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Design Automation Conference

作者： Qinghai Liu Qinfei Tang Jiarui Chen Chuandong Chen Ziran Zhu Huan He Jianli Chen Yao-Wen Chang Center for Discrete Mathematics Fuzhou University Fuzhou China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou China College of Computer and Date Science Fuzhou University Fuzhou China Department of Microelectronics Fuzhou University Fuzhou China Department of Microelectronics Southeast University Nanjing China Hangzhou Huawei Enterprises Telecommunication Technologies Co. Ltd Hangzhou China State Key Lab of ASIC & System Fudan University Shanghai China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

PCB routing becomes time-consuming as the complexity of PCB design increases. Unlike traditional schemes that treat the two essential PCB routing processes separately, namely, escape and bus routing, we consider the continuity between them and present a golden-pin-based routing scheme to find the desired solution with angle and topology constraints. Further, conventional rip-up and reroute methods are often ineffective and inefficient for congestion alleviation and routability optimization. We construct a component graph by modeling components as vertices and applying the minimum weight vertex covering method to improve the routability. A self-adaptable ordering method is presented for escape routing to arrange the pin order on the component boundary, guaranteeing successful bus routing. In addition, escape routing is performed based on a disjoint path method. We construct a dynamic Hanan grid in bus routing and utilize a novel congestion adjustment technique to improve solution quality. Compared with FreeRouting and Allegro, the experiment results show that our algorithm achieves high routability and a significant 90% runtime reduction.

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Superconductivity in pressurized trilayer La4Ni3O10-δ single crystals

arXiv

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arXiv 2023年

作者： Zhu, Yinghao Peng, Di Zhang, Enkang Pan, Bingying Chen, Xu Chen, Lixing Ren, Huifen Liu, Feiyang Hao, Yiqing Li, Nana Xing, Zhenfang Lan, Fujun Han, Jiyuan Wang, Junjie Jia, Donghan Wo, Hongliang Gu, Yiqing Gu, Yimeng Ji, Li Wang, Wenbin Gou, Huiyang Shen, Yao Ying, Tianping Chen, Xiaolong Yang, Wenge Cao, Huibo Zheng, Changlin Zeng, Qiaoshi Guo, Jiangang Zhao, Jun State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Shanghai201203 China College of Physics and Optoelectronic Engineering Ocean University of China Shandong Qingdao266100 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Center for High Pressure Science and Technology Advanced Research Shanghai201203 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China Institute of Nanoelectronics and Quantum Computing Fudan University Shanghai200433 China Shanghai Branch Hefei National Laboratory Shanghai201315 China

The pursuit of discovering new high-temperature superconductors that diverge from the copper-based paradigm1-3 carries profound implications for elucidating mechanisms behind superconductivity and may also enable new applications4-8. Here, our investigation reveals that application of pressure effectively suppresses the spin and charge order in trilayer nickelate La4Ni3O10-δ single crystals, leading to the emergence of superconductivity with a maximum critical temperature (Tc) of around 30 K at 69.0 GPa. The DC susceptibility measurements confirm a substantial diamagnetic response below Tc, indicating the presence of bulk superconductivity with a volume fraction exceeding 80%. In the normal state, we observe a "strange metal" behavior, characterized by a linear temperature-dependent resistance extending up to 300 K. Furthermore, the layer-dependent superconductivity observed hints at a unique interlayer coupling mechanism specific to nickelates, setting them apart from cuprates in this regard. Our findings provide crucial insights into the fundamental mechanisms underpinning superconductivity, while also introducing a new material platform to explore the intricate interplay between the spin/charge order, flat band structures, interlayer coupling, strange metal behavior and high-temperature superconductivity. © 2023, CC BY-NC-ND.

关键词： Single crystals

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Accelerating Convolutional Neural Network Inference Based on a Reconfigurable Sliced Systolic Array

Accelerating Convolutional Neural Network Inference Based on...

