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arXiv 2020年

作者： Zhuravlev, Pavel I. Hinczewski, Michael Thirumalai, Dave Biophysics Program Institute for Physical Science and Technology Department of Chemistry & Biochemistry University of Maryland College ParkMD20742 United States Department of Physics Case Western Reserve University ClevelandOH44106 United States Department of Chemistry University of Texas AustinTX7712 United States

Deviations from linearity in the dependence of the logarithm of protein unfolding rates, log ku(f), as a function of mechanical force, f, measurable in single molecule experiments, can arise for many reasons. In particular, upward curvature in log ku(f) as a function of f implies that the underlying energy landscape must be multidimensional with the possibility that unfolding ensues by parallel pathways. Here, simulations using the SOP-SC model of a wild type β-sandwich protein and several mutants, with immunoglobulin folds, show upward curvature in the unfolding kinetics. There are substantial changes in the structures of the transition state ensembles as force is increased, signaling a switch in the unfolding pathways. Our results, when combined with previous theoretical and experimental studies, show that parallel unfolding of structurally unrelated single domain proteins can be determined from the dependence of log ku(f) as a function of force (or log ku[C] where [C] is the denaturant concentration). © 2020, CC BY.

关键词： Proteins

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Temperature-Induced Lifshitz Transition and Possible Excitonic Instability in ZrSiSe

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physical Review Letters 2020年第23期124卷 236601-236601页

作者： F. C. Chen Y. Fei S. J. Li Q. Wang X. Luo J. Yan W. J. Lu P. Tong W. H. Song X. B. Zhu L. Zhang H. B. Zhou F. W. Zheng P. Zhang A. L. Lichtenstein M. I. Katsnelson Y. Yin Ning Hao Y. P. Sun Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China Department of Physics Zhejiang University Hangzhou 310027 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei 230031 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China Institute for Theoretical Physics University Hamburg Jungiusstrasse 9 D-20355 Hamburg Germany Theoretical Physics and Applied Mathematics Department Ural Federal University Mira Street 19 620002 Ekaterinburg Russia Institute for Molecules and Materials Radboud University Heijendaalseweg 135 NL-6525AJ Nijmegen The Netherlands Collaborative Innovation Center of Microstructures Nanjing University Nanjing 210093 China

The nodal-line semimetals have attracted immense interest due to the unique electronic structures such as the linear dispersion and the vanishing density of states as the Fermi energy approaching the nodes. Here, we report temperature-dependent transport and scanning tunneling microscopy (spectroscopy) [STM(S)] measurements on nodal-line semimetal ZrSiSe. Our experimental results and theoretical analyses consistently demonstrate that the temperature induces Lifshitz transitions at 80 and 106 K in ZrSiSe, which results in the transport anomalies at the same temperatures. More strikingly, we observe a V-shaped dip structure around Fermi energy from the STS spectrum at low temperature, which can be attributed to co-effect of the spin-orbit coupling and excitonic instability. Our observations indicate the correlation interaction may play an important role in ZrSiSe, which owns the quasi-two-dimensional electronic structures.

关键词： Single crystal materials First-principles calculations Scanning tunneling spectroscopy

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Prediction of solar energetic events impacting space weather conditions

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Advances in Space Research 2024年

