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arXiv 2025年

作者： Heyman, Alex Zylberberg, Joel Department of Electrical Engineering and Computer Science York University TorontoON Canada Jules Stein Eye Institute University of California Los AngelesCA United States Learning in Machines and Brains Program CIFAR TorontoON Canada

Contemporary large language models are powerful problem-solving tools, but they exhibit weaknesses in their reasoning abilities which ongoing research seeks to mitigate. We investigate graph coloring as a means of evaluating an LLM’s capacities for systematic step-by-step reasoning and possibility space exploration, as well as effects of semantic problem framing. We test Claude 3.5 Sonnet, Llama 3.1 405B, Gemini 1.5 Pro, GPT-4o, o1-mini, and DeepSeek-R1 on a dataset of k-coloring problems with 2 ≤ k ≤ 4 and vertex count 4 ≤ n ≤ 8, using partial algorithmic solvers to further categorize problems by difficulty. In addition to substantial but varying framing effects, we find that all models except o1-mini and R1 exhibit > 60% error rates on difficult problem types in all frames (> 15% for o1-mini and > 10% for R1), and no model achieves perfect accuracy even in the simple domain of 2-coloring 4-vertex graphs. Our results highlight both the considerable recent progress in LLM systematic reasoning and the limits of its reliability, especially in relation to increasing computational costs. We expect that more complex graph coloring problems, and procedural generation of arbitrary-complexity reasoning problems more broadly, offer further untapped potential for LLM benchmarking. © 2025, CC BY.

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Field-controlled dynamics of skyrmions and monopoles

arXiv

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arXiv 2023年

作者： Tai, Jung-Shen B. Hess, Andrew J. Wu, Jin-Sheng Smalyukh, Ivan I. Department of Physics Chemical Physics Program University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program Soft Materials Research Center University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Magnetic monopoles, despite their ongoing experimental search as elementary particles, have inspired the discovery of analogous excitations in condensed matter systems. In chiral condensed matter systems, emergent monopoles are responsible for the onset of transitions between topologically distinct states and phases, like in the case of transitions from helical and conical phase to A-phase comprising periodic arrays of skyrmions. By combining numerical modeling and optical characterizations, we describe how different geometrical configurations of skyrmions terminating at monopoles can be realized in liquid crystals and liquid crystal ferromagnets. We demonstrate how such complex structures can be effectively manipulated by external magnetic and electric fields. Furthermore, we discuss how our findings may hint at similar dynamics in other physical systems, and their potential applications. © 2023, CC BY.

关键词： Liquid crystals

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All-silicon quantum light source by embedding an artificial atom in a nanophotonic cavity

All-silicon quantum light source by embedding an artificial ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Zhiyenbayev, Yertay Redjem, Walid Qarony, Wayesh Ivanov, Vsevolod Papapanos, Christos Liu, Wei Jhuria, Kaushalya Al Balushi, Zakaria Dhuey, Scott Schwartzberg, Adam Tan, Liang Z. Schenkel, Thomas Kante, Boubacar Department of Electrical Engineering and Computer Sciences University of California Berkeley BerkeleyCA94720 United States Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and Engineering University of California Berkeley BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Quantum optics in silicon is promising. We report the first all-silicon quantum light source, with a single atomic center embedded in a nanophotonic cavity, resulting in enhanced light-matter interaction. © 2023 ... 详细信息

ISBN: (纸本)9781957171258

关键词： Silicon

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FePd Single Layer and Synthetic Antiferromagnet with Low Damping and Crystalline Perpendicular Magnetic Anisotropy on Amorphous Si/SiO2 Wafers

FePd Single Layer and Synthetic Antiferromagnet with Low Dam...

