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Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

Light(Science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr S.Slavich georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov Olga G.Matveeva dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.Syuy dmitry M.Tsymbarenko Mikhail S.Mironov Sergey M.Novikov Ivan Kruglov davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin Valentyn S.Volkov Kostya S.Novoselov Moscow Center for Advanced Studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. donostia International Physics Center(dIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. department of Materials Science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and *** success inspired an intensive search for the highest possible anisotropic properties among vdW ***,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative ***,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical *** our approach,we found As2S3 as a highly anisotropic vdW *** demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by *** these benefits,As2S3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase ***,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

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New luminescent 10-oxybenzoquinolate complexes of rare earth metals

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Journal of Rare Earths 2023年第8期41卷 1135-1143,I0001页

作者： Tatyana V.Balashova Svetlana K.Polyakova Vasily A.Ilichev Andrey A.Kukinov Roman V.Rumyantcev georgy K.Fukin Ivan d.Grishin Artem N.Yablonskiy Alexander F.Shestakov Mikhail N.Bochkarev G.A.Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street49603950Nizhny NovgorodRussian Federation Nizhny Novgorod State University Gagarina Avenue 23/2603950Nizhny NovgorodRussian Federation Institute for Physics of Microstructures of Russian Academy of Sciences Akademicheskaya Street 7603950Nizhny NovgorodRussian Federation Institute of Problems of Chemical Physics of Russian Academy of Sciences Academician Semenov Avenue1ChernogolovkaMoscow Region142432Russian Federation

A series of Sc,Y,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Ho,Er,Tm and Yb complexes with oxybenzoquinoline ligands(BQ) was synthesized by the reactions of 10-hydroxybenzo[h]quinoline with cyclopentadienides or tris(trimethylsilyl)amides of rare earth *** structure,as well as the photo-and electroluminescent(PL,EL) properties of these complexes in solutions and solid state were *** solutions,complexes of sodium and lanthanides exhibit double peaked ligand-centered PL of enol and keto forms of BQ with a quantum yield of 1%-8%.In the solid state the complexes of Sm,Eu,Ho,Nd,Er,and Yb along with the ligand-centered PL also exhibit a moderate-intensity metal-centered PL which is characteristic of the corresponding Ln^(3+) ***(BQ)_(3) complex shows bright green EL which has intensity comparable to the best results observed for scandium complexes with other organic ligands.

关键词： Lanthanides Photoluminescence(PL) Electroluminescence(EL) 10-hydroxybenzo[h]quinoline X-ray structure Organic light-emitting diodes(OLEds)

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Comparison of pulse-modulated and continuous operation modes of a radio-frequency inductive ion source

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Plasma Science and Technology 2023年第2期25卷 131-145页

作者： Ilya ZAdIRIEV Elena KRALKINA Konstantin VAVILIN Alexander NIKONOV georgy SHVIdKIY Physical Electronics department Faculty of PhysicsLomonosov Moscow State UniversityMoscow 119991Russia

The paper describes an experimental study of the characteristics of a pulse-modulated radiofrequency(RF)discharge sustained at low pressures,typical of the operating modes of RF gridded ion *** motivation for the study is the question of whether the RF pulsemodulated mode can increase the efficiency of the ion *** ion current values extracted from an RF inductive ion source operating in continuous and pulse-modulated modes were *** experimental data were also compared with the parameter calculations based on a0d numerical model of the *** measurements showed that the pulse-modulated operation mode of the RF ion source had a noticeable advantage when the power of the RF generator was 140 W or ***,as the generator power increased,the advantage was lost because the pulse-modulated operation mode,having a higher RF power instant value,entered the region of existence sooner than the continuous mode,where the ion production cost begins to grow with RF power.