作者： Georgoulis, Manolis K. Yardley, Stephanie L. Guerra, Jordan A. Murray, Sophie A. Ahmadzadeh, Azim Anastasiadis, Anastasios Angryk, Rafal Aydin, Berkay Banerjee, Dipankar Barnes, Graham Bemporad, Alessandro Benvenuto, Federico Bloomfield, D. Shaun Bobra, Monica Campi, Cristina Camporeale, Enrico DeForest, Craig E. Emslie, A. Gordon Falconer, David Feng, Li Gan, Weiqun Green, Lucie M. Guastavino, Sabrina Hapgood, Mike Kempton, Dustin Kitiashvili, Irina Kontogiannis, Ioannis Korsos, Marianna B. Leka, K.D. Massa, Paolo Massone, Anna Maria Nandy, Dibyendu Nindos, Alexander Papaioannou, Athanasios Park, Sung-Hong Patsourakos, Spiros Piana, Michele Rawafi, Nour E. Sadykov, Viacheslav M. Toriumi, Shin Vourlidas, Angelos Wang, Haimin L. Wang, Jason T. Whitman, Kathryn Yan, Yihua Zhukov, Andrei N. Research Center for Astronomy and Applied Mathematics of the Academy of Athens Athens11527 Greece Department of Mathematics Physics and Electrical Engineering Northumbria University Newcastle upon TyneNE1 8ST United Kingdom Department of Meteorology University of Reading ReadingRG6 6ET United Kingdom Paseo Manuel de Lardizabal 4 San Sebastián20018 Spain CIRES University of Colorado BoulderCO80309 United States NOAA Space Weather Prediction Center BoulderCO80305 United States School of Cosmic Physics Dublin Institute for Advanced Studies Dunsink Observatory DublinD15 XR2R Ireland Computer Science Department Georgia State University AtlantaGA30303 United States National Observatory of Athens Penteli15236 Greece Uttarakhand Nainital263001 India NorthWest Research Associates BoulderCO80301 United States INAF Turin Astrophysical Observatory via Osservatorio 20 10025 Pino Torinese Torino Italy MIDA Dipartimento di Matematica Università di Genova via Dodecaneso 35 16146 Genova Italy State of California Office of Data and Innovation 401 I Street Ste 200 SacramentoCA95814 United States Southwest Research Institute BoulderCO80302 United States Department of Physics & Astronomy Western Kentucky University Bowling GreenKY42101 United States Center for Space Plasma and Aeronomic Research University of Alabama in Huntsville HuntsvilleAL35899 United States NASA/Marshall Space Flight Center HuntsvilleAL35812 United States Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China Mullard Space Science Laboratory University College London Holmbury St. MaryRH5 6NT United Kingdom University of Chinese Academy of Sciences Nanjing211135 China Visiting Scientist RAL Space STFC Rutherford Appleton Laboratory Oxfordshire DidcotOX11 0QX United Kingdom NASA Ames Research Center Moffett FieldCA94035 United States An der Sternwarte 16 Potsdam14482 Germany Dipartime

Aiming to assess the progress and current challenges on the formidable problem of the prediction of solar energetic events since the COSPAR/ International Living With a Star (ILWS) Roadmap paper of Schrijver et al. (2015), we attempt an overview of the current status of global research efforts. By solar energetic events we refer to flares, coronal mass ejections (CMEs), and solar energetic particle (SEP) events. The emphasis, therefore, is on the prediction methods of solar flares and eruptions, as well as their associated SEP manifestations. This work complements the COSPAR International Space Weather Action Teams (ISWAT) review paper on the understanding of solar eruptions by Linton et al. (2023) (hereafter, ISWAT review papers are conventionally referred to as ’Cluster’ papers, given the ISWAT structure). Understanding solar flares and eruptions as instabilities occurring above the nominal background of solar activity is a core solar physics problem. We show that effectively predicting them stands on two pillars: physics and statistics. With statistical methods appearing at an increasing pace over the last 40 years, the last two decades have brought the critical realization that data science needs to be involved, as well, as volumes of diverse ground- and space-based data give rise to a Big Data landscape that cannot be handled, let alone processed, with conventional statistics. Dimensionality reduction in immense parameter spaces with the dual aim of both interpreting and forecasting solar energetic events has brought artificial intelligence (AI) methodologies, in variants of machine and deep learning, developed particularly for tackling Big Data problems. With interdisciplinarity firmly present, we outline an envisioned framework on which statistical and AI methodologies should be verified in terms of performance and validated against each other. We emphasize that a homogenized and streamlined method validation is another open challenge. The performance of the

