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Ultrafast multiexciton dynamics in molecular systems: Inclusion of exciton-exciton annihilation

Physical Review B 2023年第13期107卷 134301-134301页

作者： Xuyang Fan An Wei Tillmann Klamroth Yuan Zhang Kun Gao Luxia Wang Department of Physics Institute of Theoretical Physics University of Science and Technology Beijing Beijing 100083 China Institute of Chemistry University of Potsdam Karl-Liebknecht-str.24-25 14476 Potsdam-Golm Germany Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material Physics Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou 450052 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

We report simulations of exciton-exciton annihilation (EEA) in dye molecular aggregates with explicit laser pulse excitation in the framework of reduced density matrix theory. We use a supramolecular complex model Hamiltonian, in which each monomer of an aggregate is described by three electronic levels. An expectation value approximation is used to avoid the large amount of matrix elements for various exciton configuration distributions in molecular aggregates. Quantum fluctuations truncation is applied to derive the closed equations of motion for single- and two-site functions. Using these equations, we simulate the laser pulse driven EEA dynamics, and compare it with rate equations to highlight the importance of quantum coherence effects. We also discuss the effects of the aggregate configuration, the molecular transition dipoles and the duration of laser pulses on EEA. Furthermore, we analyze the relation between the coherence time of fusion and the annihilation process. Our study indicates that EEA process is more efficient for coherent excitation at the lowest energy level in J aggregates. Our simulation of the normalized population of the first excited state for various field amplitudes can qualitatively reproduce time-resolved experimental emission spectra. This confirms that the fundamental description of laser pulse induced EEA is correct within our model.

关键词： Effects of atomic coherence on light propagation Light-matter interaction Nonlinear optics Optical coherence Quantum optics Molecules Electric moment Dipole approximation Electronic structure Quantum theory Rotating wave approximation

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A Low-Jitter and Low-Reference-Spur 320 GHz Signal Source With an 80 GHz Integer-N Phase-Locked Loop Using a Quadrature XOR Technique

A Low-Jitter and Low-Reference-Spur 320 GHz Signal Source Wi...

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作者： Liang, Yuan Boon, Chirn Chye Qi, Gengzhen Dziallas, Giannino Kissinger, Dietmar Ng, Herman Jalli Mak, Pui-In Wang, Yong Nanyang Technological University School of Electrical and Electronic Engineering Singapore639798 Singapore Sun Yat-sen University School of Microelectronics Science and Technology Zhuhai519082 China State-Key Laboratory of Analog and Mixed-Signal VLSI Institute of Microelectronics University of Macau China Leibniz Institute for High Performance Microelectronics Frankfurt an der Oder 15236 Germany Institute of Electronic Devices and Circuits Ulm University Ulm89081 Germany Karlsruhe University of Applied Sciences Faculty of Electrical Engineering and Information Technology Karlsruhe76133 Germany University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu611731 China Nanhu Laboratory Jiaxing314002 China

This article reports a 320-GHz low-jitter and low-reference-spur signal source consisting of an 80-GHz integer- N phase-locked loop (PLL) and a 320-GHz frequency quadrupler. The 80-GHz PLL features a novel dual-path quadrature exclusive-OR (QXOR) technique to cancel the spurs at the reference frequency and its harmonics, enabling low-spur and low-noise phase locking. The proposed phase detector (PD) also enables frequency detection and lock detection (LD), rendering the band-searching to be decoupled from the loop components. Implemented in a 0.13- \mu \text{m} SiGe BiCMOS technology, the proposed signal source shows a -73.1-dBc reference spur, -113.7-dB/Hz phase noise at 1-MHz offset at 40.96 GHz, and -90.3-dB/Hz phase noise at 1-MHz offset at 311.8 GHz. It achieves an integrated jitter of 66.9 fsrms at 40.96 GHz and 122 fsrms (both integrated from 10 kHz to 100 MHz) beyond 300 GHz, with a total division ratio of 512. The LD time is at the microsecond level. The maximum output power is -3.24 dBm, and the power consumption is 372 mW. © 1963-2012 IEEE.

关键词： Phase locked loops

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180nm BCD technology Platform with 8V to 65V Isolated LDMOS

180nm BCD Technology Platform with 8V to 65V Isolated LDMOS

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International Conference on Solid-State and Integrated Circuit technology

作者： Qi Ding Renxiong Li Ning Ning Jun Huang Yutuo Guo Yu Wang Kunqin He Yaxin Liu Huaishan Wang Juan Tang Qiuyue Huo Minghong Yuan Pan Peng Ming Qiao Lulu Peng Bo Zhang United Microelectronics Center Co. Ltd Chongqing China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China Institute of Electronic and Information Engineering of UESTC in Guangdong Dongguan China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen China

This work presents a 180nm BCD technology platform with 1.8V/5V CMOS, BJT, 8-65V isolated LDMOS (Lateral Double-Diffused MOSFET) and other devices such as diodes, resistors, capacitors etc., which possesses competitiv... 详细信息

ISBN: (数字)9798350361834

ISBN: (纸本)9798350361841

关键词： Resistors Performance evaluation MOSFET Capacitors CMOS technology Libraries Substrates

