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Macroscopic assembled graphene nanofilms based room temperature ultrafast mid-infrared photodetectors

InfoMat 2022年第6期4卷 129-140页

作者： Li Peng Lixiang Liu Sichao Du Srikrishna Chanakya Bodepudi Lingfei Li Wei Liu Runchen Lai Xiaoxue Cao Wenzhang Fang Yingjun Liu Xinyu Liu Jianhang Lv Muhammad Abid Junxue Liu Shengye Jin Kaifeng Wu Miao-Ling Lin Xin Cong Ping-Heng Tan Haiming Zhu Qihua Xiong Xiaomu Wang Weida Hu Xiangfeng Duan Bin Yu Zhen Xu Yang Xu Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang UniversityHangzhouChina School of Micro-nanoelectronics State Key Laboratory of Silicon MaterialsHangzhou Global Scientific and Technological Innovation CenterZJU-UIUC Joint InstituteZhejiang UniversityHangzhouChina State Key Laboratory of Molecular Reaction Dynamics and Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina Department of Chemistry Zhejiang UniversityHangzhouChina Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructureSchool of Electronic Science and EngineeringNanjing UniversityNanjingChina State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina Department of Chemistry and Biochemistry California Nanosystems InstituteUniversity of CaliforniaLos AngelesCaliforniaUSA

Graphene with linear energy dispersion and weak electron-phonon interaction is highly anticipated to harvest hot electrons in a broad wavelength ***,the limited absorption and serious backscattering of hot-electrons result in inadequate quantum yields,especially in the mid-infrared ***,we report a macroscopic assembled graphene(nMAG)nanofilm/silicon heterojunction for ultrafast mid-infrared *** assembled Schottky diode works in 1.5-4.0μm at room temperature with fast response(20-30 ns,rising time,4 mm2 window)and high detectivity(1.61011 to 1.9109 Jones from 1.5 to 4.0μm)under the pulsed laser,outperforming single-layer-graphene/silicon photodetectors by 2-8 *** performances are attributed to the greatly enhanced photo-thermionic effect of electrons in nMAG due to its high light absorption(~40%),long carrier relaxation time(~20 ps),low work function(4.52 eV),and suppressed carrier number *** nMAG provides a long-range platform to understand the hot-carrier dynamics in bulk 2D materials,leading to broadband and ultrafast MIR active imaging devices at room temperature.

关键词： graphene nanofilm heterojunction macro-assembly mid-infrared photodetector photothermionic effect

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Targeting pro-inflammatory T cells as a novel therapeutic approach to potentially resolve atherosclerosis in humans

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细胞研究（英文版） 2024年第6期34卷 407-427页

作者： Lin Fan Junwei Liu Wei Hu Zexin Chen Jie Lan Tongtong Zhang Yang Zhang Xianpeng Wu Zhiwei Zhong Danyang Zhang Jinlong Zhang Rui Qin Hui Chen Yunfeng Zong Jianmin Zhang Bing Chen Jun Jiang Jifang Cheng Jingyi Zhou Zhiwei Gao Zhenjie Liu Ying Chai Junqiang Fan Pin Wu Yinxuan Chen Yuefeng Zhu Kai Wang Ying Yuan Pintong Huang Ying Zhang Huiqin Feng Kaichen Song Xun Zeng Wei Zhu Xinyang Hu Weiwei Yin Wei Chen Jian'an Wang Department of Cardiology The Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina Cardiovascular Key Laboratory of Zhejiang Province HangzhouZhejiangChina Research Center for Life Science and Human Health Binjiang Institute of Zhejiang UniversityHangzhouZhejiangChina Department of Cell Biology Zhejiang University School of Medicineand Liangzhu LaboratoryZhejiang UniversityHangzhouZhejiangChina Key Laboratory for Biomedical Engineering of the Ministry of Education College of Biomedical Engineering and Instrument ScienceZhejiang UniversityHangzhouZhejiangChina Guangzhou National Laboratory GuangzhouGuangdongChina Department of Cell Biology Zhejiang University School of Medicineand Liangzhu LaboratoryZhejiang UniversityHangzhouZhejiangChina Kidney Disease Center The First Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina Center of Clinical Epidemiology and Biostatistics and Department of Scientific Research The Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina National Laboratory of Biomacromolecules Institute of BiophysicsUniversity of Chinese Academy of SciencesBeijingChina Department of Bioinformatics The Basic Medical School of Chongqing Medical UniversityChongqingChina Department of Cell Biology Zhejiang University School of Medicineand Liangzhu LaboratoryZhejiang UniversityHangzhouZhejiangChina Department of Hepatobiliary and Pancreatic Surgery The Center for Integrated Oncology and Precision MedicineAffiliated Hangzhou First People's HospitalZhejiang University School of MedicineHangzhouZhejiangChina Department of Cardiology The Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina Department of Cardiology The Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina Cardiovascular Key Laboratory of Zhejiang Province HangzhouZhejiangChina Department of Cell Biology Zhejiang University School of Me

