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arXiv 2023年

作者： Aoki, Wako Li, Haining Tominaga, Nozomu Matsuno, Tadafumi Honda, Satoshi Zhao, Gang National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Key Lab of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road Chaoyang Beijing100012 China Department of Physics Faculty of Science and Engineering Konan University 8-9-1 Okamoto Hyogo Kobe658-8501 Japan Kapteyn Astronomical Institute University of Groningen Landleven 12 Groningen9747 AD Netherlands Nishi-Harima Astronomical Observatory Center for Astronomy University of Hyogo 407-2 Nishigaichi Sayo-cho Hyogo Sayo679-5313 Japan

We report on the chemical composition of the very metal-poor ([Fe/H]= −2.9) star LAMOST J1645+4357 that is identified to be a red giant having peculiar abundance ratios by Li et al. (2022). The standard abundance analysis is carried out for this object and the well studied metal-poor star HD 122563 that has similar atmospheric parameters. LAMOST J1645+4357 has a remarkable abundance set, highlighted by these features: (1) Nitrogen is significantly enhanced ([N/Fe]= +1.4) and the total abundance of C and N is also very high ([(C+N)/Fe]=+0.9);(2) α-elements are over-abundant with respect to iron as generally found in very metal-poor stars;(3) Ti, Sc, Co and Zn are significantly deficient;(4) Cr and Mn are enhanced compared to most of very metal-poor stars;(5) Sr and Ba are deficient and the Sr/Ba ratio ([Sr/Ba]= −1.0) is significantly lower than the value expected for the r-process. The overall abundance pattern of this object from C to Zn is well reproduced by a faint supernova model assuming spherical explosion, except for the excess of Cr and Mn which requires enhancement of incomplete Si burning or small contributions of a type Ia supernova or a pair-instability supernova. There remains, however, a question why the abundance pattern of this star is so unique among very metal-poor stars. Copyright © 2023, The Authors. All rights reserved.

关键词： Supernovae

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Coherent Perfect Absorption in Chaotic Optical Microresonators for Efficient Modal Control

arXiv

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arXiv 2022年

作者： Jiang, Xuefeng Yin, Shixiong Li, Huanan Quan, Jiamin Cotrufo, Michele Kullig, Julius Wiersig, Jan Alù, Andrea Photonics Initiative Advanced Science Research Center The City University of New York 85 St. Nicholas Terrace New York10031 United States Department of Electrical Engineering City College The City University of New York 160 Convent Avenue New York10031 United States MOE Key Laboratory of Weak-Light Nonlinear Photonics School of Physics Nankai University Tianjin300071 China Institut für Physik Otto-von-Guericke-Universität Magdeburg Postfach 4120 MagdeburgD-39016 Germany Physics Program The Graduate Center The City University of New York 365 Fifth Avenue New York10016 United States

Non-Hermitian wave engineering has attracted a surge of interest in photonics in recent years. One of the prominent phenomena is coherent perfect absorption (CPA), in which the annihilation of electromagnetic scattering occurs by destructive interference of multiple incident waves. This concept has been implemented in various platforms to demonstrate real-time control of absorption, scattering and radiation by varying the relative phase of the excitation signals. However, so far these studies have been limited to simple photonic systems involving single or few modes at well-defined resonant frequencies. Realizing CPA in more complex photonic systems is challenging because it typically requires engineering the interplay of a large number of resonances featuring large spatial complexity within a narrow frequency range. Here, we extend the paradigm of coherent control of light to a complex photonic system involving more than 1,000 optical modes in a chaotic microresonator. We efficiently model the optical fields within a quasi-normal mode (QNM) expansion, and experimentally demonstrate chaotic CPA states, as well as their non-Hermitian degeneracies, which we leverage to efficiently control the cavity excitation through the input phases of multiple excitation channels. Our results shed light on the universality of non-Hermitian physics beyond simple resonant systems, paving the way for new opportunities in the science and technology of complex nanophotonic systems by chaotic wave interference. Copyright © 2022, The Authors. All rights reserved.

