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Passive on-chip isolators based on the thin-film lithium niobate platform

Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang Keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Coexistence of unipolar and bipolar resistive switching in optical synaptic memristors and neuromorphic computing

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Chip 2025年第1期4卷 34-43页

作者： Dongsheng Cui Mengjiao Pei Zhenhua Lin Yifei Wang Hong Zhang Xiangxiang Gao Haidong Yuan Yun Li Jincheng Zhang Yue Hao Jingjing Chang State Key Laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an 710071China National Laboratory of Solid-State Microstructures School of Electronic Science and EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Advanced Interdisciplinary Research Center for Flexible Electronics Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710071China

The human brain possesses a highly developed capability for sensing-memory-computing,and the integration of hardware with brain-like functions represents a novel approach to overcoming the von Neumann *** this study,Ga_(2)O_(3) photoelectric memristors were successfully fabricated,enabling efficient visual information processing and complex recognition through the integration of optoelectronic synapses with digital *** memristors with a Pt/Ga_(2)O_(3)/Pt sandwich structure exhibit the coexistence of unipolar resistive switching(URS)and bipolar resistive switching(BRS),coupled with an impressive switching ratio and stable retention *** device demonstrates robust photo-responsive properties to ultraviolet(UV)light,which enables the realization of an array of 16 photoconductor types through the manipulation of four-timeframe pulse *** of the device to UV light elicits stable synaptic behaviors,including paired-pulse facilitation(PPF),short-term memory(STM),long-term memory(LTM),as well as learning-forgettingrelearning ***,the device exhibits outstanding image sensing,image memory,and neuromorphic visual preprocessing capabilities as a neuromorphic vision sensor(NVS).The integration of light pulse potentiation with electrical pulse depression yields a remarkable 100 conductances with superior *** advanced functionality is further validated by the ability of the device to facilitate the recognition of 85.3%of handwritten digits by artificial neural networks(ANNs),which underscores the significant potential of artificial synapses in mimicking biological neural.

关键词： RRAM URS BRS Optical synapse Neuromorphic computing

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Fermi Rubik's Cube in High-Pressure Induced Chlorine-Rich Compounds

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Chinese Physics Letters 2024年第10期41卷 78-83页

作者： Jun Kong Lei Su Haixu Cui Hairui Ding Jingyu Hou Chunxia Chi Shiyang Liu Xiang-Feng Zhou Hui-Tian Wang Xiao Dong Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071China Center for High Pressure Science and Technology Advanced Research Beijing 100093China Key Laboratory of Photochemistry Institute of ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologySchool of ScienceYanshan UniversityQinhuangdao 066004China National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

In the quasi-free electron model,the Fermi surface spreads into a sphere in the Brillouin zone,i.e.,the Fermi *** Fermi sphere exists widely in metal systems,no matter whether the crystal is in a body-center cubic,face-center cubic,or hexagonal close-packed ***,we report a class of compounds stabilized at high pressure with Rubik’s cubic Fermi surface.

关键词： surface. Fermi cubic

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Phase transformation of two-dimensional nanomaterials: state-of-the-art progress in designing strategies and catalytic applications

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science China Materials 2025年第1期68卷 65-85页

作者： Zeqi Wu Feng Niu Da Chen Yuexiang Huang Guigao Liu Yong Zhou Wenguang Tu Xi Zhu Zhigang Zou College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China School of Science and Engineering The Chinese University of Hong Kong(Shenzhen)Shenzhen 518172China National Special Superfine Powder Engineering Research Center School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjing 210093China

Phase transformation of two-dimensional(2D)nanomaterials can lead to significant changes in electronic and optical properties,which enables the development of novel *** strategies for phase engineering of 2D nanomaterials have drawn considerable attention in recent *** review focuses on the state-of-the-art progress in the phase transformation of 2D nanomaterials and their catalytic ***,the basic concepts of phase transformation and the outstanding electronic and optical properties induced by phase transformation are briefly ***,different strategies for achieving phase transformation are discussed in detail and classified into several types based on their characteristics,including(i)doping,(ii)external fields,(iii)optical irradiation,(iv)strain effect,(v)high-energy particle excitation,and(vi)thermal *** applications of 2D nanomaterials in catalysis based on phase transformation have also been ***,a summary of the technical challenges to phase control in 2D nanomaterials and potential opportunities for developing novel applications is presented.

