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Evidence of magnetoelectronic electromagnon-mediated transport in flexoelectronic heterostructures

Physical Review B 2023年第16期107卷 165305-165305页

作者： Anand Katailiha Paul C. Lou Ravindra G. Bhardwaj W. P. Beyermann Sandeep Kumar Department of Mechanical Engineering University of California Riverside California 92521 USA Department of Physics and Astronomy University of California Riverside California 92521 USA Materials Science and Engineering Program University of California Riverside California 92521 USA

The superposition of atomic vibrations and flexoelectronic effect gives rise to a cross correlation between free charge carriers and temporal magnetic moment of phonons in conducting heterostructures under an applied strain gradient. The resulting dynamical coupling is expected to give rise to quasiparticle excitations called magnetoelectronic electromagnons that carry electronic charge and temporal magnetic moment. Here, we report experimental evidence of magnetoelectronic electromagnons in the freestanding degenerately doped p-Si based heterostructure thin film samples. These quasiparticle excitations give rise to long-distance (>100 μm) spin transport, demonstrated using spatially modulated transverse magnetothermoelectric and nonlocal resistance measurements. The magnetoelectronic electromagnons are nonreciprocal and give rise to large magnetochiral anisotropy (0.352A−1T−1) that diminishes at lower temperatures. The superposition of nonreciprocal magnetoelectronic electromagnons gives rise to longitudinal and transverse modulations in charge carrier density, spin density, and magnetic moment, demonstrated using the Hall effect and edge dependent magnetoresistance measurements, which can also be called inhomogeneous magnetoelectronic multiferroic effect. These quasiparticle excitations are analogous to photons where time dependent polarization and temporal magnetic moment replace electric and magnetic field, respectively, and most likely topological because they manifest topological Nernst effect. Hence, the magnetoelectronic electromagnon can potentially give rise to quantum interference and entanglement effects in conducting solid state systems at room temperature in addition to efficient spin transport.

关键词： Flexoelectricity Magnetic coupling Magnetotransport Spin current Spin-phonon coupling Doped semiconductors Multiferroics

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Constrained and Unconstrained Nonlinear Control of Rubber Tyred Gantry Crane (RTGC) with DC Motor Using Sliding Mode Controller

Constrained and Unconstrained Nonlinear Control of Rubber Ty...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Cristian MP Napitupulu Steven Bandong Yul Yunazwin Nazaruddin Parsaulian I. Siregar Department of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Engineering Physics Doctoral Program Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Department of Engineering Physics Instrumentation and Control Research Group Institut Teknologi Bandung Bandung Indonesia

The increasing exchange of goods between countries and continents necessitates efficient transportation facilities, with cargo seaports playing a vital role. Within each cargo seaport, the Rubber Tyred Gantry Crane (RTGC) stands out as crucial heavy equipment that requires automation to manage heavy cargo traffic and eliminate bottlenecks. While linear control methods are commonly employed to address this challenge, the inherent nonlinear behavior of the system must be considered. This paper focuses on designing a nonlinear control method, specifically the Sliding Mode Controller (SMC), to create an effective MIMO controller for managing the position, cable length, and sway of the gantry crane system. Two DC motors serve as actuators for controlling the trolley position and cable length, which hoists the container. The nonlinear gantry crane model, integrated with the nonlinear DC motor model, is elaborately derived. Subsequently, the designed non-linear SMC control law and sliding surface are simulated to assess control performance. Acknowledging the limitation of the power source and DC motor specifications, the paper also explores control performance when the voltage to control R TGC is constrained within a specified range. The results demonstrate that the proposed method yields excellent control performance for both constrained and unconstrained control outputs.

