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Search for the doubly heavy baryons Ω^(0)_(bc) and E^(0)_(bc) decaying to Λ^(+)_(c)π^(-) and E^(+)_(c)π^(-)

Chinese physics C 2021年第9期45卷 10-21页

作者： R.Aaij C.Abelian Beteta T.Ackernley B.Adeva M.Adinolfi H.Afshamia C.A.Aidala S.Aiola Z.Ajaltouni S.Aka J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelie S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Beminghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.Bjorn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Camiti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek P.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Ambrosi Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy physics Tsinghua UniversityBeijingChina institute of High Energy physics(IHEP) BeijingChina School of physics State Key laboratory of Nuclear physics and Technology Peking UniversityBeijingChina University ofChinese Academy of Sciences BeijingChina institute of Particle physics Central China Normal UniversityWuhanHubeiChina Univ.Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universite Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/FN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kemphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef national institute for Subatomic physics AmsterdamNetherlands Nikhef national institute for Subatomic physics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer ScienceKr

The first search for the doubly heavyΩ^(0)_(bc)baryon and a search for the E^(0)_(bc)baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb^(-1).The baryons are reconstructed via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c^(2),in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/*** limits are set on the ratio of the Ω^(0)_(bc)and E^(0)_(bc)production cross-section times the branching fraction to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relative to that of the Λ^(0)_(b)(E^(0)_(b))baryon,for different lifetime hypotheses,at 95%confidence *** upper limits range from 0.5 x 10^(-4)to 2.5 x 10^(-4)for theΩ^(0)_(bc)→Λ^(+)_(c)π^(-)(E^(0)_(bc)→Λ^(+)_(c)π^(-))decay,and from 1.4x 10^(-3)to 6.9 x 10^(-3)for theΩ^(0)_(bc)→E^(+)_(c)π^(-)(E^(0)_(bc)→E^(+)_(c)π^(-))decay,depending on the considered mass and lifetime of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B physics quarkonium spectroscopy heavy quark production

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Measurements of the center-of-mass energies of e^(+)e^(-)collisions at BESIII

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Chinese physics C 2021年第10期45卷 7-15页

作者： M.Ablikim M.N.Achasov P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An Q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi J.Bloms A.Bortone I.Boyko R.A.Briere H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Chang W.L.Chang G.Chelkov D.Y.Chen G.Chen H.S.Chen M.L.Chen S.J.Chen X.R.Chen Y.B.Chen Z.J.Chen W.S.Cheng G.Cibinetto F.Cossio X.F.Cui H.L.Dai X.C.Dai A.Dbeyssi R.E.de Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding C.Dong J.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du Y.L.Fan J.Fang S.S.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.H.Feng M.Fritsch C.D.Fu Y.Gao Y.Gao Y.Gao Y.G.Gao I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco L.M.Gu M.H.Gu Y.T.Gu C.Y Guan A.Q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.Q.Hao F.A.Harris K.L.He F.H.Heinsius C.H.Heinz T.Held Y.K.Heng C.Herold M.Himmelreich T.Holtmann G.Y.Hou Y.R.Hou Z.L.Hou H.M.Hu J.F.Hu T.Hu Y.Hu G.S.Huang L.Q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain N Husken W.Ikegami Andersson W.Imoehl M.Irshad S.Jaeger S.Janchiv Q.Ji Q.P.Ji X.B.Ji X.L.Ji Y.Y.Ji H.B.Jiang X.S.Jiang J.B.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing T.Johansson N.Kalantar-Nayestanaki X.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc M.G.Kurth W.Kuhn J.J.Lane J.S.Lange P.Larin A.Lavania L.Lavezzi Z.H.Lei H.Leithoff M.Lellmann T.Lenz C.Li C.H.Li Cheng Li D.M.Li F.Li G.Li H.Li H.Li H.B.Li H.J.Li J.L.Li J.Q.Li J.S.Li Ke Li L.K.Li Lei Li P.R.Li S.Y.Li W.D.Li W.G.Li X.H.Li X.L.Li Xiaoyu Li Z.Y.Li H.Liang H.Liang H.Liang Y.F.Liang Y.T.Liang G.R.Liao 廖龙洲 J.Libby C.X.Lin B.J.Liu C.X.Liu D.Liu F.H.Liu Fang Liu Feng Liu H.B.Liu H.M.Liu Huanhuan Liu Huihui Liu J.B.Liu J.L.Liu J.Y.Liu K.Liu K.Y.Liu L.Liu M.H.Liu P.L.Liu Q.Liu Q.Liu S.B.Liu Shuai Liu T.Liu W.M.Liu X.Liu Y.Liu Y.B.Liu Z.A.Liu Z.Q.Liu X.C.Lou F.X.Lu H.J.Lu J.D.Lu J.G.Lu X.L.Lu Y.Lu Y.P.Lu C.L.Luo M.X.Luo institute of High Energy physics Beijing 100049China Beihang University Beijing 100191China beijing institute of Petrochemical Technology Beijing 102617China Bochum Ruhr-University D-44780 BochumGermany Carnegie Mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China China Center of Advanced Science and Technology Beijing 100190China COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200443China G.I.Budker institute of Nuclear physics SB RAS(BINP) Novosibirsk 630090Russia GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Helmholtz institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University of Science and Technology Luoyang 471003China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian institute of Technology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali di Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione di Ferrara University of FerraraI-44122FerraraItaly 25Institute of Modern PhysicsLanzhou 730000China institute of Modern physics Lanzhou 730000China institute of physics and Technology Peace Ave.54BUlaanbaatar 13330Mongolia Jilin University Changchun 130012China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany Joint institute for Nuclear Research 141980 DubnaMoscow regionRussia Justus-Liebig-Universitaet Giessen II.Physikali

