L. Bellaiche Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Physics Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Microelectronics-Photonics Program and Physics Department University of Arkansas Fayetteville Arkansas 72701 USA Materials Research and Technology Department Luxembourg Institute of Science and Technology (LIST) 5 Avenue des Hauts-Fourneaux L-4362 Esch/Alzette Luxembourg

First-principles calculations are conducted on two magnetic brownmillerites, namely, Ca2Co2O5 and Sr2Co2O5. Both systems possess a previously overlooked polar Pmc21 phase that is low in energy. This ferroelectric state is even predicted to be the ground state of Sr2Co2O5, which therefore renders such material multiferroic. Strikingly, the ferroelectricity associated with this Pmc21 phase involves an original energetic coupling that is linear in the polar mode, quadratic in another distortion, and linear in a third mode. Such ferroelectricity is therefore of a novel type, since it differs from previously reported proper, improper, hybrid improper, and triggered kinds of ferroelectricity.

关键词： Defects Ferroelectricity First-principles calculations Crystal structures Multiferroics Oxides Density functional theory

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Bismuth nanosheets as a Q-switcher for a mid-infrared erbium-doped SrF_2 laser

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Photonics research 2018年第8期6卷 I0016-I0016,763-767页

作者： JINGJING LIU HAO HUANG FENG ZHANG ZHEN ZHANG JIE LIU HAN ZHANG LIANGBI SU Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal University SZU-NUS Collaborative Innovation Centre for Optoelectronic Science & Technology and Key Laboratory of Optoelectronic Devices and Systems of the Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University CAS Key Laboratory of Transparent and Opto-Functional Inorganic Materials Synthetic Single Crystal Research Center Shanghai Institute of Ceramics Chinese Academy of Sciences Institute of Data Science and Technology Shandong Normal University State Key Laboratory of High Performance Ceramics and Superfine Microstructure Chinese Academy of Sciences Shanghai Institute of Ceramics

Bismuth nanosheets(Bi-NSs) were successfully prepared and employed as saturable absorbers to generate a diodepumped dual-wavelength Er^(3+):SrF_2 laser in the mid-infrared region. Q-switched pulses with a maximum output power of 0.226 W were obtained at an absorbed pump power of 1.97 W. A repetition rate of 56.20 kHz and a minimum pulse duration of 980 ns were achieved. To the best of our knowledge, we present the first application of Bi-NSs in a mid-infrared all-solid-state laser. The results prove that Bi-NSs may be applied as an optical modulator in mid-infrared photonic devices or as a mode-locker and Q-switcher.

关键词：激光器铋纳米片吸收体通讯技术

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