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Polarization switching in ferroelectric HfO2 from first-principles lattice mode analysis

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Physical Review B 2025年第13期111卷 134106-134106页

作者： Yubo Qi Sobhit Singh Karin M. Rabe Department of Physics University of Alabama at Birmingham Birmingham Alabama 35294 USA Department of Mechanical Engineering University of Rochester Rochester New York 14627 USA Materials Science Program University of Rochester Rochester New York 14627 USA Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA

In this paper, we introduce a first-principles-based lattice mode analysis method to investigate the competition between different polarization switching paths in HfO2. Because the stability of the polar orthorhombic Pca21 phase of HfO2 arises from a trilinear coupling, polarization switching requires the flipping of not only the polar Γ15Z mode, but also at least one zone-boundary antipolar mode. This means that each polarization state has multiple variants, leading to multiple possible switching paths connecting up- and down-polarized states, which can be systemically enumerated within this framework for efficient identification of the optimal switching path. Our lattice mode analysis also explains why the activation energy of propagation of the most widely studied domain-wall structure in HfO2, which requires the reversal of the X2− mode, is much larger than that of propagation of domain-wall structures with a uniform sign for the X2− mode. This approach deepens our understanding of distinctive properties of ferroelectric HfO2 related to polarization switching and domain-wall motion, including sluggish domain-wall motion, robust ferroelectricity in thin films, and the observation that the antipolar Pbca phase can hardly be transformed to the ferroelectric Pca21 phase by an electric field. Our mode analysis method can be more generally applied to any improper or hybrid improper ferroelectric, in which polarization switching requires changes of nonpolar distortions, for systematic and efficient prediction of optimal switching paths and estimation of coercive fields.

关键词： Ferroelectricity

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Simulation of Cable-Driven Parallel Robot (CDPR) for Application in Creating Batik Patterns

Simulation of Cable-Driven Parallel Robot (CDPR) for Applica...

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International Conference on Instrumentation Control and Automation (ICA)

作者： Indah Radityo Putri Alfisena Juwandana Eko Mursito Budi Estiyanti Ekawati Komarudin Kudiya Instrumentation and Control Graduate Program Institut Teknologi Bandung Bandung Indonesia Departement of Engineering Physics Engineering Physics Research Group Institut Teknologi Bandung Bandung Indonesia Rumah Batik Komar Bandung Indonesia

The usage of the cable-driven parallel robot (CDPR) is proposed to create a batik pattern. In the proposed CDPR system, the artist can intervene in the pattern-making process to maintain pattern uniqueness. Therefore, to provide the system's flexibility and simplicity, CDPR with four cables will be used where all the cables only connect to the top of the end-effector. The design of four cables with four poles will give a simple structure, and the pole can be moved easily according to the cloth's size, usually in the shape of a rectangle. This flexible design allows the artist to intervene via software or manually push the end effector. In this paper, we explored the cable's length calculation, various path simulations to see system accuracy and flexibility, and the analysis of the CDPR workspace. From the CDPR simulation, we can conclude that the longest cable length needed is 1.22 meters, and the shortest is 0 due to the assumption of the pulley as a point. Implementing inverse kinematics in simulation shows that the end-effector can follow various paths, including straight line, square, circle, diagonal, two-circular, spiral, and planetary orbit. We also calculate the percentage of the area if the pulley has a minimal degree to the pole. With the assumption that the minimal degree is 5°, the %Area we got is 75.6%.

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Design and Implementation of Four Cables Suspended Cable-driven Parallel Robot for Pendulum Batik Machine

Design and Implementation of Four Cables Suspended Cable-dri...