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Ambient-stable Mg2+-doped Cs3Cu2I5 nanocrystals with enhanced photoluminescence for color conversion blue LEDs

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Optics letters 2025年第12期50卷 3840-3843页

作者： Xuanming Zhang Yang Tang Chenfeng Lin Hao Xie Ronglei Fan Dongdong Yan Xiaoyu Wang Yongfeng Liu Weixiang Ye School of Physics and Optoelectronic Engineering Hainan University Haikou 570228 China Jiangsu Key Laboratory of Frontier Material Physics and Devices School of Physical Science and Technology Soochow University Suzhou 215006 China College of Physical Science and Technology & Microelectronics Industry Research Institute Yangzhou University Yangzhou 225002 China liuyf@*** Center for Theoretical Physics Hainan University Haikou 570228 China wxy@***

We successfully synthesized Mg-doped CsCuI nanocrystals (NCs) under ambient conditions. The 10% Mg-doped CsCuI NCs exhibit significantly enhanced optical properties, achieving a photoluminescence quantum yield (PLQY) of 25.80% and a narrow emission full width at half maximum (FWHM) of 78 nm. The 10% Mg-doped NCs also exhibited improved thermal and water stability, retaining 67% of their initial photoluminescence (PL) intensity when heated from 25°C to 100°C and maintaining blue light emission after 30 min in aqueous environments. When integrated into a color conversion LED, these NCs achieved simultaneous improvements in emission characteristics, showing a narrowed FWHM (81 nm) and higher emission efficiency compared to undoped counterparts.

关键词： Blue light emitting diodes Green light emitting diodes Optical properties Photoluminescence Red light emitting diodes Ultraviolet light emitting diodes

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Nondestructive visualization of graphene on Pt with methylene blue surface modification

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science China Materials 2022年第10期65卷 2763-2770页

作者： He Kang Yanhui Zhang Yun Wu Shike Hu Jing Li Zhiying Chen Yanping Sui Shuang Wang Sunwen Zhao Runhan Xiao Guanghui Yu Songang Peng Zhi Jin Xinyu Liu State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing Electronic Device InstituteNanjing 210016China Microwave Devices and Integrated Circuits Department Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

Efficient large-scale nondestructive quality assessment of graphene on Pt is essential to the in-depth growth research and practical applications of ***,we present a very simple method for directly observing the domains and defects in graphene on Pt using an ordinary optical *** was achieved by modifying graphene on Pt using methylene blue(MB).Because the chemical activities of graphene and Pt surface differ significantly,the adsorption and reaction of MB on graphene and platinum surface *** can determine the distribution of graphene crystal domains and defects by comparing the colors in the optical *** addition,this characterization method causes no obvious damage to the Pt substrate and ***,it does not affect the recycling of the substrate or the subsequent characterization or application of *** study provides a nondestructive method for measuring the quality of graphene on Pt on a large scale,as well as a reference for the characterization and doping of other two-dimensional materials.

关键词： graphene Pt nondestructive visualization surface modification methylene blue

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Super-Heisenberg scaling in a triple point criticality

arXiv

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arXiv 2024年

作者： Cheng, Jia-Ming Zhang, Yong-Chang Zhou, Xiang-Fa Zhou, Zheng-Wei Xi’an Microelectronics Technology Institute Xi’an710065 China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Key Laboratory of Quantum Information and Quantum Optoelectronic Devices School of Physics Xi’an Jiaotong University Xi’an710049 China CAS Key Lab of Quantum Information University of Science and Technology of China Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China

We investigate quantum-enhanced metrology in a triple point criticality and discover that quantum criticality does not always enhance measurement precision. We have developed suitable adiabatic evolution protocols to effectively restrain excitations, which could accelerate the adiabatic evolutions and lead to an exponential super-Heisenberg scaling. This scaling behavior is quite valuable in practical parameter estimating experiments with limited coherence time. Dissipation can strengthen the super-Heisenberg scaling until decoherence increases to dominate in the dissipative dynamics. Additionally, measurement precisions beyond Heisenberg scaling can be experimentally achieved in the trapped ion system. Our findings strongly indicate that criticality-enhanced metrology can indeed significantly enhance measurement precisions to a super-Heisenberg scaling when combining a triple point and beneficial parameter modulations, which will be conducive to the exploration of other super-Heisenberg scaling and their applications. © 2024, CC BY-NC-ND.

