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Measuring the Rydberg constant using circular Rydberg atoms in an intensity-modulated optical lattice

Physical Review A 2017年第3期96卷 032513-032513页

作者： Andira Ramos Kaitlin Moore Georg Raithel Department of Physics University of Michigan Ann Arbor Michigan 48105 USA Applied Physics Program University of Michigan Ann Arbor Michigan 48105 USA

A method for performing a precision measurement of the Rydberg constant R∞ using cold circular Rydberg atoms is proposed. These states have long lifetimes as well as negligible quantum electrodynamics and no nuclear-overlap corrections. Due to these advantages, the measurement can help solve the proton radius puzzle [J. C. Bernauer and R. Pohl, Sci. Am. 310, 32 (2014)]. The atoms are trapped using a Rydberg-atom optical lattice and transitions are driven using a recently demonstrated lattice-modulation technique to perform Doppler-free spectroscopy. The circular-state transition frequency yields R∞. Laser wavelengths and beam geometries are selected such that the lattice-induced transition shift is minimized. The selected transitions have no first-order Zeeman and Stark corrections, leaving only manageable second-order Zeeman and Stark shifts. For Rb, the projected relative uncertainty of R∞ in a measurement under the presence of the earth's gravity is 10−11, with the main contribution coming from the residual lattice shift. This could be reduced in a future microgravity implementation. The next-important systematic uncertainty arises from the Rb+ polarizability (relative-uncertainty contribution of ≈3×10−12).

关键词： Atomic spectra Electronic transitions

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Web-Based Comprehensive Assessment for Postpartum Care using Rule-Based Algorithm

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Journal of physics: Conference Series 2019年第1期1179卷

作者： S Mujahidah S Suryono M N Widyawati Department of Midwifery STIKES Karya Husada Semarang Indonesia Postgraduate Program in Applied Midwifery Science Poltekkes Kemenkes Semarang Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Universitas Diponegoro Indonesia

Administration of postpartum care has been performed in line with health care standards. Unfortunately the health service medical record data is still *** results in delays in establishing a diagnosis and providing therapy which results in a worsening of the postpartum mother's *** paper proposes a web-based information system that may become one solution in solving the remaining issues in postpartum care. The system developed here is expected to improve health care quality with better data completion of postpartum mothers and access to them. The system developed here is web-based, in that it applies the rule-based artificial intelligence system. Input of the system are results of physical examination performed by medical professionals. Then processed using the rule-based algorithm to produce diagnosis and proper recommendation. This research is quasi-experimental using posttest only with control group. There were 40 were categorized into intervention group (n=20) who used the information system and control group (n=20) who used the present system endorsed by the government.. The rule-based algorithm in the information system uses validation from experts. Results show that the information system developed here is capable of solving the issue of incomprehensive data, as well as effectiveness in providing postpartum care.

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The effect of additive chemicals on synthesis of bismuth nanoparticles

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Materials Today: Proceedings 2018年第6期5卷 14057-14062页

作者： K. Petsom A. Kopwitthaya M. Horphathum J. Kaewkhao N. Sangwaranatee Center of Excellence in Glass Technology and Materials Science (CEGM) Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand National Electronics and Computer Technology Center Pathum Thani 12120 Thailand Applied Physics Faculty of Science and Technology Suan Sunandha Rajabhat University Bangkok 10300 Thailand

Bismuth nanostructures are of interest due to unique properties such as strong diamagnetism, high magnetoresistance under magnetic field, as well as biocompatibility compared with lead. Previous study have reported a relationship of obtained nanostructures and synthesized conditions including pH, temperature and time during nucleation. Most of them confront difficulties on size controlling, particularly in large volume synthesis. Therefore, the goal of this work is to simplify the synthesis method by studying an effect of additive chemicals which are introduced to a growth solution before nanocrystal formation. Ascorbic acid, dioctyl sulfosuccinate sodium salt (AOT) and ethanol were chosen to slow down the reaction or disturb the micellar template. The study has shown that size of nanoparticles can be easily tuned by adding different amount of aforementioned chemicals. According to different role in nanocrystal forming mechanism, more ascorbic acid tends to increase diameter of obtained particles. Oppositely, more AOT has shrunk synthesized particles due to packed micelles. Loose micelles are found in ethanol experiment leading to bigger particles in size. In addition, crystalline structure exhibited the diffraction plane at (012), (104), and (110) with X-Ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FE-SEM) was used to determine morphology of nanoparticles, and also size distribution was confirmed by nanoparticle tracking analysis (NTA). We also found the quench of nanocrystal formation in the presence of high concentration of ethyl alcohol.