关键词： Solar energy

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Search for charged lepton flavor violating decays of Υ(1S)

arXiv

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arXiv 2022年

作者： Patra, Sourav Bhardwaj, V. Trabelsi, K. Adachi, I. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bessner, M. Bhuyan, B. Bilka, T. Bobrov, A. Bodrov, D. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T.E. Budano, A. Campajola, M. Červenkov, D. Chang, M.-C. Chang, P. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Das, S. De Nardo, G. De Pietro, G. Dhamija, R. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Epifanov, D. Ferber, T. Frey, A. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Giri, A. Goldenzweig, P. Graziani, E. Gu, T. Hara, T. Hayasaka, K. Hayashii, H. Hedges, M.T. Hernandez Villanueva, M. Hou, W.-S. Hsu, C.-L. Iijima, T. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jang, E.-J. Jia, S. Jin, Y. Joo, K.K. Kahn, J. Kaliyar, A.B. Kang, K.H. Karyan, G. Kawasaki, T. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, K.-H. Kim, K.T. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kumar, M. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lalwani, K. Lam, T. Lange, J.S. Lee, S.C. Li, C.H. Li, J. Li, L.K. Li, Y. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liventsev, D. Martini, A. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Metzner, F. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Mussa, R. Nakao, M. Natochii, A. Nayak, L. Nayak, M. Nisar, N.K. Nishida, S. Ogawa, K. Ogawa, S. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pang, T. Pardi, S. Park, H. Park, S.-H. Passeri, A. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Popov, V. Prencipe, E. Prim, M.T. Röhrken, M. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sandilya, S. Sangal, A. Santelj, L. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of Chung-Ang University Seoul06974 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany Duke University DurhamNC27708 United States Duy Tan University Hanoi100000 Viet Nam University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China Justus-Liebig-Universität Gießen Gießen 35392 Germany Gifu University Gifu501-1193 Japan II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen37073 Germany Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan National Research University Higher School of Economics Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research SAS Nagar Mohali140306 India Indian Institute of Technology Satya Nagar Bhubaneswar751007 India Indian Institute of Technology Assam Guwahati781039 India Indian Institute of Technology Telangana Hyderabad502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute

We present a search for the charged lepton-flavor-violating decays Υ(1S) → ±0 and radiative charged lepton-flavour-violating decays Υ(1S) → γ±0 [, 0 = e, µ, τ] using the 158 million Υ(2S) sample collected by the Belle detector at the KEKB collider. This search uses Υ(1S) mesons produced in Υ(2S) → π+π−Υ(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level. © 2022, CC BY.

关键词： Luminance

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Gapless quantum spin liquid in the triangular system sr3cusb2o9

arXiv

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arXiv 2020年

作者： Kundu, Susanta Shahee, Aga Chakraborty, Atasi Ranjith, K.M. Koo, B. Sichelschmidt, Jörg Telling, Mark T.F. Biswas, P.K. Baenitz, M. Dasgupta, I. Pujari, Sumiran Mahajan, A.V. Department of Physics Indian Institute of Technology Bombay MumbaiPowai400076 India School of Physical Sciences Indian Association for the Cultivation of Science KolkataJadavpur700032 India Max Planck Institute for Chemical Physics of Solids Dresden01187 Germany ISIS Pulsed Neutron and Muon Source STFC Rutherford Appleton Laboratory Harwell Campus OxfordshireDidcotOX110QX United Kingdom

We report gapless quantum spin liquid behavior in the layered triangular Sr3CuSb2O9 (SCSO) system. X-ray diffraction shows superlattice reflections associated with atomic site ordering into triangular Cu planes well-separated by Sb planes. Muon spin relaxation (µSR) measurements show that the S = 12 moments at the magnetically active Cu sites remain dynamic down to 65 mK in spite of a large antiferromagnetic exchange scale evidenced by a large Curie-Weiss temperature θcw ' −143 K as extracted from the bulk susceptibility. Specific heat measurements also show no sign of long-range order down to 0.35 K. The magnetic specific heat (Cm) below 5 K reveals a Cm = γT + αT2 behavior. The significant T2 contribution to the magnetic specific heat invites a phenomenology in terms of the so-called Dirac spinon excitations with a linear dispersion. From the low-T specific heat data, we estimate the dominant exchange scale to be ∼ 36 K using a Dirac spin liquid ansatz which is not far from the values inferred from microscopic density functional theory calculations (∼ 45 K) as well as high-temperature susceptibility analysis (∼ 70 K). The linear specific heat coefficient is about 18 mJ/mol-K2 which is somewhat larger than for typical Fermi liquids. Copyright © 2020, The Authors. All rights reserved.