Atherosclerosis(AS),a leading cause of cardio-cerebrovascular disease worldwide,is driven by the accumulation of lipid contents and chronic *** strategies primarily focus on lipid reduction to control AS progression,leaving residual inflammatory risks for major adverse cardiovascular events(MACEs).While anti-inflammatory therapies targeting innate immunity have reduced MACEs,many patients continue to face significant *** key component in AS progression is adaptive immunity,but its potential role in preventing AS remains *** investigate this,we conducted a retrospective cohort study on tumor patients with AS *** found that anti-programmed cell death protein 1(PD-1)monoclonal antibody(mAb)significantly reduces AS plaque *** multi-omics single-cell analyses,we comprehensively characterized AS plaque-specific PD-1+T cells,which are activated and *** demonstrated that anti-PD-1 mAb,when captured by myeloid-expressed Fc gamma receptors(FcyRs),interacts with PD-1 expressed on T *** interaction turns the anti-PD-1 mAb into a substitute PD-1 ligand,suppressing T-cell functions in the PD-1 ligands-deficient context of AS ***,we conducted a prospective cohort study on tumor patients treated with anti-PD-1 mAb with or without Fc-binding *** analysis shows that anti-PD-1 mAb with Fc-binding capability effectively reduces AS plaque size,while anti-PD-1 mAb without Fc-binding capability does *** work suggests that T cell-targeting immunotherapy can be an effective strategy to resolve AS in humans.

关键词： resolve cells novel approach atherosclerosis humans inflammatory potentially targeting therapeutic

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Stochastic homogenization of nonlinear evolution equations with space-time nonlocality

arXiv

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arXiv 2023年

作者： Chen, Junlong Tang, Yanbin School of Mathematics and Statistics Huazhong University of Science and Technology Hubei Wuhan430074 China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Hubei Wuhan430074 China

In this paper we consider the homogenization problem of nonlinear evolution equations with space-time non-locality, the problems are given by Beltritti and Rossi [JMAA, 2017, 455: 1470-1504]. When the integral kernel J(x,t;y,s) is re-scaled in a suitable way and the oscillation coefficient ν(x,t;y,s) possesses periodic and stationary structure, we show that the solutions uΕ(x,t) to the perturbed equations converge to u0(x,t), the solution of corresponding local nonlinear parabolic equation as scale parameter Ε → 0+. Then for the nonlocal linear index p = 2 we give the convergence rate such that (formula presented). Furthermore, we obtain that the normalized difference (formula presented) converges to a solution of an SPDE with additive noise and constant coefficients. Finally, we give some numerical formats for solving non-local space-time homogenization. Copyright © 2023, The Authors. All rights reserved.

关键词： Additive noise

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Higher-Order Topological In-Bulk Corner State in Pure Diffusion Systems

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Physical Review Letters 2024年第17期132卷 176302-176302页

作者： Zhoufei Liu Pei-Chao Cao Liujun Xu Guoqiang Xu Ying Li Jiping Huang Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Shanghai 200438 China State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Zhejiang University Haining 314400 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China Graduate School of China Academy of Engineering Physics Beijing 100193 China Department of Electrical and Computer Engineering National University of Singapore Kent Ridge 117583 Republic of Singapore

Compared with conventional topological insulator that carries topological state at its boundaries, the higher-order topological insulator exhibits lower-dimensional gapless boundary states at its corners and hinges. Leveraging the form similarity between Schrödinger equation and diffusion equation, research on higher-order topological insulators has been extended from condensed matter physics to thermal diffusion. Unfortunately, all the corner states of thermal higher-order topological insulator reside within the band gap. Another kind of corner state, which is embedded in the bulk states, has not been realized in pure diffusion systems so far. Here, we construct higher-dimensional Su-Schrieffer-Heeger models based on sphere-rod structure to elucidate these corner states, which we term “in-bulk corner states.” Because of the anti-Hermitian properties of diffusive Hamiltonian, we investigate the thermal behavior of these corner states through theoretical calculation, simulation, and experiment. Furthermore, we study the different thermal behaviors of in-bulk corner state and in-gap corner state. Our results would open a different gate for diffusive topological states and provide a distinct application for efficient heat dissipation.

关键词： Fourier's law Heat transfer Metamaterials

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SAMPLE PATH MDP FOR THE CURRENT AND THE TAGGED PARTICLE IN THE SSEP

arXiv

引用

arXiv 2023年

作者： Xue, Xiaofeng Zhao, Linjie School of Mathematics and Statistics Beijing Jiaotong University Beijing100044 China School of Mathematics and Statistics Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China

We prove sample path moderate deviation principles (MDP) for the current and the tagged particle in the symmetric simple exclusion process, which extends the results in [39], where the MDP was only proved at any fixed...