关键词： Real time control

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Observing off-resonance motion of nanomechanical resonators as modal superposition

arXiv

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arXiv 2020年

作者： Esmenda, Joshoua Condicion Aguila, Myrron Albert Callera Wang, Jyh-Yang Lee, Teik-Hui Yang, Chi-Yuan Lin, Kung-Hsuan Chang-Liao, Kuei-Shu Katz, Nadav Kafanov, Sergey Pashkin, Yuri Chen, Chii-Dong Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Racah Institute of Physics Hebrew University Jerusalem91904 Israel Department of Physics Lancaster University LancasterLA1 4YB United Kingdom

Observation of resonance modes is the most straightforward way of studying mechanical oscillations because these modes have maximum response to stimuli. However, a deeper understanding of mechanical motion could be obtained by also looking at modal responses at frequencies in between resonances. In this paper, we present visualisation of the modal response shapes for a mechanical drum driven off-resonance. Furthermore, we describe these transitions through superposition of resonance modes. Copyright © 2020, The Authors. All rights reserved.

关键词： Modal analysis

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Saturable time-varying mirror based on an ENZ material

arXiv

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arXiv 2022年

作者： Tirole, Romain Galiffi, Emanuele Dranczewski, Jakub Attavar, Taran Tilmann, Benjamin Wang, Yao-Ting Huidobro, Paloma A. Alú, Andrea Pendry, John B. Maier, Stefan A. Vezzoli, Stefano Sapienza, Riccardo The Blackett Laboratory Department of Physics Imperial College London LondonSW7 2BW United Kingdom Photonics Initiative Advanced Science Research Center City University of New York 85 St. Nicholas Terrace New YorkNY10031 United States Hybrid Nanosystems Nanoinstitut München Ludwig-Maximilians-Universität München München80539 Germany Instituto de Telecomunicações Instituto Superior Tecnico University of Lisbon Avenida Rovisco Pais 1 Lisboa1049-001 Portugal Physics Program Graduate Center City University of New York New YorkNY10016 United States

We report a switchable time-varying mirror, composed of an ITO-Au bilayer, displaying a tenfold modulation of reflectivity (∆R ≈ 0.6), which saturates for a driving pump intensity Ipump ≈ 100 GW/cm2. Upon interacting with the saturated time-varying mirror, the frequency content of a reflected pulse is extended up to 31 THz, well beyond the pump spectral content (2.8 THz). We interpret the spectral broadening as a progressive shortening of the mirror rise time from 110 fs to sub 30 fs with increasing pump power, which is confirmed by four-wave mixing experiments and partially captured by a linear time-varying model of the mirror. A temporal response unbounded by the pump bandwidth opens new avenues for spectral manipulation from time-varying systems with impact for communication networks, optical switching and computing. © 2022, CC BY.

关键词： Mirrors

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LoVoCCS. II. Weak Lensing Mass Distributions, Red-Sequence Galaxy Distributions, and Their Alignment with the Brightest Cluster Galaxy in 58 Nearby X-ray-Luminous Galaxy Clusters

arXiv

引用

arXiv 2024年

作者： Fu, Shenming Dell'Antonio, Ian Escalante, Zacharias Nelson, Jessica Englert, Anthony Helhoski, Søren Shinde, Rahul Brockland, Julia LaDuca, Philip Larkin, Christelyn Paris, Lucca Weiner, Shane Black, William K. Chary, Ranga-Ram Clowe, Douglas Cooper, M.C. Donahue, Megan Evrard, August Lacy, Mark Lauer, Tod Liu, Binyang McCleary, Jacqueline Meneghetti, Massimo Miyatake, Hironao Montes, Mireia Natarajan, Priyamvada Ntampaka, Michelle Pierpaoli, Elena Postman, Marc Sohn, Jubee Turner, David Umetsu, Keiichi Utsumi, Yousuke Wilson, Gillian NSF's National Optical-Infrared Astronomy Research Laboratory 950 North Cherry Avenue TucsonAZ85719 United States Department of Physics Brown University 182 Hope Street Box 1843 ProvidenceRI02912 United States Department of Physics and Astronomy Brigham Young University N283 ESC ProvoUT84602 United States Infrared Processing and Analysis Center MC 314-6 Caltech 1200 E. California Boulevard PasadenaCA91125 United States Department of Physics and Astronomy Ohio University 1 Ohio University AthensOH45701 United States Department of Physics and Astronomy University of California Irvine IrvineCA United States Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Department of Astronomy University of Michigan Ann ArborMI48109 United States Department of Physics University of Michigan Ann ArborMI48109 United States National Radio Astronomy Observatory 520 Edgemont Road CharlottesvilleVA22903 United States Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China Department of Physics Northeastern University 110 Forsyth St BostonMA02115 United States Osservatorio di Astrofisica e Scienza dello Spazio di Bologna Istituto Nazionale di Astrofisica Via Gobetti 93/3 BolognaI-40129 Italy National Institute for Nuclear Physics viale Berti Pichat 6/2 BolognaI-40127 Italy Nagoya University Nagoya464-8602 Japan Division of Physics and Astrophysical Science Graduate School of Science Nagoya University Nagoya464-8602 Japan The University of Tokyo Chiba277-8583 Japan Instituto de Astrofísica de Canarias c/Vía Láctea s/n Tenerife La LagunaE-38205 Spain Departamento de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38205 Spain Department of Astronomy Yale University 266 Whitney Avenue New HavenCT06511 United States Department of Physics Yale University 217 Prospect Street New HavenCT06520 United States Space Telescope Science Institute BaltimoreMD21218

