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Scanning gate microscopy of nonretracing electron-hole trajectories in a normal-superconductor junction

Physical Review B 2024年第11期109卷 115410-115410页

作者： S. Maji K. Sowa M. P. Nowak AGH University of Krakow Academic Centre for Materials and Nanotechnology al. A. Mickiewicza 30 30-059 Krakow Poland AGH University of Krakow Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 30-059 Krakow Poland

We theoretically study scanning gate microscopy (SGM) of electron and hole trajectories in a quantum point contact (QPC) embedded in a normal-superconductor (NS) junction. At zero voltage bias, the electrons and holes transported through the QPC form angular lobes and are subject to self-interference, which marks the SGM conductance maps with interference fringes analogously as in normal systems. We predict that for an NS junction at nonzero bias, a beating pattern is to occur in the conductance probed with the use of the SGM technique owing to a mismatch of the Fermi wave vectors of electrons and holes. Moreover, the SGM technique exposes a pronounced disturbance in the angular conductance pattern, as the retroreflected hole does not retrace the electron path due to wave vector difference.

关键词： Quantum transport Superconducting devices Bogoliubov-de Gennes equations S-matrix method in transport Scanning probe microscopy

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Effect of transverse momentum conservation and flow on symmetric cumulants sc2,3 {4} and sc2,3,4 {6}

arXiv

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arXiv 2025年

作者： Pei, Jia-Lin Ma, Guo-Liang Bzdak, Adam Institute of Modern Physics Fudan University Shanghai200433 China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai200438 China AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków30-059 Poland

Symmetric cumulants can improve our understanding of the joint probability distribution function P (vm, vn, vk, . . ., Ψm, Ψn, Ψk, . . .), potentially offering new insights into the nature of the fluctuations of the quark-gluon plasma produced in relativistic heavy-ion collisions. In this work, the four-particle symmetric cumulants sc2,3 {4}, six-particle symmetric cumulants sc2,3,4 {6}, and the normalized cumulants nsc2,3 {4} and nsc2,3,4 {6} originating from transverse momentum conservation, collective flow, and the interplay between the two effects are calculated. Our results are consistent with the ATLAS data using the subevent cumulant method and the simulations using the realistic Monte Carlo models of iEBE-VISHNU and HIJING, facilitating a more profound understanding of the origins of these symmetric cumulants in small systems. © 2025, CC BY.

关键词： Distribution functions

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K-Banhatti Invariants Empowered Topological Investigation of Bridge Networks

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computers, Materials & Continua 2022年第12期73卷 5423-5440页

作者： Khalid Hamid Muhammad Waseem Iqbal Erssa Arif Yasir Mahmood Ahmad Salman Khan Nazri Kama Azri Azmi Atif Ikram Department of Computer Science Superior UniversityLahore54000Pakistan Department of Software Engineering Superior UniversityLahore54000Pakistan Department of Software Engineering Faculty of Information TechnologyThe University of Lahore54000Pakistan Advanced Informatics Department Razak Faculty of Technology and InformaticsUniversiti Teknologi MalaysiaKuala Lumpur54100Malaysia Faculty of Informatics and Applied Mathematics University Malaysia TerengganuMalaysia Department of Computer Science&Information Technology Faculty of Information TechnologyThe University of Lahore54000Pakistan

Any number that can be uniquely determined by a graph is called graph *** the most recent twenty years’innumerable numerical graph invariants have been described and used for correlation *** the fast and advanced environment of manufacturing of networks and other products which used different networks,no dependable assessment has been embraced to choose,how much these invariants are connected with a network graph or molecular *** this paper,it will talk about three distinct variations of bridge networks with great capability of expectation in the field of computer science,chemistry,physics,drug industry,informatics,and mathematics in setting with physical and synthetic constructions and networks,since K-Banhatti invariants are newly introduced and have various forecast characteristics for various variations of bridge graphs or *** review settled the topology of bridge graph/networks of three unique sorts with three types of K-Banhatti *** concluded outcomes can be utilized for the modeling of interconnection networks of Personal computers(PC),networks like Local area network(LAN),Metropolitan area network(MAN)and Wide area network(WAN),the spine of internet and different networks/designs of PCs,power generation interconnection,bio-informatics and chemical structures.

关键词： Bridge networks invariants k-banhatti indices maple network graph molecular graph

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Lévy flights and Lévy walks under stochastic resetting

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Physical Review E 2024年第4期109卷 044147-044147页

作者： Bartosz Żbik Bartłomiej Dybiec Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Łojasiewicza 11 30-348 Kraków Poland Institute of Theoretical Physics and Mark Kac Center for Complex Systems Research Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Łojasiewicza 11 30-348 Kraków Poland

Stochastic resetting is a protocol of starting anew, which can be used to facilitate the escape kinetics. We demonstrate that restarting can accelerate the escape kinetics from a finite interval restricted by two absorbing boundaries also in the presence of heavy-tailed, Lévy-type, α-stable noise. However, the width of the domain where resetting is beneficial depends on the value of the stability index α determining the power-law decay of the jump length distribution. For heavier (smaller α) distributions, the domain becomes narrower in comparison to lighter tails. Additionally, we explore connections between Lévy flights (LFs) and Lévy walks (LWs) in the presence of stochastic resetting. First of all, we show that for Lévy walks, the stochastic resetting can also be beneficial in the domain where the coefficient of variation is smaller than 1. Moreover, we demonstrate that in the domain where LWs are characterized by a finite mean jump duration (length), with the increasing width of the interval, the LWs start to share similarities with LFs under stochastic resetting.