关键词： Fermi liquids

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Out-of-plane cations homogenise perovskite composition for solar cells

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Nature 2023年 557-563页

作者： Zheng Liang Huifen Xu Boyuan Liu Hui Zhang Zihan Wang Huijie Hu Xingyou Tian Jiajiu Ye Xu Pan Wenjing Chen Hongmin Zhou Zhengguo Xiao Yong Zhang Jiyao Zhang Baomin Xu Dong-Ho Kang Nam-Gyu Park Jianrong Zeng Xingyu Gao Qisheng Wang Xiangbin Cai Peter Reiss Thomas Kirchartz Songyuan Dai Key Laboratory of Photovoltaic and Energy Conservation Material Institute of Solid-State Physics (ISSP) Hefei Institutes of Physical Science (HIPS) Chinese Academy of Sciences Hefei P. R. China University of Science and Technology of China (USTC) Hefei P. R. China IEK5-Photovoltaics Forschungszentrum Jülich Jülich Germany Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics University of Science and Technology of China (USTC) Hefei P. R. China Instruments Center for Physical Science (PIC) University of Science and Technology of China (USTC) Hefei P. R. China Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and Technology (SUSTech) Shenzhen P. R. China Department of Materials Science and Engineering Southern University of Science and Technology (SUSTech) Shenzhen P. R. China School of Chemical Engineering and Center for Antibonding Regulated Crystals Sungkyunkwan University (SKKU) Suwon Republic of Korea SKKU Institute of Energy Science & Technology (SIEST) Sungkyunkwan University Suwon Republic of Korea Shanghai Synchrotron Radiation Facility (SSRF) Shanghai Advanced Research Institute (SARI) and Shanghai Institute of Applied Physics Chinese Academy of Sciences (CAS) Shanghai P. R. China Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong P. R. China University Grenoble-Alpes CEA CNRS INP IRIG/SyMMES STEP Grenoble France Faculty of Engineering and CENIDE University of Duisburg-Essen Duisburg Germany State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University (NCEPU) Beijing P. R. China

Perovskite solar cells (PSCs) composing the formula of FA1-xCsxPbI3provide an attractive ption for integrating high efficiency, durable stability and compatibility with upscale fabrication. Despite the Cs cation incorporation potentially enabling a perfect perovskite lattice1,2, the compositional inhomogeneity caused by A-site cation segregation is likely detrimental to the photovoltaic performance of solar cells3,4. Here, we visualized the out of-plane compositional inhomogeneity along the vertical direction across the perovskite films and identified the underlying reasons and the potential impacts for devices. We devised a strategy using 1-(Phenylsulfonyl)pyrrole (PSP) to homogenize the cations components in the perovskite films. The resultant p-i-n devices yielded a certified steady state PCE of 25.2% and durable stability.

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Study of B¯0→D+h−(h=K/π) decays at Belle

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physical Review D 2022年第1期105卷 012003-012003页

作者： E. Waheed P. Urquijo I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev S. Bahinipati P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov D. Bodrov J. Borah A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua Z. Doležal T. V. Dong D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig B. Golob E. Graziani T. Gu Y. Guan K. Gudkova C. Hadjivasiliou S. Halder O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang H. Kichimi C. H. Kim D. Y. Kim K.-H. Kim K. T. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny M. Kumar R. Kumar K. Kumara Y.-J. Kwon Y.-T. Lai J. S. Lange M. Laurenza S. C. Lee J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty R. Mussa M. Nakao A. Natochii L. Nayak M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova T. Pang H. Park S.-H. Park A. Passeri S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya L. Santelj T. Sanuki V. Savinov G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu F. Simon J. B. Singh A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno K. Uno S. Uno Y. Usov S. E. Vahsen R. Van Tonder G. Varner K. E. Varvell A. Vinokurova C. H. Wan High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 School of Physics University of Melbourne Victoria 3010 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 National Research University Higher School of Economics Moscow 101000 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN—Sezione di Roma Tre I-00146 Roma INFN—Sezione di Napoli I-80126 Napoli Università di Napoli Federico II I-80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 Department of Physics National Taiwan University Taipei 10617 National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 Korea Institute of Science and Technology Information Daejeon 34141 Yonsei University Seoul 03722 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderaba

We present a measurement of the branching fractions of the Cabibbo favored B¯0→D+π− and the Cabibbo suppressed B¯0→D+K− decays. We find B(B¯0→D+π−)=(2.48±0.01±0.09±0.04)×10−3 and B(B¯0→D+K−)=(2.03±0.05±0.07±0.03)×10−4 decays, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the D+→K−π+π+ branching fraction. The ratio of branching fractions of B¯0→D+K− and B¯0→D+π− is measured to be RD=[8.19±0.20(stat)±0.23(syst)]×10−2. These measurements are performed using the full Belle dataset, which corresponds to 772×106BB¯ pairs and use the Belle II software framework for data analysis.

关键词： Form factors Particle decays Particle interactions Particle mixing & oscillations W & Z bosons

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Linker Vacancy Engineering of a Robust ftw-type Zr-MOF for Hexane Isomers Separation

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Angewandte Chemie 2023年第24期135卷

作者： Fu-An Guo Dr. Jing Wang Dr. Cailing Chen Dr. Xinglong Dong Xingyu Li Prof. Hao Wang Prof. Peng Guo Prof. Yu Han Prof. Jing Li Hoffmann Institute of Advanced Materials Shenzhen Polytechnic 7098 Liuxian Boulevard Shenzhen Guangdong 518055 P. R. China National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia University of Chinese Academy of Sciences Beijing 100049 China Department of Chemistry and Chemical Biology Rutgers University 123 Bevier Road Piscataway NJ-08854 USA

Discrimination of physically similar molecules by porous solids represents an important yet challenging task in industrially relevant chemical separations. Precisely controlled pore dimension and/or tailored pore surface functionality are crucial to achieve high-efficiency separation. Metal-organic frameworks (MOFs) are promising candidates for these challenging separations in light of their structural diversity as well as highly adjustable pore dimension/functionality. We report here a microporous, ftw -type Zr-based MOF structure, HIAM-410 (HIAM=Hoffmann institute of Advanced Materials), built on hexanuclear Zr 6 cluster and pyrene-1,3,6,8-tetracarboxylate (ptc 4− ). Its crystallographic structure has been determined using continuous rotation electron diffraction (cRED) technique combined with Rietveld refinement against powder X-ray diffraction data, aided by low-dose high-resolution transmission electron microscopy (HRTEM) imaging. The compound features exceptional framework stability that is comparable to the prototype MOF UiO-66. Interestingly, the linker vacancies in the pristine MOF structure could be partially restored by post-synthetic linker insertion. Its separation capability of hexane isomers is enhanced substantially upon the linker vacancy engineering. The restored structure exhibits efficient splitting of monobranched and dibranched hexane isomers at both room temperature and industrially relevant temperature.

关键词： Adsorption Alkane Isomers Metal-Organic Frameworks Separation

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Population of Merging Compact Binaries Inferred Using Gravitational Waves through GWTC-3

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physical Review X 2023年第1期13卷 011048-011048页

作者： R. Abbott T. D. Abbott F. Acernese K. Ackley C. Adams N. Adhikari R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu P. F. de Alarcón S. Akcay S. Albanesi A. Allocca P. A. Altin A. Amato C. Anand S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando T. Andrade N. Andres T. Andrić S. V. Angelova S. Ansoldi J. M. Antelis S. Antier F. Antonini S. Appert Koji Arai Koya Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud M. Arogeti S. M. Aronson K. G. Arun H. Asada Y. Asali G. Ashton Y. Aso M. Assiduo S. M. Aston P. Astone F. Aubin C. Austin S. Babak F. Badaracco M. K. M. Bader C. Badger S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer A. Balsamo G. Baltus S. Banagiri D. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi C. P. L. Berry D. Bersanetti A. Bertolini J. Betzwieser D. Beveridge R. Bhandare U. Bhardwaj D. Bhattacharjee S. Bhaumik I. A. Bilenko G. Billingsley S. Bini R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini L. D. Bonavena F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. Brandt J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic C. Buy R. L. Byer L. Cadonati LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Universitat de les Illes Balears IAC3–IEEC E-07122 Palma de Mallorca Spain University College Dublin Dublin 4 Ireland INFN Sezione di Torino I-10125 Torino Italy Università di Napoli “Federico II” Complesso Universitario di Monte S. Angelo I-80126 Napoli