关键词： phase transformation two-dimensional nanomaterials strategy catalysis application

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Growth and Characterization of a New Superconductor GaBa2Ca3Cu4O11+δ

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Chinese Physics Letters 2023年第1期40卷 60-64页

作者：明学何成平祝熙宇缑慧阳闻海虎 Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of PhysicsNanjing UniversityNanjing 210093China Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing 100094China

We successfully grow a new superconductor GaBa2Ca3Cu4O11+δ(Ga-1234) with a transition temperature of 113 K, using the Walker-type high-pressure synthesis apparatus. X-ray diffraction measurements on the powderized samples show a mixture of the Ga-1234 phase and the Ca0.85CuO2phase, and the former is dominant. Under the scanning electron microscope, plate-like crystals of the Ga-based 1234 phase with shiny surfaces can be *** obtained local chemical compositions revealed by energy dispersion x-ray spectroscopy are very close to the stoichiometric values. On some sub-millimeter crystal-like samples of the 1234 phase, we obtain a full Meissner shielding volume. From the temperature-dependent magnetizations, we determine the irreversibility fields and find that the system exhibits a highly anisotropic behavior.

关键词： Cu4 phase Superconductor

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Overcoming bandwidth limitations in space-coiled acoustic metamaterials through inclined perforated plate design

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Chinese Physics B 2025年第1期34卷 374-379页

作者： Jixin Liu Fengmin Wu Ting Li Junjun Wang Xinye Zou Dong Zhang Department of Applied Physics School of ScienceHarbin University of Science and TechnologyHarbin 150080China Key Laboratory of Modern Acoustics(MOE) Department of PhysicsCollaborative Innovation Center of Advanced MicrostructureNanjing UniversityNanjing 210093China Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

Traditional space-coiled acoustic metamaterials have been widely used in the fields of low-frequency sound absorption and noise ***,they have limitations in terms of low-frequency absorption bandwidth,and the weak coupling effect under complex coiled structures also limits their *** this work,we introduce the composite structure changing the characteristic impedance of acoustic metamaterials to enhance the coupling ***,the perforated plates with inclined design instead of traditional partitions greatly improve the sound *** model and method designed in this paper show significant innovation in enhancing low-frequency absorption performance.

关键词： metamaterials composite structure over-damped modes coupling sound absorption

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A flexible Hf_(0.5)Zr_(0.5)O_(2) thin film with highly robust ferroelectricity

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Journal of Materiomics 2024年第1期10卷 210-217页

作者： Xiang Zhou Haoyang Sun Jiachen Li Xinzhe Du He Wang Zhen Luo Zijian Wang Yue Lin Shengchun Shen Yuewei Yin Xiaoguang Li Hefei National Research Center for Physical Sciences at the Microscale Department of Physicsand CAS Key Laboratory of Strongly-Coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei230026China Collaborative Innovation Center of Advanced Microstructures Nanjing210093China

Flexible hafnia-based ferroelectric memories are arousing much interest with the ever-growing demands for nonvolatile data storage in wearable electronic ***,high-quality flexible Hf_(0.5)Zr_(0.5)O_(2)membranes with robust ferroelectricity were fabricated on inorganic pliable mica substrates via an atomic layer deposition *** flexible Hf_(0.5)Zr_(0.5)O_(2) thin membranes with a thickness of∼8 nm exhibit a high remanent polarization of∼16μC/cm^(2),which possess very robust polarization switching endurance(>10^(10) cycles,two orders of magnitude better than reported flexible HfO_(2)-based films)and superior retention ability(expected>10 years).In particular,stable ferroelectric polarization as well as excellent endurance and retention performance show negligible degradations under 6 mm radius bending conditions or after 10^(4) bending cycles with a 6 mm bending *** results mark a crucial step in the development of flexible hafnium oxide-based ferroelectric memories for wearable electronic devices.

关键词： Ferroelectric polarization Hf_(0.5)Zr_(0.5)O_(2) Flexibility Mica Atomic layer deposition

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Manipulating Hubbard-type Coulomb blockade effect of metallic wires embedded in an insulator

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National science Review 2023年第3期10卷 127-133页

作者： Xing Yang Zhao-Long Gu Huimin Wang Jing-Jing Xian Sheng Meng Naoto Nagaosa Wen-Hao Zhang Hai-Wen Liu Zi-Heng Ling Kai Fan Zhi-Mo Zhang Le Qin Zhi-Hao Zhang Yan Liang Jian-Xin Li Ying-Shuang Fu School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences RIKEN Center for Emergent Matter Science(CEMS) Department of Applied Physics University of Tokyo Center for Advanced Quantum Studies Department of Physics Beijing Normal University Collaborative Innovation Center of Advanced Microstructures Nanjing University Hubei Key Laboratory of Gravitation and Quantum Physics Huazhong University of Science and Technology Wuhan Institute of Quantum Technology

