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arXiv 2022年

作者： Zheng, Wenkai Xiang, Li de Quesada, Felipe Augustin, Mathias Lu, Zhengguang Wilson, Matthew Sood, Aditya Wu, Fengcheng Shcherbakov, Dmitry Memaran, Shahriar Baumbach, Ryan E. McCandless, Gregory T. Chan, Julia Y. Liu, Song Edgar, James Lau, Chun Ning Lui, Chun Hung Santos, Elton Lindenberg, Aaron Smirnov, Dmitry Balicas, Luis National High Magnetic Field Laboratory TallahasseeFL32310 United States Department of Physics Florida State University TallahasseeFL32306 United States Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Materials Science and Engineering Stanford University StanfordCA94305 United States Institute for Condensed Matter Physics and Complex Systems School of Physics and Astronomy The University of Edinburgh EdinburghEH9 3FD United Kingdom Department of Physics and Astronomy University of California RiversideCA92521 United States School of Physics and Technology Wuhan University Wuhan430072 China Department of Physics The Ohio State University ColumbusOH43210 United States Department of Chemistry and Biochemistry Chemistry and Biochemistry Baylor University WacoTX76798 United States Tim Taylor Department of Chemical Engineering Kansas State University ManhattanKS66506 United States Higgs Centre for Theoretical Physics The University of Edinburgh EdinburghEH9 3FD United Kingdom Donostia International Physics Centre Donostia-San Sebastian20018 Spain Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States

Interlayer excitons, or bound electron-hole pairs whose constituent quasiparticles are located in distinct stacked semiconducting layers, are being intensively studied in heterobilayers of two dimensional semiconductors. They owe their existence to an intrinsic type-II band alignment between both layers that convert these into p-n junctions. Here, we unveil a pronounced interlayer exciton (IX) in heterobilayers of metal monochalcogenides, namely γ-InSe on Ε-GaSe, whose pronounced emission is adjustable just by varying their thicknesses given their number of layers dependent direct bandgaps. Time-dependent photoluminescense spectroscopy unveils considerably longer interlayer exciton lifetimes with respect to intralayer ones, thus confirming their nature. The linear Stark effect yields a bound electron-hole pair whose separation d is just (3.6 ± 0.1) Å with d being very close to dSe = 3.4 Å which is the calculated interfacial Se separation. The envelope of IX is twist angle dependent and describable by superimposed emissions that are nearly equally spaced in energy, as if quantized due to localization induced by the small moiré periodicity. These heterostacks are characterized by extremely flat interfacial valence bands making them prime candidates for the observation of magnetism or other correlated electronic phases upon carrier doping. Copyright © 2022, The Authors. All rights reserved.

关键词： Excitons

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Quantum spin ice response to a magnetic field in the dipole-octupole pyrochlore Ce2Zr2O7

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Physical Review B 2023年第5期108卷 054438-054438页

作者： E. M. Smith J. Dudemaine B. Placke R. Schäfer D. R. Yahne T. DeLazzer A. Fitterman J. Beare J. Gaudet C. R. C. Buhariwalla A. Podlesnyak Guangyong Xu J. P. Clancy R. Movshovich G. M. Luke K. A. Ross R. Moessner O. Benton A. D. Bianchi B. D. Gaulin Department of Physics and Astronomy McMaster University Hamilton Ontario L8S 4M1 Canada Brockhouse Institute for Materials Research McMaster University Hamilton Ontario L8S 4M1 Canada Département de Physique Université de Montréal Montréal Quebec H2V 0B3 Canada Regroupement Québécois sur les Matériaux de Pointe (RQMP) Quebec H3T 3J7 Canada Max Planck Institute for the Physics of Complex Systems Nöthnitzer Straße 38 Dresden 01187 Germany Department of Physics Boston University Boston Massachusetts 02215 USA Department of Physics Colorado State University 200 West Lake Street Fort Collins Colorado 80523-1875 USA NIST Center for Neutron Research National Institute of Standards and Technology MS 6100 Gaithersburg Maryland 20899 USA Department of Materials Science and Eng. University of Maryland College Park Maryland 20742-2115 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Canadian Institute for Advanced Research 661 University Avenue Toronto Ontario M5G 1M1 Canada