The Local Volume Complete Cluster Survey (LoVoCCS) is an on-going program to observe nearly a hundred low-redshift X-ray-luminous galaxy clusters (redshifts 0.03 X500c > 1044 erg/s) with the Dark Energy Camera (DECam), capturing data in u, g, r, i, z bands with a 5σ point source depth of approximately 25-26th AB magnitudes. Here, we map the aperture masses in 58 galaxy cluster fields using weak gravitational lensing. These clusters span a variety of dynamical states, from nearly relaxed to merging systems, and approximately half of them have not been subject to detailed weak lensing analysis before. In each cluster field, we analyze the alignment between the 2D mass distribution described by the aperture mass map, the 2D red-sequence (RS) galaxy distribution, and the brightest cluster galaxy (BCG). We find that the orientations of the BCG and the RS distribution are strongly aligned throughout the interiors of the clusters: the median misalignment angle is 19 deg within 2 Mpc. We also observe the alignment between the orientations of the RS distribution and the overall cluster mass distribution (by a median difference of 32 deg within 1 Mpc), although this is constrained by galaxy shape noise and the limitations of our cluster sample size. These types of alignment suggest long-term dynamical evolution within the clusters over cosmic timescales. © 2024, CC BY.

关键词： Dark Matter

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Topology of three-dimensional Dirac semimetals and generalized quantum spin Hall systems without gapless edge modes

arXiv

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arXiv 2020年

作者： Tyner, Alexander C. Sur, Shouvik Puggioni, Danilo Rondinelli, James M. Goswami, Pallab Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University IL60208 United States Northwestern Argonne Institute for Science and Engineering EvanstonIL60208 United States

Usually the quantum spin Hall states are expected to possess gapless, helical edge modes. Are there clean, non-interacting, quantum spin Hall states without gapless, edge modes? We show the generic, n-fold-symmetric, momentum planes of three-dimensional, stable Dirac semi-metals, which are orthogonal to the direction of nodal separation are examples of such generalized quantum spin Hall systems. We demonstrate that the planes lying between two Dirac points and the celebrated Bernevig-Zhang-Hughes model support identical quantized, non-Abelian Berry flux of magnitude 2π. Consequently, both systems exhibit spin-charge separation in response to electromagnetic, π-flux vortex. The Dirac points are identified as the unit-strength, monopoles of SO(5) Berry connections, describing topological quantum phase transitions between generalized, quantum spin Hall and trivial insulators. Our work identifies precise bulk invariant and quantized response of Dirac semimetals and shows that many two-dimensional higher-order topological insulators can be understood as generalized quantum spin Hall systems, possessing gapped edge states. Copyright © 2020, The Authors. All rights reserved.

关键词： Fruits

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Topological scattering singularities and embedded eigenstates for polarization control and sensing applications

arXiv

引用

arXiv 2021年

作者： Sakotic, Zarko Krasnok, Alex Alú, Andrea Jankovic, Nikolina BioSense Institute Research Institute for Information Technologies in Biosystems University of Novi Sad Dr Zorana Djindjica 1a Novi Sad21101 Serbia Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States

Epsilon-near-zero and epsilon near-pole materials enable reflective systems supporting a class of symmetry-protected and accidental embedded eigenstates (EE) characterized by a diverging phase-resonance. Here we show that pairs of topologically protected scattering singularities necessarily emerge from EEs when a non-Hermitian parameter is introduced, lifting the degeneracy between oppositely charged singularities. The underlying topological charges are characterized by an integer winding number and appear as phase vortices of the complex reflection coefficient. By creating and annihilating them, we show that these singularities obey charge conservation, and provide versatile control of amplitude, phase and polarization in reflection, with potential applications for polarization control and sensing. Copyright © 2021, The Authors. All rights reserved.