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MMPI: a Flexible Radiance Field Representation by Multiple Multi-plane Images Blending

MMPI: a Flexible Radiance Field Representation by Multiple M...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： Yuze He Peng Wang Yubin Hu Wang Zhao Ran Yi Yong-Jin Liu Wenping Wang Department of Computer Science and Technology MOE-Key Laboratory of Pervasive Computing Tsinghua University China Department of Computer Science The University of Hong Kong Hong Kong Department of Computer Science and Engineering Shanghai Jiao Tong University China Department of Computer Science and Engineering Texas A&M University USA

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

This paper presents a flexible representation of neural radiance fields based on multi-plane images (MPI), for high-quality view synthesis of complex scenes. MPI with Normalized Device Coordinate (NDC) parameterization is widely used in NeRF learning for its simple definition, easy calculation, and powerful ability to represent unbounded scenes. However, existing NeRF works that adopt MPI representation for novel view synthesis can only handle simple forward-facing unbounded scenes (e.g., the scenes in the LLFF dataset), where the input cameras are all observing in similar directions with small relative translations. Hence, extending these MPIbased methods to more complex scenes like large-range or even 360-degree scenes is very challenging. In this paper, we explore the potential of MPI and show that MPI can synthesize high-quality novel views of complex scenes with diverse camera distributions and view directions, which are not only limited to simple forward-facing scenes. Our key idea is to encode the neural radiance field with multiple MPIs facing different directions and blend them with an adaptive blending operation. For each region of the scene, the blending operation gives larger blending weights to those advantaged MPIs with stronger local representation abilities while giving lower weights to those with weaker representation abilities. Such blending operation automatically modulates the multiple MPIs to appropriately represent the diverse local density and color information. Experiments on the KITTI dataset and ScanNet dataset demonstrate that our proposed MMPI synthesizes high-quality images from diverse camera pose distributions and is fast to train, outperforming the previous fast-training NeRF methods for novel view synthesis. Moreover, we show that MMPI can encode extremely long trajectories and produce novel view renderings, demonstrating its potential in applications like autonomous driving. Our demo video is available at https://***/watch?v

关键词： Image color analysis Neural radiance field Cameras Rendering (computer graphics) Reliability engineering Trajectory Robotics and automation

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Device Activity Detection in mMTC with Low-Resolution ADC: A New Protocol

arXiv

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arXiv 2023年

作者： Wang, Zhaorui Liu, Ya-Feng Wang, Ziyue Liu, Liang Pan, Haoyuan Cui, Shuguang The Future Network of Intelligence Institute The School of Science and Engineering The Chinese University of Hong Kong Shenzhen518172 China The State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China The Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong College of Computer Science and Software Engineering Shenzhen University Shenzhen China

This paper investigates the effect of low-resolution analog-to-digital converters (ADCs) on device activity detection in massive machine-type communications (mMTC). The low-resolution ADCs induce two challenges on the device activity detection compared with the traditional setup with the assumption of infinite ADC resolution. First, the codebook design for signal quantization by the low-resolution ADC is particularly important since a good design of the codebook can lead to small quantization error on the received signal, which in turn has significant influence on the activity detector performance. To this end, prior information about the received signal power is needed, which depends on the number of active devices K. This is sharply different from the activity detection problem in traditional setups, in which the knowledge of K is not required by the BS as a prerequisite. Second, the covariance-based approach achieves good activity detection performance in traditional setups while it is not clear if it can still achieve good performance in this paper. To solve the above challenges, we propose a communication protocol that consists of an estimator for K and a detector for active device identities: 1) For the estimator, the technical difficulty is that the design of the ADC quantizer and the estimation of K are closely intertwined and doing one needs the information/execution from the other. We propose a progressive estimator which iteratively performs the estimation of K and the design of the ADC quantizer;2) For the activity detector, we propose a custom-designed stochastic gradient descent algorithm to estimate the active device identities. Numerical results demonstrate the effectiveness of the communication protocol. © 2023, CC BY.