The pyrochlore magnet Ce2Zr2O7 has attracted much attention as a quantum spin ice candidate whose novelty derives in part from the dipolar-octupolar nature of the Ce3+ pseudospin-1/2 degrees of freedom it possesses. We report heat capacity measurements on single crystal samples of Ce2Zr2O7 down to T∼0.1K in a magnetic field along the [1,1¯,0] direction. These measurements show that the broad hump in the zero-field heat capacity moves higher in temperature with increasing field strength and is split into two separate humps by the [1,1¯,0] magnetic field at ∼2T. These separate features are due to the decomposition of the pyrochlore lattice into effectively decoupled chains for fields in this direction: One set of chains (α chains) is polarized by the field while the other (β chains) remains free. This situation is similar to that observed in the classical spin ices Ho2Ti2O7 and Dy2Ti2O7, but with the twist that here the strong transverse exchange interactions produce substantial quantum effects. Our theoretical modeling suggests that the β chains are close to a critical state, with nearly-gapless excitations. We also report elastic and inelastic neutron scattering measurements on single crystal Ce2Zr2O7 in [1,1¯,0] and [0,0,1] magnetic fields at temperatures down to T=0.03K. The elastic scattering behaves consistently with the formation of independent chains for a [1,1¯,0] field, while the [0,0,1] field produces a single field-induced elastic magnetic Bragg peak at (0,2,0) and equivalent wavevectors, indicating a polarized spin ice state for fields above ∼3T. For both [1,1¯,0] and [0,0,1] magnetic fields, our inelastic neutron scattering results show an approximately-dispersionless continuum of scattering that increases in both energy and intensity with increasing field strength. By modeling the complete set of experimental data using numerical linked cluster and semiclassical molecular dynamics calculations, we demonstrate the dominantly multipolar nature of the exch

关键词： Exchange interaction Frustrated magnetism Quantum spin liquid Pyrochlores Cluster expansion Molecular dynamics Neutron scattering Specific heat measurements

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Entanglement and complexity of purification in (1+1)-dimensional free conformal field theories

arXiv

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arXiv 2020年

作者： Camargo, Hugo A. Hackl, Lucas Heller, Michal P. Jahn, Alexander Takayanagi, Tadashi Windt, Bennet Max-Planck-Institut für Gravitationsphysik Am Mühlenberg 1 Potsdam-Golm14476 Germany Dahlem Center for Complex Quantum Systems Freie Universität Berlin Arnimallee 14 Berlin14195 Germany School of Physics The University of Melbourne ParkvilleVIC3010 Australia QMATH Department of Mathematical Sciences University of Copenhagen Universitetsparken 5 Copenhagen2100 Denmark Max-Planck-Institut für Quantenoptik Hans-Kopfermann-Str. 1 Garching85748 Germany Munich Center for Quantum Science and Technology Schellingstr. 4 München80799 Germany Center for Gravitational Physics Yukawa Institute for Theoretical Physics Kyoto University Kyoto606-8502 Japan Inamori Research Institute for Science 620 Suiginya-cho Shimogyo-ku Kyoto600-8411 Japan Kavli Institute for the Physics and Mathematics of the Universe University of Tokyo Kashiwa Chiba277-8582 Japan Blackett Laboratory Imperial College London Prince Consort Road SW7 2AZ United Kingdom National Centre for Nuclear Research Pasteura 7 Warsaw02-093 Poland

Finding pure states in an enlarged Hilbert space that encode the mixed state of a quantum field theory as a partial trace is necessarily a challenging task. Nevertheless, such purifications play the key role in characterizing quantum information-theoretic properties of mixed states via entanglement and complexity of purifications. In this article, we analyze these quantities for two intervals in the vacuum of free bosonic and Ising conformal field theories using, for the first time, the most general Gaussian purifications. We provide a comprehensive comparison with existing results and identify universal properties. We further discuss important subtleties in our setup: the massless limit of the free bosonic theory and the corresponding behaviour of the mutual information, as well as the Hilbert space structure under the Jordan-Wigner mapping in the spin chain model of the Ising conformal field theory. Copyright © 2020, The Authors. All rights reserved.