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IEEE International Symposium on Circuits and systems

作者： Yixuan Zeng Heming Sun Jiro Katto Yibo Fan State Key Laboratory of ASIC and System Fudan University China Waseda Research Institute for Science and Engineering Waseda University Japan JST PRESTO Japan Graduate School of Fundamental Science and Engineering Waseda University Japan

Convolutional neural networks (CNNs) have achieved great successes on many computer vision tasks, such as image recognition, video processing, and target detection. In recent years, many hardware designs have been devoted to accelerating CNN inference. In order to further speed up CNN inference and reduce data waste, this work proposed a reconfigurable sliced systolic array: 1) Depending on the number of network nodes in each layer, the slice mode could be dynamically configured to achieve high throughput and resource utilization. 2) To take full advantage of convolution reuse and weight reuse, this work designed a tile-column sliding (TCS) processing dataflow. 3) A four-stage for loop algorithm was employed, which divides the CNN calculation into several parts based on the input nodes and output nodes. The entire CNN inference is carried out using integer-only arithmetic originated from TensorLite. Experimental results prove that these strategies lead to significant improvement in inference performance and energy efficiency.

关键词： Convolution Throughput Energy efficiency Inference algorithms Convolutional neural networks Acceleration Task analysis

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研究（英文） 2020年第2期 277-286页

作者： Shuiyuan Wang Xiang Hou Lan Liu Jingyu Li Yuwei Shan Shiwei Wu David Wei Zhang Peng Zhou ASIC & System State Key Lab. School of Microelectronics Fudan University Shanghai 200433 China Department of Physics State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China

The von Neumann bottleneck has spawned the rapid expansion of neuromorphic engineering and brain-like *** serve as bridges for information transmission and connection in the biological nervous *** direct implementation of neural networks may depend on novel materials and devices that mimic natural neuronal and synaptic *** exploiting the interfacial effects between MoS2 and AlOx,we demonstrate that an h-BN-encapsulated MoS2 artificial synapse transistor can mimic the basic synaptic behaviors,including EPSC,PPF,LTP,and *** optoelectronic spikes enable simulation of synaptic gain,frequency,and weight *** Pavlov classical conditioning experiment was successfully simulated by electrical tuning,showing associated learning *** addition,h-BN encapsulation effectively improves the environmental time stability of our *** h-BN-encapsulated MoS2 artificial synapse provides a new paradigm for hardware implementation of neuromorphic engineering.

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Charge transport and quantum confinement in MoS2 dual-gated transistors

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Journal of Semiconductors 2020年第7期41卷 39-43页

作者： Fuyou Liao Hongjuan Wang Xiaojiao Guo Zhongxun Guo Ling Tong Antoine Riaud Yaochen Sheng Lin Chen Qingqing Sun Peng Zhou David Wei Zhang Yang Chai Xiangwei Jiang Yan Liu Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an 710071China Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina

Semiconductive two dimensional(2D)materials have attracted significant research attention due to their rich band structures and promising potential for next-generation electrical *** this work,we investigate the MoS2 field-effect transistors(FETs)with a dual-gated(DG)architecture,which consists of symmetrical thickness for back gate(BG)and top gate(TG)*** thickness-dependent charge transport in our DG-MoS2 device is revealed by a four-terminal electrical measurement which excludes the contact influence,and the TCAD simulation is also applied to explain the experimental *** results indicate that the impact of quantum confinement effect plays an important role in the charge transport in the MoS2 channel,as it confines charge carriers in the center of the channel,which reduces the scattering and boosts the mobility compared to the single gating ***,temperature-dependent transfer curves reveal that multi-layer MoS2 DG-FET is in the phonon-limited transport regime,while single layer MoS2 shows typical Coulomb impurity limited regime.

关键词： MoS2 field effect transistors dual-gate quantum confinement Coulomb impurity

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A 23-34 GHz Wideband GaN Low-Noise Amplifier for 5G Millimeter-Wave Applications

A 23-34 GHz Wideband GaN Low-Noise Amplifier for 5G Millimet...

