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reciprocal skin effect and its realization in a topolectrical circuit

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Physical review research 2020年第2期2卷 023265-023265页

作者： Tobias Hofmann Tobias Helbig Frank Schindler Nora Salgo Marta Brzezińska Martin Greiter Tobias Kiessling david Wolf Achim Vollhardt Anton Kabaši Ching Hua Lee Ante Bilušić ronny Thomale Titus Neupert Institute for Theoretical Physics and Astrophysics University of Würzburg Am Hubland D-97074 Würzburg Germany Department of Physics University of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland Kavli Institute for Theoretical Physics University of California Santa Barbara California 93106 USA Department of Theoretical Physics Faculty of Fundamental Problems of Technology Wrocław University of Science and Technology 50-370 Wrocław Poland Physikalisches Institut and Röntgen Research Center for Complex Material Systems Universität Würzburg D-97074 Würzburg Germany Centre of Excellence STIM University of Split Poljička cesta 35 HR-21000 Split Croatia Department of Physics National University of Singapore Singapore 117542 Institute of High Performance Computing A*STAR Singapore 138632 University of Split Faculty of Science Ruđera Boškovića 33 HR-21000 Split Croatia

A system is non-Hermitian when it exchanges energy with its environment and nonreciprocal when it behaves differently upon the interchange of input and response. Within the field of metamaterial research on synthetic topological matter, the skin effect describes the conspiracy of non-Hermiticity and nonreciprocity to yield extensive anomalous localization of all eigenmodes in a (quasi) one-dimensional geometry. Here, we introduce the reciprocal skin effect, which occurs in non-Hermitian but reciprocal systems in two or more dimensions: Eigenmodes with opposite longitudinal momentum exhibit opposite transverse anomalous localization. We experimentally demonstrate the reciprocal skin effect in a passive rLC circuit, suggesting convenient alternative implementations in optical, acoustic, mechanical, and related platforms. Skin mode localization brings forth potential applications in directional and polarization detectors for electromagnetic waves.

关键词： Classical transport Edge states Electromagnetism Electronic structure Impedance Metrology Photonics Skin effect Topological materials Tight-binding model

Pion Transition Form Factor from Twisted-Mass Lattice QCd and the Hadronic Light-by-Light π0-pole Contribution to the Muon g − 2

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arXiv 2023年

作者： Alexandrou, C. Bacchio, S. Bergner, G. Burri, S. Finkenrath, J. Gasbarro, A. Hadjiyiannakou, K. Jansen, K. Kanwar, G. Kostrzewa, B. Koutsou, G. Ottnad, K. Petschlies, M. Pittler, F. Steffens, F. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH–3012 Switzerland Bergische Universität Wuppertal Gaußstraße 20 Wuppertal42119 Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany PRISMA+ Cluster of Excellence Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 MainzD-55128 Germany Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 BonnD-53115 Germany

The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor (formula presented). Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCd. We report our results for the transition form factor parameterized using a model-independent conformal expansion valid for arbitrary space-like kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon g − 2, finding (formula presented). Copyright © 2023, The Authors. All rights reserved.

关键词： Poles

The MeerKAT Absorption Line Survey (MALS)

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The MeerKAT Absorption Line Survey (MALS)

2016 MeerKAT Science: On the Pathway to the SKA, MeerKAT 2016

作者： Gupta, N. Srianand, r. Baan, W. Baker, A. Beswick, r. Bhatnagar, S. Bhattacharya, d. Bosma, A. Carilli, C. Cluver, M. Combes, F. Cress, C. dutta, r. Fynbo, J. Heald, G. Hilton, M. Hussain, T. Jarvis, M. Jozsa, G. Kamphuis, P. Kembhavi, A. Kerp, J. Klöckner, H.-r. Krogager, J. Kulkarni, V. Ledoux, C. Mahabal, A. Mauch, T. Moodley, K. Momjian, E. Morganti, r. Noterdaeme, P. Oosterloo, T. Petitjean, P. Schröder, A. Serra, P. Sievers, J. Spekkens, K. Väisänen, P. van der Hulst, T. Vivek, M. Wang, J. Wong, O.I. Zungu, A.r. Inter-University Centre for Astronomy and Astrophysics India ASTRON Netherlands Institute for Radio Astronomy Netherlands Rutgers State University of New Jersey United States University of Manchester United Kingdom National Radio Astronomy Observatory United States Laboratoire d’Astrophysique de Marseille France Physics and Astronomy Department University of Western Cape South Africa Observa-toire de Paris France Centre for High Performance Computing South Africa Dark Cosmology Center Niels Bohr Institute Denmark CSIRO Astronomy and Space Science Australia Astrophysics and Cosmology Research Unit University of KwaZulu Natal South Africa Astrophysics University of Oxford United Kingdom Square Kilometre Array South Africa South Africa National Centre for Radio Astrophysics India Universität Bonn Germany Max-Planck-Institut für Radioastronomie Germany Institut d’Astrophysique de Paris France University of South Carolina Department of Physics and Astronomy United States European Southern Observatory Chile Astronomy Department California Institute of Technology United States South African Astronomical Observatory South Africa INAF-Osservatorio Astronomico di Cagliari Italy Department of Physics Royal Military College of Canada Canada Kapteyn Astronomical Institute University of Groningen Netherlands University of Utah United States International Centre for Radio Astronomy Research University of Western Australia Australia

