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作者： Xing, M.-J. Jalil, M.B.A. Tan, S.G. Jiang, Y. State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing 100083 China Information Storage Materials Laboratory Electronic and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Computational Nanoelectronics and Nano-Device Laboratory Electronic and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Data Storage Institute National University of Singapore Singapore 117608 Singapore

We present a theoretical study of spin transport through an asymmetry ring in which the Rashba spin-orbit interaction (RSOI) is the dominant spin-splitting mechanism. The left part and the right part of the asymmetry ring have different RSOI coefficients α1 and α2. Using Griffith's boundary conditions, we investigate the influence of RSOI coefficients on the conductance and spin polarization. For typical range of RSOI coefficients, the transmitted conductance is much more strongly dependent on α2 than α1. While the transmitted spin polarization is strongly influenced by the RSOI strengths of both arms, i.e., α1 and α2, this dependence is distinct from that observed in a symmetric ring. By considering both the conductance and spin polarization, we can optimize the RSOI parameters in the ring for different sensor applications. For instance, one can change the spin polarization almost from the full range of 0 to 1, whilst keeping the conductance constant (since α1 has little effect on conductance). On the other hand, by varying α2, one can tune the RSOI strengths such that a large change in both conductance and spin polarization can be achieved. © 2006 IEEE.

关键词： Spin polarization

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Coupling asymmetry effect on the coherent spin current through a ferromagnetic lead/quantum dot/ferromagnetic lead system

Coupling asymmetry effect on the coherent spin current throu...

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作者： Ma, Minjie Jalil, Mansoor B. A. Tan, Seng Ghee Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Data Storage Institute Agency of Science Technology and Research (A and STAR) 117608 Singapore Singapore Computational Nanoelectronics and Nano-Device Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore

The spin dependent transport through asymmetric double barrier magnetic tunnel junction system is theoretically studied, based on the non-equilibrium Green's function obtained via the equation of motion method. In the system, a single energy level is considered in the semiconductor quantum dot, which is asymmetrically coupled to the left and the right leads. It is found that due to the asymmetric coupling, the threshold voltages for charge current I-V characteristics are different for positive and negative applied bias, so are the spin current I-V characteristics. Besides, it is also found that the direction of current flow also modifies the electron occupancy within the dot. © 2006 IEEE.

关键词： Semiconductor quantum dots

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Generalized spin electro-motive force in spatially dependent systems

Generalized spin electro-motive force in spatially dependent...

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作者： Jalil, M.B.A. Tan, S.G. Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Computational Nanoelectronics and Nano-Device Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Data Storage Institute A STAR (Agency for Science Technology and Research) 117608 Singapore Singapore

The coupling of an electron to an electromagnetic field is usually described by U(1) gauge fields in the Hamiltonian, whose gradient and curvature yield the electric and magnetic fields, respectively. We apply this gauge field formalism for two cases: i) electrons traveling through a medium with a spatial moment texture, and adiabatically relaxing along the local moment orientation, and ii) in the presence of Rashba spin-orbit interaction. Having obtained the Abelian U(1) and non-Abelian SU(2) gauge fields corresponding to the two cases, we apply the generalized Maxwell's relation to derive the resulting spin electromotive force (e.m.f.). Finally, we analyze the spin e.m.f. effect in an exemplary domain-wall system in a ferromagnetic nanostrip. © 2006 IEEE.

关键词： Hamiltonians

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Computer Vision, Pattern Recognition, Image Processing, and Graphics 1

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丛书名： Communications in Computer and Information science

1000年

作者： R. Venkatesh Babu Mahadeva Prasanna Vinay P. Namboodiri

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Hybrid Artificial Intelligent Systems 1

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丛书名： Lecture Notes in Computer science

1000年

作者： Pablo García Bringas Hilde Pérez García Francisco Javier Martínez de Pisón José Ramón Villar Flecha Alicia Troncoso Lora Enrique A. de la Cal Álvaro Herrero Francisco Martínez Álvarez Giuseppe Psaila Héctor Quintián Emilio Corchado

ISBN: (数字)9783031154713

ISBN: (纸本)9783031154706

This book constitutes the refereed proceedings of the 17th International Conference on Hybrid Artificial Intelligent Systems, HAIS 2022, held in Salamanca, Spain, in September 2022.;The 43 full papers presented in this book were carefully reviewed and selected from 67 submissions. They were organized in topical sections as follows: bioinformatics; data mining and decision support systems; deep learning; evolutionary computation; HAIS applications; image and speech signal processing; and optimization techniques.