关键词： Bosons

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Inside Cover: A novel in vivo Cerenkov luminescence image-guided surgery on primary and metastatic colorectal cancer (J. Biophotonics 3/2020)

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Journal of Biophotonics 2020年第3期13卷

作者： Zeyu Zhang Yawei Qu Yu Cao Xiaojing Shi Hongbo Guo Xiaojun Zhang Sheng Zheng Haifeng Liu Zhenhua Hu Jie Tian Engineering Research Center of Molecular and Neuro Imaging of Ministry of Education School of Life Science and Technology Xidian University Xi'an China CAS Key Laboratory of Molecular Imaging Beijing Key Laboratory of Molecular Imaging The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China Department of Gastroenterology the Third Medical Centre Chinese PLA General Hospital Beijing China Department of Control Science and Engineering Harbin Institute of Technology Harbin China Department of Anorectal the Third medical Centre Chinese PLA General Hospital Beijing China University of Chinese Academy of Sciences Beijing China School of Information Sciences and Technology Northwest University Xi'an China Department of Nuclear Medicine Chinese PLA General Hospital Beijing China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Medicine Beihang University Beijing China

This study presents a novel intraoperative in vivo imaging approach which harnessed Cerenkov luminescence (CL) to detect primary and metastatic colorectal cancer (CRC) using clinically approved radiopharmaceuticals. In the mice and swine experiments, the proposed approach effectively improved the effect of CRC surgery. The approach is believed to be promising for utilizing CL in open surgery. Further details can be found in the article by Zeyu Zhang, Yawei Qu, Yu Cao et al. ( e201960152 )

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SYSTEM ENGINEERING STATE-OF-ART EQUAL TO MODERN WARSHIP DESIGN

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NAVAL ENGINEERS JOURNAL 1978年第2期90卷 130-136页

作者： ECKHART, M USN (RET.) The Authoris currently Chief Scientist in the Autonetics Marine Systems Division Rockwell International concentrating in Digital Simulation Applications in System Engineering. A graduate of the U. S. Naval Academy in 1945 he served in various surface assignments until 1950. Subsequent thereto after being designated an Engineering Duty Officer (ED) he had Type Commander Staff Laboratory ESO and Naval Shipyard assignments until 1962 when he became the Miltary Chairman Electrical Science at the U. S. Naval Academy. In 1965 he became the Head Electrical/Electronics Design Branch Bureau of Ships remaining in this assignment until 1967 when he assumed the responsibilities of Director Ship Concept Design Division Naval Ship Engineering Center. Upon retiring from the U. S. Naval Service in 1970 he joined Rockewell International and the following year became the Manager of the Integration Programs Group involved in Model—Based Systems Analysis EM Effectiveness Submarine Control and Ship Data Miltiplexing. His education includes a BS degree from the U. S. Naval Academy a BS degree in Electrical Engineering received from Massachusetts Institute of Technology in 1949 and a MS degree in Electrical Engineering received from The George Washington University in 1967. A former ASNE Council Member he has been active in ASNE at both the National and Local Section levels since 1967.

The general systems engineering state—of—the—art has not been equal to the functional diversity of modern multimission warships, nor to the more complex system relationships that are characteristically involved in their design. Resultant dependence upon qualitative assessments of higher level relationships in warship definition and design has been and is a critical impediment to the Navy's corporate purposes, both in prosecuting its vital rebuilding campaign and in dealing with the technological pace of naval warfare. A design methodology development, first reported on ASNE Day 74, has provided the basis for removing this impediment. The threshold criterion of system engineering, quantification, and correlation of total system design objectives, can be satisfied for warship definition and design. Further, the basic elements of an exploitive system engineering practice have been developed sufficiently to confirm their validity. This work is interpreted in terms of the system engineering structure that can be expected to emerge; first, because it can be done, and second, because its payoffs are so urgently needed by the Navy.

