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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： Su, Ziyao Smith, Joseph R. Chowdhury, Enam The Ohio State University Department of Materials Science and Engineering ColumbusOH43210 United States Marietta College Department of Physics MariettaOH45750 United States The Ohio State University Department of Electrical and Computer Engineering ColumbusOH43210 United States The Ohio State University Department of Physics ColumbusOH43210 United States

The strong field ionized electron motion and energy in the interaction of few-cycle femtosecond laser and SiO2/HfO2-based multilayer dielectric reflector designed for 800nm is studied using the PIC method incorporated... 详细信息

关键词： Femtosecond lasers

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High-throughput study of the anomalous Hall effect

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npj Computational materials 2023年第1期9卷 767-774页

作者： JakubŽelezný Yuta Yahagi Carles Gomez-Olivella Yang Zhang Yan Sun Institute of Physics Czech Academy of SciencesCukrovarnická1016200 Praha 6Czech Republic Department of Applied Physics Tohoku UniversitySendaiMiyagiJapan Department of Physics and Astronomy University of Tennessee KnoxvilleKnoxvilleTN 37996USA Min H.Kao Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN 37996USA Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Despite its long history,the anomalous Hall continues to attract attention due to its complex origins,its connection to topology,and its use as a probe of magnetic *** this work we investigate the anomalous Hall effect in 2871 ferromagnetic materials using an automatic high-throughput calculation *** analyze general properties of the effect,such as its reliance on spin-orbit coupling strength and *** materials with the largest anomalous Hall effect,we find that symmetry-protected band degeneracies in the non-relativistic electronic structure,such as mirror symmetry-protected nodal lines,are typically responsible for the large ***,we examine the dependence of the anomalous Hall effect on magnetization direction and demonstrate deviations from the commonly assumed expression j^(AHE)~M×E.

关键词： effect symmetry protected

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Physics-informed tracking of qubit fluctuations

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Physical Review Applied 2024年第1期22卷 014033-014033页

作者： Fabrizio Berritta Jan A. Krzywda Jacob Benestad Joost van der Heijden Federico Fedele Saeed Fallahi Geoffrey C. Gardner Michael J. Manfra Evert van Nieuwenburg Jeroen Danon Anasua Chatterjee Ferdinand Kuemmeth Center for Quantum Devices Lorentz Institute and Leiden Institute of Advanced Computer Science Center for Quantum Spintronics Department of Physics QDevil Quantum Machines 2750 Ballerup Denmark Department of Engineering Science Department of Physics and Astronomy Birck Nanotechnology Center Elmore Family School of Electrical and Computer Engineering School of Materials Engineering

Environmental fluctuations degrade the performance of solid-state qubits but can in principle be mitigated by real-time Hamiltonian estimation down to timescales set by the estimation efficiency. We implement a physics-informed and an adaptive Bayesian estimation strategy and apply them in real time to a semiconductor spin qubit. The physics-informed strategy propagates a probability distribution inside the quantum controller according to the Fokker-Planck equation, appropriate for describing the effects of nuclear spin diffusion in gallium arsenide. Evaluating and narrowing the anticipated distribution by a predetermined qubit probe sequence enables improved dynamical tracking of the uncontrolled magnetic field gradient within the singlet-triplet qubit. The adaptive strategy replaces the probe sequence by a small number of qubit probe cycles, with each probe time conditioned on the previous measurement outcomes, thereby further increasing the estimation efficiency. The combined real-time estimation strategy efficiently tracks low-frequency nuclear spin fluctuations in solid-state qubits, and can be applied to other qubit platforms by tailoring the appropriate update equation to capture their distinct noise sources.

关键词： Quantum control Quantum fluctuations & noise Quantum information with solid state qubits Double quantum dots Bayesian methods Fokker–Planck equation Machine learning Radio frequency techniques

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Electron Dynamics of Femtosecond Laser Induced Plasma Inside Multilayer Dielectric High Reflectors Studied Using Particle-in-Cell (PIC) Approach

Electron Dynamics of Femtosecond Laser Induced Plasma Inside...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Femtosecond lasers

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Ising Solver using Weight Profile of Memristor Crossbar Array for Combinatorial Optimization

Ising Solver using Weight Profile of Memristor Crossbar Arra...

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International Electron Devices Meeting (IEDM)

作者： Kyuree Kim Sangwook Youn Jinwoo Park Hyungjin Kim Department of Electrical and Computer Engineering Inha University Incheon Korea Department of Semiconductor Engineering Division of Materials Science and Engineering Hanyang University Seoul Korea

ISBN: (数字)9798350365429

ISBN: (纸本)9798350365436

In this work, a weight profile design is presented for efficient Ising solver system based on a Hopfield neural network (HNN) using $32\times 32$ memristor crossbar array. It utilizes device noise in the probabilistic decision process of simulated annealing for binary current inputs. By implementing 0 and 1 weight matrix across various conductance states in the crossbar, we experimentally solve an unweighted max-cut problem. It is confirmed that higher noise levels, concentrated in high resistance states, enable more efficient convergence to the minimum point of the HNN energy function. This approach effectively exploits intrinsic noise, reducing external hardware overhead and demonstrating feasibility for optimization problems.