关键词： discharge plasma radio frequency(RF) pulse electrons ions

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Monophthalocyanine complexes of samarium and terbium with axial ligands:synthesis, structure and optoelectronic properties

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Journal of Rare Earths 2014年第12期32卷 1101-1108页

作者： Alexander A.Maleev Anatoly P.Pushkarev Vasily A.Ilichev Mikhail A.Lopatin Maxim A.Samsonov georgy K.Fukin georgy L.Pakhomov Vladislav V.Travkin Ivan d.Grishin Mikhail N.Bochkarev G.A.Razuvaev Institute of Organometallic Chemistry Russian Academy of Sciences Tropinina str.49 603950 Nizhny Novgorod Russia department of Organic Chemistry Nizhny Novgorod State University 23 Gagarin Avenue 603950 Nizhny Novgorod Russia Institute for Physics of Microstructures Russian Academy of Sciences 7 ul.Akademicheskaya 603950 Nizhny Novgorod Russia

The monophthalocyanine complexes of samarium and terbium containing axial 2-mercaptobenzothiazole（Pc Sm（MBT）（1））, 2-（2-benzoxazol-2-yl） phenolate（Pc Tb（OON）（2）） or 2-（2-benzothiazol-2-yl）phenolate（Pc Tb（SON）（3）） ligands were synthesized and identified by elemental, LdI-TOF and X-ray（for 1） ***（PL） and electroluminescence（EL） spectra of the compounds contained only emission bands of phthalocyanine and axial ligands but did not contain the bands of f-f *** was found that among the complexes 1, 2, 3 the latter had highest photoconductivity（~10–7 S/cm） and photovoltaic *** organic photovoltaic device（OPV） of configuration of ITO/3/C60/Alq3/Al revealed open-circuit voltage（VOC） of 0.24 V and short current density（ISC） of 0.3 μA/cm2 under illumination by a xenon lamp at 17 m W/cm2.

关键词： phthalocyanine samarium terbium luminescence photovoltaic OLEd rare earths

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Optimized Filling of a Given Cuboid with Spherical Powders for Additive Manufacturing

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Journal of the Operations Research Society of China 2021年第4期9卷 853-868页

作者： Zoya duriagina Igor Lemishka Igor Litvinchev Jose Antonio Marmolejo Alexander Pankratov Tatiana Romanova georgy Yaskov Lviv Polytechnic National University Lviv 79013Ukraine Katolicki Uniwersytet Lubelski Jana Pawła II Al.Racławickie 1420950 LublinPoland Graduate Program in Systems Engineering Nuevo Leon State University(UANL)MonterreyCP 66455 San Nicolas de los GarzaNuevo LeonMexico Engineering department Panamerican UniversityCP 03920 Mexico CityMexico department of Mathematical Modeling and Optimal design Institute for Mechanical Engineering Problemsthe National Academy of Sciences of UkraineKharkiv 61046Ukraine department of Systems Engineering of Kharkiv National University of Radio Electronics Kharkiv 61166Ukraine

In additive manufacturing(also known as 3d printing),a layer-by-layer buildup process is used for manufacturing *** laser 3d printers can work with various materials including metal *** particular,mixing various-sized spherical powders of titanium alloys is considered most promising for the aerospace *** achieve desired mechanical properties of the final product,it is necessary to maintain a certain proportional ratio between different powder *** this paper,a modeling approach for filling up a rectangular 3d volume by unequal spheres in a layer-by-layer manner is proposed.A relative number of spheres of a given radius(relative frequency)are known and have to be fulfilled in the final packing.A fast heuristic has been developed to solve this special packing *** results are compared with experimental findings for titanium alloy spherical *** relative frequencies obtained by using the imposed algorithm are very close to those obtained by the *** provides an opportunity for using a cheap numerical modeling instead of expensive experimental study.

关键词： Sphere packing Heuristic algorithm Titanium alloy spherical powders 3d printing

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Milliwatt terahertz harmonic generation from topological insulator metamaterials

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Light(Science & Applications) 2022年第11期11卷 2766-2773页

作者： Klaas-Jan Tielrooij Alessandro Principi david Saleta Reig Alexander Block Sebin Varghese Steffen Schreyeck Karl Brunner Grzegorz Karczewski Igor Ilyakov Oleksiy Ponomaryov Thales V.A.G.de Oliveira Min Chen Jan-Christoph deinert Carmen Gomez Carbonell Sergio O.Valenzuela Laurens W.Molenkamp Tobias Kiessling georgy V.Astakhov Sergey Kovalev Catalan Institute of Nanoscience and Nanotechnology(ICN2) BIST and CSICCampus UABBellaterraBarcelona 08193Spain department of Applied Physics TU EindhovenDen Dolech 25612 AZ EindhovenThe Netherlands School of Physics and Astronomy University of ManchesterM139PL ManchesterUK Physikalisches Institut(EP3) Universitat WurzburgAm Hubland97074 WurzburgGermany Institute of Physics Polish Academy of ScienceAl.Lotnikow 32/46PL-02668 WarsawPoland Helmholtz Zentrum dresden-Rossendorf Bautzner Landstr.40001328 DresdenGermany ICREA Pg.Lluis Companys 2308010 BarcelonaSpain Institute for Topological Insulators Am HublandD-97074 WurzburgGermany

