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arXiv 2023年

作者： Biborski, Andrzej Zegrodnik, Michal Wójcik, Pawel Nowak, Michal P. Academic Centre for Materials and Nanotechnology AGH University of Krakow Al. Mickiewicza 30 Krakow30-059 Poland Faculty of Physics and Applied Computer Science AGH University of Krakow Al. Mickiewicza 30 Krakow30-059 Poland

We study theoretically the electronic properties of the artificial quantum dot honeycomb lattice defined in a two-dimensional electron gas, focusing on the possibility of achieving a regime in which electronic correlations play a dominant role. At first we establish a non-interacting model compatible with recently studied experimentally devices. According to the values of the obtained electron-electron interaction integrals, we postulate that the inclusion of inherent electron-gas self-screening is indispensable to reconstruct the experimental observations. Applying the Thomas-Fermi type of screening, we show that the radius of the anti-dot is crucial to achieve a correlated state in which phenomena like antiferromagentic ordering and interaction-induced insulating state appear. We estimate the conditions for which the electronically correlated state in an artificial honeycomb lattice can be realized. © 2023, CC BY.

关键词： Electron-electron interactions

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Scaling properties of elastic pp cross-section 31

Scaling properties of elastic pp cross-section

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31st International Workshop on Deep Inelastic Scattering, DIS 2024

作者： Praszalowicz, Michal Baldenegro, Cristian Royon, Christophe Staśto, Anna M. Institute of Theoretical Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University S. Lojasiewicza 11 Kraków30-348 Poland Dipartimento di Fisica Sapienza Universitá di Roma Piazzale Aldo Moro 2 Rome00185 Italy Department of Physics and Astronomy The University of Kansas LawrenceKS66045 United States Department of Physics Penn State University University ParkPA16802 United States

We show that the elastic differential pp cross-section has a unique universal property that the ratio of bump-to-dip position is constant from the energies of the ISR to the LHC. We explore this property to compare Geometric Scaling present at the ISR with the recently proposed scaling law at the LHC. We argue that at the LHC, within present experimental uncertainties, there is fact a family of scaling laws. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

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Effect of Magnetism on Lattice Vibrations: Mössbauer Spectroscopic Evidence

arXiv

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arXiv 2022年

作者： Dubiel, Stanislaw M. Faculty of Physics and Applied Computer Science Academic Center for Materials and Nanotechnology AGH University of Science and Technology KrakówPL-30-059 Poland

Based on the available literature reviewed are results pertinent to the effect of magnetism on lattice dynamics obtained by Mössbauer spectroscopy at 57Fe and 119Sn probe atoms. Presented and discussed are sigma-phase Fe-Cr, Fe-V, Fe-Cr-Ni and λ-phase (C14 Laves) NbFe2 compounds that belong to the Frank-Kasper family of phases, metallic chromium and iron mono-arsenide, FeAs. The common feature of all these metallic systems is itinerant character of their magnetism. Two spectral parameters relevant to the lattice dynamics viz. the center shift, CS, and/or the recoil-free fraction, f, are considered as figures of merit. Their temperature dependences show anomalies at magnetic ordering temperatures giving evidence that that vibrations in the magnetic phase are different than those in the paramagnetic phase. The lower the magnetic ordering temperature, the stronger the difference. Copyright © 2022, The Authors. All rights reserved.

关键词： Ternary alloys

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Deep Reinforcement Learning-Based Robust Design for an IRS-Assisted MISO-NOMA System

IEEE Transactions on Machine Learning in Communications and ...