关键词： Criticality (nuclear fission)

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Mechanoluminescent hybrids from a natural resource for energy-related applications

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InfoMat 2021年第11期3卷 1272-1284页

作者： Chunfeng Wang Ronghua Ma Dengfeng Peng Xianhu Liu Jing Li Boru Jin Aixian Shan Yu Fu Lin Dong Wenchao Gao Zhong Lin Wang Caofeng Pan Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina Key Laboratory of Materials Processing and Mold(Ministry of Education) Henan Key Laboratory of Diamond Optoelectronic Materials and DevicesKey Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhouChina Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijingChina Department of Civil Engineering Monash UniversityClaytonAustralia

Mechanoluminescent(ML)materials that directly convert mechanical energy into photon emission have emerged as promising candidates for various *** the recent advances in the development of both novel and conventional ML materials,the limited access to ML materials that simultaneously have the attributes of high brightness,low cost,self-recovery,and stability,and the lack of appropriate designs for constructing ML devices represent significant challenges that remain to be addressed to boost the practical application of ML ***,ML hybrids derived from a natural source,waste eggshell,with the aforementioned attributes are *** introduction of the eggshell not only enables the preparation of the hybrid in a simple and cost-effective manner but also contributes to the homochromatism(red,green,or blue emission),high brightness,and robustness of the resultant ML *** significant properties of the ML hybrids,together with the proposed structural design,such as porosity or core–shell structure,could expedite a series of mechanic-optical applications,including the self-luminous shoes for the conversion of human motions into light and light generators that efficiently harvest water wave *** fascinating properties,versatile designs,and the efficient protocol of“turning waste into treasure”of the ML hybrids represent significant advances in ML materials,promising a leap to the practical applications of this flouring material family.

关键词： blue energy harvesting eggshell waste mechanoluminescent hybrids smart sensing

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Transient Analysis of Plasma Limiter Using the SETD method with a Multi-Physics Model

Transient Analysis of Plasma Limiter Using the SETD method w...

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IEEE International Wireless Symposium (IWS)

作者： Tong Liu Zhou Dai Haoran Qin Tiancheng Zhang Huaguang Bao Yinghui Zhou Zheng Sun Dazhi Ding School of Microelectronics Nanjing University of Science and Technology Nanjing China Nanjing Electronic Devices Institute Nanjing China National Key Laboratory on Electromagnetic Environmental Effects and Electro-optical Engineering Army Engineering University Nanjing China

The plasma limiter can reflect and absorb the high-power microwave to protect the electronic systems. In this paper, a coupled multi-physics model based on the wave equation and electron hydrodynamic equation is proposed and the response properties of the plasma limiter under high power microwave radiation are analyzed using the spectral element time domain (SETD) method. The superiority of the transient fully coupled analysis under high power microwaves is demonstrated by comparison with COMSOL.

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Arrhythmia classification method based on knowledge distillation and 2D ECG images

Arrhythmia classification method based on knowledge distilla...

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Neural Networks, Information and Communication Engineering (NNICE), International Conference on

作者： Renwei Li Liwei Meng Yian Liu Shaogang Hu Guanchao Qiao School of Software Engineering Chongqing University of Posts and Telecommunications Chongqing China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China Chongqing Institute of Microelectronics Industry Technology University of Electronic Science and Technology of China Chongqing China

Arrhythmia classification is crucial for identifying and preventing the potential risks associated with cardiovascular diseases. Currently., using deep learning for arrhythmia classification faces challenges of model complexity and deployment difficulty. To address this., We present a novel approach for classifying arrhythmias using knowledge distillation and 2D ECG images. In this study., the classification of the MIT-BIH dataset is performed according to AAMI criteria. Preprocessing., such as denoising., interception., and 2D grayscale image conversion., is first performed. Then., high-performance 2D-CNN models are pre-trained using 2D ECG images as the teacher model., and a lightweight 1D-CNN is constructed as the student model. Finally., we align raw and 2D ECG data., utilizing knowledge distillation to allow the student model to learn from the teacher model during the training process., thus enabling model compression. The final results show that the method significantly improves the performance of the student model in arrhythmia classification. For overall performance., when using Vgg16 as the teacher model., Acc and P+ improve by 1.62% and 6.64%., and Se is comparable. In addition., the F1-score values have been improved in all categories. The proposed method provides a feasible approach for low computational power device deployment for arrhythmia classification.

关键词： Knowledge engineering Training Performance evaluation Image coding Arrhythmia Computational modeling Noise reduction

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Recent advances in resistive random access memory based on lead halide perovskite

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InfoMat 2021年第3期3卷 293-315页

作者： Jiayu Di Jianhui Du Zhenhua Lin Shengzhong(Frank)Liu Jianyong Ouyang Jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian UniversityXi'anChina Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi'anChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anChina Department of Materials Science and Engineering National University of SingaporeSingaporeSingapore

Lead halide perovskites have attracted increasing attention in photovoltaic devices,light-emitting diodes,photodetectors,and other fields due to their excellent *** optoelectronic devices,growing numbers of studies have focused on the perovskite-based electrical devices in the past few years,such as transistors and resistive random access memories(RRAMs).Here,this article summarizes the recent progress the researchers have made of RRAM ***,the working mechanism and the key parameters of RRAM are ***,the working principles,including the conductive filament model(containing the types of the model of the metal cationsinduced filament and the model of the ions migration in bulk),the interface effect,and the electronic effect are the origins of the RRAM behaviors,and hence,various factors that affect the device performance are ***,RRAMs based on organolead halide perovskite and all-inorganic perovskite are discussed in terms of different structures,different compositions,and different fabrication ***,a brief conclusion and a broad outlook are given on the progress and challenges in the field of perovskite-based RRAMs.

关键词： all-inorganic perovskites conductive filament models organolead halide perovskites resistive random access memories resistive switching

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