Achieving effcient,high-power harmonic generation in the terahertz spectral domain has technological applications,for example,in sixth generation(6G)communication *** dirac fermions possess extremely large terahertz nonlinear susceptibilities and harmonic conversion ***,the observed maximum generated harmonic power is limited,because of saturation effects at increasing incident powers,as shown recently for ***,we demonstrate room-temperature terahertz harmonic generation in a Bi_(2)Se_(3) topological insulator and topological-insulator-grating metamaterial structures with surface-selective terahertz field *** obtain a third-harmonic power approaching the miliwatt range for an incident power of 75 mW-an improvement by two orders of magnitude compared to a benchmarked graphene *** establish a framework in which this exceptional performance is the result of thermodynamic harmonic generation by the massless topological surface states,benefiting from ultrafast dissipation of electronic heat via surface-bulk Coulomb *** results are an important step towards on-chip terahertz(opto)electronic applications.

关键词： harmonic insulator incident

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Experimental and petrological constraints on local-scale interaction of biotite-amphibole gneiss with H_2O-CO_2-(K,Na) Cl fluids at middle-crustal conditions:Example from the Limpopo Complex,South Africa

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Geoscience Frontiers 2012年第6期3卷 829-841页

作者： Oleg G.Safonov Elizaveta I.Kovaleva Svetlana A.Kosova H.M.Rajesh georgy A.Belyanin Maria A.Golunova dirk d.Van Reenen Institute of Experimental Mineralogy RAS ChernogolovkaMoscow Region 142432.Russia department of Petrology.Moscow State University Moscow 119899Russia department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006JohannesburgSouth Africa Labor fur Geochronologie Department fur LithospharenforschungUniversitat WienAlthanstrasse 14A-1090 ViennaAustria Institute of Experimental Mineralogy RAS ChernogolovkaMoscow Region 142432Russia department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006Johannesburg.South Africa

Reaction textures and fluid inclusions in the -2.0 Ga pyroxene-bearing dehydration zones within the Sand River biotite-hornblende orthogneisses （Central Zone of the Limpopo Complex） suggest that the formation of these zones is a result of close interplay between dehydration process along ductile shear zones triggered by H2O-CO2-salt fluids at 750--800 ℃ and 5.5--6.2 kbar, partial melting, and later exsolution of residual brine and H2O-CO2 fluids during melt crystallization at 650--700 ℃. These processes caused local variations of water and alkali activity in the fluids, resulting in various mineral assemblages within the dehydration zone. The petrological observations are substantiated by experiments on the interaction of the Sand River gneiss with the H2O-CO2-（K, Na）Cl fluids at 750 and 800 ℃ and 5.5 kbar. It follows that the interaction of biotite-amphibole gneiss with H2O-CO2-（K, Na）CI fluids is accompanied by partial melting at 750--800 ℃. Orthopyroxene-bearing assemblages are characteristic for temperature 800 ℃ and are stable in equilibrium with fluids with low salt concentrations, while salt-rich fluids produce clinopyroxene-bearing assemblages. These observations are in good agreement with the petrological data on the dehydration zones within the Sand River olthogneisses.

关键词： Charnockite Fluid-rock interaction CO2-rich fluids NaCl-KCl brines Partial melting Experimental petrology

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A diffusion-weighted imaging based diagnostic system for early detection of prostate cancer

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Journal of Biomedical Science and Engineering 2013年第3期6卷 346-356页

作者： Ahmad Firjani Ahmed Elnakib Fahmi Khalifa georgy Gimel’farb Mohamed Abou El-Ghar Adel Elmaghraby Ayman El-Baz BioImaging Laboratory Bioengineering Department University of Louisville Louisville USA department of Computer Engineering and Computer Science University of Louisville Louisville USA department of Computer Science University of Auckland Auckland New Zealand Radiology department Urology and Nephrology Center University of Mansoura Mansoura Egypt