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IEEE Transactions on Machine Learning in Communications and Networking 2024年 2卷 424-441页

作者： Waraiet, Abdulhamed Cumanan, Kanapathippillai Ding, Zhiguo Dobre, Octavia A. University of York School of Physics Engineering and Technology YorkYO10 5DD United Kingdom Khalifa University Department of Computer and Communication Engineering Abu Dhabi United Arab Emirates Memorial University Faculty of Engineering and Applied Science St. John'sNLA1C 5S7 Canada

In this paper, we propose a robust design for an intelligent reflecting surface (IRS)-assisted multiple-input single output non-orthogonal multiple access (NOMA) system. By considering channel uncertainties, the original robust design problem is formulated as a sum-rate maximization problem under a set of constraints. In particular, the uncertainties associated with reflected channels through IRS elements and direct channels are taken into account in the design and they are modelled as bounded errors. However, the original robust problem is not jointly convex in terms of beamformers at the base station and phase shifts of IRS elements. Therefore, we reformulate the original robust design as a reinforcement learning problem and develop an algorithm based on the twin-delayed deep deterministic policy gradient agent (also known as TD3). In particular, the proposed algorithm solves the original problem by jointly designing the beamformers and the phase shifts, which is not possible with conventional optimization techniques. Numerical results are provided to validate the effectiveness and evaluate the performance of the proposed robust design. In particular, the results demonstrate the competitive and promising capabilities of the proposed robust algorithm, which achieves significant gains in terms of robustness and system sum-rates over the baseline deep deterministic policy gradient agent. In addition, the algorithm has the ability to deal with fixed and dynamic channels, which gives deep reinforcement learning methods an edge over hand-crafted convex optimization-based algorithms. © 2023 CCBY.

关键词： Heuristic algorithms

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Scaled tight binding model for a two dimensional electron gas at the (001) LaAlO3/SrTiO3 interface

arXiv

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arXiv 2024年

作者： Wójcik, Pawel Citro, Roberta Szafran, Bartlomiej AGH University of Krakow Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland Physics Department E. R. Caianiello' and CNR-SPIN Università degli Studi di Salerno SA Fisciano Italy

The progress in the fabrication of nanoscale systems based on the two-dimensional electron gas at the interface between LaAlO3 and SrTiO3 (LAO/STO) has created an increased demand for simulations of these nanostructures, which typically range in size from tens to hundreds of nanometers. Due to the low lattice constant of LAO/STO, approximately 0.394 nm, these calculations become extremely time-consuming. Here, we present a scaled tight-binding approximation defined on a mesh with size that can be several times larger than in the ordinary approach. The scaled model is analyzed within the context of quantum transport simulations and electronic structure calculations. Our findings demonstrate that the scaled model closely aligns with the ordinary one up to a scaling factor of 8. These results pave the way for more efficient simulations of LAO/STO nanostructures with realistic sizes relevant to experimental applications. © 2024, CC BY.

关键词： Electron gas

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High Efficiency and Optically Transparent 2D-MoS2 Heaters for Silicon Photonics

High Efficiency and Optically Transparent 2D-MoS2 Heaters fo...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Oz, Dor Suleymanov, Nathan Minkovich, Boris Kostianovskii, Vladislav Gantz, Liron Polyushkin, Dmitry Mueller, Thomas Goykhman, Ilya Institute of Applied Physics The Faculty of Science The Center for Nanoscience and Nanotechnology The Hebrew University of Jerusalem Jerusalem91904 Israel Department of Electrical and Computer Engineering Technion Haifa320003 Israel NVIDIA Israel Ltd. Yokneam Israel Institute of Photonics Vienna University of Technology Vienna Austria

We experimentally demonstrate the first 1L-MoS2 microheater integrated with a silicon MRR, showing the best-reported power efficiency of ~7.5 mW/π with no significant penalty on insertion loss when placed close to th... 详细信息

关键词： Silicon photonics

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Acceptance dependence of factorial cumulants, long-range correlations, and the antiproton puzzle

arXiv

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arXiv 2025年

作者： Bzdak, Adam Koch, Volker Vovchenko, Volodymyr AGH University of Krakow Faculty of Physics and Applied Computer Science Kraków30-059 Poland Nuclear Science Division Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States Physics Department University of Houston 3507 Cullen Blvd HoustonTX77204 United States