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International Conference on Advanced Mechatronics, Intelligent Manufacture, and Industrial Automation (ICAMIMIA)

作者： Alfisena Juwandana Estiyanti Ekawati Eko Mursito Budi Indah Radityo Putri Komarudin Kudiya Instrumentation and Control Graduate Program Institut Teknologi Bandung Bandung Indonesia Departement of Engineering Physics Engineering Physics Research Group Institut Teknologi Bandung Bandung Indonesia Rumah Batik Komar Bandung Indonesia

This study researches the fusion of Indonesian traditional batik art with modernity called the Batik Pendulum. A machine based on Cable-Driven Parallel Robot (CDPR) architecture has been developed to automate the process of Batik Pendulum drawing. The suspended CDPR design uses four cables to provide flexibility and space efficiency. An artist may draw rough pendulum patterns utilizing a tablet as a human interface, which are then coded into coordinate-based code and sent to a microcontroller. The microcontroller drives four stepper motors to synchronize the length of the cables. Therefore, the platform carrying the wax can be moved to create the desired batik patterns. The machine was tested by dripping the paint on the fabric along the test path to validate the accuracy of the patterns. The Mean Absolute Percentage Error test results for the x, y, and radius axes were 1.63%, 1.95%, and 6.33%, while the maximum error values in the movement of the x, y, and radius axes were 8.64, 18.3, and 24.08 mm. This research represents a significant step in preserving Indonesia's cultural heritage while embracing contemporary creativity.

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Inverse Hall-Petch effect in nanocrystalline ice predicted by machine-learned coarse-grained molecular simulations

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Journal of Micromechanics and Molecular physics 2023年第1期8卷 1-10页

作者： Chen, Guang Tao, Lei Kröger, Martin Li, Ying Department of Mechanical Engineering University of Connecticut Storrs 06269 CT United States Department of Materials Polymer Physics Eth Zürich Zürich CH-8093 Switzerland Department of Mechanical Engineering Institute of Materials Science University of Connecticut Storrs 06269 CT United States Polymer Program Institute of Materials Science University of Connecticut Storrs 06269 CT United States

We study the grain-size effect on mechanical behaviors of polycrystalline ice at nanoscale through large-scale molecular dynamics simulations, enabled by an accurate and efficient machine-learned coarse-grained water model [H. Chan, M. J. Cherukara, B. Narayanan, T. D. Loeffler, C. Benmore, S. K. Gray and S. K. Sankaranarayanan. Machine learning coarse grained models for water. Nature Communications 10(1), p. 379, 2019]. Polycrystalline ice systems with different grain sizes in the range of 5∼30 nm are systematically investigated through uniaxial tensile tests. Simulation results reveal that Young's modulus and yield strength increase as the grain size increases, leading to an inverse Hall-Petch effect in nanocrystalline ice. Such an observation is significantly different from the conventional Hall-Petch effect in polycrystalline ice observed by experiments at millimeter scale. The deformation behavior suggests that grain boundaries (GBs), rather than grain interiors, play the active role in accommodating external loading in nanocrystalline ice. Further void analysis of nanocrystalline ice during deformation reveals that nanocrack initiates and propagates along GBs and eventually leads to failure of systems with larger grain sizes (≥20nm), yielding a sudden drop in the stress-strain curve. While for systems with smaller grain sizes (≤15nm), only extensive plastic deformation is presented without significant void growth. Our simulation results demonstrate that the GB sliding is the governing mechanism for the inverse Hall-Petch effect observed in nanocrystalline ice. © 2023 World Scientific Publishing Company.

关键词： grain boundary inverse Hall-Petch effect molecular dynamics simulation Polycrystalline ice water model

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Light-induced tunable optical properties of 1T-TaS2 at different temperatures

Light-induced tunable optical properties of 1T-TaS2 at diffe...

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CLEO: QELS_Fundamental Science, QELS 2022

作者： Li, Weijian Naik, Gururaj V. Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Electrical and Computer Engineering Rice University HoustonTX77005 United States

The c-axis permittivity of 1T-TaS2 - a quasi-2D charge-density-wave material - changes upon illumination due to light-induced reorganization of CDW stacking. Here we probe the mechanism of this reorganization and find... 详细信息

ISBN: (纸本)9781557528209

关键词： Charge density

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Ti02-based Flexible Integrated Photonics for High-sensitivity Temperature Sensing

Ti02-based Flexible Integrated Photonics for High-sensitivit...