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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Deyuan Lyu Jenae E. Shoup Dingbin Huang Xiaojia Wang Daniel B. Gopman Jian-Ping Wang Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota USA Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg Maryland USA Department of Mechanical Engineering University of Minnesota Minneapolis Minnesota USA

(001)-textured L1 0 -phase FePd possesses strong crystalline perpendicular magnetic anisotropy (PMA) and low Gilbert damping constant and thus, is considered a promising material choice for scalable spintronic devices. To date, however, well-textured L1 0 -FePd(001) thin films can only be prepared on a few expensive substrates, which directly impedes their industry compatibility and application prospect. In this digest, we report the deposition of L1 0 -FePd(001) single layer and synthetic antiferromagnet (SAF) on industry-ready Si/SiO 2 wafers with large PMA, low damping, and strong antiferromagnetic interlayer exchange coupling. The microstructures of L1 0 -FePd(001) single layer and SAF were imaged using scanning transmission electron microscopy. We observed sharp and flat interfaces between each layer as well as the heteroepitaxial growth of sample stacks, which explains the high performance of the samples.

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An On-Chip Platform for Multi-Degree-of-Freedom Control of Two-Dimensional Quantum and Nonlinear materials

An On-Chip Platform for Multi-Degree-of-Freedom Control of T...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Haoning Tang Yiting Wang Xueqi Ni Kenji Watanabe Takashi Taniguchi Shanhui Fan Eric Mazur Amir Yacoby Yuan Cao School of Engineering and Applied Sciences Harvard University Cambridge MA USA National Institute for Materials Science Ibaraki Japan Department of Applied Physics and Ginzton Laboratory Stanford University Stanford CA USA Department of Electrical Engineering and Computer Science University of California at Berkeley Berkeley CA USA

We introduce the first on-chip, microelectromechanical system for the in situ tuning of twisted 2D materials, enabling tunable interfacial properties, synthetic topological singularities, and adjustable-polarization l... 详细信息

ISBN: (纸本)9798350369311

关键词： Microelectromechanical systems Quantum materials Lasers and electrooptics System-on-chip Laser tuning Electro-optical waveguides Light sources

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Nonlinear photocurrent in quantum materials for broadband photodetection

arXiv

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arXiv 2024年

作者： Shen, Yulin Primeau, Louis Li, Jiangxu Nguyen, Tuan-Dung Mandrus, David Lin, Yuxuan Cosmi Zhang, Yang Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Department of Materials Sciences and Engineering University of Tennessee KnoxvilleTN37996 United States Materials Science and Technology Division Oak Ridge National Laboratory TN37831 United States Department of Materials Science and Engineering Texas A&M University College StationTX United States Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States

Unlocking the vast potential of optical sensing technology has long been hindered by the challenges of achieving fast, sensitive, and broadband photodetection at ambient temperatures. In this review, we summarize recent progress in the study of nonlinear photocurrent in topological quantum materials, and its application in broadband photodetection without the use of p-n junction based semiconductor diodes. The intrinsic quadratic transverse current-input voltage relation is used to rectify the alternating electric field from incident radio, terahertz or infrared waves into a direct current, without a bias voltage and at zero magnetic field. We review novel photocurrents in several material systems, including topological Weyl semimetals, chiral crystals, ferroelectric materials, and low dimensional topological insulators. These quantum materials hold tremendous promise for broadband high-frequency rectification and photodetection, featuring substantial responsivity and detectivity. Copyright © 2024, The Authors. All rights reserved.

关键词： Electric fields

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Onboard Rooftop Solar Charging for Green Transportation in tourism sector

Onboard Rooftop Solar Charging for Green Transportation in t...

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Renewable Energy and Hydrogen Technologies (GlobConHT), IEEE IAS Global Conference on

作者： Moumita Pramanik Hiranmay Samanta Sudipta Basu Pal Konika Das Bhattacharya Chandan Kumar Chanda Hiranmay Saha Department of Electrical Engineering(EE) Indian Institute of Engineering Science and Technology (IIEST) Shibpur Howrah India Green Energy and Sensor Systems(SAMGESS) School of Advanced Materials Indian Institute of Engineering Science and Technology(IIEST) Shibpur Howrah India Department of Computer Science Technology and Computer Science Information Technology Engineering University of Engineering and Management(UEM) Kolkata Kolkata India