We analyze joint factorial cumulants of protons and antiprotons in relativistic heavy-ion collisions and point out that they obey the scaling (Formula presented) as a function of acceptance when only long-range correlations are present in the system, such as global baryon conservation and volume fluctuations. This hypothesis can be directly tested experimentally without the need for corrections for volume fluctuations. We show that if correlations among protons and antiprotons are driven by global baryon conservation and volume fluctuations only, the equality (Formula presented) holds for large systems created in central collisions. We point out that the experimental data of the STAR Collaboration from phase I of RHIC beam energy scan are approximately consistent with the scaling (Formula presented), but the normalized antiproton correlations are stronger than that of protons, (Formula presented)2, indicating that global baryon conservation and volume fluctuations alone cannot explain the data. We also discuss high-order factorial cumulants which can be measured with sufficient precision within phase II of RHIC-BES. Copyright © 2025, The Authors. All rights reserved.

关键词： Heavy ions

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Application of Graphs for Story Generation in Video Games 21

Application of Graphs for Story Generation in Video Games

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2021 Australasian computer science Week Multiconference, ACSW 2021

作者： Grabska-Gradzińska, Iwona Nowak, Leszek Palacz, Wojciech Grabska, Ewa Jagiellonian University Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Poland

ISBN: (纸本)9781450389563

The paper presents the system based on the layered hierarchical graphs for game plot description implemented in Godot Engine using the JSON format. The aim of the presented research is to create a tool that both supports the decision-making process and helps multiple writers to collaborate in creating a game world. Constructing a layered hierarchical graph provides information about game plot description, while the proposed graph generation system based on JSON data format allows designers and story writers to create game worlds. A key feature of the graph generation system is that it describes game worlds using a sequence of generation rules which represent the player's actions. On the one hand, the proposed approach helps the story writers to control the impact of the created story elements on the game world. On the other hand, it allows world designers to use procedural generation of narration chains, analyze and test the designed game plots. An additional goal of this approach strongly focused on using the JSON data format to describe actions that can be taken in world states is the impact of JSON data structures on the application of graph rules, which may be important in the problems of artificial intelligence. © 2021 ACM.

关键词： Decision making

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Impact of Time Resolution and Window Length on the Capture of Frequency Variations and Events

Impact of Time Resolution and Window Length on the Capture o...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Boštjan Polajžer Younes Mohammadi Amin Saremi Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia Department of Applied Physics and Electronics Umeå University Umeå Sweden

ISBN: (数字)9798350390421

ISBN: (纸本)9798350390438

Power-quality standards provide limited guidance on frequency quality for short time scales, such as less than one hour. Capturing frequency variations and events requires high time resolutions, e.g., 0.1 seconds or less, resulting in significant data storage requirements. However, power-quality monitors typically report averaged values at intervals of 10 minutes, 15 minutes, or one hour, depending on the disturbance type. To address these challenges, we propose calculating statistic indices from high-resolution data within a 15-minute or one-hour window length, thus avoiding storing high-resolution data. We apply the basic statistic indices to frequency data measured in Finland for a single day in June 2023, demonstrating their effectiveness in capturing frequency variations and two significant events during that day.

关键词： Time-frequency analysis Power quality Stability criteria Europe Power system stability Frequency measurement Smart grids Reliability Standards Monitoring

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High Efficiency and Optically Transparent 2D-MoS2 Heaters for Silicon Photonics

High Efficiency and Optically Transparent 2D-MoS2 Heaters fo...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Oz, Dor Suleymanov, Nathan Minkovich, Boris Kostianovskii, Vladislav Gantz, Liron Polyushkin, Dmitry Mueller, Thomas Goykhman, Ilya Institute of Applied Physics The Faculty of Science The Center for Nanoscience and Nanotechnology The Hebrew University of Jerusalem Jerusalem91904 Israel Department of Electrical and Computer Engineering Technion Haifa320003 Israel NVIDIA Israel LTD. Yokneam Israel Institute of Photonics Vienna University of Technology Vienna Austria

ISBN: (纸本)9781957171395

关键词： Silicon photonics

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