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IEEE International Workshop on Electromagnetics, Applications and Student Innovation (iWEM)

作者： Yubin Li Xueying Wu Jun Hu Xiuyin Zhang Yun Yin Hongtao Xu State Key Laboratory of ASIC and System Fudan University Shanghai China Pazhou Lab Guangzhou China School of Electronic and Information Engineering South China University of Technology South China University of Technology Guangzhou China

ISBN: (纸本)9781665418294

This paper presents a design of 23-34 GHz wideband low-noise amplifier (LNA) based on gallium-nitride (GaN) technology. The LNA circuit employs an input matching network with few components and particularly reduces the noise of the second stage at the high frequency, which makes the circuit achieve sub-1dB noise performance in the whole bandwidth, while completing noise and impedance matching. Because inductive peaking technique and stagger tuning technique are adopted, the small-signal gain of the LNA is from 22.1 dB to 25.2 dB over the whole bandwidth. With 30.9 dBm maximum output-referred third-order intercept point (OIP3) and 42 dBm maximum input power (P in,max ), the LNA also achieves high linearity and high reliability.

关键词： Low-noise amplifiers Technological innovation Impedance matching Simulation Linearity Reliability High frequency

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Beyond 60G SSB-FBMC signals transmission for Fiber-THz integrated system using simplified parallel Kramers-Kronig receiver

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Optics & Laser Technology 2025年 191卷

作者： Long Zhang Jianjun Yu Xiongwei Yang Jianyu Long Chengzhen Bian Jingtao Ge Min Zhu Jiao Zhang Kaihui Wang Wen Zhou Purple Mountain Laboratories Southeast University Nanjing 211111 China State Key Laboratory of ASIC and System Key Laboratory for Information Science of Electromagnetic Waves (MoE) and the School of Information Science and Technology Fudan University Shanghai 200433 China Purple Mountain Laboratories Nanjing 211111 China

Simplifying coherent detection technology is a potential solution to save the cost of receivers in ultra-high data rate photon-assisted terahertz (THz) communication systems. A key issue when using an envelope detector to simplify the system is that the generation of signal-signal beat interference (SSBI) reduces the signal-to-noise ratio. The Kramers-Kronig (KK) receiver can effectively eliminate SSBI. In this paper, we propose and demonstrate a simplified parallel KK (SP-KK) receiver. The key idea is to use the Taylor expansion approximation instead of the nonlinear operation that significantly broadens the spectrum, and to use a multiplier-free finite impulse response (FIR) filter to approximate the Hilbert transform (HT). We evaluate the performance of the proposed SP-KK receiver in a single-channel 63.1 Gb/s transmission at 0.1 THz over 10-km wired and 3-m wireless links by using the envelope detection for 16-QAM filter bank multicarrier (FBMC) signals. The experimental results show that the proposed SP-KK receiver exhibits similar performance to the conventional HT-based KK (HT-KK) receiver.

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Correlations between polarization and structural information of supertetragonal PbTiO3

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Physical Review B 2022年第2期105卷 024106-024106页

作者： Feng Zhang Jiale Zhang Hongmei Jing Zhipeng Li Dawei Wang Chun-Lin Jia School of Microelectronics and State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China Key Lab of Micro-Nano Electronics and System Integration of Xi'an City Xi'an Jiaotong University Xi'an 710049 China School of Physics and Information Technology Shaanxi Normal University Xi'an 710062 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Ernst Ruska Center for Microscopy and Spectroscopy with Electrons Research Center Jülich D-52425 Jülich Germany