deep galaxy surveys have revealed that the global star formation rate (SFr) density in the universe peaks at 1≤ z ≤2 and sharply declines towards z = 0. But a clear picture of the underlying processes, in particular the evolution of cold atomic (∼100 K) and molecular gas phases, that drive such a strong evolution is yet to emerge. MALS is designed to use MeerKAT’s L- and UHF-band receivers to carry out the most sensitive (N(H I)>1019 cm−2) dust-unbiased search of intervening H I 21-cm and OH 18-cm absorption lines at 0 1024 W Hz−1) at 0 © Copyright owned by the author(s).

关键词： Surveys

Nucleon axial and pseudoscalar form factors from lattice QCd at the physical point

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arXiv 2020年

作者： Alexandrou, Constantia Bacchio, S. Constantinou, M. dimopoulos, P. Finkenrath, J. Hadjiyiannakou, K. Jansen, K. Koutsou, G. Kostrzewa, B. Leontiou, T. Urbach, C. Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Computation-Based Science and Technology Research Center The Cyprus Institute 20 Kavafi Str. Nicosia2121 Cyprus Department of Physics Temple University 1925 N. 12th Street PhiladelphiaPA19122-1801 United States Parma43124 Italy NIC DESY Platanenallee 6 ZeuthenD-15738 Germany High Performance Computing and Analytics Lab. University of Bonn Endenicher Allee 19A Bonn53115 Germany Department of Mechanical Engineering Frederick University Nicosia1036 Cyprus Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn Bonn53115 Germany Bethe Center for Theoretical Physics University of Bonn Bonn53115 Germany

We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the strange and charm quarks with their mass close to physical. The latter ensemble has large statistics and finer lattice spacing and it is used to obtain final results, while the other two are used for assessing volume effects. The pseudoscalar form factor is also computed using these ensembles. We examine the momentum dependence of these form factors as well as relations based on pion pole dominance and the partially conserved axial-vector current hypothesis. © 2020, CC BY-NC-Nd.

关键词： Approximation theory

Few- and many-nucleon systems with semilocal coordinate-space regularized chiral nucleon-nucleon forces

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arXiv 2018年

作者： Binder, S. Calci, A. Epelbaum, E. Furnstahl, r.J. Golak, J. Hebeler, K. Hüther, T. Kamada, H. Krebs, H. Maris, P. Meißner, Ulf G. Nogga, A. roth, r. Skibinski, r. Topolnicki, K. Vary, J.P. Vobig, K. Wita la, H. Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Physics Division Oak Ridge National Laboratory Oak RidgeTN37831 United States TRIUMF 4004 Wesbrook Mall VancouverBCV6T 2A3 Canada Institut für Theoretische Physik II Ruhr-Universität Bochum BochumD-44780 Germany Department of Physics Ohio State University ColumbusOH43210 United States M. Smoluchowski Institute of Physics Jagiellonian University KrakówPL-30348 Poland Institut für Kernphysik Technische Universität Darmstadt Darmstadt64289 Germany Department of Physics Faculty of Engineering Kyushu Institute of Technology Kitakyushu804-8550 Japan Department of Physics and Astronomy Iowa State University AmesIA50011 United States Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany JARA - High Performance Computing Forschungszentrum Jülich JülichD-52425 Germany

We employ a variety of ab initio methods including Faddeev-Yakubovsky equations, No-Core Configuration Interaction Approach, Coupled-Cluster Theory and In-Medium Similarity renormalization Group to perform a comprehensive analysis of the nucleon-deuteron elastic and breakup reactions and selected properties of light and medium-mass nuclei up to 48Ca using the recently constructed semilocal coordinate-space regularized chiral nucleon-nucleon potentials. We compare the results with those based on selected phenomenological and chiral EFT two-nucleon potentials, discuss the convergence pattern of the chiral expansion and estimate the achievable theoretical accuracy at various chiral orders using the novel approach to quantify truncation errors of the chiral expansion without relying on cutoff variation. We also address the robustness of this method and explore alternative ways to estimate the theoretical uncertainty from the truncation of the chiral expansion. Copyright © 2018, The Authors. All rights reserved.

