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Quantum capacitive coupling between large-angle twisted graphene layers

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arXiv 2021年

作者： Mreńca-Kolasińska, Alina Rickhaus, Peter Zheng, Giulia Richter, Klaus Ihn, Thomas Ensslin, Klaus Liu, Ming-Hao Department of Physics National Cheng Kung University Tainan70101 Taiwan AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland Solid State Physics Laboratory ETH Zürich ZürichCH-8093 Switzerland Institut für Theoretische Physik Universität Regensburg RegensburgD-93040 Germany

Large-angle twisted bilayer graphene (tBLG) is known to be electronically decoupled due to the spatial separation of the Dirac cones corresponding to individual graphene layers in the reciprocal space. The close spacing between the layers causes strong capacitive coupling, opening possibilities for applications in atomically thin devices. Here, we present a self-consistent quantum capacitance model for the electrostatics of decoupled graphene layers, and further generalize it to deal with decoupled tBLG at finite magnetic field and large-angle twisted double bilayer graphene at zero magnetic field. We probe the capacitive coupling through the conductance, showing good agreement between simulations and experiments for all the systems considered. We also propose a new experiment utilizing the decoupling effect to induce a huge and tunable bandgap in bilayer graphene by applying a moderately low bias. Our model can be extended to systems composed of decoupled graphene multilayers as well as non-graphene systems, opening a new realm of quantum-capacitively coupled materials. Copyright © 2021, The Authors. All rights reserved.

关键词： Graphene

The impact of hydrostatic pressure, nonstoichiometry, and doping on trimeron lattice excitations in magnetite during axis switching

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arXiv 2023年

作者： Kolodziej, T. Piętosa, J. Puźniak, R. Wiśniewski, A. Król, G. Kąkol, Z. Bialo, I. Tarnawski, Z. Ślęzak, M. Podgórska, K. Niewolski, J. Gala, M.A. Kozlowski, A. Honig, J.M. Tabiś, W. AGH University of Krakow Faculty of Physics and Applied Computer Science Aleja Mickiewicza 30 Kraków30-059 Poland SOLARIS National Synchrotron Radiation Centre Czerwone Maki 98 Kraków30-392 Poland Institute of Physics Polish Academy of Sciences Aleja Lotników 32/46 Warszawa02-668 Poland AGH University of Krakow IT Solutions Centre Aleja Mickiewicza 30 Kraków30-059 Poland Physik-Institut Universität Zürich Winterthurerstrasse 190 ZurichCH-8057 Switzerland Institute of Solid State Physics TU Wien Vienna1040 Austria Department of Chemistry Purdue University West LafayetteIN United States

Trimeron lattice excitations in single crystalline magnetite, in the form of the c axis switching (i.e. the reorganization of the lattice caused by external magnetic field) at temperatures below the Verwey temperature TV are observed by magnetization experiments. These excitations exhibit strong sensitivity to doping (with Zn, Al, and Ti), nonstoichiometry and hydrostatic pressure (p © 2023, CC BY.

关键词： Magnetite

Electrospun Polylactid/Polyhydroxyoctanoate (Pla/Pho) Biomaterials Support Exceptional Fibroblasts Adhesion and Migration

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SSRN

SSRN 2022年

作者： Malagurski, Ivana Levic, Steva Pavlovic, Vladimir Nesic, Aleksandra Witko, Tomasz Solarz, Daria Guzik, Maciej Nikodinovic-Runic, Jasmina Institute of Molecular Genetics and Genetic Engineering University of Belgrade Belgrade11042 Serbia Faculty of Agriculture University of Belgrade Belgrade11081 Serbia Faculty of Technology Novi Sad21000 Serbia Department of Product Technology and Ecology Krakow University of Economics Rakowicka 27 Kraków31-510 Poland Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences Niezapominajek 8 Krakow30-239 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Krakow30-348 Poland