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Dilution‐Induced Self‐Assembly of Porphyrin Aggregates: A Consequence of Coupled Equilibria†

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Angewandte Chemie 2010年第23期122卷

作者： Floris Helmich Cameron C. Lee Marko M. L. Nieuwenhuizen Jeroen C. Gielen Peter C. M. Christianen Antje Larsen George Fytas Philippe E. L. G. Leclère Albertus P. H. J. Schenning E. W. Meijer Laboratory of Macromolecular and Organic Chemistry Institute for Complex Molecular Systems Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven (The Netherlands) Fax: (+31) 40‐245‐1036 Institute for Molecules and Materials Radboud University Nijmegen Toernooiveld 7 6525 ED Nijmegen (The Netherlands) Department of Material Science F.O.R.T.H./I.E.S.L. P.O. Box 1527 71110 Heraklion (Greece) Laboratory for Chemistry of Novel Materials Université de Mons 7000 Mons (Belgium)

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Cover Picture: Switchable Electrostatically Templated Polymerization (Angew. Chem. Int. Ed. 39/2022)

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Angewandte Chemie International Edition 2022年第39期61卷

作者： Chendan Li Jose R. Magana Fabian Sobotta Junyou Wang Martien A. Cohen Stuart Bas G. P. van Ravensteijn Ilja K. Voets State Key Laboratory of Chemical Engineering and Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 P. R. China Institute for Complex Molecular Systems Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Current address: Grup d'Enginyeria de Materials (GEMAT) Institut Químic de Sarrià (IQS) Universitat Ramon Llull (URL) 08022 Barcelona Spain Current address: Department of Pharmaceutics Utrecht Institute for Pharmaceutical Sciences (UIPS) Faculty of Science Utrecht University P.O. Box 80082 3508 TB Utrecht The Netherlands

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Switchable Electrostatically Templated Polymerization

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Angewandte Chemie 2022年第39期134卷

We report a switchable, templated polymerization system where the strength of the templating effect can be modulated by solution pH and/or ionic strength. The responsiveness to these cues is incorporated through a dendritic polyamidoamine-based template of which the charge density depends on pH. The dendrimers act as a template for the polymerization of an oppositely charged monomer, namely sodium styrene sulfonate. We show that the rate of polymerization and maximum achievable monomer conversion are directly related to the charge density of the template, and hence the environmental pH. The polymerization could effectively be switched “ON” and “OFF” on demand, by cycling between acidic and alkaline reaction environments. These findings break ground for a novel concept, namely harnessing co-assembly of a template and growing polymer chains with tunable association strength to create and control coupled polymerization and self-assembly pathways of (charged) macromolecular building blocks.

关键词： complex Core Coacervate Micelles PIESA Polyelectrolytes RAFT Polymerization Templated Polymerizations

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Titelbild: Switchable Electrostatically Templated Polymerization (Angew. Chem. 39/2022)

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Angewandte Chemie 2022年第39期134卷

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Sedimentation of general shaped particles using a multigrid fictitious boundary method

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Physics of Fluids 2020年第6期32卷

作者： Khuram Walayat Nazia Talat Saqia Jabeen Kamran Usman Moubin Liu (刘谋斌) 1BIC-ESAT College of Engineering Peking University Beijing 100871 China 2State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science Peking University Beijing 100871 China 3Faculty of Engineering Technology (ET) Department of Thermal and Fluid Engineering (TFE) University of Twente Enschede 7500 AE The Netherlands 4Department of Computer Science Bahria University Islamabad 44000 Pakistan 5Department of Mathematics Faculty of Basic and Applied Sciences Air University Islamabad 44000 Pakistan

In this paper, a direct numerical simulation technique, the Finite Element Fictitious Boundary Method (FBM), is used to simulate fluid–solid two-phase flows of different general shaped particles. The momentum interactions between solid and fluid phases are handled by using the FBM. The continuity and momentum equations are solved on a fixed Eulerian grid that is independent of flow features by using a discrete projection scheme inside a multi-grid finite element approach. A detailed description is presented for the geometric representation and modeling of two-dimensional particles of different general shapes, i.e., circular, elliptical, square, rectangular, triangular, and pentagonal shapes inside the fluid. We discussed the effects of particle shapes and the influences on the settling behavior of the particles. A comparison of the settling trajectories of the particles of the same mass but with different shapes is presented. Moreover, depending upon the particle’s shape, some interesting facts are discovered, which have a great influence on the particles’ trajectory and settling velocity. Some very important correlations between the drag force coefficient and particle’s Reynolds numbers with different density ratios of particles are obtained. Furthermore, we also studied the settling behavior of elliptical and rectangular particles with different axis ratios and a boomerang particle with different concave *** authors of the article agree to the retraction of the article effective AUGUST 20, 2021.

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