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A revisit on the hydrogen atom induced by a uniform static electric field

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arXiv 2023年

作者： Anh-Tai, Tran Duong Khang, Le Minh Vy, Nguyen Duy Truong, Thu D.H. Pham, Vinh N.T. Department of Physics Ho Chi Minh City University of Education Ho Chi Minh City Viet Nam Quantum Systems Unit OIST Graduate University Onna Okinawa904-0495 Japan Laboratory of Applied Physics Science and Technology Advanced Institute Van Lang University Ho Chi Minh City Viet Nam Faculty of Applied Technology School of Technology Van Lang University Ho Chi Minh City Viet Nam Postgraduate Studies Office Ho Chi Minh City University of Education Ho Chi Minh City Viet Nam

In this paper, we revisit the Stark effect of the hydrogen atom induced by a uniform static electric field. In particular, a general formula for the integral of associated Laguerre polynomials was derived by applying the method for Hermite polynomials of degree n proposed in the work [Anh- Tai T.D. et al., 2021 AIP Advances 11 085310]. The quadratic Stark effect is obtained by applying this formula and the time-independent non-degenerate perturbation theory to hydrogen. Using the Siegert State method, numerical calculations are performed and serve as data for benchmarking. The comparisons are then illustrated for the ground and some highly excited states to provide an insightful look at the applicable limit and precision of the quadratic Stark effect formula for other atoms with comparable properties. © 2023, CC BY.

关键词： Polynomials

Observation of high-energy neutrinos from the Galactic plane

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science 2023年第6652期380卷 1338-1343页

作者： Fei Huang Department of Physics Loyola University Chicago Chicago IL 60660 USA. Deutsches Elektronen-Synchrotron D-15738 Zeuthen Germany. Department of Physics and Astronomy University of Canterbury Private Bag 4800 Christchurch New Zealand. Université Libre de Bruxelles Science Faculty CP230 B-1050 Brussels Belgium. Niels Bohr Institute University of Copenhagen DK-2100 Copenhagen Denmark. Oskar Klein Centre and Department of Physics Stockholm University SE-10691 Stockholm Sweden. Department of Physics TU Dortmund University D-44221 Dortmund Germany. Karlsruhe Institute of Technology Institute for Astroparticle Physics D-76021 Karlsruhe Germany. Bartol Research Institute and Department of Physics and Astronomy University of Delaware Newark DE 19716 USA. Department of Physics Marquette University Milwaukee WI 53201 USA. Department of Physics and Astronomy Uppsala University Box 516 S-75120 Uppsala Sweden. Erlangen Centre for Astroparticle Physics Friedrich-Alexander-Universität Erlangen-Nürnberg D-91058 Erlangen Germany. Department of Physics and Laboratory for Particle Physics and Cosmology Harvard University Cambridge MA 02138 USA. Department of Physics and Wisconsin IceCube Particle Astrophysics Center University of Wisconsin–Madison Madison WI 53706 USA. Department of Physics Massachusetts Institute of Technology Cambridge MA 02139 USA. Physics Department South Dakota School of Mines and Technology Rapid City SD 57701 USA. Department of Physics and Astronomy University of California Irvine CA 92697 USA. Department of Physics University of California Berkeley CA 94720 USA. Department of Astronomy Ohio State University Columbus OH 43210 USA. Department of Physics and Center for Cosmology and Astro-Particle Physics Ohio State University Columbus OH 43210 USA. Department of Physics University of Wuppertal D-42119 Wuppertal Germany. Fakultät für Physik & Astronomie Ruhr-Universität Bochum D-44780 Bochum Germany. Physik-department Technische Unive

The origin of high-energy cosmic rays, atomic nuclei that continuously impact Earth's atmosphere, is unknown. Because of deflection by interstellar magnetic fields, cosmic rays produced within the Milky Way arrive at Earth from random directions. However, cosmic rays interact with matter near their sources and during propagation, which produces high-energy neutrinos. We searched for neutrino emission using machine learning techniques applied to 10 years of data from the IceCube Neutrino Observatory. By comparing diffuse emission models to a background-only hypothesis, we identified neutrino emission from the Galactic plane at the 4.5s level of significance. The signal is consistent with diffuse emission of neutrinos from the Milky Way but could also arise from a population of unresolved point sources.