关键词： Stochastic systems

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Stepwise ionization of Mo14+ ions in an electron-beam ion trap: The importance of the metastable level

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Physical Review A 2025年第4期111卷 042818-042818页

作者： Cunqiang Wu Xiaobin Ding Qi Guo Jialin Liu Ke Yao Yunqing Fu Chenzhong Dong Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China Gansu International Scientific and Technological Cooperation Base of Laser Plasma Spectroscopy Lanzhou 730070 China Gansu Provincial Research Center for Basic Disciplines of Quantum Physics Lanzhou 730070 China Shanghai EBIT Laboratory and Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 China

The visible spectrum of Mo15+ ions was measured using a room-temperature permanent magnet electron-beam ion trap at the Shanghai EBIT laboratory, with an electron-beam energy Ee=400eV, which is significantly below the ionization potential (IP=544.0 eV) of the Mo14+ ions in the ground configuration 3p63d10. To provide a detailed explanation of the experiment, we calculated the energy-level structure, radiative transition properties, electron-impact excitation, and electron-impact ionization cross sections for both the ground state and low-lying excited states of the Mo14+ ions using the Dirac-Fock-Slater method with a local central potential and the distorted-wave approximation. The results show good agreement with both experimental and theoretical data available in the literature. Through an analysis of the relevant atomic processes of Mo14+ ions, a scenario involving the stepwise ionization via the metastable configuration 3p63d94s was proposed to explain the presence of the Mo15+ ions for electron energies below the ionization threshold. The study confirms the importance of metastable states in ionization processes, and provides new insights into their ionization mechanisms, which will be valuable for future studies of EBIT and similar plasma environments.

关键词： Ground state

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HEISENBERG UNIQUENESS PAIRS AND THE WAVE EQUATION

arXiv

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arXiv 2023年

作者： Huang, Shanlin Yu, Jiaqi School of Mathematics and Statistics Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan430074 China

Given a curve Γ and a set Λ in the plane, the concept of the Heisenberg uniqueness pair (Γ, Λ) was first introduced by Hedenmalm and Motes-Rodrígez (Ann. of Math. 173(2),1507-1527, 2011, [11]) as a variant of the uncertainty principle for the Fourier transform. The main results in [11] concern the hyperbola Γ∊ = {(x1, x2) ∈ 2, x1x2 = ∊} (0 ≠ ∊ ∈ ) and lattice-crosses Λαβ = (α× {0}) ∪ ({0} × β) (α, β > 0), where it’s proved that (Γ∊, Λαβ) is a Heisenberg uniqueness pair if and only if αβ ≤ 1/|∊|. In this paper, we aim to study the endpoint case (i.e., ∊ = 0 in Γ∊) and investigate the following problem: what’s the minimal amount of information required on Λ (the zero set) to form a Heisenberg uniqueness pair? When Λ is contained in the union of two curves in the plane, we give characterizations in terms of some dynamical system conditions. The situation is quite different in higher dimensions and we obtain characterizations in the case that Λ is the union of two hyperplanes. Copyright © 2023, The Authors. All rights reserved.

关键词： Dynamical systems

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Predictive ISAC Beamforming Using LoRA-Transformer LSTM Integrated with GNN in Ultra-Dense D2D mmWave Networks

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IEEE Transactions on Vehicular Technology 2025年

作者： Liu, Haochen Bi, Jia Li, Bohan Xiang, Luping Yang, Xin Zhang, Zhaolin Wang, Ling Northwestern Polytechnical University School of Electronics and Information Xi'an710019 China Rutherford Appleton Laboratory Scientific Computing Department STFC DidcotOX11 0QX United Kingdom Ocean University of China Faculty of Information Science and Engineering Qingdao266100 China Nanjing University State Key Laboratory of Novel Software Technology Nanjing210008 China School of Intelligent Software and Engineering Suzhou China

Effective beamforming is crucial in ultra-dense device-to-device (D2D) mmWave networks to reduce interference and optimize communication. However, current methods often struggle to balance high data rates with minimal signaling overhead, especially with imperfect channel state information (CSI). This paper introduces a machine learning-assisted beamforming design tailored for integrated sensing and communication (ISAC), combining an efficient Low-Rank Adaptation Blocked LSTM Transformer with Message Passing Graph Neural Network that is called as LoRA_BLT-MPGNN. The LoRA_BLT component provides a key advantage by efficiently capturing both temporal and spatial patterns through fixed-weight updates during training and low-rank approximation for fine-tuning, significantly reducing computational complexity without sacrificing accuracy. Using historical channel data, the method implicitly captures channel characteristics and directly predicts the beamforming matrix for the subsequent time slot, minimizing signaling overhead while maximizing the achievable sum rate. Our research and simulation results show that the proposed predictive beamforming design maintains robust sensing performance and achieves a sum rate closely approaching the upper bound achievable with perfect CSI. Additionally, the incorporation of MPGNNs enables efficient modeling and learning of complex inter-node relationships, making the approach adaptable to networks of varying sizes and densities. Simulations further demonstrate that the LoRA_BLT-MPGNN model can be generalized across different network densities and coverage areas, reducing computational complexity by approximately 32× in terms of Tensor Floating Point Operations (TFLOPs) compared to conventional methods while maintaining high performance. © 2025 IEEE.

关键词： Beamforming

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