The need for energy conservation and environmental protection have triggered the development and deployment of electric vehicles. Light electric vehicles and fossil fuel based light vehicles are popular means of transport for short distances in not only remote rural areas but also in places of tourist attractions. For Islands in the tropical belt like the Sunderbans in India and other pristine sea beaches in South East Asia where nature is luxuriantly present, green transportation is proposed in this work. The objective is to develop environment friendly transport for these natural havens and islands that have ample renewable resources especially in the form of solar power. In this work, a model of a light electric vehicle is developed that utilizes the solar energy during the daytime for charging its batteries. Battery charge controller inbuilt with boost based MPPT (Maximum Power Point Tracking) of solar irradiation have especially been designed to meet the requirements. The efficiency of the designed MPPT is studied. As accumulation of dust and sand reduces the solar module efficiency, an automated self-cleaning mechanism has also been designed that automatically cleans the solar panel regularly. The life cycle cost and the reduction in carbon emissions coupled with the Cost of Capital Investment and operating expenses of the developed model of green transportation far outweighs the similar values obtained from other modes of remote transportation.

关键词： Maximum power point trackers Renewable energy sources Radiation effects Costs Solar energy Fossil fuels Green transportation

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Anisotropic and Nonlinear Optical Properties of 2D Transition Metal Carbides and Nitrides (MXenes)

Anisotropic and Nonlinear Optical Properties of 2D Transitio...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jeffrey Simon Benjamin Reigle Colton Fruhling Danzhen Zhang Stefano Ippolito Hyunho Kim Vladimir Shalaev Yury Gogotsi Alexandra Boltasseva Elmore Family School of Electrical and Computer Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN USA Department of Materials Science and Engineering A. J. Drexel Nanomaterials Institute Drexel University Philadelphia Pennsylvania USA

We report the experimentally retrieved anisotropic optical permittivity of several MXenes which indicate that these materials exhibit a hyperbolic dispersion relationship. Additionally, we describe the thickness depen... 详细信息

ISBN: (纸本)9798350369311

关键词： Metals Anisotropic Lasers and electrooptics Geometrical optics Optical materials Nonlinear optics Permittivity Laser transitions Electro-optical waveguides Dispersion

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Extrinsic LiDAR-Robot And LiDAR-Camera Calibration For Multi-sensor Fusion*

Extrinsic LiDAR-Robot And LiDAR-Camera Calibration For Multi...

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IEEE Latin American Robotics Symposium, LARS

作者： Gilmar Pereira Da Cruz Hector Azpúrua Fernando Lizarralde Gustavo Medeiros Freitas Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais - Av. Antônio Carlos 6627 Belo Horizonte MG Brazil Department of Computer Science Universidade Federal de Minas Gerais MG Brasil Electrical Engineering Program - COPPE Universidade Federal do Rio de Janeiro RJ Brasil

ISBN: (数字)9798331508807

ISBN: (纸本)9798331508814

In mobile robotics, an essential requirement for the fusion of different sensors is that measurements are expressed with respect to the same reference. In this sense, the transformation between sensors and robot is necessary to ensure better sensor fusion. Therefore, this article proposes an extrinsic sensor calibration based on markers and associated to three orthogonal planes. This technique is applied to two calibration approaches, LiDAR-Robot and LiDAR-Camera. The first one calculates the transformation between a 3D LiDAR sensor and a robot, and the second system calculates the transformation between a 3D LiDAR and an embedded RGB camera. To demonstrate the efficiency of our method, we performed simulations on the CoppeliaSim simulator and experiments in the laboratory. Then, the results show that it is possible to calibrate the sensors with the methodologies.

关键词： Visualization Laser radar Three-dimensional displays Robot vision systems Sensor fusion Cameras Sensor systems Sensors Calibration Registers

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Corrigendum to “Magnetic and electrical properties of Mg 1-x Co x Fe 2 O 4 (x = 0-0.15) ceramics prepared by the solid-state method” [J. Eur. Ceram. Soc.42 (2022) 442–447]

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Journal of the European Ceramic Society 2022年第5期42卷 2565-2566页

作者： Maryam Nili-Ahmadababdi Rasoul Sarraf-Mamoory Amin Yourdkhani Andrei Diaconu Aurelian Rotaru Materials Engineering Department Tarbiat Modares University Tehran Iran Department of Electrical Engineering and Computer Science & Research Center MANSID Stefan cel Mare University Suceava Romania

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