A new framework for early diagnosis of prostate cancer using diffusion-Weighted Imaging (dWI) is proposed. The proposed diagnostic approach consists of the following four steps to detect locations that are suspicious for prostate cancer: 1) In the first step, we isolate the prostate from the surrounding anatomical structures based on a Maximum A Posteriori (MAP) estimate of a new log-likelihood function that accounts for the shape priori, the spatial interaction, and the current appearance of prostate tissues and its background (surrounding anatomical structures);2) In order to take into account any local deformation between the segmented prostates at different b-values that could occur during the scanning process due to local motion, a non-rigid registration algorithm is employed;3) A KNN-based classifier is used to classify the prostate into benign or malignant based on three appearance features extracted from registered images;and 4) The tumor boundaries are determined using a level set deformable model controlled by the diffusion information and the spatial interactions between the prostate voxels. Preliminary experiments on 28 patients (17 malignant and 11 benign) resulted in 100% correct classification, showing that the proposed method is a promising supplement to current technologies (biopsy-based diagnostic systems) for the early diagnosis of prostate cancer.

关键词： Prostate Cancer 3d Markov-Gibbs Random Field Nonrigid Registration diffusion-Weighted Imaging

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Spectroscopy of individual bipolar molecular heterojunctions using scanning tunneling microscopy

Spectroscopy of individual bipolar molecular heterojunctions...

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第18届国际真空大会

作者： Ryan Yamachika daniel Wegner Yasaman Bahri georgy Samsonidze Marvin L. Cohen Steven G. Louie T. don Tilley Rachel A. Segalman Michael F. Crommie department of Physics University of California at BerkeleyMaterials Science DivisionLawrence Berkeley National Laboratory Chemical Science division Lawrence Berkeley National Laboratory department of Chemical Engineering University of California at Berkeley Department of ChemistryUniversity of California at Berkeley

Bipolar molecules incorporating donor and acceptor components within a single molecule provide new device opportunities due to their intrinsic behavior as nanoscale p-n heterojunctions. The suitability of such molecules for photovoltaic applications depends on many factors, including the energy and spatial distribution of molecular orbitals, the influence of environment, how the molecules are assembled, and optical excitation response. Here we report a direct characterization of the local electronic structure of the bipolar molecule bithiophene naphthalene diimide （BNd）. Using scanning tunneling spectroscopy, we were able to study the internal electronic structure of individual BNd molecules on a thin insulating layer of NaCl. We find that BNd molecules exhibit type II heterojunction behavior with orbital energy shifts occurring over subnanometer intramolecular interface distances. At higher coverage on metal substrates BNd molecules with different bridge structures self-assemble into 1-d molecular chains. Our experimental results can be understood through the use of first-principle theoretical modeling, and provide new insights into how these molecular systems might be optimized.

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Sub-percent precision measurement of neutrino oscillation parameters with JUNO

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Chinese Physics C 2022年第12期46卷 28-49页