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Magnon interactions in a moderately correlated Mott insulator

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arXiv 2023年

作者： Wang, Qisi Mustafi, S. Fogh, E. Astrakhantsev, N. He, Z. Bialo, I. Chan, Ying Martinelli, L. Horio, M. Ivashko, O. Shaik, N.E. von Arx, K. Sassa, Y. Paris, E. Fischer, M.H. Tseng, Y. Christensen, N.B. Galdi, A. Schlom, D.G. Shen, K.M. Schmitt, T. Rønnow, H.M. Chang, J. Department of Physics The Chinese University of Hong Kong Shatin Hong Kong Physik-Institut Universität Zürich Winterthurerstrasse 190 ZürichCH-8057 Switzerland LausanneCH-1015 Switzerland Beijing100049 China Dongguan523803 China AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow30-059 Poland Department of Applied Physics KTH Royal Institute of Technology StockholmSE-106 91 Sweden Swiss Light Source Paul Scherrer Institut PSI VilligenCH-5232 Switzerland Department of Physics Technical University of Denmark Kongens LyngbyDK-2800 Denmark Dipartimento di Ingegneria Industriale Universita' degli Studi di Salerno SA Fisciano84084 Italy Department of Materials Science and Engineering Cornell University IthacaNY14850 United States Kavli Institute Cornell for Nanoscale Science IthacaNY14853 United States Department of Physics Laboratory of Atomic and Solid State Physics Cornell University IthacaNY14853 United States

Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO2, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La2CuO4 indicate that quantum fluctuations are much stronger in SrCuO2 suggesting closer proximity to a magnetic quantum critical point. Monte Carlo calculations reveal that other magnetic orders may compete with the antiferromagnetic Néel order as the ground state. Our results indicate that SrCuO2-due to strong quantum fluctuations-is a unique starting point for the exploration of novel magnetic ground states. Copyright © 2023, The Authors. All rights reserved.

关键词： Strontium compounds

Genetically Engineered Nanocapsules with Fluorescent and Magnetic Markers for Cell Tracking and Targeted Drug Delivery

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Genetically Engineered Nanocapsules with Fluorescent and Mag...

International Conference on Laser Optics

作者： A.N. Gabashvili D.D. Namestnikova I.L. Gubskiy S.S. Vodopyanov M.V. Efremova P.I. Makarevich V.A. Sarkisova P.I. Nikitin Prokhorov General Physics Institute of the Russian Academy of Sciences Moscow Russia Department of Neurology Neurosurgery and Medical Genetics RSMU Moscow Russia Department of Microbiology & Immunology Albert Einstein College of Medicine New York City United States Department of Applied Physics and Science Education Eindhoven University of Technology Eindhoven Netherlands Faculty of Medicine Lomonosov Moscow State University Moscow Russia Cell Proliferation Laboratory Engelhardt Institute of Molecular Biology RAS Moscow Russia

ISBN: (数字)9798350390674

ISBN: (纸本)9798350390681

Different functionalized nanocarriers are currently being intensively studied for various theranostic applications. Joining the approaches of genetic and chemical engineering novel carriers have been produced based on encapsulins, which are capsid-like protein structures, consisting of a shell and various payload inside. A number of promising applications of targeted encapsulins with optically and magnetically detectable labels were developed.

关键词： Proteins Integrated optics Targeted drug delivery Target tracking Lasers Chemical engineering Fluorescence

ESTIMATION OF 511 keV GAMMA SCATTER FRACTION IN WLS LAYER IN TOTAL-BODY J-PET;A SIMULATION STUDY

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Acta Physica Polonica B, Proceedings Supplement

Acta Physica Polonica B, Proceedings Supplement 2022年第4期15卷

作者： Ardebili, K. Tayefi Niedzwiecki, S. Moskal, P. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 30-348 Kraków Poland and Center for Theranostics Kopernika 40 31-034 Kraków Poland and Total-Body Jagiellonian-PET Laboratory Jagiellonian University Lojasiewicza 11 30-348 Kraków Poland