During the 2016-17 and 2018-19 running periods,the BESIII experiment collected 7.5 fb of e^(+)e^(-)collision data at center-of-mass energies ranging from 4.13 to 4.44 *** data samples are primarily used for the study of excited charmonium and charmoniumlike *** analyzing the di-muon process e^(+)e^(-)→(γISR=FSR)μ^(+)μ^(-),we measure the center-of-mass energies of the data samples with a precision of 0.6 *** a run-by-run study,we find that the center-of-mass energies were stable throughout most of the data-collection period.

关键词： center-of-mass energy e^(+)e^(-) annihilation BESIII

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THE LIGHT INDUCED CHANGE IN TRANSIENT PHOTOCONDUC-TIVITY OF POLYMORPHOUS SILICON FILMS

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 453-456页

作者： S.B. Zhang, G.L. Kong, Y. Y. Xu, Y.Q. Wang, H.W. Diao and X.B. Liao (State laboratory for Surface physics, institute of Semiconductors & Center for condensed matter physics, Chinese Academy of Sciences, beijing 100083, China) Inst. of Semiconduct. Chinese Acad. of Sci. Beijing 100083 China

The decays of transient photoconductivity and their light-induced changes of polymorphous silicon (pm-Si:H) films were investigated. The decays can be fit fairly well by a sum of two exponential decay functions, which indicates that there are two kinds of traps contributing to the process. The light-induced changes of the concentration and energy level of the traps were estimated. The results show that the light-induced changes in trap energy position Et, trap concentration Nt as well as photoconductivity are markedly less for pm-Si:H than that for a-Si:H.

关键词： light-induced change transient film

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Transformation of Hexagonal Lu to Cubic LuH_(2+x)Single-Crystalline Films

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Chinese physics Letters 2023年第8期40卷 99-102页

作者：李沛怡毕佳畅张顺达蔡瑞苏冠华綦福刚张如意魏志阳曹彦伟 School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Ningbo institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

With the recent report of near ambient superconductivity at room temperature in the N-doped lutetium hydride(Lu-H-N)system,the understanding of cubic Lu-H compounds has attracted worldwide ***,compared to polycrystals with non-negligible impurities,the single-crystalline form of materials with high purity can provide an opportunity to show their hidden ***,the experimental synthesis of single-crystalline cubic Lu-H compounds has not been reported so ***,we develop an easy way to synthesize highly pure LuH_(2+x)single-crystalline films by the post-annealing of Lu single-crystalline films(purity of 99.99%)in H_(2)*** crystal and electronic structures of films were characterized by x-ray diffraction,Raman spectroscopy,and electrical ***,Lu films are silver-white and metallic,whereas their transformed LuH_(2+x)films become purple-red and insulating,indicating the possible formation of an unreported electronic state of Lu-H *** work provides a novel route to synthesize and explore more singlecrystalline Lu-H compounds.

关键词： crystalline purity cubic

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高压纳米X射线成像技术的应用

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Engineering 2019年第3期 276-298页

作者：毛立文林昱刘宜晋刘锦 Department of Geological Sciences Stanford University Stanford institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory

纳米级透射X射线显微镜(nanoscale transmission X-ray microscopy, nanoTXM)与金刚石对顶砧(diamond anvil cell, DAC)的结合,具有在极端条件下对材料进行高分辨率、非破坏性三维成像的巨大潜能。在本文中,我们讨论了当前高分辨率X射... 详细信息