Polyhydroxyoctanoate, as a biocompatible and biodegradable biopolymer, represents an ideal candidate for biomedical application. However, physical properties make it unsuitable for electrospinning, currently the most widely used technique for fabrication of fibrous scaffolds. To overcome this, it was blended with polylactic acid and polymer blend fibrous biomaterials were produced by electrospinning. The obtained PLA/PHO fibers were cylindrical, smaller in size and more hydrophilic in comparison to the pure PLA sample. Cytotoxicity evaluation combined with confocal microscopy used to visualize cells migration and distribution showed that PLA/PHO samples support exceptional cell adhesion and viability, indicating excellent biocompatibility. © 2022, The Authors. All rights reserved.

关键词： Biocompatibility

Parametrization of CPW for photonics application with the use of closed form formulas

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Periodica polytechnica Electrical engineering and computer s...

Periodica polytechnica Electrical engineering and computer science 2020年第3期64卷 286-290页

作者： Kula, Sebastian Institute of Mechanics and Applied Computer Science Faculty of Mathematics. Physics and Technical Sciences Kazimierz Wielki University Jana Karola Chodkiewicza 30 Bydgoszcz85-064 Poland

In this paper parametrized analysis of CPW (Coplanar Waveguide) applied in photonics is presented. The analysis is based on analytical formulas, which were delivered and modified from conformal mapping technique, and also after review of available literature from analytical models for the conventional CPW. Adjustment of the already reported CPW formulas was performed to properly model thin films CPW structures in PIC (Photonic Integrated Circuit). Thus, a closed expressions were proposed to simulate basic parameters, like: Per unit length (p.u.l.) R (resistance), L (inductance), C (capacitance), G (conductance) and propagation quantity like characteristic impedance Zo versus frequency. The CPW line dedicated for the PIC application, is based on InP (Indium Phosphide) substrate and with air or BCB (Benzocyclobutene) surroundings of the metallization on the top. The modified formulas are curve-fitting approximations, with new fitting coefficients. Essential modifications are for p.u.l. C and p.u.l. L. Usefulness and effectiveness of the modified method was verified through results comparison with simulations in full-wave Electronic Design Automation software, with the circuit simulator QUCS and with real measurements, conducted with the use of PNA (Performance Network Analyzer). The paper novelty are new coefficients for analytical formulas, implementation of modified formulas in the octave code and model parametrization for geometrical parameters. © 2020 Budapest University of Technology and Economics. All rights reserved.

关键词： Coplanar waveguides

Study of spin-orbit interactions and interlayer ferromagnetic coupling in Co/Pt/Co trilayers in wide range of heavy metal thickness

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arXiv 2021年

作者： Ogrodnik, Piotr Grochot, Krzysztof Karwacki, Lukasz Kanak, Jaroslaw Prokop, Michal Chęciński, Jakub Skowroński, Witold Ziętek, Slawomir Stobiecki, Tomasz AGH University of Science and Technology Institute of Electronics Kraków30-059 Poland Institute for Theoretical Physics Utrecht University Princetonplein 5 Utrecht3584 CC Netherlands CSIC BIST Campus UAB Bellaterra Barcelona08193 Spain Warsaw University of Technology Faculty of Physics Warsaw00-662 Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków30-059 Poland Institute of Molecular Physics Polish Academy of Sciences ul. M.Smoluchowskiego 17 Poznań60-179 Poland