关键词： Ascorbic acid Docusate sodium salt Ethanol Room temperature synthesis

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Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31

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Astronomy and Astrophysics 2025年第1期697卷

作者： Abe, K. Abe, S. Abhir, J. Abhishek, A. Acciari, V.A. Aguasca-Cabot, A. Agudo, I. Aniello, T. Ansoldi, S. Antonelli, L.A. Engels, A. Arbet Arcaro, C. Asano, K. Babić, A. de Almeida, U. Barres Barrio, J.A. Barrios-Jiménez, L. Batković, I. Baxter, J. González, J. Becerra Bednarek, W. Bernardini, E. Bernete, J. Berti, A. Besenrieder, J. Bigongiari, C. Biland, A. Blanch, O. Bonnoli, G. Bošnjak, Ž. Bronzini, E. Burelli, I. Campoy-Ordaz, A. Carosi, A. Carosi, R. Carretero-Castrillo, M. Castro-Tirado, A.J. Cerasole, D. Ceribella, G. Chilingarian, A. Cifuentes, A. Colombo, E. Contreras, J.L. Cortina, J. Covino, S. D’Ammando, F. D’Amico, G. Vela, P. Da Dazzi, F. De Angelis, A. De Lotto, B. de Menezes, R. Delfino, M. Delgado, J. Mendez, C. Delgado Pierro, F. Di Tria, R. Di Venere, L. Di Dinesh, A. Prester, D. Dominis Donini, A. Dorner, D. Doro, M. Eisenberger, L. Elsaesser, D. Escudero, J. Fariña, L. Foffano, L. Font, L. Fröse, S. Fukazawa, Y. López, R.J. García Garczarczyk, M. Gasparyan, S. Gaug, M. Paiva, J.G. Giesbrecht Giglietto, N. Giordano, F. Gliwny, P. Gradetzke, T. Grau, R. Green, D. Green, J.G. Günther, P. Hadasch, D. Hahn, A. Hassan, T. Heckmann, L. Llorente, J. Herrera Hrupec, D. Imazawa, R. Israyelyan, D. Itokawa, T. Martínez, I. Jiménez Quiles, J. Jiménez Jormanainen, J. Kankkunen, S. Kayanoki, T. Kerszberg, D. Khachatryan, M. Kluge, G.W. Kobayashi, Y. Konrad, J. Kouch, P.M. Kubo, H. Kushida, J. Láinez, M. Lamastra, A. Lindfors, E. Lombardi, S. Longo, F. López-Coto, R. Japanese MAGIC Group Department of Physics Tokai University Kanagawa Hiratsuka259-1292 Japan The University of Tokyo Chiba Kashiwa277-8582 Japan ETH Zürich ZürichCH-8093 Switzerland Università di Siena INFN Pisa SienaI-53100 Italy Bellaterra BarcelonaE-08193 Spain Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain RomeI-00136 Italy Università di Udine INFN Trieste UdineI-33100 Italy Max-Planck-Institut für Physik GarchingD-85748 Germany Università di Padova INFN PadovaI-35131 Italy Zagreb10000 Croatia URCA RJ Rio de Janeiro22290-180 Brazil IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain Instituto de Astrofísica de Canarias and Dpto. de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38200 Spain University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Università di Pisa INFN Pisa PisaI-56126 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari BariI-70125 Italy Armenian MAGIC Group A. Alikhanyan National Science Laboratory Yerevan0036 Armenia Department for Physics and Technology University of Bergen Norway INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy Croatian MAGIC Group University of Rijeka Faculty of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany Technische Universität Dortmund DortmundD-44221 Germany Japanese MAGIC Group: Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan ZeuthenD-15738 Germany Armenian MAGIC Gro

Context. Among the blazars whose emission has been detected up to very high-energy (VHE;100 GeV 14 δD cm on the size of the emission region responsible for the γ-ray flare, with δD being the relativistic Doppler factor of the region. During the 2020 high state, the average spectrum became harder in the HE γ-ray band compared to the low states. A similar behavior has been observed in X-rays. Conversely, during different activity periods, we find harder-when-brighter trends in X-rays and a hint of softer-when-brighter trends at HE γ rays. A long-term HE γ-ray and optical correlation indicates that the same emission regions dominate the radiative output in both ranges, whereas the evolution at 15 GHz shows no correlation with the fluxes at higher frequencies. We test one-zone and two-zone synchrotron-self-Compton models for describing the broadband spectral energy distribution during the 2020 flaring state and investigate the self-consistency of the proposed scenario. c The Authors 2025.