关键词： Resistance Noise Memristors Hopfield neural networks Simulated annealing Probabilistic logic Hardware Electron devices Optimization Noise level

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Dual Mode pMUT for Structural Health Monitoring of Piping Systems in Advanced Reactors

Dual Mode pMUT for Structural Health Monitoring of Piping Sy...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Khan, Talha Masood Sabino, John Xu, Chenxi Obregon, Javier Adkins, Joshua Wilis Daly, Matthew Heifetz, Alexander Kultgen, Derek Wiliam Ozevin, Didem University of Illinois Chicago Department of Civil Materials and Environmental Engineering ChicagoIL United States University of Illinois Chicago Department of Electrical and Computer Engineering ChicagoIL United States Argonne National Laboratory Nuclear Science and Engineering Division LemontIL United States

ISBN: (纸本)9798350346459

The objective of this work is to develop a durable MEMS sensor for in situ monitoring of advanced reactor piping. Existing sensors for structural health monitoring (SHM) in nuclear reactor environments have limited temperature ranges and service lifetimes, owing to material constraints. Micromachined transducers using aluminum nitride (AlN) as a sensing element, and silicon carbide (SiC) as a substrate, have the potential to address this challenge. In this work, piezoelectric Micromachined Ultrasonic Transducers (pMUT) capable of delivering passive (acoustic emission) and active (guided wave) ultrasonic sensing for SHM in a high-temperature environment are studied. These sensors will be able to couple directly to the structures for real-time SHM of advanced reactor piping systems. A customized microfabrication process is used to produce dual-mode sensing operation at a small footprint of 5×5 mm2. This process involves sputtering a 1 μm thick AlN sandwiched between metal and handle layer. The frequency modes of the pMUT device are tuned to 140 kHz by varying the lateral dimensions of the sensor. Sensor locations on piping are determined by generating plane waves using finite element simulations and studying the wave dispersion. With higher sensitivity, our pMUT sensors are capable of detecting the smallest defect energy at high temperatures, while decreasing the number of sensors on piping. © 2023 IEEE.

关键词： Real time systems

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Preferences for Using Canva Apps as a Presentation Media Creation Tool Among Gen Z Students: SEM Analysis with TAM and UTAUT2 Approaches 25

Preferences for Using Canva Apps as a Presentation Media Cre...

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25th International Seminar on Intelligent Technology and Its Applications, ISITIA 2024

作者： Maulana, Fairuz Iqbal Lestari, Dian Purnomo, Agung Arifuddin, Rahman Widartha, Vandha Pradwiyasma Adi, Puput Dani Prasetyo Bina Nusantara University School of Computer Science Computer Science Department Jakarta11480 Indonesia Faculty of Medicine Airlangga Surabaya60132 Indonesia Bina Nusantara University Binus Business School Undergraduate Program Entrepreneurship Department Jakarta11480 Indonesia University of Merdeka Malang Department of Electrical Engineering Malang Indonesia Telkom University Information System of Industrial Engineering Faculty Bandung Indonesia Research Center for Telecommunication Bandung Indonesia

ISBN: (纸本)9798350378573

The purpose of this study is to find out what makes Generation Z students accept and use Canva as a tool for making presentation materials. The conceptual framework of this study is the combination of "Technology Acceptance Model (TAM)"and the "Unified Theory of Acceptance and Use of Technology (UTAUT2)". "Structural Equation Modeling (SEM)"used for data analyzation. This research aims to understand the dynamics of Canva acceptance among students. The findings show that enjoyment, fun, and pleasure in using Canva, combined with its creative tools and design-centric approach, significantly resonate with Gen Z's preference for aesthetics. This research highlights that Canva is favored by students for creating engaging presentations. © 2024 IEEE.

关键词： Students

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Stroboscopic x-ray diffraction microscopy of dynamic strain in diamond thin-film bulk acoustic resonators for quantum control of nitrogen-vacancy centers

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Physical Review Applied 2024年第2期22卷 024016-024016页

作者： Anthony D’Addario Johnathan Kuan Noah F. Opondo Ozan Erturk Tao Zhou Sunil A. Bhave Martin V. Holt Gregory D. Fuchs Department of Physics Elmore Family School of Electrical and Computer Engineering Center for Nanoscale Materials School of Applied and Engineering Physics Kavli Institute at Cornell for Nanoscale Science Ithaca New York USA