The spin-orbit torque, a torque induced by a charge current flowing through the heavy-metal conducting layer with strong spin-orbit interactions, provides an efficient way to control the magnetization direction in heavy-metal/ferromagnet nanostructures, required for applications in the emergent magnetic technologies like random access memories, high-frequency nano oscillators, or bio-inspired neuromorphic computations. We study the interface properties, magnetization dynamics, magnetostatic features and spin-orbit interactions within the multilayer system Ti(2)/Co(1)/Pt(0-4)/Co(1)/MgO(2)/Ti(2) (thicknesses in nanometers) patterned by optical lithography on micrometer-sized bars. In the investigated devices, Pt is used as a source of the spin current and as a non-magnetic spacer with variable thickness, which enables the magnitude of the interlayer ferromagnetic exchange coupling to be effectively tuned. We also find the Pt thickness-dependent changes in magnetic anisotropies, magnetoresistance, effective Hall angle and, eventually, spin-orbit torque fields at interfaces. The experimental findings are supported by the relevant interface structure-related simulations, micromagnetic, macrospin, as well as the spin drift-diffusion models. Finally, the contribution of the spin-orbital Edelstein-Rashba interfacial fields is also briefly discussed in the analysis. © 2021, CC BY.

关键词： Heavy metals

Studying π+π− photoproduction beyond Pomeron exchange

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arXiv 2024年

作者： Bibrzycki, Lukasz Hammoud, Nadine Mathieu, Vincent Perry, Robert J. Akridge, Alex Fernández-Ramírez, César Montaña, Gloria Pilloni, Alessandro Rodas, Arkaitz Shastry, Vanamali Smith, Wyatt A. Winney, Daniel Szczepaniak, Adam P. AGH University of Krakow Faculty of Physics and Applied Computer Science KrakówPL-30-059 Poland Institute of Nuclear Physics Polish Academy of Sciences KrakówPL-31-342 Poland Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona BarcelonaE-08028 Spain Center for Exploration of Energy and Matter Indiana University BloomingtonIN47403 United States Department of Physics Indiana University BloomingtonIN47405 United States MadridE-28040 Spain Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States Dipartimento di Scienze Matematiche e Informatiche Scienze Fisiche e Scienze della Terra Università degli Studi di Messina MessinaI-98166 Italy INFN Sezione di Catania CataniaI-95123 Italy Department of Physics Old Dominion University NorfolkVA23529 United States Department of Physics The George Washington University WashingtonDC20052 United States Department of Physics University of California BerkeleyCA94720 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany

Forward photoproduction of π+π− pairs with invariant mass of the order of mρ ∼ 770 MeV is traditionally understood to be produced via Pomeron exchange. Based on a detailed analysis of the CLAS photoproduction data, it is shown that the dynamics of two-pion photoproduction for |t| 0.5 GeV2 cannot be explained by Pomeron exchange alone. This motivates the development of a new theoretical model of two-pion photoproduction which incorporates both two-pion and pion-nucleon resonant contributions. After fitting free parameters, the model provides an excellent description of the low moments of the angular distribution measured at CLAS, and enables an assessment of the relative contributions of particular production mechanisms and an interpretation of the various features of the data in terms of these mechanisms. Copyright © 2024, The Authors. All rights reserved.

关键词： Angular distribution

On the study of multiple wave profiles and hybrid phenomena to the newly developed multi-component Gross-Pitaevskii system and stability analysis

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Ain Shams Engineering Journal 2025年第9期16卷

作者： Bilal, Muhammad Rehman, Shafqat Ur Alawaideh, Yazen M. Popa, Ioan-Lucian Al-khamiseh, Bashar M. Department of Physics Shanghai University Shanghai 200444 China Department of Mathematics Grand Asian University Sialkot 51310 Pakistan Applied Science Research Center Applied Science Private University Amman Jordan Department of Computing Mathematics and Electronics 1 Decembrie 1918 University of Alba Iulia Alba Iulia 510009 Romania Faculty of Mathematics and Computer Science Transilvania University of Brasov Iuliu Maniu Street 50 Brasov 500091 Romania