Positron emission tomography (PET) is essential in medical diagnostics and monitoring therapy. The J-PET Collaboration at Jagiellonian University is developing a new generation of Total-Body PET scanners based on plastic scintillators. One of the Total-Body J-PET designs comprises seven rings, each consisting of 24 modules. A single module is built of 2 layers, each comprises of 16 axially arranged plastic scintillator strips of 330 mm length, read out by silicon photomultiplier (SiPM) arrays from both ends, and an additional layer of 50 wavelength shifter (WLS) bars, placed perpendicular to plastic layers. This study estimates the scatter fraction of the Total-Body J-PET manufactured from plastic scintillator strips according to the NEMA NU 2-2018 standards by using the GATE software. The scatter phantom was simulated as a solid cylinder with a length of 700 mm and an outside diameter equal to 203 mm. At the same time, at a radial distance of 45 mm, we have a hole with a diameter of 6.4 mm where a linear source with total activity of 1 MBq is placed. For data processing, sinograms were generated, and the Single Slice Rebinning (SSRB) algorithm was used for the scatter fraction calculation. As a result, we estimate that addition of the WLS layer is increasing the scatter fraction by 0.67%. © 2022 Jagellonian University. All rights reserved.

关键词： Cylinders (shapes)

Constructing a Cryptocurrency-Price Prediction Model Using Deep Learning

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Constructing a Cryptocurrency-Price Prediction Model Using D...

International Conference on Engineering and Emerging Technologies (ICEET)

作者： Toai Kim Tran Thanh Thi Tuyet Le Thinh Tien Bui Vang Quang Dang Roman Senkerik Faculty of Economics Ho Chi Minh City University of Technology and Education No 1 Vo Van Ngan Street Linh Chieu Ward Thu Duc City Vietnam Dept. of Computer Science Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava 17. Listopadu 2172/15 Ostrava-Poruba Czech Repulic Faculty of Applied Informatics Tomas Bata University in Zlin T. G. Masaryka 5555 Zlin Czech Republic

ISBN: (纸本)9781665491075

The purpose of this study is to discover the optimal Deep Learning model for Bitcoin prediction among the Convolutional Neural Network (CNN), Recurrent Neural Network (RNN), and Long Short-Term Memory (LSTM). Our empirical results indicate that LSTM is the optimal model for predicting Bitcoin price and trend with the prediction accuracy of 88.9%. Our study serves as a stepping stone for novice cryptocurrency investors and future studies of more advanced and sophisticated algorithms. Finally, given that the ideal model for predicting the price of cryptocurrencies is still a topic of controversy, the findings of this study will serve as a valuable empirical resource for future studies.

关键词： Deep learning Recurrent neural networks Bitcoin Predictive models Prediction algorithms Market research Convolutional neural networks

Superconducting dome with extended s-wave pairing symmetry in the heavily hole-overdoped copper-oxide planes

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arXiv 2021年

作者： Zegrodnik, Michal Wójcik, P. Spalek, J. Academic Centre for Materials and Nanotechnology AGH University of Science and Technology Al. Mickiewicza 30 Krakow30-059 Poland AGH University of Science and Technology Faculty of Physics and Applied Computer science Al. Mickiewicza 30 Krakow30-059 Poland Institute of Theoretical Physics Jagiellonian University ul. Lojasiewicza 11 Krakow30-348 Poland

We analyze the two-orbital (with dx²−y² and d3z²−r² orbitals) analogue of the t-J-U model as applied to the description of the copper-oxide monolayer deposited on the Bi2Sr2CaCu2O8+δ substrate (CuO2/BSCCO). We show, that an extended s-wave superconducting dome appears in the heavily hole overdoped regime of the model, with dominant contribution to the pairing coming from the d3z²−r² orbitals. Also, the lower critical doping for the appearance of the SC state concurs with the Lifshitz Transition after which the hole-like Fermi pockets are created around the M points in the Brillouin zone. The obtained results are in accord with the recent experimental result [cf. Y. Zhong et al., Sci. Bull. 61, 1239 (2016)]. An analogous two-band description is also analyzed in the context of the Ba₂CuO₄−y bulk compound, where the heavily hole-overdoped situation is believed to be reached [cf. W. M. Li et al. PNAS 116, 12156 (2019)]. As we show, a two dome structure can be realized in such system with the d- and s-wave symmetries of the gap corresponding to the low hole-doping and heavily hole overdoped cases, respectively. © 2021, CC BY.