关键词： Artificial Intelligence Computer Applications data Mining and Knowledge Discovery

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International Joint Conference 16th International Conference on computational Intelligence in Security for Information Systems (CISIS 2023) 14th International Conference on EUropean Transnational Education (ICEUTE 2023) 1

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丛书名： Lecture Notes in Networks and Systems

1000年

作者： Pablo García Bringas Hilde Pérez García Francisco Javier Martínez de Pisón Francisco Martínez Álvarez Alicia Troncoso Lora Álvaro Herrero José Luis Calvo Rolle Héctor Quintián Emilio Corchado

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Advances in Artificial Intelligence 1

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丛书名： Lecture Notes in Computer science

1000年

作者： Francisco Herrera Sergio Damas Rosana Montes Sergio Alonso Óscar Cordón Antonio González Alicia Troncoso

ISBN: (数字)9783030003746

ISBN: (纸本)9783030003739

This book constitutes the refereed proceedings of the 18th Conference of the Spanish Association for;Artificial Intelligence, CAEPIA 2018, held in Granada, Spain, in October 2018.;The 36 full papers presented were carefully selected from 240 submissions. The Conference of the Spanish Association of;Artificial Intelligence (CAEPIA) is a biennial forum open to researchers from all over the world to present and discuss their latest scientific and technological advances in Antificial Intelligence (AI). Authors are kindly requested to submit unpublished original papers describing relevant research on AI issues from all points of view: formal, methodological, technical or applied.

关键词： Artificial Intelligence Algorithm Analysis and Problem Complexity Discrete Mathematics in Computer science data Structures Image Processing and Computer Vision Models and Principles

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Digital Twin for Digital Health: Body Joint Modeling and 3D Pose Reconstruction

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ACM Transactions on Computing for Healthcare 1000年

作者： Huan Chen Xiaoye Qian Yi Cai Tianyu Lu Xiaowei Xu Feng Lin Shih-Ching Yeh Ming-Chun Huang Department of Electrical Computer and Systems Engineering Case Western Reserve University USA Department of Computer Science Northeastern University USA Department of Cardiovascular Surgery Guangdong Cardiovascular Institute Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences) and Southern Medical University China School of Cyber Science and Technology ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University China Department of Photonic System National Yang Ming Chiao Tung University and Department of Computer Science and Information Engineering National Central University Taiwan Department of Data and Computational Science Duke Kunshan University China

Body joint modeling and human pose reconstruction provide precise motion and quantitative geometric information about human dynamics. The rich motion information obtained from human pose estimation plays important roles in a wide range of digital twin and connected health applications. However, current related researches have difficulties in extracting the joints’ spatial-temporal correlations from different levels. This is due to the poses being at various complexities in moving various joints differently. Hence, the typical conventional transformer method is non-adaptable and barely meets the aforementioned requirement. In this paper, we propose the Body Joint Interactive transFormers (BJIFormer) to extract the multi-level joints’ spatial-temporal information. The design enables the model to learn the inner joints’ correlation inside the body parts across frames and propagate the extracted information across the body parts with shared joints. The multi-level body joint interactive scheme has greater efficiency improvement by restricting the self-attention computation to partial body parts and connecting each body part by torso. The proposed interactive approach explores the spatial-temporal correlation following the hierarchical paradigm and effectively estimates and reconstructs 3D human poses.

关键词： Digital Twin Digital Health Body Joint Modeling Pose Reconstruction

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A self-consistent SDD-NEGF approach for modelling magnetic tunnel junctions

A self-consistent SDD-NEGF approach for modelling magnetic t...

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作者： Siu, Z.B. Jalil, M.B.A. Tan, S.G. Wang, J.-S. Department of Physics Center for Computational Science and Engineering National University of Singapore 117542 Singapore Singapore Data Storage Institute Agency for Science Technology and Research (A STAR) 117608 Singapore Singapore Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Computational Nanoelectronics and Nano-device Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Institute of High Performance Computing Agency for Science Technology and Research (A STAR) 138632 Singapore Singapore

Most contemporary work on magnetic tunnel junctions either consider ballistic quantum transport across the tunneling barrer, for instance via the Non Equilibrium Green's Function (NEGF) formalism, or treat the tunneling region as a lump resistance connected to bulk metallic leads in the Spin Drift-Diffusion (SDD) approach. The effects of interfacial barriers and central device physics on the spin accumlation in the leads have largely been ignored in most NEGF calculations. In this work we introduce a self consistent approach that combines the NEGF and SDD methods. We calculate the effects of the barrier potential height and spin orbit interaction on the spin injection from a ferromagnet to a semiconductor through the barrier. © 2006 IEEE.

关键词： Tunnel junctions

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Achieving highly localized effective magnetic fields with non-uniform rashba spin-orbit coupling for tunable spin current in metal/semiconductor/metal structures

Achieving highly localized effective magnetic fields with no...

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作者： Fujita, Takashi Jalil, Mansoor B. A. Tan, Seng Ghee Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Data Storage Institute A STAR (Agency for Science Technology and Research) Singapore 117608 Singapore Computational Nanoelectronics and Nano-Device Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore

We theoretically study the spin-dependent transport of conduction electrons across typical metal/semiconductor (SC)/metal structures, where the SC channel exhibits Rashba spin-orbit coupling (SOC) and the metal contacts do not. The spatial discontinuity of the Rashba SOC is shown to result in highly localized, effective magnetic field barriers at the device interfaces. As a result, electrons with oppositely polarized spins along the injection direction are found to be transmitted with different probabilities, resulting in a finite spin polarization. The value of the spin polarization depends sensitively on the Rashba SOC strength within the SC channel, which is well known to be adjustable by an applied gate bias. Thus the proposed structure could be useful as a tunable source of spin-polarized current in spintronic applications. © 2006 IEEE.

关键词： Spin orbit coupling

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