关键词： Polarization

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LST-1 observations of an enormous flare of BL Lacertae in 2021

arXiv

引用

arXiv 2023年

作者： Nozaki, Seiya Asano, Katsuaki Escudero, Juan Emery, Gabriel Priyadarshi, Chaitanya Abe, K. Abe, S. Aguasca-Cabot, A. Agudo, I. Crespo, N. Alvarez Antonelli, L.A. Aramo, C. Arbet-Engels, A. Arcaro, C. Artero, M. Asano, K. Aubert, P. Baktash, A. Bamba, A. Larriva, A. Baquero Baroncelli, L. de Almeida, U. Barres Barrio, J.A. Batkovic, I. Baxter, J. González, J. Becerra Bernardini, E. Bernardos, M.I. Medrano, J. Bernete Berti, A. Bhattacharjee, P. Biederbeck, N. Bigongiari, C. Bissaldi, E. Blanch, O. Bonnoli, G. Bordas, P. Bulgarelli, A. Burelli, I. Burmistrov, L. Buscemi, M. Cardillo, M. Caroff, S. Carosi, A. Carrasco, M.S. Cassol, F. Cauz, D. Cerasole, D. Ceribella, G. Chai, Y. Cheng, K. Chiavassa, A. Chikawa, M. Chytka, L. Cifuentes, A. Contreras, J.L. Cortina, J. Costantini, H. Dalchenko, M. Dazzi, F. De Angelis, A. de Lavergne, M. de Bony De Lotto, B. De Lucia, M. de Menezes, R. Del Peral, L. Deleglise, G. Delgado, C. Mengual, J. Delgado della Volpe, D. Dellaiera, M. Di Piano, A. Di Pierro, F. Di Pilato, A. Di Tria, R. Di Venere, L. Díaz, C. Dominik, R.M. Prester, D. Dominis Donini, A. Dorner, D. Doro, M. Eisenberger, L. Elsässer, D. Emery, G. Escudero, J. Ramazani, V. Fallah Ferrara, G. Ferrarotto, F. Fiasson, A. Foffano, L. Coromina, L. Freixas Fröse, S. Fukami, S. Fukazawa, Y. Garcia, E. López, R. Garcia Gasbarra, C. Gasparrini, D. Geyer, D. Paiva, J. Giesbrecht Giglietto, N. Giordano, F. Gliwny, P. Godinovic, N. Grau, R. Green, J. Green, D. Gunji, S. Günther, P. Hackfeld, J. Hadasch, D. Hahn, A. Hashiyama, K. Hassan, T. Hayashi, K. Heckmann, L. Heller, M. Llorente, J. Herrera Hirotani, K. Hoffmann, D. Horns, D. Houles, J. Hrabovsky, M. Hrupec, D. Hui, D. Hütten, M. Iarlori, M. Imazawa, R. Inada, T. Inome, Y. Ioka, K. Iori, M. Ishio, K. Martinez, I. Jimenez Jurysek, J. Kagaya, M. Karas, V. Katagiri, H. Kataoka, J. Kerszberg, D. Kobayashi, Y. Kohri, K. Kong, A. Kubo, H. Kushida, J. Lainez, M. Lamanna, G. Lamastra, A. Le Flour, T. Linhoff, M. Longo, F. López-Coto, R. Max-Planck-Institut für Physik Föhringer Ring 6 München80805 Germany Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-ha Chiba Kashiwa277-8582 Japan Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain Aix Marseille Univ CNRS IN2P3 CPPM Marseille France The Barcelona Institute of Science and Technology Campus UAB Bellaterra Barcelona08193 Spain Department of Physics Tokai University Japan Institute for Cosmic Ray Research University of Tokyo Japan Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona IEEC-UB Spain Instituto de Astrofísica de Andalucía-CSIC Spain EMFTEL department IPARCOS Universidad Complutense de Madrid Spain INAF - Osservatorio Astronomico di Roma Italy INFN Sezione di Napoli Italy Max-Planck-Institut für Physik Germany INFN Sezione di Padova Università degli Studi di Padova Italy The Barcelona Institute of Science and Technology Spain LAPP Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS-IN2P3 Annecy France Universität Hamburg Institut für Experimentalphysik Germany Graduate School of Science University of Tokyo Japan Universidad del Azuay Ecuador INAF - Osservatorio di Astrofisica e Scienza dello spazio di Bologna Italy Centro Brasileiro de Pesquisas Físicas Brazil Instituto de Astrofísica de Canarias Departamento de Astrofísica Universidad de La Laguna Spain CIEMAT Spain Department of Physics TU Dortmund University Germany INFN Sezione di Bari Politecnico di Bari Italy INAF - Osservatorio Astronomico di Brera Italy INFN Sezione di Trieste Università degli Studi di Udine Italy University of Geneva Département de physique nucléaire et corpusculaire Switzerland INFN Sezione di Catania Italy Italy Aix Marseille Univ CNRS IN2P3 CPPM France INFN Sezione di Bari Università di Bari Italy INFN Sezione di Torino Italy Palacky University Olomouc Faculty of Science Czech Republic University of Alcalá UAH Spain P