Correlated states have emerged in low-dimensional systems owing to enhanced Coulomb *** these states requires atomic-scale characterization and delicate control ***,spectroscopic imaging-scanning tunneling microscopy was employed to investigate the correlated states residing in 1D electrons of the monolayer and bilayer MoSe2 mirror twin boundary(MTB).The Coulomb energies,determined by the wire length,drive the MTB into two types of ground states with distinct respective out-of-phase and in-phase charge *** two ground states can be reversibly converted through a metastable zero-energy state with in situ voltage pulses,which tune the electron filling of the MTB via a polaronic process,substantiated by first-principles *** Hubbard model calculation with an exact diagonalization method reveals the ground states as correlated insulators from an on-site U-originated Coulomb interaction,dubbed the Hubbard-type Coulomb blockade *** study lays a foundation for understanding and tailoring correlated physics in complex systems.

关键词： STM one-dimensional Coulomb effect electron correlation Hubbard

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Spin freezing induced giant exchange bias in a doped Hund's metal

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science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 167-174页

作者： Shunjiao Li Dan Zhao Jian Li Baolei Kang Min Shan Yanbing Zhou Xuyang Li Tao Wu Xianhui Chen Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Exchange bias(EB)is a fundamental phenomenon in widespread information ***,a comprehensive understanding of its microscopic origin remains a great *** key issue in the debate is the role of frustration and disorder in the EB mechanism,which motivates the exploration of the EB effect in spin glass(SG)***,in the SG state of Crdoped Hund's metal CsFe_(2)As_(2),we discover a giant EB effect with a maximum bias field of -2 T,which is almost two orders of magnitude larger than that of traditional alloy *** results indicate that the giant EB effect should originate from the exchange interactions at the natural boundaries between the tunable ferromagnetic-like(FM)regions around Cr dopants and the SG matrix,via which the FM spins are strongly pinned by the frozen spins in the SG *** addition,the temperaturedependent and cooling-field-dependent EB behaviors could be interpreted well by the SG model with frustrated FM/SG boundaries,which provides an intuitive and explicit understanding of the impact of glassy parameters on the EB *** these results suggest that the correlated metals are promising directions for exploring the EB effect in the SG state.

关键词： Hund's metal spin glass exchange bias iron-based superconductor

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Disentangling the electron-lattice dichotomy of the excitonic insulating phase in Ta_(2)Ni(Se_(1-x)S_(x))_(5) with sulfur substitution and potassium deposition

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science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 119-126页

作者： Tongrui Li Yang Liu Hongen Zhu Haiping Chen Zhanfeng Liu Zhengming Shang Yuliang Li Hui Tian Yunbo Wu Yuhao Hong Haihua Luo Yi Liu Guobin Zhang Lidong Zhang Yuqiao Guo Changzheng Wu Li Song Shengtao Cui Zhe Sun National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei230029China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei230026China School of Mechanics and Optoelectronic Physics Anhui University of Science and TechnologyHuainan232001China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei230026China Collaborative Innovation Center of Advanced Microstructures Nanjing210093China

Ta_(2)NiSe_(5) is a promising candidate for hosting an excitonic insulator(EI)phase,a novel electronic state driven by electron-hole Coulomb ***,the role of electron-lattice coupling in the formation of the EI phase remains ***,we use angle-resolved photoemission spectroscopy(ARPES)to study the band structure evolution of Ta_(2)Ni(Se_(1-x)S_(x))_(5) with sulfur substitution and potassium deposition,which modulate the band gap and the carrier concentration,*** find that the Ta 5d states originating from the bottom of the conduction band persist at the top of the valence band in the low-temperature monoclinic phase,indicating the importance of exciton condensation in opening the gap in the semi-metallic band *** also observe that the characteristic overlap between the conduction and valence bands can be restored in the monoclinic lattice by mild carrier injection,suggesting that the lattice distortion in the monoclinic phase is not the main factor for producing the insulating gap,but rather the exciton condensation in the electronic system is the dominant driving *** results shed light on the electron-lattice decoupling and the origin of the EI phase in Ta_(2)Ni(Se_(1-x)Sx)_(5).

关键词： excitonic insulator angle-resolved photoemission spectroscopy sulfur substitution potassium deposition

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