作者： Angel Abusleme Thomas Adam Shakeel Ahmad Rizwan Ahmed Sebastiano Aiello Muhammad Akram Abid Aleem 安丰鹏安琪 Giuseppe Andronico Nikolay Anfimov Vito Antonelli Tatiana Antoshkina Burin Asavapibhop João Pedro Athayde Marcondes de André didier Auguste 白伟东 Nikita Balashov Wander Baldini Andrea Barresi davide Basilico Eric Baussan Marco Bellato Antonio Bergnoli Thilo Birkenfeld Sylvie Blin david Blum Simon Blyth Anastasia Bolshakova Mathieu Bongrand Clément Bordereau dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano Jose Busto Ilya Butorov Anatael Cabrera Barbara Caccianiga 蔡浩蔡啸蔡严克蔡志岩 Riccardo Callegari Antonio Cammi Agustin Campeny 曹传亚曹国富曹俊 Rossella Caruso Cédric Cerna Chi Chan 常劲帆 Yun Chang 陈国明陈平平 Po-An Chen 陈少敏 Xurong Chen 陈义学陈羽陈志源陈梓康程捷程雅苹 Yu Chin Cheng Alexey Chetverikov davide Chiesa Pietro Chimenti Artem Chukanov Gérard Claverie Catia Clementi Barbara Clerbaux Selma Conforti di Lorenzo daniele Corti Flavio dal Corso Olivia dalager Christophe de La Taille 邓智邓子艳 Wilfried depnering Marco diaz Xuefeng ding 丁雅韵 Bayu dirgantara Sergey dmitrievsky Tadeas dohnal dmitry dolzhikov georgy d.nchenko 董建蒙 Evgeny doroshkevich Marcos dracos Frédéric druillole 杜然杜书先 Stefano dusini Martin dvorak Timo Enqvist Heike Enzmann Andrea Fabbri donghua Fan 樊磊方建方文兴 Marco Fargetta dmitry Fedoseev 费政勇 Li-Cheng Feng 冯启春 Richard Ford Amélie Fournier 甘浩男高峰 Alberto Garfagnini Arsenii Gavrikov Marco Giammarchi Nunzio Giudice Maxim Gonchar 龚光华宫辉 Yuri Gornushkin Alexandre Göttel Marco Grassi Vasily Gromov 顾旻皓谷肖飞古宇关梦云管宇铎 Nunzio Guardone 郭聪郭竞渊郭万磊 Xinheng Guo 郭宇航 Paul Hackspacher Caren Hagner 韩然 Yang Han 何苗 Wei He Tobias Heinz Patrick Hellmuth 衡月昆 Rafael Herrera 贺远强侯少静 Yee Hsiung Bei-Zhen Hu 胡航 Jianrun Hu 胡俊胡守扬胡涛胡宇翔胡焯钧黄桂鸿黄翰雄黄凯旋黄文昊 Xin Huang 黄性涛黄永波惠加琪霍雷霍文驹 Cédric Huss Safeer Hussain Ara Ioannisian Roberto Isocrate Beatrice Jelmini Ignacio Jeria 季筱璐贾慧慧贾俊基蹇司玉蒋荻蒋炜江晓山荆小平 Cécile Jollet Jari Joutsenvaara Leonidas Kalousis Philipp Kampmann 康丽 Rebin Karaparambil Narine Kazarian Amina Khatun Yerevan Physics Institute YerevanArmenia UniversiéLibre de Bruxelles BrusselsBelgium Universidade Estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro Rio de JaneiroBrazil Pontificia Universidad Católica de Chile SantiagoChile Universidad Tecnica Federico Santa Maria ValparaisoChile Beijing Institute of Spacecraft Environment Engineering BeijingChina Beijing Normal University BeijingChina China Institute of Atomic Energy BeijingChina Institute of High Energy Physics BeijingChina North China Electric Power University BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua University BeijingChina University of Chinese Academy of Sciences BeijingChina Jilin University ChangchunChina College of Electronic Science and Engineering National University of Defense TechnologyChangshaChina Chongqing University ChongqingChina dongguan University of Technology DongguanChina Jinan University GuangzhouChina Sun Yat-Sen University GuangzhouChina Harbin Institute of Technology HarbinChina University of Science and Technology of China HefeiChina The Radiochemistry and Nuclear Chemistry Group in University of South China HengyangChina Wuyi University JiangmenChina Shandong University JinanChinaand Key Laboratory of Particle Physics and Particle Irradiation of Ministry of EducationShandong UniversityQingdaoChina Institute of Modern Physics Chinese Academy of SciencesLanzhouChina Nanjing University NanjingChina Guangxi University NanningChina East China University of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai University TianjinChina Wuhan University WuhanChina Xi'an Jiaotong University Xi'anChina Xiamen University XiamenChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhou

JUNO is a multi-purpose neutrino observatory under construction in the south of *** publication presents new sensitivity estimates for the measurement of the △m_(31)^(2),△m_(21)^(2),sin^(2)θ_(12),and sin^(2)θ_(13) oscillation parameters using reactor antineutrinos,which is one of the primary physics goals of the *** sensitivities are obtained using the best knowledge available to date on the location and overburden of the experimental site,the nuclear reactors in the surrounding area and beyond,the detector response uncertainties,and the reactor antineutrino spectral shape constraints expected from the TAO satellite *** is found that the △m_(21)^(2) and sin^(2)θ_(12) oscillation parameters will be determined to 0.5%precision or better in six years of data *** the same period,the △m_(31)^(2) parameter will be determined to about 0.2%precision for each mass ordering *** new precision represents approximately an order of magnitude improvement over existing constraints for these three parameters.

关键词： neutrino oscillation reactor antineutrino precision measurement JUNO

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