关键词： Brownian motion Escape problems Levy flights Noise

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Transport through Amorphous Photonic Materials with Localization and Bandgap Regimes

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Physical Review Letters 2022年第15期129卷 157402-157402页

作者： Frank Scheffold Jakub Haberko Sofia Magkiriadou Luis S. Froufe-Pérez Department of Physics University of Fribourg CH-1700 Fribourg Switzerland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja Mickiewicza 30 Krakow 30-059 Poland

We propose a framework that unifies the description of light transmission through three-dimensional amorphous dielectric materials that exhibit both localization and a photonic bandgap. We argue that direct, coherent reflection near and in the bandgap attenuates the generation of diffuse or localized photons. Using the self-consistent theory of localization and considering the density of states of photons, we can quantitatively describe the total transmission of light for all transport regimes: transparency, light diffusion, localization, and bandgap. Comparison with numerical simulations of light transport through hyperuniform networks supports our theoretical approach.

关键词： Anderson localization Photonic crystals Photonics Scattering theory Disordered systems Diffusion & random walks Finite-difference time-domain method Light scattering

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Non-Destructive Ethanol-Aqueous Solution with Modified Jerusalem Resonator for Disinfectants Against COVID-19 Characterization

Non-Destructive Ethanol-Aqueous Solution with Modified Jerus...

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2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023

作者： Sangpet, Patchadaporn Akkaraekthalin, Prayoot Pechrkool, Tanaporn Chudpooti, Sukanya Chudpooti, Nonchanutt King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Industrial Physics and Medical Instrumentation Bangkok Thailand

ISBN: (纸本)9798350341140

This paper describes a liquid-mixture sensor based on a mushroom-shaped zeroth-order resonator (ZOR). The Jerusalem-shaped mushroom-like structure is designed to reduce the dimensions of a resonator and provide a high Q-factor with an operating frequency of 5.90 GHz. Using perturbation theory, every dielectric property of the liquid-mixture influences the resonance frequency. The structure of the sensor is composed of the modified Jerusalem resonator and 3D-printed case for locking the liquid under test (LUT) to reduce the problematic error from position measurement. Five Ethanol-aqueous concentrations, e.g., 60%, 65%, 70%, 75% and 80%, are chosen to investigate the responsibility of the modified Jerusalem resonator. By detecting the change in resonant frequency of the reflection coefficient, S11, the measured results can classify five conditions of the LUT. Other benefits of the zeroth-order resonator sensor include a nondestructive method, real-time monitoring, and no life-cycle limitation. © 2023 IEEE.

关键词： Ethanol-aqueous solution Jerusalem resonator microwave sensor non-destructive method Zeroth-order resonator

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Enhanced Explanations for Knowledge-Augmented Clustering using Subgroup Discovery 10

Enhanced Explanations for Knowledge-Augmented Clustering usi...

引用

10th IEEE International Conference on Data science and Advanced Analytics, DSAA 2023

作者： Szelazek, MacIej Hudson, Dan Bobek, Szymon Nalepa, Grzegorz J. Atzmueller, Martin Agh University Faculty of Applied Computer Science Kraków Poland Institute of Applied Computer Science Jagiellonian University Jagiellonian Human-Centered Artificial Intelligence Laboratory Mark Kac Center for Complex Systems Research Kraków Poland Osnabrück University Semantic Information Systems Group Osnabrück Germany Osnabrück Germany

ISBN: (纸本)9798350345032

Contemporary machine learning techniques are capable of extracting complex structure from data in a way that complements or exceeds manual examination, yet, as is welldocumented, many of these techniques suffer from a lack of interpretability. This paper extends previous work on explainable and interpretable machine learning, in particular on the 'Knowledge-Augmented Clusters (KnAC)' approach, allowing human users to benefit from uninterpretable 'black box' models to extract structure from datasets by clustering and to make this better understandable. One of the key functions of KnAC is to relate expert-annotated clusters to clusters that have been identified by a machine learning method, and then provide a comprehensible explanation, thus clarifying the relationships that KnAC discovered. Our novel contribution in this paper is to examine the usefulness of subgroup discovery as a way to generate comprehensible explanations within KnAC, and to compare this to the existing approach based on the XAI algorithm Anchors through a detailed evaluation. We find that the approach using subgroup discovery performs equally or better in our extensive experimentation testing this on six different datasets. © 2023 IEEE.