关键词： Gamma radiography

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Expression of Concern: Automatic high-resolution microseismic event detection via supervised machine learning

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Geophysical Journal International 2019年第1期221卷 2056-2056页

作者： Shan Qu Zhe Guan Eric Verschuur Yangkang Chen Delft university of technology Departments of Imaging Physics Mekelweg 2 2628 CD Delft Netherlands Rice University Applied Physics Program Houston TX USA School of Earth Sciences Zhejiang University Hangzhou Zhejiang Province 310027 China chenyk2016@***

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Copper-Rich Thermoelectric Sulfides: Size-Mismatch Effect and Chemical Disorder in the [TS4]Cu6 Complexes of Cu26T2Ge6S32 (T=Cr, Mo, W) Colusites

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Advanced Materials 2019年第43期58卷 15601-15609页

作者： Kumar, Ventrapati Pavan Guélou, Gabin Lemoine, Pierric Raveau, Bernard Supka, Andrew R. Orabi, Rabih Al Rahal Al Fornari, Marco Suekuni, Koichiro Guilmeau, Emmanuel CRISMAT CNRS Normandie Univ ENSICAEN UNICAEN Caen14000 France Univ Rennes CNRS ISCR – UMR 6226 Rennes35000 France Department of Physics and Science of Advanced Materials Program Central Michigan University Mt. PleasantMI48859 United States Department of Applied Science for Electronics and Materials Interdisciplinary Graduate School of Engineering Sciences Kyushu University Kasuga Fukuoka816-8580 Japan Solvay Design and Development of Functional Materials Department Axel’One 87 avenue des Frères Perret Saint Fons Cedex69192 France

Herein, we investigate the Mo andWsubstitution for Cr in synthetic colusite, Cu26Cr2Ge6S32. Primarily, we elucidate the origin of extremely low electrical resistivity which does not compromise the Seebeck coefficient and leads to outstanding power factors of 1.94 mWm−1K−2 at 700 K in Cu26Cr2Ge6S32. We demonstrate that the abnormally long iono-covalent T–S bonds competing with short metallic Cu–T interactions govern the electronic transport properties of the conductive „Cu26S32" framework. We address the key role of the cationic size-mismatch at the core of the mixed tetrahedral–octahedral complex over the transport properties. Two essential effects are identified: 1) only the tetrahedra that are directly bonded to the [TS4]Cu6 complex are significantly distorted upon substitution and 2) the major contribution to the disorder is localized at the central position of the mixed tetrahedral–octahedral complex, and is maximized for x=1, i.e. for the highest cationic sizevariance, σ2. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Copper compounds

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Symmetry-controlled second-harmonic generation in a plasmonic waveguide

arXiv

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arXiv 2019年

作者： Chen, Tzu-Yu Obermeier, Julian Schumacher, Thorsten Lin, Fan-Cheng Huang, Jer-Shing Lippitz, Markus Huang, Chen-Bin Institute of Photonics Technologies National Tsing Hua University Hsinchu30013 Taiwan International Intercollegiate PhD Program National Tsing Hua University Hsinchu30013 Taiwan Department of Physics University of Bayreuth Bayreuth95440 Germany Department of Chemistry National Tsing Hua University Hsinchu30013 Taiwan Leibniz Institute of Photonic Technology Jena07745 Germany Department of Electrophysics National Chiao Tung University Hsinchu30010 Taiwan Research Center for Applied Sciences Academia Sinica Taipei115-29 Taiwan

A new concept for second-harmonic generation (SHG) in an optical nanocircuit is proposed. We demonstrate both theoretically and experimentally that the symmetry of an optical mode alone is sufficient to allow SHG even in centro-symmetric structures made of centro-symmetric material. The concept is realized using a plasmonic two-wire transmission-line (TWTL), which simultaneously supports a symmetric and an anti-symmetric mode. We first confirm the generated second-harmonics belong only to the symmetric mode of the TWTL when fundamental excited modes are either purely symmetric or anti-symmetric. We further switch the emission into the anti-symmetric mode when a controlled mixture of the fundamental modes is excited simultaneously. Our results open up a new degree of freedom into the designs of nonlinear optical components, and should pave a new avenue towards multi-functional nanophotonic circuitry. Copyright © 2019, The Authors. All rights reserved.