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2022 Conference on Lasers and Electro-Optics, CLEO 2022

作者： Zhao, Xuan Fan, Bo Veeraraghavan, Ashok Robinson, Jacob Applied Physics Graduate Program Smattey-Curl Institute Rice University HoustonTX77005 United States Electrical & Computer Engineering Rice University HoustonTX77005 United States

We report a flexible temperature sensor based on Ti02 photonics that shows double the sensitivity compared to silicon photonics. This high sensitivity and biocompatibility pave the way towards point-of-care temperatur... 详细信息

ISBN: (纸本)9781957171050

关键词： Biocompatibility

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ENHANCING THE ELECTROCATALYTIC HYDROGEN EVOLUTION ACTIVITY OF BARE COPPER ELECTRODES THROUGH ULTRAFAST FEMTOSECOND LASER NANOSTRUCTURING 23

ENHANCING THE ELECTROCATALYTIC HYDROGEN EVOLUTION ACTIVITY O...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Ahmad, Shahbaz Egilmez, Mehmet Orhan, Mehmet F. Alnaser, Ali S. Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Physics American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9786250008430

In this study, we report on enhancing the surface area of bare copper electrodes via femtosecond laser processing for its application in alkaline water electrolysis. It is shown that the laser nanostructuring process creates unique and hierarchal nanostructures superimposed over spiky microstructures. Analysing the effect of various laser parameters indicate that scanning speed greatly effects the microstructures by decreasing its dimensions and increasing porosity. The results also shows that laser processing has significantly enhanced the surface area with spiky and superhydrophilic structures. Furthermore, this process is expected to improve the hydrogen evolution reaction (HER) kinetics by allowing more electrode to electrolyte interface, which can favor the enrichment and formation of protons on structured Cu cathode. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Femtosecond lasers

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Boosting Thermoelectric Performance in Nanocrystalline Ternary Skutterudite Thin Films through Metallic CoTe2 Integration

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ACS Applied Materials and Interfaces 2024年第12期16卷 14770-14780页

作者： Jarwal, Bhawna Abbas, Suman Chou, Ta-Lei Vailyaveettil, Suneesh M. Kumar, Ashutosh Quadir, Shaham Ho, Thi-Thong Wong, Deniz P. Chen, Li-Chyong Chen, Kuei-Hsien Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Department of Physics National Central University Taoyuan32001 Taiwan Department of Materials Science and Metallurgical Engineering Indian Institute of Technology Bhilai Chhattisgarh Durg491001 India GoldenCO80401 United States Helmholtz-Zentrum Berlin für Materialien und Energie Hahn-Meitner-Platz 1 BerlinD-14109 Germany Department of Physics National Taiwan University Taipei10617 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan

Metal-semiconductor nanocomposites have emerged as a viable strategy for concurrently tailoring both thermal and electronic transport properties of established thermoelectric materials, ultimately achieving synergistic performance. In this investigation, a series of nanocomposite thin films were synthesized, embedding metallic cobalt telluride (CoTe2) nanophase within the nanocrystalline ternary skutterudite (Co(Ge1.22Sb0.22)Te1.58 or CGST) matrix. Our approach harnessed composition fluctuation-induced phase separation and in situ growth during thermal annealing to seamlessly integrate the metallic phase. The distinctive band structures of both materials have developed an ohmic-type contact characteristic at the interface, which raised carrier density considerably yet negligibly affected the mobility counterpart, leading to a substantial improvement in electrical conductivity. The intricate balance in transport properties is further influenced by the metallic CoTe2 phase’s role in diminishing lattice thermal conductivity. The presence of the metallic phase instigates enhanced phonon scattering at the interface boundaries. Consequently, a 2-fold enhancement in the thermoelectric figure of merit (zT ∼ 1.30) is attained with CGST-7 wt. % CoTe2 nanocomposite film at 655 K compared to that of pristine CGST. © 2024 The Authors. Published by American Chemical Society.

关键词： Nanocomposites

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