We report on the population properties of compact binary mergers inferred from gravitational-wave observations of these systems during the first three LIGO-Virgo observing runs. The Gravitational-Wave Transient Catalog 3 (GWTC-3) contains signals consistent with three classes of binary mergers: binary black hole, binary neutron star, and neutron star–black hole mergers. We infer the binary neutron star merger rate to be between 10 and 1700 Gpc−3 yr−1 and the neutron star–black hole merger rate to be between 7.8 and 140 Gpc−3 yr−1, assuming a constant rate density in the comoving frame and taking the union of 90% credible intervals for methods used in this work. We infer the binary black hole merger rate, allowing for evolution with redshift, to be between 17.9 and 44 Gpc−3 yr−1 at a fiducial redshift (z=0.2). The rate of binary black hole mergers is observed to increase with redshift at a rate proportional to (1+z)κ with κ=2.9−1.8+1.7 for z≲1. Using both binary neutron star and neutron star–black hole binaries, we obtain a broad, relatively flat neutron star mass distribution extending from 1.2−0.2+0.1 to 2.0−0.3+0.3M⊙. We confidently determine that the merger rate as a function of mass sharply declines after the expected maximum neutron star mass, but cannot yet confirm or rule out the existence of a lower mass gap between neutron stars and black holes. We also find the binary black hole mass distribution has localized over- and underdensities relative to a power-law distribution, with peaks emerging at chirp masses of 8.3−0.5+0.3 and 27.9−1.8+1.9M⊙. While we continue to find that the mass distribution of a binary’s more massive component strongly decreases as a function of primary mass, we observe no evidence of a strongly suppressed merger rate above approximately 60M⊙, which would indicate the presence of a upper mass gap. Observed black hole spins are small, with half of spin magnitudes below χi≈0.25. While the majority of spins are preferentially aligned wi

关键词： Gravitational wave sources Gravitational waves Gravitational wave detection

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Symmetry-mediated quantum coherence of W5+ spins in an oxygen-deficient double perovskite

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npj Quantum Materials 2025年第1期10卷 1-11页

作者： Shannon Bernier Mekhola Sinha Maxime A. Siegler W. Adam Phelan Abby N. Neill Tyrel M. McQueen Tyler J. Pearson Danna E. Freedman Peter V. Sushko Paul H. Oyala Department of Chemistry The Johns Hopkins University Baltimore MD 21218 USA Institute for Quantum Matter William H. Miller III Department of Physics and Astronomy The Johns Hopkins University Baltimore MD 21218 USA Department of Materials Science and Engineering The Johns Hopkins University Baltimore MD 21218 USA Department of Chemistry Northwestern University Evanston IL 60208 USA Physical and Computational Sciences Directorate Pacific Northwest National Laboratory Richland WA 99354 USA Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA

Elucidating the factors limiting quantum coherence in real materials is essential to the development of quantum technologies. Here we report a strategic approach to determine the effect of lattice dynamics on spin coherence lifetimes using oxygen deficient double perovskites as host materials. In addition to obtaining millisecondT1spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine thatT2enhancement in Sr2CaWO6-δover previously studied Ba2CaWO6-δis caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as W5+via electron paramagnetic resonance spectroscopy. Further, a combination of experimental and computational techniques enabled quantification of the relative strength of spin-phonon coupling of each phonon mode. This analysis demonstrates the effect of thermodynamics and site symmetry on the spin lifetimes of W5+paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits.

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