关键词： Machine learning

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Enabling MPI communication within Numba/LLVM JIT-compiled Python code using numba-mpi v1.0

arXiv

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arXiv 2024年

作者： Derlatka, Kacper Manna, Maciej Bulenok, Oleksii Zwicker, David Arabas, Sylwester Faculty of Mathematics and Computer Science Jagiellonian University Kraków Poland Max Planck Institute for Dynamics and Self-Organization Göttingen Germany Faculty of Physics and Applied Computer Science AGH Univeristy of Krakow Poland

The numba-mpi package offers access to the Message Passing Interface (MPI) routines from Python code that uses the Numba just-in-time (JIT) compiler. As a result, high-performance and multi-threaded Python code may utilize MPI communication facilities without leaving the JIT-compiled code blocks, which is not possible with the mpi4py package, a higher-level Python interface to MPI. For debugging purposes, numba-mpi retains full functionality of the code even if the JIT compilation is disabled. The numba-mpi API constitutes a thin wrapper around the C API of MPI and is built around Numpy arrays including handling of non-contiguous views over array slices. Project development is hosted at GitHub leveraging the mpi4py/setup-mpi workflow enabling continuous integration tests on Linux (MPICH, OpenMPI & Intel MPI), macOS (MPICH & OpenMPI) and Windows (MS MPI). The paper covers an overview of the package features, architecture and performance. As of v1.0, the following MPI routines are exposed and covered by unit tests: size/rank, [i]send/[i]recv, wait[all|any], test[all|any], allreduce, bcast, barrier, scatter/[all]gather & wtime. The package is implemented in pure Python and depends on numpy, numba and mpi4py (the latter used at initialization and as a source of utility routines only). The performance advantage of using numba-mpi compared to mpi4py is depicted with a simple example, with entirety of the code included in listings discussed in the text. Application of numba-mpi for handling domain decomposition in numerical solvers for partial differential equations is presented using two external packages that depend on numba-mpi: py-pde and PyMPDATA-MPI. Copyright © 2024, The Authors. All rights reserved.

关键词： Python

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Modeling and Visualization of Complex Systems with the Use of GraphTool 1

引用

20th International Conference on Cooperative Design, Visualization and Engineering, CDVE 2023

作者： Świderska, Iwona Grabska, Ewa Palacz, Wojciech Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland

ISBN: (数字)9783031438158

ISBN: (纸本)9783031438141

This paper proposes a model of a complex design system in the form of a system of graphs with attributed and labeled not only nodes and edges but also entire graphs. The primary task of the graph system is to collect data from information provided by the context and organize this data according to the relationships between them, including adding metadata represented by layers with graph labels that designate the appropriate graphs for layers. At the layer level, we can define relationships between layers as relationships between nodes of graphs belonging to different layers. The proposed model has been implemented in GraphTool which is designed to support modeling and visualization of this graph system type using computer tools for graph transformation. The approach presented in this paper will be illustrated by an example that, concerns human resources management in a large software company and is an example of a description of human cooperation. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Visualization

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Joining Cast Mg AZ91 and Wrought Al 6082 Through Friction Stir Welding 12th

Joining Cast Mg AZ91 and Wrought Al 6082 Through Friction St...

引用

12th Symposium on Friction Stir Welding and Processing, held at the TMS Annual Meeting and Exhibition, TMS 2023

作者： Mroczka, Krzysztof Dymek, Stanislaw Pietras, Adam Węglowska, Aleksandra Hamilton, Carter Kopyściański, Mateusz Department of Materials Engineering Faculty of Materials Science and Physics Cracow University of Technology Krakow Poland Faculty of Metal Engineering and Industrial Computer Science AGH University of Science and Technology Krakow Poland The Lukasiewicz Research Network Institute of Welding Gliwice Poland Department of Mechanical and Manufacturing Engineering Miami University College of Engineering and Computing 56N Garland Hall OxfordOH45056 United States

ISBN: (纸本)9783031226601

Dissimilar welds of cast magnesium AZ91 with wrought aluminium 6082-T6 were fabricated by friction stir welding (6 mm thick) with the alloys alternately placed on the advancing and retreating sides. The unique weld microstructures were characterized through light and electron microscopies (SEM, EDS), tensile tests were performed on samples containing the entire welds and the microhardness was measured across the weld cross-sections. Preliminary results demonstrate that some regions contain a significant amount of the brittle Al12Mg17 phase. To complement the microstructural and mechanical characterization, numerical simulations of the welding process provided deeper insight into the material flow during mixing and to the temperature distributions across the weld zones. Future work will include micro tensile specimens (cross-sectional area of 0.7 × 0.7 mm) to supplement the conventional tensile tests. These micro tensile specimens will be excised from distinct weld areas to highlight differences in local properties that influence weld behavior. © 2023, The Minerals, Metals & Materials Society.

关键词： Welds

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