纳米级透射X射线显微镜(nanoscale transmission X-ray microscopy, nanoTXM)与金刚石对顶砧(diamond anvil cell, DAC)的结合,具有在极端条件下对材料进行高分辨率、非破坏性三维成像的巨大潜能。在本文中,我们讨论了当前高分辨率X射线成像的发展状况及其在第三代同步加速器X射线源中基于DAC的高压nanoTXM实验中的应用,包括为成功测量所需要的技术方面的考虑。接下来,展示了一些近期的原位高压测量结果,这些测量研究了无定形或低结晶材料的状态方程(equations of state, EOS)以及压力诱导的相变和电子变化。这些结果表明从凝聚态物理和固态化学到材料科学和行星内部研究,nanoTXM技术在广泛的研究领域中具有应用潜力。最后,对于这项振奋人心的技术,我们讨论了它的未来发展方向以及提高其在高压科学中更宽泛适用性的机遇。

关键词： X射线成像高压金刚石对顶砧

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High Dynamic Pressures and Modest Temperatures: A Broad Perspective and Bridging the Gap

High Dynamic Pressures and Modest Temperatures: A Broad Pers...

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18th International Conference on High Pressure Science and Technology

作者： William J.Nellis Lawrence Livermore national laboratory Livermore CA 94550 U.S.A

＜正＞Dynamic experiments performed with a two-stage light-gas gun achieve pressures up to -400 GPa （4 Mbar） and temperatures as high as Several 1000 K. These extreme conditions produce highly condensed matter, achieve states comparable to those in the deep interiors of giant planets, and potentially can synthesize new materials. Results for a wide range of systems will be reviewed, including dense molecular and planetary fluids, carbon, geological solids, and materials whose properties at ambient are altered by being subjected to high dynamic pressures. Fluid hydrogen will be discussed in terms of a nonmetal-metal transition achieved by reducing the mobility gap with pressure and filling it in with fluid and thermal disorder until at 140 GPa and -3000 K the mobility gap is smeared out. At this point this disordered system has a Fermi surface and the minimum conductivity of a strong-scattering metal. Work performed under the auspices of U.S. Department of Energy by the University of California Lawrence Livermore national laboratory under Contract No. W-7405-ENG-48.

关键词： High Pressure

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Mapping nighttime PM2.5 from VIIRS DNB using a linear mixed effects model

Mapping nighttime PM2.5 from VIIRS DNB using a linear mixed ...

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第十三届全国气溶胶会议

作者： D.Fu X.Xia M.Duan X.Zhang X.Li J.Wang LAGEO Institute of Atmospheric PhysicsChinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&Technology School of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu University of Information Technology national Satellite Meteorological Center China Meteorological Administration Department of Chemical and Biochemical Engineering Center for Global and Regional Environmental Studiesand Informatics InitiativeThe University of Iowa

Estimation of particulate matter with aerodynamic diameter less than 2.5 μm(PM) from daytime satellite aerosol products is widely reported in the literature, however, remote sensing nighttime PM from space is very *** shows a distinct diurnal cycle and PM concentration at 1:00 local standard time(LST) has a linear correlation coefficient(R) of 0.80 with daily-mean ***, estimation of nighttime PM is required for fully understanding of temporal variation of PM and its effects on air *** data from the Day/Night Band(DNB) of the Visible Infrared Imaging Radiometer Suite(VIIRS) and hourly PM data at 35 stations in beijing, a mixed effects model has been developed to estimate nighttime PM from nighttime light radiance measurements based on the assumption that the DNB-PM relationship is constant spatially but varies ***-validation showed that the model developed using all stations could predict PM with mean determination coefficient(R) of 0.87± 0.12, 0.83±0.10, 0.87± 0.09, 0.83± 0.10 in spring, summer, autumn and *** analysis showed that the best model performance was achieved in urban stations with average crossvalidation R of *** rural stations, DNB light signal was likely contaminated by lunar illuminance that resulted in relatively poor estimation of *** fixed and random parameters of the mixed effects model in urban stations differed from those in suburban stations, which indicated that the assumption of the mixed effects model should be carefully evaluated when the method was used at a regional scale.

关键词： VIIRS/DNB the mixed effects model nighttime PM 2.5

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A Bifunctional-Modulated Conformal Li/Mn-Rich Layered Cathode for Fast-Charging,High Volumetric Density and Durable Li-Ion Full Cells

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Nano-Micro Letters 2021年第8期13卷 40-55页

作者： Zedong Zhao Minqiang Sun Tianqi Wu Jiajia Zhang Peng Wang Long Zhang Chongyang Yang Chengxin Peng Hongbin Lu State Key laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceCollaborative Innovation Center of Polymers and Polymer CompositesFudan University2005 Songhu RoadShanghai 200438People’s Republic of China School of Materials Science&Engineering University of Shanghai for Science and TechnologyShanghai 200093People’s Republic of China national Engineering Research Center for Supercapacitor for Vehicles Shanghai Aowei Technology Development Co.LtdShanghai 201203People’s Republic of China Key laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071People’s Republic of China