The huge axial ratio of supertetragonal perovskites can induce large polarization due to the coupling between the unit cell and ion displacements, which often results in higher Curie temperature or better ferroelectric properties. With the progress of vertical strain engineering, experimentally available supertetragonal PbTiO3 raises much interest in the relation between its intrinsic polarization and structural characteristics, such as the axial ratio and ion displacements that can be obtained with a high-resolution (scanning) transmission electron microscope nowadays. However, the interpretation and use of such obtained structural information are not without peril. Here, employing first-principles calculations, we report on the relationship between the polarization and the structural information for supertetragonal PbTiO3. Our investigation shows that, unlike normal PbTiO3, the strong sublinear correlation raises the difficulty to quantitatively estimate the spontaneous polarization for the axial ratio larger than 1.15. In addition, the relative displacement between cations (i.e., Pb and Ti) proves to be an unsuitable structural parameter to determine the spontaneous polarization, emphasizing the importance of obtaining the positions of anions, albeit presumably more difficult, along with cations.

关键词： Ferroelectricity Ferroelectrics Perovskites Density functional calculations First-principles calculations Scanning transmission electron microscopy Strain engineering

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Near-Infrared Heterojunction Field Modulated Phototransistors with Distinct Photodetection/Photostorage Switching Feature for Artificial Visuals

Research Square

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Research Square 2021年

作者： Han, Jiayue Du, Xiaoyang Zhang, Zhenghan He, Zeyu Xie, Runzhang Shan, Chongxin Tao, Silu Hu, Weida Yang, Ming Gou, Jun Wu, Zhiming Jiang, Yadong Wang, Jun School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Science 500 Yutian Road Shanghai200083 China Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and Engineering Zhengzhou University Zhengzhou450001 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China

With the rising demand of recording, computing and image capture, advanced optoelectronic detection, storage and logic devices are highly pursued. Nevertheless, multi-functional vision chip based on infrared detection and memory switching has never been demonstrated. Here, by utilizing the electronic extraction layer ZnO and face-on orientation of D-A, we exhibit the broadband visible to near-infrared photo-response and photo-storage characters on graphene phototransistor. Functions as photodetection and photo-storage can be switched with the variation of gate voltage. The device demonstrates high photo-responsivity up to 1.88×106 A/W at 895 nm corresponding detectivity of 4.8×1012 Jones. Importantly, the rewritable and switching infrared optoelectronic memory function can be achieved with good retention over 104 s. The both retinomorphic vision and memorial preprocessing in artificial visual are simultaneously realized by photodetection/photostorage switching property. Such nearly all-solution processes in our phototransistors may open up the path for the large-scale and easy manufacturing infrared multifunctional bio-optoelectronic device. © 2021, CC BY.

关键词： Graphene

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Two-Dimensional Organic-Inorganic Room-Temperature Multiferroic

arXiv

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arXiv 2022年

作者： Yang, Yali Ji, Junyi Feng, Junsheng Chen, Shiyou Bellaiche, Laurent Xiang, Hongjun Institute of Computational Physical Sciences Department of Physics Fudan University Shanghai200433 China Shanghai Qi Zhi Institute Shanghai200030 China School of Physics and Materials Engineering Hefei Normal University Hefei230601 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai200433 China Physics Department Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Organic-inorganic multiferroics are promising for the next generation of electronic devices. To date, dozens of organic-inorganic multiferroics have been reported;however, most of them show magnetic Curie temperature much lower than room temperature, which drastically hampers their application. Here, by performing first-principle calculations and building effective model Hamiltonians, we reveal a molecular orbital-mediated magnetic coupling mechanism in two-dimensional Cr(pyz)2 (pyz=pyrazine), and the role that the valence state of the molecule plays in determining the magnetic coupling type between metal ions. Based on these, we demonstrate that a two-dimensional organic-inorganic room-temperature multiferroic, Cr(h-fpyz)2 (h-fpyz= half-fluoropyrazine), can be rationally designed by introducing ferroelectricity in Cr(pyz)2 while keeping the valence state of the molecule unchanged. Our work not only reveals the origin of magnetic coupling in 2D organic-inorganic systems, but also provides a way to design room temperature multiferroic materials rationally. Copyright © 2022, The Authors. All rights reserved.

关键词： Metal ions

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