关键词： Harmonic generation

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Valley-selective optical Stark effect probed by Kerr rotation

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Physical Review B 2018年第4期97卷 045307-045307页

作者： Trevor LaMountain Hadallia Bergeron Itamar Balla Teodor K. Stanev Mark C. Hersam Nathaniel P. Stern Applied Physics Program Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Physics and Astronomy Northwestern University Evanston Illinois 60208 USA Department of Chemistry Northwestern University Evanston Illinois 60208 USA Department of Electrical Engineering and Computer Science Northwestern University Evanston Illinois 60208 USA

The ability to monitor and control distinct states is at the heart of emerging quantum technologies. The valley pseudospin in transition metal dichalcogenide (TMDC) monolayers is a promising degree of freedom for such control, with the optical Stark effect allowing for valley-selective manipulation of energy levels in WS2 and WSe2 using ultrafast optical pulses. Despite these advances, understanding of valley-sensitive optical Stark shifts in TMDCs has been limited by reflectance-based detection methods where the signal is small and prone to background effects. More sensitive polarization-based spectroscopy is required to better probe ultrafast Stark shifts for all-optical manipulation of valley energy levels. Here, we show time-resolved Kerr rotation to be a more sensitive probe of the valley-selective optical Stark effect in monolayer TMDCs. Compared to the established time-resolved reflectance methods, Kerr rotation is less sensitive to background effects. Kerr rotation provides a fivefold improvement in the signal-to-noise ratio of the Stark effect optical signal and a more precise estimate of the energy shift. This increased sensitivity allows for observation of an optical Stark shift in monolayer MoS2 that exhibits both valley and energy selectivity, demonstrating the promise of this method for investigating this effect in other layered materials and heterostructures.

关键词： Dielectric properties Excitons Semiconductors Transition metal dichalcogenides Kerr effect Reflectivity

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Shedding light on topological superconductors

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Physical Review B 2018年第6期98卷 064502-064502页

作者： K. H. A. Villegas V. M. Kovalev F. V. Kusmartsev I. G. Savenko Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34126 Korea A.V. Rzhanov Institute of Semiconductor Physics Siberian Branch of Russian Academy of Sciences Novosibirsk 630090 Russia Department of Applied and Theoretical Physics Novosibirsk State Technical University Novosibirsk 630073 Russia Department of Physics Loughborough University Loughborough LE11 3TU United Kingdom Micro/Nano Fabrication Laboratory Microsystem and THz Research Center Chengdu Sichuan China Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Korea

We propose an effective optical approach to monitor superconductors in a two-layer superconductor-normal metal structure. Effectively, such a hybrid system represents a resonator, where electrons are strongly coupled with light. We show that the interaction of light with the superconductor is strongly boosted in the presence of the neighboring metal and, as a result, the electromagnetic power absorption of the system is dramatically enhanced. It manifests itself in a giant Fano-type resonance which can uniquely characterize the elementary excitations of the system. Our approach is especially promising for topological superconductors, where Majorana fermions could be revealed and controlled by light.

关键词： Superconducting fluctuations Superconducting phase transition Superconducting quantum optics Topological superconductors Heterostructures Low-temperature superconductors Superconductors Unconventional superconductors Methods in superconductivity Optical absorption spectroscopy

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PT phase transitions of edge states at PT symmetric interfaces in non-Hermitian topological insulators

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Physical Review B 2018年第16期98卷 165129-165129页

作者： Xiang Ni Daria Smirnova Alexander Poddubny Daniel Leykam Yidong Chong Alexander B. Khanikaev Department of Electrical Engineering Grove School of Engineering The City College of the City University of New York 140th Street and Convent Avenue New York New York 10031 USA Physics program Graduate Center of the City University of New York New York New York 10016 USA Institute of Applied Physics of the Russian Academy of Sciences Nizhny Novgorod 603950 Russia Nonlinear Physics Centre Research School of Physics and Engineering Australian National University Canberra ACT 2601 Australia ITMO University St. Petersburg 197101 Russia Ioffe Institute St. Petersburg 194021 Russia Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore 637371 Singapore

We demonstrate that the parity-time (PT) symmetric interfaces formed between non-Hermitian amplifying (“gainy”) and lossy topological crystals exhibit PT phase transitions separating phases of lossless and decaying/amplifying topological edge transport. The spectrum of these interface states exhibits exceptional points (EPs) separating (i) a PT symmetric real-valued regime with an evenly distributed wave function in both gainy and lossy domains and (ii) a PT broken complex-valued regime, in which edge states asymmetrically localize in one of the domains. Despite its complex-valued character, the edge spectrum remains gapless and connects complex-valued bulk bands through the EPs. We find that the regimes exist when the real edge spectrum is embedded into the bulk continuum without mixing, indicating that the edge states are protected against leakage into the bulk by the PT symmetry. Two exemplary PT symmetric systems, exhibiting valley and Chern topological phases, respectively, are investigated and the connection with the corresponding Hermitian systems is established. Interestingly, despite the complex bulk spectrum of the Chern insulator, the bulk-interface correspondence principle still holds, as long as the topological gap remains open. The proposed systems are experimentally feasible in photonics, which is evidenced by our rigorous full-wave simulations of PT symmetric silicon-based photonic graphene.

关键词： Band gap Edge states Photonics Topological phases of matter

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