This research investigates a dynamical analysis of the newly developed Gross-Pitaevskii equations, focusing on finding exact soliton solutions. By uncovering these solutions, this research aims to understand the complicated dynamics underlying superfluidity, superconductivity, and associated nonlinear phenomena, thereby providing valuable insights into the behavior of these systems. The considered model is analytically examined using advanced integration tools, such as the new extended hyperbolic function and Kumar-Malik methods. Diverse wave solutions are extracted in hyperbolic, periodic, Jacobi elliptic, exponential functions, and complex multiple soliton structures. We meticulously simulate and verify all reported solutions using the Wolfram Mathematica package. The achieved outcomes have significant implications for several scientific disciplines, spanning optical fiber, plasma physics, mathematical physics, condensed matter physics, and fluid dynamics. Additionally, we display different wave profiles with the appropriate parametric values and plot the gain spectrum for the modulation instability analysis. This visualization strategy increases our comprehension of the derived solutions and expedites an in-depth exploration of their potential real-world applications. The aforementioned techniques provide a robust foundation for examining the nonlinear phenomena encountered in numerous physical domains. The key novelty of this study lies in its pioneering application of two effective analytical methods to a previously unexplored model, thereby filling a significant knowledge gap in the field. © 2025 The Author(s)

关键词： Condensed matter physics Efficient analytical techniques Exact solutions Modulation instability analysis Newly developed Gross-Pitaevskii system

XYZ spectroscopy at electron-hadron facilities III: Semi-inclusive processes with vector exchange

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arXiv 2024年

作者： Winney, D. Pilloni, A. Perry, R.J. Bibrzycki, L. Fernández-Ramírez, C. Hammoud, N. Mathieu, V. Montaña, G. Rodas, A. Shastry, V. Smith, W.A. Szczepaniak, A.P. and Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Dipartimento di Scienze Matematiche e Informatiche Scienze Fisiche e Scienze della Terra Università degli Studi di Messina MessinaI-98166 Italy INFN Sezione di Catania CataniaI-95123 Italy Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona E-08028 Spain AGH University of Krakow Faculty of Physics and Applied Computer Science KrakówPL-30-059 Poland MadridE-28040 Spain Institute of Nuclear Physics Polish Academy of Sciences Kraków31-342 Poland Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States Department of Physics Old Dominion University NorfolkVA23529 United States Center for Exploration of Energy and Matter Indiana University BloomingtonIN47403 United States Department of Physics Indiana University BloomingtonIN47405 United States Department of Physics The George Washington University WashingtonDC20052 United States Department of Physics University of California BerkeleyCA94720 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Inclusive production processes will be important for the first observations of XYZ states at new generation electron-hadron colliders, as they generally benefit from larger cross sections than their exclusive counterparts. We make predictions of semi-inclusive photoproduction of the χc1(1P) and X(3872), whose peripheral production is assumed to be dominated by vector exchanges. We validate the applicability of Vector Meson Dominance in the axial-vector charmonium sector and calculate production rates at center-of-mass energies relevant for future experimental facilities. We find the semi-inclusive cross sections near threshold to be enhanced by a factor of ∼ 2–3 compared to the exclusive reaction and well suited for a first observation in photoproduction. Copyright © 2024, The Authors. All rights reserved.

关键词： Vectors

Superconducting dome in LaAlO3/SrTiO3 interfaces as a direct consequence of the extended s-wave symmetry of the gap

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Physical Review B 2020年第8期102卷 085420-085420页

作者： M. Zegrodnik P. Wójcik Academic Centre for Materials and Nanotechnology AGH University of Science and Technology Al. Mickiewicza 30 30-059 Krakow Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 30-059 Krakow Poland

The two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 interface exhibits gate-tunable superconductivity with a domelike shape of TC as a function of electron concentration. Here, we propose that the experimentally observed behavior can be explained as a direct effect of the dominant extended s−wave symmetry of the superconducting gap. Our results agree very well with the experimental data. As shown, neither the correlation effects nor the spin-orbit coupling significantly influence the physical picture of the paired state stemming from our analysis.

关键词： Multiband superconductivity Superconducting gap Superconducting order parameter Superconductivity Solid-solid interfaces Two-dimensional electron system Unconventional superconductors Bogoliubov-de Gennes equations Lattice models in condensed matter Many-body techniques