Bulk-mode acoustic waves in a crystalline material exert lattice strain through the thickness of the sample, which couples to the spin Hamiltonian of defect-based qubits such as the nitrogen-vacancy (N-V) center defect in diamond. This mechanism has previously been harnessed for unconventional quantum spin control, spin decoherence protection, and quantum sensing. Bulk-mode acoustic wave devices are also important in the microelectronics industry as microwave filters. A key challenge in both applications is a lack of appropriate operando microscopy tools for quantifying and visualizing gigahertz-frequency dynamic strain. In this work, we directly image acoustic strain within N-V center-coupled diamond thin-film bulk acoustic wave resonators using stroboscopic scanning hard x-ray diffraction microscopy at the Advanced Photon Source. The far-field scattering patterns of the nanofocused x-ray diffraction encode strain information entirely through the illuminated thickness of the resonator. These patterns have a real-space spatial variation that is consistent with the bulk strain’s expected modal distribution and a momentum-space angular variation from which the strain amplitude can be quantitatively deduced. We also perform optical measurements of strain-driven Rabi precession of of the N-V center spin ensemble, providing an additional quantitative measurement of the strain amplitude. As a result, we directly measure one of the six N-V spin-stress coupling parameters, b=2.73(2) MHz/GPa, by correlating these measurements at the same spatial position and applied microwave power. Our results demonstrate a unique technique for directly imaging ac lattice strain in micromechanical structures and provide a direct measurement of a fundamental constant for the N-V center defect spin Hamiltonian.

关键词： Quantum control Spin dynamics Strain Stress Micromechanical devices Nitrogen vacancy centers in diamond Acoustic techniques X-ray diffraction

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Limits to the Energy-Conversion Efficiency of Air-Bridge Thermophotovoltaics

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Physical Review Applied 2023年第3期19卷 034099-034099页

作者： Jihun Lim Stephen R. Forrest Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109 USA Department of Physics and Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA

Air-bridge thermophotovoltaic (ABTPV) devices demonstrate near-99% utilization of photons whose energy is less than the semiconductor band gap (known as out-of-band, OOB, photons). Here, we determine 55.5% is the thermodynamic limit at an emitter temperature of 1400 K for single junction ABTPVs based on detailed balance, which compares to a thus-far reported efficiency of 32%. A technology computer-aided design model for the (In,Ga)As diode predicts that suppressing the surface-recombination velocity to <200 cm/s significantly improves the open-circuit voltage and the shunt resistance, resulting in 48.6% as the practical efficiency limit. We find that a 1% OOB loss due to free-carrier absorption in doped regions of the TPV can drastically decrease the efficiency at larger band gaps and lower emitter temperature. We also analyze the effects of shadowing by metal grids, which generally introduces only minor losses in TPV performance.

关键词： Carrier generation & recombination electrical properties Energy conversion technologies Optoelectronics Thermal energy harvesting devices Thermodynamics Semiconductors Thermal photovoltaics

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Self-healable stretchable printed electronic cryogels for in-vivo plant monitoring

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npj Flexible Electronics 2023年第1期7卷 59-69页

作者： Eloïse Bihar Elliot J.Strand Catherine A.Crichton Megan N.Renny Ignacy Bonter Tai Tran Madhur Atreya Adrian Gestos Jim Haseloff Robert R.McLeod Gregory L.Whiting Paul M.Rady Department of Mechanical Engineering University of Colorado Boulder1111 Engineering DriveBoulderCO 80309USA Materials Science and Engineering University of Colorado Boulder4001 Discovery DriveBoulderCO 80303USA Department of Plant Sciences University of CambridgeDowning StreetCambridge CB23EAUK Materials Instrumentation and Multimodal Imaging Core Facility University of Colorado Boulder1111 Engineering Drive BoulderBoulderCO 80309USA Department of Electrical Computerand Energy EngineeringUniversity of Colorado Boulder1111 Engineering DriveBoulderCO 80309USA

A key challenge in bioelectronics is to establish and improve the interface between electronic devices and living tissues,enabling a direct assessment of biological *** integrated with plant tissue can provide valuable information about the plant itself as well as the surrounding environment,including air and soil *** obstacle in developing interfaces to plant tissue is mitigating the formation of fibrotic tissues,which can hinder continuous and accurate sensor operation over extended *** systems that utilize suitable biocompatible materials alongside appropriate fabrication techniques to establish plantelectronic interfaces could provide for enhanced environmental understanding and ecosystem management *** meet these demands,this study introduces an approach for integrating printed electronic materials with biocompatible cryogels,resulting in stable implantable hydrogel-based bioelectronic devices capable of long-term operation within plant *** inkjet-printed cryogels can be customized to provide various electronic functionalities,including electrodes and organic electrochemical transistors(OECTs),that exhibit high electrical conductivity for embedded conducting polymer traces(up to 350 S/cm),transconductance for OECTs in the mS range,a capacitance of up to 4.2mF g−1 in suitable structures,high stretchability(up to 330%strain),and selfhealing *** biocompatible functionalized cryogel-based electrodes and transistors were successfully implanted in plant tissue,and ionic activity in tomato plant stems was collected for over two months with minimal scar tissue formation,making these cryogel-based printed electronic devices excellent candidates for continuous,in-situ monitoring of plant and environmental status and health.

关键词： electronic utilize integrating

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