关键词： Copper oxides

Reducing Current Leakage Losses Through Hybrid Interconnecting Layers for Efficient Perovskite-Silicon Tandem Solar Cells With 81.8% Fill Factor

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SSRN

SSRN 2024年

作者： Wang, Yousheng Zheng, Jianzha Ning, Dan Li, Yang Ma, Qiaoyan Liu, Liming Yang, Peng He, Wujie Yang, Huidong Duan, Weiyuan Zhu, Hongbing Chen, Shi Lambertz, Andreas Ding, Kaining Mai, Yaohua Institute of New Energy Technology College of Information Science and Technology Jinan University Guangzhou510632 China Institute of Applied Physics and Materials Engineering University of Macau Macao SAR Macao999078 China IEK–5 Photovoltaik Forschungszentrum Jülich GmbH Jülich52425 Germany Faculty of Intelligent Manufacturing Wuyi University Jiangmen529000 China Guangdong Mellow Energy Co. Ltd. Guangzhou510630 China

To break through the Shockley–Queisser limit of single–junction solar cells, monolithic two–terminal perovskite–silicon tandem solar cells have played a promising role in recent years. The self–assembled monolayer (SAM) is highly favorable as the interconnecting layer (ICL) for efficient perovskite–silicon tandem devices due to its negligible optical– and electrical–loss ability. However, the inhomogeneity of SAM results in defects at the interface between SAM and transparent–conductive oxide (TCO). Here, to solve such issues, we employed the sputtered nickel oxide (NiOx) as the seed layer of MeO–2PACz SAM to build the hybrid ICLs in perovskite–silicon tandem solar cells. It was found that the hybrid ICLs NiOx/MeO–2PACz significantly reduce the current leakage and non-radiative recombination loss. As a result, we can fabricate highly reproducible monolithic 2–T perovskite–silicon tandem solar cells with a PCE of 28.47% and impressive fill factor (FF) of 81.8%, one of the highest FF values reported so far. © 2024, The Authors. All rights reserved.

关键词： Perovskite

Radio-Frequency Pseudo-Null Induced by Light in an Ion Trap

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arXiv 2025年

作者： Chung, Daun Cha, Yonghwan Shon, Hosung Park, Jeonghyun Lee, Woojun Lee, Kyungmin Cho, Beomgeun Choi, Kwangyeul Kim, Chiyoon Yoo, Seungwoo Kim, Suhan Jeong, Uihwan Kang, Jiyong You, Jaehun Kim, Taehyun Dept. of Computer Science and Engineering Seoul National University Seoul08826 Korea Republic of Automation and Systems Research Institute Seoul National University Seoul08826 Korea Republic of NextQuantum Seoul National University Seoul08826 Korea Republic of Institute of Computer Technology Seoul National University Seoul08826 Korea Republic of Inter-University Semiconductor Research Center Seoul National University Seoul08826 Korea Republic of Institute of Applied Physics Seoul National University Seoul08826 Korea Republic of

In a linear radio-frequency (rf) ion trap, the rf null is the point of zero electric field in the dynamic trapping potential where the ion motion is approximately harmonic. When displaced from the rf null, the ion is superimposed by fast oscillations known as micromotion, which can be probed through motion-sensitive light-atom interactions. In this work, we report on the emergence of the rf pseudo-null, a locus of points where the ion responds to light as if it were at the true rf null, despite being displaced from it. The phenomenon is fully explained by accounting for the general two-dimensional structure of micromotion and is experimentally verified under various potential configurations, with observations in great agreement with numerical simulations. The rf pseudo-null manifests as a line in a two-dimensional parameter space, determined by the geometry of the incident light and its overlap with the motional structure of the ion. The true rf null occurs uniquely at the concurrent point of the pseudo-null lines induced by different light sources. © 2025, CC BY.

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