关键词： Statistical mechanics

density Fluctuations in the Intracluster Medium: An Attempt to Constrain Viscosity with Cosmological Simulations

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arXiv 2024年

作者： Marin-Gilabert, Tirso Steinwandel, Ulrich P. Valentini, Milena Vallés-Pérez, david dolag, Klaus Universitäts-Sternwarte Fakultät für Physik Ludwig-Maximilians-Universität München Scheinerstr.1 München81679 Germany Center for Computational Astrophysics Flatiron Institute 162 5th Avenue New YorkNY10010 United States Astronomy Unit Department of Physics University of Trieste via Tiepolo 11 TriesteI-34131 Italy INAF - Osservatorio Astronomico di Trieste via Tiepolo 11 TriesteI-34131 Italy INFN Instituto Nazionale di Fisica Nucleare Via Valerio 2 TriesteI-34127 Italy ICSC - Italian Research Center on High Performance Computing Big Data and Quantum Computing via Magnanelli 2 Casalecchio di Reno40033 Italy Departament d'Astronomia i Astrofísica Universitat de València C/Doctor Moliner 50 València BurjassotE-46100 Spain Max-Planck-Institut für Astrophysik Karl-Schwarzschild-Straße 1 Garching85741 Germany

The impact of viscosity in the Intracluster Medium (ICM) is still an open question in astrophysics. To address this problem, we have run a set of cosmological simulations of three galaxy clusters with a mass larger than MVir > 1015M☉ at z = 0 using the SPMHd-code OpenGadget3. We aim to quantify the influence of viscosity and constrain its value in the ICM. Our results show significant morphological differences at small scales, temperature variations, and density fluctuations induced by viscosity. We observe a suppression of instabilities at small scales, resulting in a more filamentary structure and a larger amount of small structures due to the lack of mixing with the medium. The conversion of kinetic to internal energy leads to an increase of the virial temperature of the cluster of ∼5% - 10%, while the denser regions remain cold. The amplitude of density and velocity fluctuations are found to increase with viscosity. However, comparison with observational data indicates that the simulations, regardless of the viscosity, match the observed slope of the amplitude of density fluctuations, challenging the direct constraint of viscosity solely through density fluctuations. Furthermore, the ratio of density to velocity fluctuations remains close to 1 regardless of the amount of viscosity, in agreement with the theoretical expectations. Our results show for the first time in a cosmological simulation of a galaxy cluster the effect of viscosity in the ICM, a study that is currently missing in the literature. Copyright © 2024, The Authors. All rights reserved.

关键词： Cosmology

reciprocal skin effect and its realization in a topolectrical circuit

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arXiv 2019年

作者： Hofmann, Tobias Helbig, Tobias Schindler, Frank Salgo, Nora Brzezińska, Marta Greiter, Martin Kiessling, Tobias Wolf, david Vollhardt, Achim Kabaši, Anton Lee, Ching Hua Bilušić, Ante Thomale, ronny Neupert, Titus Institute for Theoretical Physics and Astrophysics University of Würzburg Am Hubland WürzburgD-97074 Germany Department of Physics University of Zurich Winterthurerstrasse 190 Zurich8057 Switzerland Kavli Institute for Theoretical Physics University of California Santa BarbaraCA93106 United States Department of Theoretical Physics Faculty of Fundamental Problems of Technology Wroclaw University of Science and Technology Wroclaw50-370 Poland Physikalisches Institut and Röntgen Research Center for Complex Material Systems Universität Würzburg WürzburgD-97074 Germany Centre of Excellence STIM University of Split Poljička cesta 35 SplitHR-21000 Croatia Department of Physics National University of Singapore Singapore117542 Singapore Institute of High Performance Computing A*STAR Singapore138632 Singapore University of Split Faculty of Science Rudera ¯ Boškovića 33 SplitHR-21000 Croatia