The first prototype of LST (LST-1) for the Cherenkov Telescope Array has been in commissioning phase since 2018 and already started scientific observations with the low energy threshold around a few tens of GeV. In 2021, LST-1 observed BL Lac following the alerts based on multi-wavelength observations and detected prominent gamma-ray flares. In addition to the daily flux variability, LST-1 also detected sub-hour-scale intra-night variability reaching 3–4 times higher than the gamma-ray flux from the Crab Nebula above 100 GeV. In this proceeding, we will report the analysis results of LST-1 observations of BL Lac in 2021, especially focusing on flux variability. © 2023, CC BY.

关键词： Gamma rays

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Bright high-purity quantum emitters in aluminium nitride integrated photonics

arXiv

引用

arXiv 2020年

作者： Lu, Tsung-Ju Lienhard, Benjamin Jeong, Kwang-Yong Moon, Hyowon Iranmanesh, Ava Grosso, Gabriele Englund, Dirk Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Photonics Initiative Advanced Science Research Center and Physics Program Graduate Center City University of New York New YorkNY10031 United States Department of Physics Korea University Seoul02841 Korea Republic of

Solid-state quantum emitters (QEs) are fundamental in photonic-based quantum information processing. There is strong interest to develop high-quality QEs in III-nitride semiconductors because of their sophisticated manufacturing driven by large and growing applications in optoelectronics, high voltage power transistors, and microwave amplifiers. Here, we report the generation and direct integration of QEs in an aluminium nitride-based photonic integrated circuit platform. For individual waveguide-integrated QEs, we measure an off-chip count rate exceeding 6 × 104 counts per second (cps) (saturation rate > 8.6 × 104 cps). In an unpatterned thin-film sample, we measure antibunching with g(2)(0) ~ 0.05 and photon count rates exceeding 8 × 105 cps (saturation rate > 1 × 106 cps). Although spin and detailed optical linewidth measurements are left for future work, these results already show the potential for high-quality QEs monolithically integrated in a wide range of III-nitride device technologies that would enable new quantum device opportunities and industrial scalability. Copyright © 2020, The Authors. All rights reserved.

关键词： III-V semiconductors

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On the bandwidth of singular plasmonic resonators in relation to the Chu limit

arXiv

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arXiv 2021年

作者： Pascale, Mariano Mann, Sander A. Forestiere, Carlo Alù, Andrea Department of Electrical Engineering and Information Technology Università degli Studidi Napoli Federico II via Claudio 21 Napoli80125 Italy Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNewYork10016 United States

Plasmonic nanostructures with singular geometries can exhibit a broadband scattering response that at first glance appears to violate the lower bounds for the radiation quality (Q) factor of small radiators, known as the Chu limit. Here we explore this apparent contradiction, investigating the Q factor of the resonant modes supported by two nearly touching cylinders, and analyze how their fractional bandwidth fares in relation to the Chu limit. We first derive lower bounds for the radiation Q factors of two-dimensional objects of arbitrary cross-section. We then discuss the dissipation and radiation Q factors associated with the plasmonic resonances of a cylinder dimer as a function of its gap size. We show that the radiation Q factor is always larger than the minimum Q and, as long as the peaks in the scattering spectrum are well separated, their bandwidth is equal to the inverse of their Q factor. In the limit of touching cylinders, the resonance spectra transition from discrete to a continuum around an accumulation point, yielding a broadband response for any finite level of material loss. Within any given frequency interval, the response is the result of a multitude of plasmon resonances, each individually obeying the Chu limit. Nevertheless, the connection between the Q factor and the overall bandwidth of the scattering response is lost. Our study sheds light onto the exotic resonant phenomena emerging when plasmonic materials are shaped in singular geometries, and outlines their opportunities and limitations for nanophotonics. Copyright © 2021, The Authors. All rights reserved.

关键词： Nanostructures

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