Lithium-and manganese-rich(LMR)layered cathode materials hold the great promise in designing the next-generation high energy density lithium ion ***,due to the severe surface phase transformation and structure collapse,stabilizing LMR to suppress capacity fade has been a critical ***,a bifunctional strategy that integrates the advantages of surface modification and structural design is proposed to address the above issues.A model compound Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(MNC)with semi-hollow microsphere structure is synthesized,of which the surface is modified by surface-treated layer and graphene/car-bon nanotube dual *** unique structure design enabled high tap density(2.1 g cm^(−3))and bidirectional ion diffusion *** dual surface coatings covalent bonded with MNC via C-O-M linkage greatly improves charge transfer efficiency and mitigates electrode *** to the synergistic effect,the obtained MNC cathode is highly conformal with durable structure integrity,exhibiting high volumetric energy density(2234 Wh L^(−1))and predominant capacitive *** assembled full cell,with nanograph-ite as the anode,reveals an energy density of 526.5 Wh kg^(−1),good rate performance(70.3%retention at 20 C)and long cycle life(1000 cycles).The strategy presented in this work may shed light on designing other high-performance energy devices.

关键词： Lithium-and manganese-rich layered cathode Semi-hollow microspheres Volumetric energy density Conformal structure Full cell

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相对论重离子碰撞中正反粒子椭圆流的劈裂

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科学通报 2020年第9期65卷 790-799页

作者：徐骏刘鹤 Che Ming Ko 中国科学院上海高等研究院上海201210 中国科学院上海应用物理研究所上海201800 中国科学院大学核科学与技术学院北京100049 Cyclotron institute and Department of physics and Astronomy Texas A&M UniversityCollege StationTX77843-3366USA

相对论重离子碰撞是研究极端高温高密条件下新物质形态及量子色动力学相图的重要实验手段,而椭圆流是相对论重离子碰撞的重要实验观测量.近年来在美国布鲁克海文国家实验室的相对论重离子对撞机上进行束流能量扫描实验,研究人员发现了... 详细信息

相对论重离子碰撞是研究极端高温高密条件下新物质形态及量子色动力学相图的重要实验手段,而椭圆流是相对论重离子碰撞的重要实验观测量.近年来在美国布鲁克海文国家实验室的相对论重离子对撞机上进行束流能量扫描实验,研究人员发现了一些异于极端相对论重离子碰撞的行为,比如正反粒子椭圆流的劈裂.基于拓展的多相输运模型,可以通过正反粒子的不同平均场势来解释该实验现象,并可据此提取高重子及同位旋化学势下夸克物质的状态方程及相图信息.

关键词：相对论重离子碰撞椭圆流量子色动力学相图多相输运模型

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离子液体调控超导研究

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中国科学：物理学、力学、天文学 2021年第4期51卷 201-220页

作者：曲壮壮江星宇路建明陈其宏叶剑挺北京大学物理学院人工微结构和介观物理国家重点实验室北京100109 中国科学院物理研究所北京凝聚态物理国家研究中心北京100190 中国科学院大学物理科学学院北京100049 Device physics of Complex Materials Zemike Institute for Advanced MaterialsUniversity of GroningenGroningen 9746AGthe Netherlands

载流子在超导材料中扮演关键角色,其浓度调控对研究超导特性及相关量子器件至关重要.然而载流子浓度通常与其他自由度相互耦合,难以做到单一物理量变化,例如,化学掺杂同时会导致晶格等发生变化.最近迅速发展的离子液体调控技术,兼具了... 详细信息

载流子在超导材料中扮演关键角色,其浓度调控对研究超导特性及相关量子器件至关重要.然而载流子浓度通常与其他自由度相互耦合,难以做到单一物理量变化,例如,化学掺杂同时会导致晶格等发生变化.最近迅速发展的离子液体调控技术,兼具了传统的化学掺杂和场效应晶体管优点——大范围、原位、可逆地调节载流子浓度.随着这项技术的发展,逐渐演变出两类调控思路:静电场效应和电化学调控.本文从这两个方面,回顾了离子液体调控在诱导新奇超导态和调控高温超导薄膜物性上的应用:静电场效应对绝缘或半导体体系十分有效,而对于本身载流子浓度较高的材料(如高温超导体等),电化学调控则发挥了重要作用.离子液体因其强大的原位调控能力和易于与其他手段结合的特点,正逐渐成为超导研究中不可或缺的手段,在构建精确相图、突破高温超导机理等方面发挥不可替代的作用.

关键词：离子液体调控过渡金属硫族化物伊辛超导体高温超导体

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