A system is non-Hermitian when it exchanges energy with its environment and non-reciprocal when it behaves differently upon the interchange of input and response. Within the field of metamaterial research on synthetic topological matter, the skin effect describes the conspiracy of non-Hermiticity and non-reciprocity to yield extensive anomalous localization of all eigenmodes in a (quasi) one-dimensional geometry. Here, we introduce the reciprocal skin effect, which occurs in non-Hermitian but reciprocal systems in two or more dimensions: Eigenmodes with opposite longitudinal momentum exhibit opposite transverse anomalous localization. We experimentally demonstrate the reciprocal skin effect in a passive rLC circuit, suggesting convenient alternative implementations in optical, acoustic, mechanical, and related platforms. Skin mode localization brings forth potential applications in directional and polarization detectors for electromagnetic waves. Copyright © 2019, The Authors. All rights reserved.

关键词： Timing circuits

Nucleon axial and pseudoscalar form factors from lattice QCd at the physical point

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Physical review d 2021年第3期103卷 034509-034509页

作者： C. Alexandrou S. Bacchio M. Constantinou P. dimopoulos J. Finkenrath K. Hadjiyiannakou K. Jansen G. Koutsou B. Kostrzewa T. Leontiou C. Urbach Department of Physics University of Cyprus P.O. Box 20537 1678 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia 2121 Cyprus Department of Physics Temple University 1925 N. 12th Street Philadelphia Pennsylvania 19122-1801 USA Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma and Italian National Institute for Nuclear Physics Gruppo Collegato di Parma Parco Area delle Scienze 7/a (Campus) 43124 Parma Italy NIC DESY Platanenallee 6 D-15738 Zeuthen Germany High Performance Computing and Analytics Lab University of Bonn Endenicher Allee 19A 53115 Bonn Germany Department of Mechanical Engineering Frederick University 1036 Nicosia Cyprus Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn 53115 Bonn Germany and Bethe Center for Theoretical Physics University of Bonn 53115 Bonn Germany

关键词： Lattice QCd Quantum chromodynamics Form factors

AN EFFICIENT ALGOrITHM FOr computing THE TrANSMISSION THrOUGH highLY CONdUCTING THIN SHIELdS IN TLM

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INTErNATIONAL JOUrNAL OF NUMErICAL MOdELLING-ELECTrONIC NETWOrKS dEVICES ANd FIELdS 1995年第5期8卷 331-340页

作者： FUCHS, C KOPP, G SCHWAB, AJ Institute of Electric Energy Systems and High-Voltage Technology University of Karlsruhe Kaiserstrasse 12 76128 Karlsruhe Germany Chistophs Fuchs was born in Sinsheim germany in 1967. He received the Dipl.-Ing degree in electrical engineering at the University of Karlsruhe in 1992. In April 1993 he joined the Institute of Electric Energy Systems and High-Voltage Technolgoy. His current research interests include analytical and numerical calculation of electromagnetic fields in EMC applications and high-performance computing. Gerhard Kopp was born in Karlsruhe Germany in 1968. He is studying physics at the University of Karlsruhe and is now working towards his diploma. His thesis deals with numeical calculations of electromagnetic fields. Professor Dr.-Ing. A. J. Schwab graduated in electrical engineering at the Universiyt of Karlsruhe. After receiving his Ph.D. degree he worked as a post-doctoral fellow at MIT in 1970/71. He held appointments at the Universities of Darmstadt and dormund and eventually was appointed EE Full Professor at the University of Karlsruhe. In 1989 he was appointed Director of the ABB Corporate Research Center at Heidelberg Germany. Since 1994 he has worked again as Professor and Director of the Institute for Electric Energy Systems and High-Voltage Technology at the University of Karlsruhe. He is the author of three books on high-voltage measurements electromagnetic compatibility and field theory concepts that have been published in German English Russian an Chinese. He is a member of the German national society of electrical engineers VDE a member of the Conférence Internationale des Grands Réseaux Electriques (CIGRE) Fellow of the IEEE and at present Chairman of the IEEE Germany Section.

This paper presents a new method in TLM for very efficient computation of highly conducting thin shielding walls. Firstly, the impulse response of a finite conducting sheet is computed analytically via inverse Laplace transform. Subsequently, a recursive convolution integral is formulated with the analytical impulse response. This allows a very efficient and accurate calculation of the diffusion process through imperfectly conducting walls.

关键词： Algorithms